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K3 question re dual receive

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Bill W4ZV

K3 question re dual receive

N6KR:
>The KRX3 subreceiver can either share the main receiver's RF
path or get its signal from the unused KAT3 ATU antenna jack.

Can't we use the RX antenna port on the $79 KXV3? This
is how I plan to use diversity. One input being my
directional TX antenna and the other being a Beverage
on the KXV3 RX antenna input. This is a less expensive
alternative for a second antenna input if you have no
need for the $289 KAT3, as is my case. If I'm wrong,
I need to cancel my KXV3 and order a KAT3.

73, Bill W4ZV

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Dick, K2ZR

Re: K3 question re dual receive

What protects the KRX3 sub-receiver from RF overload when it gets its
signal from the unused KATS ATU antenna jack?
73, Dick K2ZR

Bill Tippett wrote:

>
>
> N6KR:
> >The KRX3 subreceiver can either share the main receiver's RF
> path or get its signal from the unused KAT3 ATU antenna jack.
>
> Can't we use the RX antenna port on the $79 KXV3? This
> is how I plan to use diversity. One input being my
> directional TX antenna and the other being a Beverage
> on the KXV3 RX antenna input. This is a less expensive
> alternative for a second antenna input if you have no
> need for the $289 KAT3, as is my case. If I'm wrong,
> I need to cancel my KXV3 and order a KAT3.
>
> 73, Bill W4ZV
>
>
>
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>

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wayne burdick

Re: K3 question re dual receive

Administrator

On Aug 9, 2007, at 5:29 AM, K2ZR wrote:

> What protects the KRX3 sub-receiver from RF overload when it gets its
> signal from the unused KATS ATU antenna jack?
> 73, Dick K2ZR
>

The KRX3's aux RX input includes a carrier-operated relay and
gas-dicharge tube.

73,
Wayne
N6KR

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wayne burdick

Re: K3 question re dual receive

Administrator

In reply to this post by Bill W4ZV

On Aug 9, 2007, at 3:13 AM, Bill Tippett wrote:

>
>
> N6KR:
>> The KRX3 subreceiver can either share the main receiver's RF path or
>> get its signal from the unused KAT3 ATU antenna jack.
>
> Can't we use the RX antenna port on the $79 KXV3?

Hi Bill,

If there's no KAT3 installed, you still have a few options.

Normally, the sub will share the RF path of the main receiver, and that
includes the RX ANT. I.e., if the main RX is running from the RX
antenna jack, then the sub will, too, if it's sharing RF.

You can switch the KRX3 to its auxiliary input, but if you don't have a
KAT3, the question is what to connect it to. The present KXV3 doesn't
have provisions for routing RX ANT only to the sub. But there are three
other sources you could use for the KRX3's aux input: (1) the SO239 at
ANT2 (normally supplied only with the KAT3, but you could order one and
install it just for the sub); (2) a BNC jack, below ANT2 (labeled "AUX
RF" and not normally supplied, but we could provide one on request);
(3) the BNC jack on the KXV3 normally targeted as the buffered I.F.
output (but you'd lose I.F. out capability).

Also, if there's enough demand for an antenna-switch-only version of
the KAT3, we could offer one in the future. You'd then be able to
connect the KRX3 to the unused antenna jack, as with the KAT3.

73,
Wayne
N6KR

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John-483

Re: Re: K3 question re dual receive

At 07:43 AM 09/08/07, you wrote:
>Also, if there's enough demand for an antenna-switch-only version of
>the KAT3, we could offer one in the future. You'd then be able to
>connect the KRX3 to the unused antenna jack, as with the KAT3.
>
>73,
>Wayne
>N6KR

Put me on the demand list!

John
k7up

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Ed Muns, W0YK

RE: K3 question re dual receive

In reply to this post by Bill W4ZV

> N6KR:
> >The KRX3 subreceiver can either share the main receiver's
> RF path or get its signal from the unused KAT3 ATU antenna jack.
>
> Can't we use the RX antenna port on the $79 KXV3?

Yes, with the KXV3, you can select the RX antenna for either, or both,
receivers.

73,
Ed - W0YK

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Joe Subich, W4TV

RE: K3 question re dual receive

> Yes, with the KXV3, you can select the RX antenna for either, or both,
> receivers.

Can you select Main (transmit) antenna on the subreceiver and receive
(KXV3 aux) antenna on the main receiver at the same time? Or are you
limited to transmit antenna on the Main receiver and RX antenna on the
sub receiver if you are not using the same antenna for both receivers?

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of J.
> Edward (Ed) Muns
> Sent: Thursday, August 09, 2007 10:55 AM
> To: 'Bill Tippett'
> Cc: [hidden email]
> Subject: RE: [Elecraft] K3 question re dual receive
>
>
> > N6KR:
> > >The KRX3 subreceiver can either share the main receiver's
> > RF path or get its signal from the unused KAT3 ATU antenna jack.
> >
> > Can't we use the RX antenna port on the $79 KXV3?
>
> Yes, with the KXV3, you can select the RX antenna for either, or both,
> receivers.
>
> 73,
> Ed - W0YK
>
> _______________________________________________
> Elecraft mailing list
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>
>

Bjorn

SV: Re: K3 question re dual receive

In reply to this post by John-483

>>Also, if there's enough demand for an antenna-switch-only version of
>>the KAT3, we could offer one in the future. You'd then be able to
>>connect the KRX3 to the unused antenna jack, as with the KAT3.
>>
>>73,
>>Wayne
>>N6KR

>Put me on the demand list!

Me too!

I plan to use my K3 primarily for low band dxing, so RX antenna switching
will be crucial.

Actually I am a little confused as to how RX signals are routed. The reason
I ordered the KRX3 option was to get RX antenna functionality. Basically I
want to be able to have my TX and RX antenna separated and have the choice
to listen to one or the other or both simultaneously.

Should I cancel the KRX3?

73 de Björn /SM0MDG

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David Cutter

Re: SV: Re: K3 question re dual receive

I have the same desires.

David
G3UNA

>
> From: Björn Mohr <[hidden email]>
> Date: 2007/08/10 Fri AM 09:24:33 BST
> To: <[hidden email]>
> Subject: SV: [Elecraft] Re: K3 question re dual receive
>
> >>Also, if there's enough demand for an antenna-switch-only version of
> >>the KAT3, we could offer one in the future. You'd then be able to
> >>connect the KRX3 to the unused antenna jack, as with the KAT3.
> >>
> >>73,
> >>Wayne
> >>N6KR
>
> >Put me on the demand list!
>
> Me too!
>
> I plan to use my K3 primarily for low band dxing, so RX antenna switching
> will be crucial.
>
> Actually I am a little confused as to how RX signals are routed. The reason
> I ordered the KRX3 option was to get RX antenna functionality. Basically I
> want to be able to have my TX and RX antenna separated and have the choice
> to listen to one or the other or both simultaneously.
>
> Should I cancel the KRX3?
>
>
> 73 de Björn /SM0MDG
>
>
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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>
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>

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Ed Muns, W0YK

RE: Re: K3 question re dual receive

In reply to this post by Bjorn

> I plan to use my K3 primarily for low band dxing, so RX
> antenna switching will be crucial.
>
> Actually I am a little confused as to how RX signals are
> routed. The reason I ordered the KRX3 option was to get RX
> antenna functionality. Basically I want to be able to have my
> TX and RX antenna separated and have the choice to listen to
> one or the other or both simultaneously.
>
> Should I cancel the KRX3?

The RX ANT capability comes with the KXV3.

73,
Ed - W0YK

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Brett gazdzinski-2

RE: SV: Re: K3 question re dual receive

In reply to this post by David Cutter

I hope Elecraft eventually looks into diversity receive.
With 2 receivers in the same box, and all the computer stuff,
I would think it would be possible to do some sort of diversity
reception, its real handy for swl and AM work, and can help
a lot on there modes also.
I could hook up the home brew G5RV and the vertical, often one
is working much better than the other at any given moment....

I would think diversity would put the K3 well beyond what
any other radio could hope for in RX performance.

Brett
N2DTS

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N8LP

Re: K3 question re dual receive

I would also like to see a DSP implementation of a noise canceller
similar in concept to the MFJ-1026, which samples QRN on an aux antenna,
and subtracts that from the signal on the main antenna. It can be very
effective for low band local QRN, but the MFJ implementation is not very
convenient or well done. This seems like a perfect fit for DSP, and the
hardware is there already.

I am posting this to both lists, since my emails to the regular
reflector periodically get blocked by the SPAM filter.

73,
Larry N8LP

Brett gazdzinski wrote:

> I hope Elecraft eventually looks into diversity receive.
> With 2 receivers in the same box, and all the computer stuff,
> I would think it would be possible to do some sort of diversity
> reception, its real handy for swl and AM work, and can help
> a lot on there modes also.
> I could hook up the home brew G5RV and the vertical, often one
> is working much better than the other at any given moment....
>
> I would think diversity would put the K3 well beyond what
> any other radio could hope for in RX performance.
>
>
> Brett
> N2DTS
>
> _______________________________________________
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>
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> Elecraft web page: http://www.elecraft.com
>
>

Ed Muns, W0YK

RE: SV: Re: K3 question re dual receive

In reply to this post by Brett gazdzinski-2

> I hope Elecraft eventually looks into diversity receive.

This capability is in the initial release, using the KRX3 and KAT3. The
KAT3 provides a second SO239 antenna connector and then the ANT button on
the front panel allow the operator to select ANT1 or ANT2. The KRX3 can be
configured in one of two states. The first state uses the same receive
antenna as chosen by the main receiver, i.e., ANT1, ANT2 or RX ANT (if there
is a KXV3 installed). The second KRX3 state uses the UNUSED SO239, so if
the main RX is set on ANT1, then the KRX3 would use ANT2. This is the basic
diversity reception setup with the K3.

With a KXV3, you can also do diversity reception with the main receiver
using the RX ANT antenna and the KRX3 using the "other" SO239 ANTn connector
that the TX is not using. This allows you to have two receiving antennas
for diversity reception and yet a third antenna for transmitting.

73,
Ed - W0YK

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Bjorn

SV: Re: K3 question re dual receive

In reply to this post by Bjorn

I wrote a week ago or so;

>>> I plan to use my K3 primarily for low band dxing, so RX antenna
switching will be crucial.

Actually I am a little confused as to how RX signals are routed. The reason
I ordered the KRX3 option was to get RX antenna functionality. Basically I
want to be able to have my TX and RX antenna separated and have the choice
to listen to one or the other or both simultaneously.

Should I cancel the KRX3? <<<

I realize there was an error in my text, I am not questioning my order of
the second RX but I what I wonder is if the KXV3 transverter interface will
bring anything to the table when it comes to the second RX. I have not
ordered the tuner as I don't see any point to tuned on the radio end of the
coax...

My question is, how do I get the functionality I need as described above.

73 de Björn /SM0MDG

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Ed Muns, W0YK

RE: Re: K3 question re dual receive

> >>> I plan to use my K3 primarily for low band dxing, so RX antenna
> switching will be crucial.
>
> Actually I am a little confused as to how RX signals are
> routed. The reason I ordered the KRX3 option was to get RX
> antenna functionality. Basically I want to be able to have my
> TX and RX antenna separated and have the choice to listen to
> one or the other or both simultaneously.

The RX Antenna input comes with the KXV3 option, not the KRX3.

> Should I cancel the KRX3? <<<

Having the KRX3 in a K3 could be based on a lot of things. But, if the
absolutely only reason you ordered it was to get the RX Antenna capability,
then what you need instead is the KXV3.

> I realize there was an error in my text, I am not questioning
> my order of the second RX but I what I wonder is if the KXV3
> transverter interface will bring anything to the table when
> it comes to the second RX. I have not ordered the tuner as I
> don't see any point to tuned on the radio end of the coax...

The KXV3's capability with the second receiver is still not fully defined.
What is defined is that the RX ANT input will be routed to both the main and
second receiver if the KRX3 is configured for "shared mode". If the KRX3 is
in "auxiliary mode", then it uses the input connected to the KRX3 secondary
coax, normally the non-TX SO239 on the KAT3. But, as Wayne has discussed
several times on this reflector, that KRX3 secondary coax could be connected
to another location, such as a BNC installed in the currently vacant AUX RF
position on the rear panel. That would allow you to have a different RX
antenna on the second receiver than what is on the main receiver. It would
also allow you to have a RX antenna on the second receiver, while the main
receiver uses the TX antenna for receive. An example of what is not yet
determined in the KXV3 functionality is whether duplex TX/RX can be done
with the transverter input and output.

> My question is, how do I get the functionality I need as
> described above.

I'm hesitant to say with certainty because there is a lot of information
missing from these emails. But, I "think" all you need is the KXV3 option
if all you want is to have a separate RX antenna from your transmit antenna.
But, there are many uses of a second receiver, e.g., diversity reception
that has also been discussed on this reflector, and I can't tell from your
emails how the KRX3 would be useful to you.

73,
Ed - W0YK

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Ken Wagner K3IU

Re: SV: Re: K3 question re dual receive

In reply to this post by Bjorn

This is what Wayne posted on Aug 9th.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~

On Aug 9, 2007, at 3:13 AM, Bill Tippett wrote:

>/
/>/
/>/ N6KR:
/>>/ The KRX3 subreceiver can either share the main receiver's RF path or
/>>/ get its signal from the unused KAT3 ATU antenna jack.
/>/
/>/ Can't we use the RX antenna port on the $79 KXV3?
/
Hi Bill,

If there's no KAT3 installed, you still have a few options.

Normally, the sub will share the RF path of the main receiver, and that
includes the RX ANT. I.e., if the main RX is running from the RX
antenna jack, then the sub will, too, if it's sharing RF.

You can switch the KRX3 to its auxiliary input, but if you don't have a
KAT3, the question is what to connect it to. The present KXV3 doesn't
have provisions for routing RX ANT only to the sub. But there are three
other sources you could use for the KRX3's aux input: (1) the SO239 at
ANT2 (normally supplied only with the KAT3, but you could order one and
install it just for the sub); (2) a BNC jack, below ANT2 (labeled "AUX
RF" and not normally supplied, but we could provide one on request);
(3) the BNC jack on the KXV3 normally targeted as the buffered I.F.
output (but you'd lose I.F. out capability).

Also, if there's enough demand for an antenna-switch-only version of
the KAT3, we could offer one in the future. You'd then be able to
connect the KRX3 to the unused antenna jack, as with the KAT3.

73,
Wayne
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
N6KR

Björn Mohr wrote:

> I wrote a week ago or so;
>
>
>>>> I plan to use my K3 primarily for low band dxing, so RX antenna
>>>>
> switching will be crucial.
>
> Actually I am a little confused as to how RX signals are routed. The reason
> I ordered the KRX3 option was to get RX antenna functionality. Basically I
> want to be able to have my TX and RX antenna separated and have the choice
> to listen to one or the other or both simultaneously.
>
> Should I cancel the KRX3? <<<
>
>
> I realize there was an error in my text, I am not questioning my order of
> the second RX but I what I wonder is if the KXV3 transverter interface will
> bring anything to the table when it comes to the second RX. I have not
> ordered the tuner as I don't see any point to tuned on the radio end of the
> coax...
>
> My question is, how do I get the functionality I need as described above.
>
>
> 73 de Björn /SM0MDG