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K3 Sub-receiver use

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hb9ari@bluewin.ch

K3 Sub-receiver use

Hello,

Before to order a sub-receiver for my K3 (#1212),
i would know if the primary use i've envisaged is possible:

RX/TX on main receiver on 20m for example, with
output power between 5 and 75W (JT65A mainly).
Sometimes, the auto-tuner in the K3 is used.

RX on sub-receiver for 6m on a separated antenna,
(Preampli 6m Elecraft ON or OFF) and IF output to
the (ordered ) P3 for band monitoring.

Thank you for information, because i'm not
clear with hardware and firmware version
necessary for this "dual" band use.

My best 73,
Rudolf, HB9ARI

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Bill VanAlstyne W5WVO

Re: K3 Sub-receiver use

Hi Rudolph,

I am someone who also works 20m JT65A on 14076 and 6 meters, mostly FSK441
meteor scatter and of course SSB/CW sporadic-E when it's happening -- and if
I had a KRX3 second receiver, that's exactly how I would use mine. As far as
I know, that configuration is quite possible. I do also have a DCI 8-pole 6m
bandpass filter inline with my PR6 preamp, which would be protected thereby
from the HF transmit signal field. I don't know if the filter is strictly
necessary while using the K3 to transmit at basically QRP levels of <75W.
But with the DCI filter, it should be no problem for the 6m receive chain.

I'm not going to be in a position any time soon to get the KRX3, but when I
do, that's how I will be using it mostly. I'm looking forward to hearing
confirmation from others that this configuration will work.

Bill W5WVO

PS -- Will be looking for you on 14076 JT65A -- need your country on that
mode/band.

--------------------------------------------------
From: "hb9ari" <[hidden email]>
Sent: Tuesday, May 25, 2010 3:52 AM
To: "Elecraft-forum" <[hidden email]>
Subject: [Elecraft] K3 Sub-receiver use

> Hello,
>
> Before to order a sub-receiver for my K3 (#1212),
> i would know if the primary use i've envisaged is possible:
>
> RX/TX on main receiver on 20m for example, with
> output power between 5 and 75W (JT65A mainly).
> Sometimes, the auto-tuner in the K3 is used.
>
> RX on sub-receiver for 6m on a separated antenna,
> (Preampli 6m Elecraft ON or OFF) and IF output to
> the (ordered ) P3 for band monitoring.
>
> Thank you for information, because i'm not
> clear with hardware and firmware version
> necessary for this "dual" band use.
>
> My best 73,
> Rudolf, HB9ARI
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

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Pete Smith N4ZR

Re: K3 Sub-receiver use

I thought that the sub-RX was muted any time that the transmitter is
active - not so?

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com

On 5/25/2010 8:35 AM, Bill VanAlstyne W5WVO wrote:

> Hi Rudolph,
>
> I am someone who also works 20m JT65A on 14076 and 6 meters, mostly FSK441
> meteor scatter and of course SSB/CW sporadic-E when it's happening -- and if
> I had a KRX3 second receiver, that's exactly how I would use mine. As far as
> I know, that configuration is quite possible. I do also have a DCI 8-pole 6m
> bandpass filter inline with my PR6 preamp, which would be protected thereby
> from the HF transmit signal field. I don't know if the filter is strictly
> necessary while using the K3 to transmit at basically QRP levels of<75W.
> But with the DCI filter, it should be no problem for the 6m receive chain.
>
> I'm not going to be in a position any time soon to get the KRX3, but when I
> do, that's how I will be using it mostly. I'm looking forward to hearing
> confirmation from others that this configuration will work.
>
> Bill W5WVO
>
> PS -- Will be looking for you on 14076 JT65A -- need your country on that
> mode/band.
>
> --------------------------------------------------
> From: "hb9ari"<[hidden email]>
> Sent: Tuesday, May 25, 2010 3:52 AM
> To: "Elecraft-forum"<[hidden email]>
> Subject: [Elecraft] K3 Sub-receiver use
>
>
>> Hello,
>>
>> Before to order a sub-receiver for my K3 (#1212),
>> i would know if the primary use i've envisaged is possible:
>>
>> RX/TX on main receiver on 20m for example, with
>> output power between 5 and 75W (JT65A mainly).
>> Sometimes, the auto-tuner in the K3 is used.
>>
>> RX on sub-receiver for 6m on a separated antenna,
>> (Preampli 6m Elecraft ON or OFF) and IF output to
>> the (ordered ) P3 for band monitoring.
>>
>> Thank you for information, because i'm not
>> clear with hardware and firmware version
>> necessary for this "dual" band use.
>>
>> My best 73,
>> Rudolf, HB9ARI
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Bill VanAlstyne W5WVO

Hi Bill,

Thank you for your reply and info !
Good idea to use filtering on 6m !
For the moment, i was looking
for 6m phone, it's why a "wide"
band survey is useful. But digi
mode can be envisaged.

My best 73,
Rudolf, HB9ARI

PS Hope to meet you for HB9 on 20m JT65A !
During last week-end, i made my
1st QSO with Hawaii (KH6OO)
on 20m JT65A
Ready from my "camping" site(QRZ.com)
from Wednesday evening to
Sunday afternoon.

Bill VanAlstyne W5WVO wrote:

> Hi Rudolph,
>
> I am someone who also works 20m JT65A on 14076 and 6 meters, mostly
> FSK441 meteor scatter and of course SSB/CW sporadic-E when it's
> happening -- and if I had a KRX3 second receiver, that's exactly how I
> would use mine. As far as I know, that configuration is quite
> possible. I do also have a DCI 8-pole 6m bandpass filter inline with
> my PR6 preamp, which would be protected thereby from the HF transmit
> signal field. I don't know if the filter is strictly necessary while
> using the K3 to transmit at basically QRP levels of <75W. But with the
> DCI filter, it should be no problem for the 6m receive chain.
>
> I'm not going to be in a position any time soon to get the KRX3, but
> when I do, that's how I will be using it mostly. I'm looking forward
> to hearing confirmation from others that this configuration will work.
>
> Bill W5WVO
>
> PS -- Will be looking for you on 14076 JT65A -- need your country on
> that mode/band.
>
> --------------------------------------------------
> From: "hb9ari" <[hidden email]>
> Sent: Tuesday, May 25, 2010 3:52 AM
> To: "Elecraft-forum" <[hidden email]>
> Subject: [Elecraft] K3 Sub-receiver use
>
>> Hello,
>>
>> Before to order a sub-receiver for my K3 (#1212),
>> i would know if the primary use i've envisaged is possible:
>>
>> RX/TX on main receiver on 20m for example, with
>> output power between 5 and 75W (JT65A mainly).
>> Sometimes, the auto-tuner in the K3 is used.
>>
>> RX on sub-receiver for 6m on a separated antenna,
>> (Preampli 6m Elecraft ON or OFF) and IF output to
>> the (ordered ) P3 for band monitoring.
>>
>> Thank you for information, because i'm not
>> clear with hardware and firmware version
>> necessary for this "dual" band use.
>>
>> My best 73,
>> Rudolf, HB9ARI
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Pete Smith N4ZR

Hi Pete,

Thank you for your quick reply.
I my case, no problem if SubRcvr
is muted during Main Transmit;
most of time, i'm in RX with JT65A.

My best 73,

Rudolf, HB9ARI

Pete Smith wrote:

> I thought that the sub-RX was muted any time that the transmitter is
> active - not so?
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com
>
>
> On 5/25/2010 8:35 AM, Bill VanAlstyne W5WVO wrote:
>
>> Hi Rudolph,
>>
>> I am someone who also works 20m JT65A on 14076 and 6 meters, mostly FSK441
>> meteor scatter and of course SSB/CW sporadic-E when it's happening -- and if
>> I had a KRX3 second receiver, that's exactly how I would use mine. As far as
>> I know, that configuration is quite possible. I do also have a DCI 8-pole 6m
>> bandpass filter inline with my PR6 preamp, which would be protected thereby
>> from the HF transmit signal field. I don't know if the filter is strictly
>> necessary while using the K3 to transmit at basically QRP levels of<75W.
>> But with the DCI filter, it should be no problem for the 6m receive chain.
>>
>> I'm not going to be in a position any time soon to get the KRX3, but when I
>> do, that's how I will be using it mostly. I'm looking forward to hearing
>> confirmation from others that this configuration will work.
>>
>> Bill W5WVO
>>
>> PS -- Will be looking for you on 14076 JT65A -- need your country on that
>> mode/band.
>>
>> --------------------------------------------------
>> From: "hb9ari"<[hidden email]>
>> Sent: Tuesday, May 25, 2010 3:52 AM
>> To: "Elecraft-forum"<[hidden email]>
>> Subject: [Elecraft] K3 Sub-receiver use
>>
>>
>>
>>> Hello,
>>>
>>> Before to order a sub-receiver for my K3 (#1212),
>>> i would know if the primary use i've envisaged is possible:
>>>
>>> RX/TX on main receiver on 20m for example, with
>>> output power between 5 and 75W (JT65A mainly).
>>> Sometimes, the auto-tuner in the K3 is used.
>>>
>>> RX on sub-receiver for 6m on a separated antenna,
>>> (Preampli 6m Elecraft ON or OFF) and IF output to
>>> the (ordered ) P3 for band monitoring.
>>>
>>> Thank you for information, because i'm not
>>> clear with hardware and firmware version
>>> necessary for this "dual" band use.
>>>
>>> My best 73,
>>> Rudolf, HB9ARI
>>>
>>>
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>>
>>>
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

Richard Ferch

Re: K3 Sub-receiver use

In reply to this post by hb9ari@bluewin.ch

If the P3 gets its signal from the IF out connector on the KXV3 (or
KXV3A), then it will not work with the subRX; the IF out connection from
the KXV3 is from the main receiver only. I seem to recall reading posts
from someone who had done some surgery on his KRX3 in order to create a
similar IF output from the KRX3 for use with an external panadapter, so
it's not beyond the realm of possibility, but you may not be able to do
it with an unmodified K3. I would love to find out that I am wrong on
this, by the way! At any rate, this is a point worth pursuing directly
with Elecraft before laying out cash for a KRX3 and P3 with the
intention of using them together.

73,
Rich VE3KI
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KK7P

Re: K3 Sub-receiver use

> If the P3 gets its signal from the IF out connector on the KXV3 (or
> KXV3A), then it will not work with the subRX; the IF out connection from
> the KXV3 is from the main receiver only.

Correct.

If you decide to bring out an IF signal from the KRX3, keep in mind that
there is 100 dB to 120 dB isolation between the Main and Sub IF signal
chains, and this *must* be preserved to prevent crosstalk between the
receivers.

This really gets nasty if you decide you want to switch between them,
for example. High reverse-isolation buffers may also be required for
such experiments.

73,

Lyle KK7P
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hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by hb9ari@bluewin.ch

Hi Doug,

Thank you for your reply !

As answered to Richard, i've done the bad
choice when ordering a P3!
My "bad" idea was to connect him to
a "future" KRX3 !!
Fortunately it was not too late to
stop my order ! But for the P3...

My best 73,
Rudolf, HB9ARI

Doug Joyce wrote:

> Rudolf: The IF output from the K3 is from the main receiver not the
> sub receiver. If you check back in the archives, there are some
> articles relating to getting an IF sample from the Sub RX.
>
> 73, Doug VE3MV
> K3/100 s/n 2432
>
>
> ----- Original Message ----- From: "hb9ari" <[hidden email]>
> To: "Elecraft-forum" <[hidden email]>
> Sent: Tuesday, May 25, 2010 5:52 AM
> Subject: [Elecraft] K3 Sub-receiver use
>
>
>> Hello,
>>
>> Before to order a sub-receiver for my K3 (#1212),
>> i would know if the primary use i've envisaged is possible:
>>
>> RX/TX on main receiver on 20m for example, with
>> output power between 5 and 75W (JT65A mainly).
>> Sometimes, the auto-tuner in the K3 is used.
>>
>> RX on sub-receiver for 6m on a separated antenna,
>> (Preampli 6m Elecraft ON or OFF) and IF output to
>> the (ordered ) P3 for band monitoring.
>>
>> Thank you for information, because i'm not
>> clear with hardware and firmware version
>> necessary for this "dual" band use.
>>
>> My best 73,
>> Rudolf, HB9ARI
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Richard Ferch

Hi Rich,

Very bad news !

That was my 1st idea when ordering the P3
to use it for "wide" span use for phone mode.
(50Mhz in priority during possible "apertures")
For digi mode, as JT65, the ~2kHz width
of "waterfall" is 100% sufficient, because
frequencies are well defined (for ex 14.076Mhz)
I'm quite sure now that it was a bad idea to have ordered
a P3 but, with your accurate explanation, i will
renounce to the sub-receiver ordering (and
roofing filters)!

I regret that a P3 connection to the sub-rcvr
is not possible, and, as i'm not an RF engineer,
i don't understand the reason(s)!

At my point of vue, it's not 100% correct to say that
the KRX3 is like a 2nd receiver !

Just in time to stop for the KRX3 ordering but for the P3...
may be eBay ?

My best 73,
Rudolf, HB9ARI

Richard Ferch wrote:

> If the P3 gets its signal from the IF out connector on the KXV3 (or
> KXV3A), then it will not work with the subRX; the IF out connection from
> the KXV3 is from the main receiver only. I seem to recall reading posts
> from someone who had done some surgery on his KRX3 in order to create a
> similar IF output from the KRX3 for use with an external panadapter, so
> it's not beyond the realm of possibility, but you may not be able to do
> it with an unmodified K3. I would love to find out that I am wrong on
> this, by the way! At any rate, this is a point worth pursuing directly
> with Elecraft before laying out cash for a KRX3 and P3 with the
> intention of using them together.
>
> 73,
> Rich VE3KI
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

Alan Bloom-2

Re: K3 Sub-receiver use

Hi Rudolf,

At the bottom of this message I will copy a posting from W3SZ on the
LP-PAN email list that describes how he added IF output to his K3
sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
http://www.cliftonlaboratories.com/z10000_buffer_amp.htm

If you don't mind modifying your K3, it looks like that should allow you
to use the sub-receiver with a P3. When I get time I'll have to try it
on my K3 and see how it works.

Alan N1AL

On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:

> Hi Rich,
>
> Very bad news !
>
> That was my 1st idea when ordering the P3
> to use it for "wide" span use for phone mode.
> (50Mhz in priority during possible "apertures")
> For digi mode, as JT65, the ~2kHz width
> of "waterfall" is 100% sufficient, because
> frequencies are well defined (for ex 14.076Mhz)
> I'm quite sure now that it was a bad idea to have ordered
> a P3 but, with your accurate explanation, i will
> renounce to the sub-receiver ordering (and
> roofing filters)!
>
> I regret that a P3 connection to the sub-rcvr
> is not possible, and, as i'm not an RF engineer,
> i don't understand the reason(s)!
>
> At my point of vue, it's not 100% correct to say that
> the KRX3 is like a 2nd receiver !
>
> Just in time to stop for the KRX3 ordering but for the P3...
> may be eBay ?
>
> My best 73,
> Rudolf, HB9ARI

============================================================

-------- Forwarded Message --------
From: w3sz <[hidden email]>
Reply-to: [hidden email]
To: [hidden email]
Cc: [hidden email]
Subject: [LP-PAN] KRX3 IF tap up and running
Date: Fri, 02 Jan 2009 00:56:35 -0500

Hi Larry,

I didn't get a chance to hook up the LP-Pans yet [because the audio
cables I need are up at my hilltop QTH], but I did install the KRX3
and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
subreceiver IF output seem to be working fine. I ran the main IF to
the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
on the Flex5000.

Everything seems to be OK in terms of how I chose to get the IF from the KRX3.

I am working a long day tomorrow as well as Saturday AM, but I am
hoping to get a chance to run up to the hilltop and pick up the audio
cables and then get the LP Pans hooked up Saturday afternoon.

This is a brief summary of what I did with the KRX3:

I used the Z10000 as buffer amp inside the KRX3.

I got +12V from a 12SA pad near to P86A.
Power and RF connections to the Z10000 were done from the underside of
the Z10000.

I took IF output from KRX3 from P86A and used RG174U to take this to
input of Z10000.

I mounted Z10000 on an unused FL position using a 1/2 inch standoff.

I mounted a dual female SMA connector in the REF hole at the bottom
corner of the K3 just below the official IF out BNC. I then used a
right angle premade small surplus coaxial cable to take the signal to
the KRX3 and thus the Z10000.

I entered the KRX3 at the back left corner opposite to J92, because
there was already an opening there.

I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
PCB. I brought it up to the Z10000 by running it through an unused
hole meant for an FL standoff.

At first check, using the two subreceivers on the Flex5000 to receive
the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
outputs seem to be equivalent.

When constructing the Z10000, I used the -U [Universal] options, not
the K2 options. I chose to set it up for zero gain, and thus chose
R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
Z10000 manual.

I attached a jpg file with the two IFs from the K3 going to the Flex
5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
meters.

73,

Roger Rehr
W3SZ
http://www.nitehawk.com/w3sz

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Guy, K2AV

Re: K3 Sub-receiver use

Wouldn't there be a K3 interoperating with P3 firmware issue with
running the P3 on the sub-RX? Just because you could feed a
**stand-alone** box with a non-company mod for sub-RX IF, does not
mean the P3 would change the sub-RX with a click on the P3. There is a
lot of proprietary communication between the K3 and the P3 over the
serial connection.

Wouldn't a sub-RX feed to a P3 need to be specifically supported by
Elecraft firmware, both in K3 and P3? Last remarks from them in this
thread were negative, particularly about isolation at a switch.

That aside, I believe someone using the sub-RX with the TX in split,
while leaving the main RX to feed the P3, would accomplish the same
end. This WOULD be a problem on other rigs where the second RX is an
inferior RX, or not available. In the K3 the sub-RX is a fully equal
clone of the main RX, making various A/B flippity-do tricks possible
without sacrificing performance in any way.

73, Guy.

On Tue, May 25, 2010 at 9:48 PM, Alan Bloom <[hidden email]> wrote:

> Hi Rudolf,
>
> At the bottom of this message I will copy a posting from W3SZ on the
> LP-PAN email list that describes how he added IF output to his K3
> sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
> http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
>
> If you don't mind modifying your K3, it looks like that should allow you
> to use the sub-receiver with a P3. When I get time I'll have to try it
> on my K3 and see how it works.
>
> Alan N1AL
>
>
>
> On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
>> Hi Rich,
>>
>> Very bad news !
>>
>> That was my 1st idea when ordering the P3
>> to use it for "wide" span use for phone mode.
>> (50Mhz in priority during possible "apertures")
>> For digi mode, as JT65, the ~2kHz width
>> of "waterfall" is 100% sufficient, because
>> frequencies are well defined (for ex 14.076Mhz)
>> I'm quite sure now that it was a bad idea to have ordered
>> a P3 but, with your accurate explanation, i will
>> renounce to the sub-receiver ordering (and
>> roofing filters)!
>>
>> I regret that a P3 connection to the sub-rcvr
>> is not possible, and, as i'm not an RF engineer,
>> i don't understand the reason(s)!
>>
>> At my point of vue, it's not 100% correct to say that
>> the KRX3 is like a 2nd receiver !
>>
>> Just in time to stop for the KRX3 ordering but for the P3...
>> may be eBay ?
>>
>> My best 73,
>> Rudolf, HB9ARI
>
> ============================================================
>
> -------- Forwarded Message --------
> From: w3sz <[hidden email]>
> Reply-to: [hidden email]
> To: [hidden email]
> Cc: [hidden email]
> Subject: [LP-PAN] KRX3 IF tap up and running
> Date: Fri, 02 Jan 2009 00:56:35 -0500
>
> Hi Larry,
>
> I didn't get a chance to hook up the LP-Pans yet [because the audio
> cables I need are up at my hilltop QTH], but I did install the KRX3
> and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
> subreceiver IF output seem to be working fine. I ran the main IF to
> the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
> on the Flex5000.
>
> Everything seems to be OK in terms of how I chose to get the IF from the KRX3.
>
> I am working a long day tomorrow as well as Saturday AM, but I am
> hoping to get a chance to run up to the hilltop and pick up the audio
> cables and then get the LP Pans hooked up Saturday afternoon.
>
> This is a brief summary of what I did with the KRX3:
>
> I used the Z10000 as buffer amp inside the KRX3.
>
> I got +12V from a 12SA pad near to P86A.
> Power and RF connections to the Z10000 were done from the underside of
> the Z10000.
>
> I took IF output from KRX3 from P86A and used RG174U to take this to
> input of Z10000.
>
> I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
>
> I mounted a dual female SMA connector in the REF hole at the bottom
> corner of the K3 just below the official IF out BNC. I then used a
> right angle premade small surplus coaxial cable to take the signal to
> the KRX3 and thus the Z10000.
>
> I entered the KRX3 at the back left corner opposite to J92, because
> there was already an opening there.
>
> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
> PCB. I brought it up to the Z10000 by running it through an unused
> hole meant for an FL standoff.
>
> At first check, using the two subreceivers on the Flex5000 to receive
> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
> outputs seem to be equivalent.
>
> When constructing the Z10000, I used the -U [Universal] options, not
> the K2 options. I chose to set it up for zero gain, and thus chose
> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
> Z10000 manual.
>
> I attached a jpg file with the two IFs from the K3 going to the Flex
> 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
> IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
> meters.
>
> 73,
>
> Roger Rehr
> W3SZ
> http://www.nitehawk.com/w3sz
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Alan Bloom-2

Re: K3 Sub-receiver use

Yes, the P3 assumes it is connected to the main receiver's IF output, so
if it is actually connected to the sub-RX it would still work but would
not display the correct frequencies and levels. If this becomes popular
enough maybe we should think about adding sub-RX support to P3 firmware.

Alan N1AL

On Tue, 2010-05-25 at 23:50 -0400, Guy Olinger K2AV wrote:

> Wouldn't there be a K3 interoperating with P3 firmware issue with
> running the P3 on the sub-RX? Just because you could feed a
> **stand-alone** box with a non-company mod for sub-RX IF, does not
> mean the P3 would change the sub-RX with a click on the P3. There is a
> lot of proprietary communication between the K3 and the P3 over the
> serial connection.
>
> Wouldn't a sub-RX feed to a P3 need to be specifically supported by
> Elecraft firmware, both in K3 and P3? Last remarks from them in this
> thread were negative, particularly about isolation at a switch.
>
> That aside, I believe someone using the sub-RX with the TX in split,
> while leaving the main RX to feed the P3, would accomplish the same
> end. This WOULD be a problem on other rigs where the second RX is an
> inferior RX, or not available. In the K3 the sub-RX is a fully equal
> clone of the main RX, making various A/B flippity-do tricks possible
> without sacrificing performance in any way.
>
> 73, Guy.
>
> On Tue, May 25, 2010 at 9:48 PM, Alan Bloom <[hidden email]> wrote:
> > Hi Rudolf,
> >
> > At the bottom of this message I will copy a posting from W3SZ on the
> > LP-PAN email list that describes how he added IF output to his K3
> > sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
> > http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
> >
> > If you don't mind modifying your K3, it looks like that should allow you
> > to use the sub-receiver with a P3. When I get time I'll have to try it
> > on my K3 and see how it works.
> >
> > Alan N1AL
> >
> >
> >
> > On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
> >> Hi Rich,
> >>
> >> Very bad news !
> >>
> >> That was my 1st idea when ordering the P3
> >> to use it for "wide" span use for phone mode.
> >> (50Mhz in priority during possible "apertures")
> >> For digi mode, as JT65, the ~2kHz width
> >> of "waterfall" is 100% sufficient, because
> >> frequencies are well defined (for ex 14.076Mhz)
> >> I'm quite sure now that it was a bad idea to have ordered
> >> a P3 but, with your accurate explanation, i will
> >> renounce to the sub-receiver ordering (and
> >> roofing filters)!
> >>
> >> I regret that a P3 connection to the sub-rcvr
> >> is not possible, and, as i'm not an RF engineer,
> >> i don't understand the reason(s)!
> >>
> >> At my point of vue, it's not 100% correct to say that
> >> the KRX3 is like a 2nd receiver !
> >>
> >> Just in time to stop for the KRX3 ordering but for the P3...
> >> may be eBay ?
> >>
> >> My best 73,
> >> Rudolf, HB9ARI
> >
> > ============================================================
> >
> > -------- Forwarded Message --------
> > From: w3sz <[hidden email]>
> > Reply-to: [hidden email]
> > To: [hidden email]
> > Cc: [hidden email]
> > Subject: [LP-PAN] KRX3 IF tap up and running
> > Date: Fri, 02 Jan 2009 00:56:35 -0500
> >
> > Hi Larry,
> >
> > I didn't get a chance to hook up the LP-Pans yet [because the audio
> > cables I need are up at my hilltop QTH], but I did install the KRX3
> > and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
> > subreceiver IF output seem to be working fine. I ran the main IF to
> > the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
> > on the Flex5000.
> >
> > Everything seems to be OK in terms of how I chose to get the IF from the KRX3.
> >
> > I am working a long day tomorrow as well as Saturday AM, but I am
> > hoping to get a chance to run up to the hilltop and pick up the audio
> > cables and then get the LP Pans hooked up Saturday afternoon.
> >
> > This is a brief summary of what I did with the KRX3:
> >
> > I used the Z10000 as buffer amp inside the KRX3.
> >
> > I got +12V from a 12SA pad near to P86A.
> > Power and RF connections to the Z10000 were done from the underside of
> > the Z10000.
> >
> > I took IF output from KRX3 from P86A and used RG174U to take this to
> > input of Z10000.
> >
> > I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
> >
> > I mounted a dual female SMA connector in the REF hole at the bottom
> > corner of the K3 just below the official IF out BNC. I then used a
> > right angle premade small surplus coaxial cable to take the signal to
> > the KRX3 and thus the Z10000.
> >
> > I entered the KRX3 at the back left corner opposite to J92, because
> > there was already an opening there.
> >
> > I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
> > PCB. I brought it up to the Z10000 by running it through an unused
> > hole meant for an FL standoff.
> >
> > At first check, using the two subreceivers on the Flex5000 to receive
> > the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
> > outputs seem to be equivalent.
> >
> > When constructing the Z10000, I used the -U [Universal] options, not
> > the K2 options. I chose to set it up for zero gain, and thus chose
> > R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
> > Z10000 manual.
> >
> > I attached a jpg file with the two IFs from the K3 going to the Flex
> > 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
> > IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
> > meters.
> >
> > 73,
> >
> > Roger Rehr
> > W3SZ
> > http://www.nitehawk.com/w3sz
> >
> >
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by hb9ari@bluewin.ch

Hi Steve,

A lot of money hi !
As the P3's IF should be software
defined, i could use it with an other
rig, where an IF output is installed or
a modification easily feasible.
I've connected the PR6 on my K3,
and RX have done some comparisons
with my "old" FT857 WITHOUT preamp
sharing the same antenna and including
the splitter losses; results are not so good...
On all other bands, i'm 100%
satisfied with my K3 (#1212)
and would never change!
I will look for a 6/2/0.7m TXRX
may be with a pre-installed IF
compatible with the P3.

73 QRO,
Rudolf, HB9ARI

S Sacco wrote:

> Rudolph -
>
> The P3 is not yet shipping; you should easily be able to cancel your
> order for it....unless you bought ANOTHER K3, and used that only for
> 6M! Then you could use the P3 with that rig!
>
>
> 73,
> Steve
> NN4X
>
> On Tue, May 25, 2010 at 4:01 PM, hb9ari <[hidden email]> wrote:
>
>> Hi Rich,
>>
>> Very bad news !
>>
>> That was my 1st idea when ordering the P3
>> to use it for "wide" span use for phone mode.
>> (50Mhz in priority during possible "apertures")
>> For digi mode, as JT65, the ~2kHz width
>> of "waterfall" is 100% sufficient, because
>> frequencies are well defined (for ex 14.076Mhz)
>> I'm quite sure now that it was a bad idea to have ordered
>> a P3 but, with your accurate explanation, i will
>> renounce to the sub-receiver ordering (and
>> roofing filters)!
>>
>> I regret that a P3 connection to the sub-rcvr
>> is not possible, and, as i'm not an RF engineer,
>> i don't understand the reason(s)!
>>
>> At my point of vue, it's not 100% correct to say that
>> the KRX3 is like a 2nd receiver !
>>
>> Just in time to stop for the KRX3 ordering but for the P3...
>> may be eBay ?
>>
>> My best 73,
>> Rudolf, HB9ARI
>>
>> Richard Ferch wrote:
>>
>>> If the P3 gets its signal from the IF out connector on the KXV3 (or
>>> KXV3A), then it will not work with the subRX; the IF out connection from
>>> the KXV3 is from the main receiver only. I seem to recall reading posts
>>> from someone who had done some surgery on his KRX3 in order to create a
>>> similar IF output from the KRX3 for use with an external panadapter, so
>>> it's not beyond the realm of possibility, but you may not be able to do
>>> it with an unmodified K3. I would love to find out that I am wrong on
>>> this, by the way! At any rate, this is a point worth pursuing directly
>>> with Elecraft before laying out cash for a KRX3 and P3 with the
>>> intention of using them together.
>>>
>>> 73,
>>> Rich VE3KI
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>>
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by hb9ari@bluewin.ch

Hi Mike,

Same answer as for Steve,
as IF input of P3 should be
software defined, i could
use it with a dedicated 6m rig.

73 QRO,
Rudolf, HB9ARI

K2MK wrote:
> Hi Rudolf:
>
> You should be able to stop the P3. They are not starting shipments of
> the P3 until 15 July.
>
> 73,
> Mike K2MK
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Brett Howard

Re: K3 Sub-receiver use

In reply to this post by Alan Bloom-2

Can the P3 at least show where the sub RX is and its BW and what not if
its on the same screen full of where the Main RX is?

~Brett

On Tue, 2010-05-25 at 21:25 -0700, Alan Bloom wrote:

> Yes, the P3 assumes it is connected to the main receiver's IF output, so
> if it is actually connected to the sub-RX it would still work but would
> not display the correct frequencies and levels. If this becomes popular
> enough maybe we should think about adding sub-RX support to P3 firmware.
>
> Alan N1AL
>
>
> On Tue, 2010-05-25 at 23:50 -0400, Guy Olinger K2AV wrote:
> > Wouldn't there be a K3 interoperating with P3 firmware issue with
> > running the P3 on the sub-RX? Just because you could feed a
> > **stand-alone** box with a non-company mod for sub-RX IF, does not
> > mean the P3 would change the sub-RX with a click on the P3. There is a
> > lot of proprietary communication between the K3 and the P3 over the
> > serial connection.
> >
> > Wouldn't a sub-RX feed to a P3 need to be specifically supported by
> > Elecraft firmware, both in K3 and P3? Last remarks from them in this
> > thread were negative, particularly about isolation at a switch.
> >
> > That aside, I believe someone using the sub-RX with the TX in split,
> > while leaving the main RX to feed the P3, would accomplish the same
> > end. This WOULD be a problem on other rigs where the second RX is an
> > inferior RX, or not available. In the K3 the sub-RX is a fully equal
> > clone of the main RX, making various A/B flippity-do tricks possible
> > without sacrificing performance in any way.
> >
> > 73, Guy.
> >
> > On Tue, May 25, 2010 at 9:48 PM, Alan Bloom <[hidden email]> wrote:
> > > Hi Rudolf,
> > >
> > > At the bottom of this message I will copy a posting from W3SZ on the
> > > LP-PAN email list that describes how he added IF output to his K3
> > > sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
> > > http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
> > >
> > > If you don't mind modifying your K3, it looks like that should allow you
> > > to use the sub-receiver with a P3. When I get time I'll have to try it
> > > on my K3 and see how it works.
> > >
> > > Alan N1AL
> > >
> > >
> > >
> > > On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
> > >> Hi Rich,
> > >>
> > >> Very bad news !
> > >>
> > >> That was my 1st idea when ordering the P3
> > >> to use it for "wide" span use for phone mode.
> > >> (50Mhz in priority during possible "apertures")
> > >> For digi mode, as JT65, the ~2kHz width
> > >> of "waterfall" is 100% sufficient, because
> > >> frequencies are well defined (for ex 14.076Mhz)
> > >> I'm quite sure now that it was a bad idea to have ordered
> > >> a P3 but, with your accurate explanation, i will
> > >> renounce to the sub-receiver ordering (and
> > >> roofing filters)!
> > >>
> > >> I regret that a P3 connection to the sub-rcvr
> > >> is not possible, and, as i'm not an RF engineer,
> > >> i don't understand the reason(s)!
> > >>
> > >> At my point of vue, it's not 100% correct to say that
> > >> the KRX3 is like a 2nd receiver !
> > >>
> > >> Just in time to stop for the KRX3 ordering but for the P3...
> > >> may be eBay ?
> > >>
> > >> My best 73,
> > >> Rudolf, HB9ARI
> > >
> > > ============================================================
> > >
> > > -------- Forwarded Message --------
> > > From: w3sz <[hidden email]>
> > > Reply-to: [hidden email]
> > > To: [hidden email]
> > > Cc: [hidden email]
> > > Subject: [LP-PAN] KRX3 IF tap up and running
> > > Date: Fri, 02 Jan 2009 00:56:35 -0500
> > >
> > > Hi Larry,
> > >
> > > I didn't get a chance to hook up the LP-Pans yet [because the audio
> > > cables I need are up at my hilltop QTH], but I did install the KRX3
> > > and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
> > > subreceiver IF output seem to be working fine. I ran the main IF to
> > > the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
> > > on the Flex5000.
> > >
> > > Everything seems to be OK in terms of how I chose to get the IF from the KRX3.
> > >
> > > I am working a long day tomorrow as well as Saturday AM, but I am
> > > hoping to get a chance to run up to the hilltop and pick up the audio
> > > cables and then get the LP Pans hooked up Saturday afternoon.
> > >
> > > This is a brief summary of what I did with the KRX3:
> > >
> > > I used the Z10000 as buffer amp inside the KRX3.
> > >
> > > I got +12V from a 12SA pad near to P86A.
> > > Power and RF connections to the Z10000 were done from the underside of
> > > the Z10000.
> > >
> > > I took IF output from KRX3 from P86A and used RG174U to take this to
> > > input of Z10000.
> > >
> > > I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
> > >
> > > I mounted a dual female SMA connector in the REF hole at the bottom
> > > corner of the K3 just below the official IF out BNC. I then used a
> > > right angle premade small surplus coaxial cable to take the signal to
> > > the KRX3 and thus the Z10000.
> > >
> > > I entered the KRX3 at the back left corner opposite to J92, because
> > > there was already an opening there.
> > >
> > > I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
> > > PCB. I brought it up to the Z10000 by running it through an unused
> > > hole meant for an FL standoff.
> > >
> > > At first check, using the two subreceivers on the Flex5000 to receive
> > > the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
> > > outputs seem to be equivalent.
> > >
> > > When constructing the Z10000, I used the -U [Universal] options, not
> > > the K2 options. I chose to set it up for zero gain, and thus chose
> > > R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
> > > Z10000 manual.
> > >
> > > I attached a jpg file with the two IFs from the K3 going to the Flex
> > > 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
> > > IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
> > > meters.
> > >
> > > 73,
> > >
> > > Roger Rehr
> > > W3SZ
> > > http://www.nitehawk.com/w3sz
> > >
> > >
> > >
> > > ______________________________________________________________
> > > Elecraft mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:[hidden email]
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Alan Bloom-2

Hi Alan,

If modifications are not too "heavy", it's
not a problem; but i don't like to take the risk
of performances degradation of the "initial" configuration.

That's the reason the 1st time i've opened
my K3 was for recent 8poles filter installation
and removing of original 2k7 5poles.
No risk for performance degradation!

For the 6m occasional phone use during
"apertures" i would not get lower perf on
other bands, used over 95% of time,
and where i'm totally satisfied.

Nevertheless, i will read the informations
you have communicated with great interest.

In any case, as the IF input frequency is SW defined,
i can use the ordered P3 with an other rig
(with compatible IF output or "modified").

To conclude this thread, i must admit
that MY error was to think that IF output
(for the P3 in this case) was selectable
between 2 "identical" receivers Main and Sub

Should have read better the docs and related infos!

My best 73,

Rudolf, HB9ARI

PS It's not my "habit" to cancel an order
(when it's possible) when i do a bad choice!
I assume! In this case, the P3 is not
a "bad" choice but i will use it in a different
manner, until a "supported" modification?

Alan Bloom wrote:

> Hi Rudolf,
>
> At the bottom of this message I will copy a posting from W3SZ on the
> LP-PAN email list that describes how he added IF output to his K3
> sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
> http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
>
> If you don't mind modifying your K3, it looks like that should allow you
> to use the sub-receiver with a P3. When I get time I'll have to try it
> on my K3 and see how it works.
>
> Alan N1AL
>
>
>
> On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
>
>> Hi Rich,
>>
>> Very bad news !
>>
>> That was my 1st idea when ordering the P3
>> to use it for "wide" span use for phone mode.
>> (50Mhz in priority during possible "apertures")
>> For digi mode, as JT65, the ~2kHz width
>> of "waterfall" is 100% sufficient, because
>> frequencies are well defined (for ex 14.076Mhz)
>> I'm quite sure now that it was a bad idea to have ordered
>> a P3 but, with your accurate explanation, i will
>> renounce to the sub-receiver ordering (and
>> roofing filters)!
>>
>> I regret that a P3 connection to the sub-rcvr
>> is not possible, and, as i'm not an RF engineer,
>> i don't understand the reason(s)!
>>
>> At my point of vue, it's not 100% correct to say that
>> the KRX3 is like a 2nd receiver !
>>
>> Just in time to stop for the KRX3 ordering but for the P3...
>> may be eBay ?
>>
>> My best 73,
>> Rudolf, HB9ARI
>>
>
> ============================================================
>
> -------- Forwarded Message --------
> From: w3sz <[hidden email]>
> Reply-to: [hidden email]
> To: [hidden email]
> Cc: [hidden email]
> Subject: [LP-PAN] KRX3 IF tap up and running
> Date: Fri, 02 Jan 2009 00:56:35 -0500
>
> Hi Larry,
>
> I didn't get a chance to hook up the LP-Pans yet [because the audio
> cables I need are up at my hilltop QTH], but I did install the KRX3
> and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
> subreceiver IF output seem to be working fine. I ran the main IF to
> the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
> on the Flex5000.
>
> Everything seems to be OK in terms of how I chose to get the IF from the KRX3.
>
> I am working a long day tomorrow as well as Saturday AM, but I am
> hoping to get a chance to run up to the hilltop and pick up the audio
> cables and then get the LP Pans hooked up Saturday afternoon.
>
> This is a brief summary of what I did with the KRX3:
>
> I used the Z10000 as buffer amp inside the KRX3.
>
> I got +12V from a 12SA pad near to P86A.
> Power and RF connections to the Z10000 were done from the underside of
> the Z10000.
>
> I took IF output from KRX3 from P86A and used RG174U to take this to
> input of Z10000.
>
> I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
>
> I mounted a dual female SMA connector in the REF hole at the bottom
> corner of the K3 just below the official IF out BNC. I then used a
> right angle premade small surplus coaxial cable to take the signal to
> the KRX3 and thus the Z10000.
>
> I entered the KRX3 at the back left corner opposite to J92, because
> there was already an opening there.
>
> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
> PCB. I brought it up to the Z10000 by running it through an unused
> hole meant for an FL standoff.
>
> At first check, using the two subreceivers on the Flex5000 to receive
> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
> outputs seem to be equivalent.
>
> When constructing the Z10000, I used the -U [Universal] options, not
> the K2 options. I chose to set it up for zero gain, and thus chose
> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
> Z10000 manual.
>
> I attached a jpg file with the two IFs from the K3 going to the Flex
> 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
> IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
> meters.
>
> 73,
>
> Roger Rehr
> W3SZ
> http://www.nitehawk.com/w3sz
>
>
>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Alan Bloom-2

Hi Mark,

A very good new !

As answered to Alan, i will read these info and
a great attention to your uploaded notes!

Many thanks for sharing your experiences !

If there are no performances degradation on
the main rcvr (IF feed trough, etc) i'm ready
to envisage the "jump" !

73 QRO
Rudolf, HB9ARI

Mark n2qt wrote:

> Rudolf,
>
> I used the info provided by W3SZ successfully and uploaded pictures
> and notes to
> the files section that may help you plan the modifications.
> http://groups.yahoo.com/group/Elecraft_K3/files/KRX3_IF_Out/addSubRX_IF.txt
>
>
> It works well!
>
> Mark n2qt
>
>
> ----- Original Message ----- From: "Alan Bloom" <[hidden email]>
> To: "hb9ari" <[hidden email]>
> Cc: "Elecraft-forum" <[hidden email]>
> Sent: Tuesday, May 25, 2010 9:48 PM
> Subject: Re: [Elecraft] K3 Sub-receiver use
>
>
>> Hi Rudolf,
>>
>> At the bottom of this message I will copy a posting from W3SZ on the
>> LP-PAN email list that describes how he added IF output to his K3
>> sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
>> http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
>>
>> If you don't mind modifying your K3, it looks like that should allow you
>> to use the sub-receiver with a P3. When I get time I'll have to try it
>> on my K3 and see how it works.
>>
>> Alan N1AL
>>
>>
>>
>> On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
>>> Hi Rich,
>>>
>>> Very bad news !
>>>
>>> That was my 1st idea when ordering the P3
>>> to use it for "wide" span use for phone mode.
>>> (50Mhz in priority during possible "apertures")
>>> For digi mode, as JT65, the ~2kHz width
>>> of "waterfall" is 100% sufficient, because
>>> frequencies are well defined (for ex 14.076Mhz)
>>> I'm quite sure now that it was a bad idea to have ordered
>>> a P3 but, with your accurate explanation, i will
>>> renounce to the sub-receiver ordering (and
>>> roofing filters)!
>>>
>>> I regret that a P3 connection to the sub-rcvr
>>> is not possible, and, as i'm not an RF engineer,
>>> i don't understand the reason(s)!
>>>
>>> At my point of vue, it's not 100% correct to say that
>>> the KRX3 is like a 2nd receiver !
>>>
>>> Just in time to stop for the KRX3 ordering but for the P3...
>>> may be eBay ?
>>>
>>> My best 73,
>>> Rudolf, HB9ARI
>>
>> ============================================================
>>
>> -------- Forwarded Message --------
>> From: w3sz <[hidden email]>
>> Reply-to: [hidden email]
>> To: [hidden email]
>> Cc: [hidden email]
>> Subject: [LP-PAN] KRX3 IF tap up and running
>> Date: Fri, 02 Jan 2009 00:56:35 -0500
>>
>> Hi Larry,
>>
>> I didn't get a chance to hook up the LP-Pans yet [because the audio
>> cables I need are up at my hilltop QTH], but I did install the KRX3
>> and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
>> subreceiver IF output seem to be working fine. I ran the main IF to
>> the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
>> on the Flex5000.
>>
>> Everything seems to be OK in terms of how I chose to get the IF from
>> the KRX3.
>>
>> I am working a long day tomorrow as well as Saturday AM, but I am
>> hoping to get a chance to run up to the hilltop and pick up the audio
>> cables and then get the LP Pans hooked up Saturday afternoon.
>>
>> This is a brief summary of what I did with the KRX3:
>>
>> I used the Z10000 as buffer amp inside the KRX3.
>>
>> I got +12V from a 12SA pad near to P86A.
>> Power and RF connections to the Z10000 were done from the underside of
>> the Z10000.
>>
>> I took IF output from KRX3 from P86A and used RG174U to take this to
>> input of Z10000.
>>
>> I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
>>
>> I mounted a dual female SMA connector in the REF hole at the bottom
>> corner of the K3 just below the official IF out BNC. I then used a
>> right angle premade small surplus coaxial cable to take the signal to
>> the KRX3 and thus the Z10000.
>>
>> I entered the KRX3 at the back left corner opposite to J92, because
>> there was already an opening there.
>>
>> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
>> PCB. I brought it up to the Z10000 by running it through an unused
>> hole meant for an FL standoff.
>>
>> At first check, using the two subreceivers on the Flex5000 to receive
>> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
>> outputs seem to be equivalent.
>>
>> When constructing the Z10000, I used the -U [Universal] options, not
>> the K2 options. I chose to set it up for zero gain, and thus chose
>> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
>> Z10000 manual.
>>
>> I attached a jpg file with the two IFs from the K3 going to the Flex
>> 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
>> IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
>> meters.
>>
>> 73,
>>
>> Roger Rehr
>> W3SZ
>> http://www.nitehawk.com/w3sz
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>

hb9ari@bluewin.ch

Re: K3 Sub-receiver use

In reply to this post by Alan Bloom-2

Hi Alan,

No more a "dream" for me !
If i dare, you can put me on the list!

73 QRO,
Rudolf, HB9ARI

PS Excuse me for my bad mood !
I "love" too much MY K3...

Alan Bloom wrote:

> Yes, the P3 assumes it is connected to the main receiver's IF output, so
> if it is actually connected to the sub-RX it would still work but would
> not display the correct frequencies and levels. If this becomes popular
> enough maybe we should think about adding sub-RX support to P3 firmware.
>
> Alan N1AL
>
>
> On Tue, 2010-05-25 at 23:50 -0400, Guy Olinger K2AV wrote:
>
>> Wouldn't there be a K3 interoperating with P3 firmware issue with
>> running the P3 on the sub-RX? Just because you could feed a
>> **stand-alone** box with a non-company mod for sub-RX IF, does not
>> mean the P3 would change the sub-RX with a click on the P3. There is a
>> lot of proprietary communication between the K3 and the P3 over the
>> serial connection.
>>
>> Wouldn't a sub-RX feed to a P3 need to be specifically supported by
>> Elecraft firmware, both in K3 and P3? Last remarks from them in this
>> thread were negative, particularly about isolation at a switch.
>>
>> That aside, I believe someone using the sub-RX with the TX in split,
>> while leaving the main RX to feed the P3, would accomplish the same
>> end. This WOULD be a problem on other rigs where the second RX is an
>> inferior RX, or not available. In the K3 the sub-RX is a fully equal
>> clone of the main RX, making various A/B flippity-do tricks possible
>> without sacrificing performance in any way.
>>
>> 73, Guy.
>>
>> On Tue, May 25, 2010 at 9:48 PM, Alan Bloom <[hidden email]> wrote:
>>
>>> Hi Rudolf,
>>>
>>> At the bottom of this message I will copy a posting from W3SZ on the
>>> LP-PAN email list that describes how he added IF output to his K3
>>> sub-receiver. He used the Z10000 buffer amp from Clifton Labs:
>>> http://www.cliftonlaboratories.com/z10000_buffer_amp.htm
>>>
>>> If you don't mind modifying your K3, it looks like that should allow you
>>> to use the sub-receiver with a P3. When I get time I'll have to try it
>>> on my K3 and see how it works.
>>>
>>> Alan N1AL
>>>
>>>
>>>
>>> On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote:
>>>
>>>> Hi Rich,
>>>>
>>>> Very bad news !
>>>>
>>>> That was my 1st idea when ordering the P3
>>>> to use it for "wide" span use for phone mode.
>>>> (50Mhz in priority during possible "apertures")
>>>> For digi mode, as JT65, the ~2kHz width
>>>> of "waterfall" is 100% sufficient, because
>>>> frequencies are well defined (for ex 14.076Mhz)
>>>> I'm quite sure now that it was a bad idea to have ordered
>>>> a P3 but, with your accurate explanation, i will
>>>> renounce to the sub-receiver ordering (and
>>>> roofing filters)!
>>>>
>>>> I regret that a P3 connection to the sub-rcvr
>>>> is not possible, and, as i'm not an RF engineer,
>>>> i don't understand the reason(s)!
>>>>
>>>> At my point of vue, it's not 100% correct to say that
>>>> the KRX3 is like a 2nd receiver !
>>>>
>>>> Just in time to stop for the KRX3 ordering but for the P3...
>>>> may be eBay ?
>>>>
>>>> My best 73,
>>>> Rudolf, HB9ARI
>>>>
>>> ============================================================
>>>
>>> -------- Forwarded Message --------
>>> From: w3sz <[hidden email]>
>>> Reply-to: [hidden email]
>>> To: [hidden email]
>>> Cc: [hidden email]
>>> Subject: [LP-PAN] KRX3 IF tap up and running
>>> Date: Fri, 02 Jan 2009 00:56:35 -0500
>>>
>>> Hi Larry,
>>>
>>> I didn't get a chance to hook up the LP-Pans yet [because the audio
>>> cables I need are up at my hilltop QTH], but I did install the KRX3
>>> and its Z10000 buffer amp, and both the main K3 IF output and the KRX3
>>> subreceiver IF output seem to be working fine. I ran the main IF to
>>> the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver
>>> on the Flex5000.
>>>
>>> Everything seems to be OK in terms of how I chose to get the IF from the KRX3.
>>>
>>> I am working a long day tomorrow as well as Saturday AM, but I am
>>> hoping to get a chance to run up to the hilltop and pick up the audio
>>> cables and then get the LP Pans hooked up Saturday afternoon.
>>>
>>> This is a brief summary of what I did with the KRX3:
>>>
>>> I used the Z10000 as buffer amp inside the KRX3.
>>>
>>> I got +12V from a 12SA pad near to P86A.
>>> Power and RF connections to the Z10000 were done from the underside of
>>> the Z10000.
>>>
>>> I took IF output from KRX3 from P86A and used RG174U to take this to
>>> input of Z10000.
>>>
>>> I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
>>>
>>> I mounted a dual female SMA connector in the REF hole at the bottom
>>> corner of the K3 just below the official IF out BNC. I then used a
>>> right angle premade small surplus coaxial cable to take the signal to
>>> the KRX3 and thus the Z10000.
>>>
>>> I entered the KRX3 at the back left corner opposite to J92, because
>>> there was already an opening there.
>>>
>>> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
>>> PCB. I brought it up to the Z10000 by running it through an unused
>>> hole meant for an FL standoff.
>>>
>>> At first check, using the two subreceivers on the Flex5000 to receive
>>> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
>>> outputs seem to be equivalent.
>>>
>>> When constructing the Z10000, I used the -U [Universal] options, not
>>> the K2 options. I chose to set it up for zero gain, and thus chose
>>> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
>>> Z10000 manual.
>>>
>>> I attached a jpg file with the two IFs from the K3 going to the Flex
>>> 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub
>>> IF goes to the Flex sub receiver. The signal is Radio Moscow on 40
>>> meters.
>>>
>>> 73,
>>>
>>> Roger Rehr
>>> W3SZ
>>> http://www.nitehawk.com/w3sz
>>>
>>>
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>>
>
>
>
>

Ken Kopp-3

P3 IF frequency

In reply to this post by hb9ari@bluewin.ch

The P3 IF input -is- user-defined and can be between
455 kHz and 21.7 mHz. The full specs of the P3 are
on the Elecraft website.

73! Ken Kopp - K0PP
[hidden email]

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html

hb9ari@bluewin.ch

Re: P3 IF frequency

Hi Ken

rr !

I was not 100% sure !

But if modification is feasible,
P3 will be better at K3's side!

73 QRO,
Rudolf, HB9ARI

Ken Kopp wrote:

> The P3 IF input -is- user-defined and can be between
> 455 kHz and 21.7 mHz. The full specs of the P3 are
> on the Elecraft website.
>
> 73! Ken Kopp - K0PP
> [hidden email]
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>