Elecraft

KX3: No RX - SWR 25 to 1

Classic

List

Threaded

15 messages Options

fred carvalho

KX3: No RX - SWR 25 to 1

Hello guys
Need some help to start with.

I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
I have not updated the firmware yet. Still with the one loaded in the
factory.
Recently the radio went mute. Also when trying to match the antenna with
the ATU, SWR displayed 25:1.
It did that sometimes sometimes. Each time it went back to normal. Then
went mute definitely.
I have bypassed the ATU via the Menu, no change.
I have also verified if when mute it was insensitive, but receiving. No
receiving at all.

Any ideas to start with ? Thanks

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]
______________________________________________________________
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

Nr4c

Re: KX3: No RX - SWR 25 to 1

Open it up and check to make sure the BNC connector is plugged into the ATU.
It sounds like the antenna is not connected, you did check this, didn't you?

...bc nr4c

-----Original Message-----
From: Fred Carvalho [mailto:[hidden email]]
Sent: Sunday, August 26, 2012 5:31 PM
To: [hidden email]
Subject: [Elecraft] KX3: No RX - SWR 25 to 1

Hello guys
Need some help to start with.

I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
I have not updated the firmware yet. Still with the one loaded in the
factory.
Recently the radio went mute. Also when trying to match the antenna with
the ATU, SWR displayed 25:1.
It did that sometimes sometimes. Each time it went back to normal. Then
went mute definitely.
I have bypassed the ATU via the Menu, no change.
I have also verified if when mute it was insensitive, but receiving. No
receiving at all.

Any ideas to start with ? Thanks

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]
______________________________________________________________
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

fred carvalho

Re: KX3: No RX - SWR 25 to 1

Hi Bc, yes I did. As I mentioned there is no RX at all, even with my main
station on the air , close by to the KX3.
Fred

2012/8/26 Bill Conkling <[hidden email]>

> Open it up and check to make sure the BNC connector is plugged into the
> ATU.
> It sounds like the antenna is not connected, you did check this, didn't
> you?
>
> ...bc nr4c
>
> -----Original Message-----
> From: Fred Carvalho [mailto:[hidden email]]
> Sent: Sunday, August 26, 2012 5:31 PM
> To: [hidden email]
> Subject: [Elecraft] KX3: No RX - SWR 25 to 1
>
> Hello guys
> Need some help to start with.
>
> I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
> I have not updated the firmware yet. Still with the one loaded in the
> factory.
> Recently the radio went mute. Also when trying to match the antenna with
> the ATU, SWR displayed 25:1.
> It did that sometimes sometimes. Each time it went back to normal. Then
> went mute definitely.
> I have bypassed the ATU via the Menu, no change.
> I have also verified if when mute it was insensitive, but receiving. No
> receiving at all.
>
> Any ideas to start with ? Thanks
>
> --
> Fred C Carvalho - PY2XB
> T30PY & T30SIX Coming in October
> Support this DXpedition : http://www.mdxc.org/t30py/
> [image: T30PY-3D.png]
>
>
>
>
> --
> Fred C Carvalho - PY2XB
> T30PY & T30SIX Coming in October
> Support this DXpedition : http://www.mdxc.org/t30py/
> [image: T30PY-3D.png]
> ______________________________________________________________
> 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
>
>

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]
______________________________________________________________
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

Nr4c

Re: KX3: No RX - SWR 25 to 1

OK....

Unplug all cables except the antenna, turn up volume, .... Still nothing?

Do you see any action on "S-meter"?

Is speaker plugged in to main board?

...bc nr4c

_____

From: Fred Carvalho [mailto:[hidden email]]
Sent: Sunday, August 26, 2012 6:14 PM
To: Bill Conkling
Cc: [hidden email]
Subject: Re: [Elecraft] KX3: No RX - SWR 25 to 1

Hi Bc, yes I did. As I mentioned there is no RX at all, even with my main
station on the air , close by to the KX3.

Fred

2012/8/26 Bill Conkling <[hidden email]>

Open it up and check to make sure the BNC connector is plugged into the ATU.
It sounds like the antenna is not connected, you did check this, didn't you?

...bc nr4c

-----Original Message-----
From: Fred Carvalho [mailto:[hidden email]]
Sent: Sunday, August 26, 2012 5:31 PM
To: [hidden email]
Subject: [Elecraft] KX3: No RX - SWR 25 to 1

Hello guys
Need some help to start with.

I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
I have not updated the firmware yet. Still with the one loaded in the
factory.
Recently the radio went mute. Also when trying to match the antenna with
the ATU, SWR displayed 25:1.
It did that sometimes sometimes. Each time it went back to normal. Then
went mute definitely.
I have bypassed the ATU via the Menu, no change.
I have also verified if when mute it was insensitive, but receiving. No
receiving at all.

Any ideas to start with ? Thanks

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]

--
Fred C Carvalho - PY2XB
T30PY & T30SIX Coming in October
Support this DXpedition : http://www.mdxc.org/t30py/
[image: T30PY-3D.png]

______________________________________________________________
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

--
Fred C Carvalho - PY2XB

T30PY & T30SIX Coming in October

Support this DXpedition : http://www.mdxc.org/t30py/

T30PY-3D.png
<https://mail.google.com/mail/u/0/?ui=2&ik=983e6c67a6&view=att&th=135ececd51
8db670&attid=0.1&disp=thd&realattid=30229c67ce02296_0.1&zw>

______________________________________________________________
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

fred carvalho

Re: KX3: No RX - SWR 25 to 1

Bill, no smeter readings, no reception of strong nearby signals, 25:1 SWR.
Speaker works and has a normal "floor" receiver sound.

2012/8/26 Bill Conkling <[hidden email]>

> OK....****
>
> ** **
>
> Unplug all cables except the antenna, turn up volume, .... Still nothing?
> ****
>
> ** **
>
> Do you see any action on "S-meter"?****
>
> ** **
>
> Is speaker plugged in to main board?****
>
> ** **
>
> ...bc nr4c****
>
> ** **
> ------------------------------
>
> *From:* Fred Carvalho [mailto:[hidden email]]
> *Sent:* Sunday, August 26, 2012 6:14 PM
> *To:* Bill Conkling
> *Cc:* [hidden email]
> *Subject:* Re: [Elecraft] KX3: No RX - SWR 25 to 1****
>
> ** **
>
> Hi Bc, yes I did. As I mentioned there is no RX at all, even with my main
> station on the air , close by to the KX3.****
>
> Fred****
>
> 2012/8/26 Bill Conkling <[hidden email]>****
>
> Open it up and check to make sure the BNC connector is plugged into the
> ATU.
> It sounds like the antenna is not connected, you did check this, didn't
> you?
>
> ...bc nr4c****
>
>
> -----Original Message-----
> From: Fred Carvalho [mailto:[hidden email]]
> Sent: Sunday, August 26, 2012 5:31 PM
> To: [hidden email]
> Subject: [Elecraft] KX3: No RX - SWR 25 to 1
>
> Hello guys
> Need some help to start with.
>
> I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
> I have not updated the firmware yet. Still with the one loaded in the
> factory.
> Recently the radio went mute. Also when trying to match the antenna with
> the ATU, SWR displayed 25:1.
> It did that sometimes sometimes. Each time it went back to normal. Then
> went mute definitely.
> I have bypassed the ATU via the Menu, no change.
> I have also verified if when mute it was insensitive, but receiving. No
> receiving at all.
>
> Any ideas to start with ? Thanks
>
> --
> Fred C Carvalho - PY2XB
> T30PY & T30SIX Coming in October
> Support this DXpedition : http://www.mdxc.org/t30py/
> [image: T30PY-3D.png]
>
>
>
>
> --
> Fred C Carvalho - PY2XB
> T30PY & T30SIX Coming in October
> Support this DXpedition : http://www.mdxc.org/t30py/
> [image: T30PY-3D.png]****
>
> ______________________________________________________________
> 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****
>
>
>
> ****
>
> ** **
>
> --
> Fred C Carvalho - PY2XB****
>
> T30PY & T30SIX Coming in October ****
>
> Support this DXpedition : http://www.mdxc.org/t30py/****
>
> [image: T30PY-3D.png]****
>
> ** **
>

Matt Zilmer

Re: KX3: No RX - SWR 25 to 1

In reply to this post by Nr4c

If the NR4C suggestion doesn't solve your problem, physically remove
the ATU and recheck if you have this problem. If the problem is with
the ATU, this will clear it up. Of course, you should get the ATU
replaced on warranty....

Don't forget to reconnect the BNC internal conductor to the RF board's
antenna connector.

73,
matt W6NIA
KX3 #6 F/T

On Sun, 26 Aug 2012 18:05:26 -0400, you wrote:

>Open it up and check to make sure the BNC connector is plugged into the ATU.
>It sounds like the antenna is not connected, you did check this, didn't you?
>
>...bc nr4c
>
>-----Original Message-----
>From: Fred Carvalho [mailto:[hidden email]]
>Sent: Sunday, August 26, 2012 5:31 PM
>To: [hidden email]
>Subject: [Elecraft] KX3: No RX - SWR 25 to 1
>
>Hello guys
>Need some help to start with.
>
>I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
>I have not updated the firmware yet. Still with the one loaded in the
>factory.
>Recently the radio went mute. Also when trying to match the antenna with
>the ATU, SWR displayed 25:1.
>It did that sometimes sometimes. Each time it went back to normal. Then
>went mute definitely.
>I have bypassed the ATU via the Menu, no change.
>I have also verified if when mute it was insensitive, but receiving. No
>receiving at all.
>
>Any ideas to start with ? Thanks
>
>--
>Fred C Carvalho - PY2XB
>T30PY & T30SIX Coming in October
>Support this DXpedition : http://www.mdxc.org/t30py/
>[image: T30PY-3D.png]

______________________________________________________________
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

fred carvalho

Re: KX3: No RX - SWR 25 to 1

Matt, thanks I will do that tmrw. However if I had any trouble with any
circuit behind the receiver I still would be able to hear my transmission
using my main station. The KX3 is seating besides it. It does not hear
anything.
If it was an analog equipment one could say that the local oscillator stop
oscillating.
If no one reported this kind of problem in this list, I will inquire
Elecraft.

Fred

2012/8/26 Matt Zilmer <[hidden email]>

> If the NR4C suggestion doesn't solve your problem, physically remove
> the ATU and recheck if you have this problem. If the problem is with
> the ATU, this will clear it up. Of course, you should get the ATU
> replaced on warranty....
>
> Don't forget to reconnect the BNC internal conductor to the RF board's
> antenna connector.
>
> 73,
> matt W6NIA
> KX3 #6 F/T
>
>
> On Sun, 26 Aug 2012 18:05:26 -0400, you wrote:
>
> >Open it up and check to make sure the BNC connector is plugged into the
> ATU.
> >It sounds like the antenna is not connected, you did check this, didn't
> you?
> >
> >...bc nr4c
> >
> >-----Original Message-----
> >From: Fred Carvalho [mailto:[hidden email]]
> >Sent: Sunday, August 26, 2012 5:31 PM
> >To: [hidden email]
> >Subject: [Elecraft] KX3: No RX - SWR 25 to 1
> >
> >Hello guys
> >Need some help to start with.
> >
> >I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
> >I have not updated the firmware yet. Still with the one loaded in the
> >factory.
> >Recently the radio went mute. Also when trying to match the antenna with
> >the ATU, SWR displayed 25:1.
> >It did that sometimes sometimes. Each time it went back to normal. Then
> >went mute definitely.
> >I have bypassed the ATU via the Menu, no change.
> >I have also verified if when mute it was insensitive, but receiving. No
> >receiving at all.
> >
> >Any ideas to start with ? Thanks
> >
> >--
> >Fred C Carvalho - PY2XB
> >T30PY & T30SIX Coming in October
> >Support this DXpedition : http://www.mdxc.org/t30py/
> >[image: T30PY-3D.png]
>

Don Wilhelm-4

Re: KX3: No RX - SWR 25 to 1

In reply to this post by fred carvalho

Fred,

Please also be suspicious of the coax, the BNC connector and your antenna.

Can you receive well with that same BNC connector plugged into another
radio? Substitution is the quickest troubleshooting tool in cases like
this one.

73,
Don W3FPR

On 8/26/2012 6:13 PM, Fred Carvalho wrote:
> Hi Bc, yes I did. As I mentioned there is no RX at all, even with my main
> station on the air , close by to the KX3.
> Fred
>
>

______________________________________________________________
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

vk4tux

Re: KX3: No RX - SWR 25 to 1

I would be checking the dc resistance of the the 50 ohm output > bnc back through, as it sounds more
like a short than an open circuit.

Quite often an open will only attenuate a rx signal rather than silence it altogether as a short will do.

Adrian ... vk4tux

Matt Zilmer

Re: KX3: No RX - SWR 25 to 1

In reply to this post by fred carvalho

Hi Fred,

To pin this down a bit further, maybe you could try an experiment.

1. Set the KX3's RX ISO to OFF. This is a MENU function.
2. Put the KX3 on a freq on 40m. Leave it on RX.
3. Put the "main station" on the same 40m freq.
4. Note if your main receiver can hear the KX3's LO (should be able
to hear carrier if RX ISO is OFF). You may need to offset the
receiver's carrier frequency a little to hear the carrier from the
KX3's LO.
5. If #4 is no, you may be correct. The synth isn't producing any
injection frequency. It's a good idea to have some type of antenna,
even a short piece of wire, so that the KX3 radiates just a little
energy that the other receiver can copy.

Just an idea....

Good luck, but with Elecraft support you won't need it...

73,
matt W6NIA

On Sun, 26 Aug 2012 19:50:27 -0300, you wrote:

>Matt, thanks I will do that tmrw. However if I had any trouble with any
>circuit behind the receiver I still would be able to hear my transmission
>using my main station. The KX3 is seating besides it. It does not hear
>anything.
>If it was an analog equipment one could say that the local oscillator stop
>oscillating.
>If no one reported this kind of problem in this list, I will inquire
>Elecraft.
>
>Fred
>
>2012/8/26 Matt Zilmer <[hidden email]>
>
>> If the NR4C suggestion doesn't solve your problem, physically remove
>> the ATU and recheck if you have this problem. If the problem is with
>> the ATU, this will clear it up. Of course, you should get the ATU
>> replaced on warranty....
>>
>> Don't forget to reconnect the BNC internal conductor to the RF board's
>> antenna connector.
>>
>> 73,
>> matt W6NIA
>> KX3 #6 F/T
>>
>>
>> On Sun, 26 Aug 2012 18:05:26 -0400, you wrote:
>>
>> >Open it up and check to make sure the BNC connector is plugged into the
>> ATU.
>> >It sounds like the antenna is not connected, you did check this, didn't
>> you?
>> >
>> >...bc nr4c
>> >
>> >-----Original Message-----
>> >From: Fred Carvalho [mailto:[hidden email]]
>> >Sent: Sunday, August 26, 2012 5:31 PM
>> >To: [hidden email]
>> >Subject: [Elecraft] KX3: No RX - SWR 25 to 1
>> >
>> >Hello guys
>> >Need some help to start with.
>> >
>> >I have a KX3 purchased in May. It has the roofing filter and the ATU unit.
>> >I have not updated the firmware yet. Still with the one loaded in the
>> >factory.
>> >Recently the radio went mute. Also when trying to match the antenna with
>> >the ATU, SWR displayed 25:1.
>> >It did that sometimes sometimes. Each time it went back to normal. Then
>> >went mute definitely.
>> >I have bypassed the ATU via the Menu, no change.
>> >I have also verified if when mute it was insensitive, but receiving. No
>> >receiving at all.
>> >
>> >Any ideas to start with ? Thanks
>> >
>> >--
>> >Fred C Carvalho - PY2XB
>> >T30PY & T30SIX Coming in October
>> >Support this DXpedition : http://www.mdxc.org/t30py/
>> >[image: T30PY-3D.png]
>>

Bill Tubbs, WK6A

K2/10 for sale

I have a nicely completed K2, SN# 656, 10 watts, for sale.

I'm the second owner (bought this back in March) and the original builder did a
great job on it. All I've done since buying it is add the KBT2 internal battery
kit. The previous owner also installed a Yaesu main tuning knob which I wasn't
aware of until recently because I've never seen another K2 up close.

It also has a Ten Tec handheld mike wired for it.

It has:

KSB2 SSB
K160RX 160M
KNB2 NB
KAT2 ATU
KAF2 audio filter
KBT2 battery kit

I also have, but have not installed, all of the upgrades to make it current.
This would give you a little of the "kit experience" when you install all of
these. Looks like a new kit would run about $1400-1500 on the Elecraft ordering
page. I would sell it all for $1000.

Thanks for reading!

73,
Bill
WK6A
______________________________________________________________
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

Geoffrey Mackenzie-Kennedy-3

Re: KX3: No RX - SWR 25 to 1

In reply to this post by fred carvalho

Hi Fred,

The problem as you have described it does suggest that either 1) The KX3's
LO (the synthesiser) is not working, or 2) The LO is working, but its output
is not getting to the receiver and transmitter mixers because of a broken
connection or a bad solder joint. I do not have any details of the pcb
layout to see how the LO is connected to the mixers.

It would be a good idea, I believe, to try the experiment which Matt W6NIA
suggested. But because the LO might be working and its output is not
getting to the mixers, I would do one more thing if you do not hear the LO
on your main receiver (Matt's test 4). I would use a "Sniffer" connected to
the input of your main receiver to see if the LO is working or not.

In case you are not familiar with "Sniffers", a useful "Sniffer" can be made
from a loop of insulated wire (not enamel) about 3 cms long, one end
connected to the centre conductor of small coax, the other end to the coax's
braid. It is wise to insulate the connections. In this case the other end
of the coax is connected to your main receiver.

By placing the "Sniffer" close to the LO chip, if the LO is working you
should hear it at good strength on your main receiver. By placing the
"Sniffer" close to each of the mixers, you should also be able to tell if
the LO signal is reaching the mixers or not.

Good luck!

73,
Geoff
LX2AO

On August 27, 2012 at 12:50 AM, Fred Carvalho wrote:

< snip>

> If it was an analog equipment one could say that the local oscillator stop
> oscillating.

<snip>

On August 27, 2012 at 2:43 AM, Matt Zilmer wrote :

> Hi Fred,
>
> To pin this down a bit further, maybe you could try an experiment.
>
> 1. Set the KX3's RX ISO to OFF. This is a MENU function.
> 2. Put the KX3 on a freq on 40m. Leave it on RX.
> 3. Put the "main station" on the same 40m freq.
> 4. Note if your main receiver can hear the KX3's LO (should be able
> to hear carrier if RX ISO is OFF). You may need to offset the
> receiver's carrier frequency a little to hear the carrier from the
> KX3's LO.
> 5. If #4 is no, you may be correct. The synth isn't producing any
> injection frequency. It's a good idea to have some type of antenna,
> even a short piece of wire, so that the KX3 radiates just a little
> energy that the other receiver can copy.

fred carvalho

Re: KX3: No RX - SWR 25 to 1

In reply to this post by fred carvalho

Geofrey and Matt

I have done what Matt suggested and used an oscilloscope probe at the ouput
of the receiver to check for the LO carrier with the RX ISO off. Nothing.
So this seems to be the problem

However during my tests, the reception went back on for a while. It does
this !!! I will try to check for the LO when it returns to make sure I have
both situtions checked.

BTW I have tried to find a bad connection on the main board by applying
some pressure with my fingers, but nothing happens.

In case the Rx returns I will check for the carrier with the osciloscope.
Thanks Fred

2012/8/27 Geoffrey Mackenzie-Kennedy <[hidden email]>

> Hi Fred,
>
> The problem as you have described it does suggest that either 1) The KX3's
> LO (the synthesiser) is not working, or 2) The LO is working, but its
> output is not getting to the receiver and transmitter mixers because of a
> broken connection or a bad solder joint. I do not have any details of the
> pcb layout to see how the LO is connected to the mixers.
>
> It would be a good idea, I believe, to try the experiment which Matt W6NIA
> suggested. But because the LO might be working and its output is not
> getting to the mixers, I would do one more thing if you do not hear the LO
> on your main receiver (Matt's test 4). I would use a "Sniffer" connected
> to the input of your main receiver to see if the LO is working or not.
>
> In case you are not familiar with "Sniffers", a useful "Sniffer" can be
> made from a loop of insulated wire (not enamel) about 3 cms long, one end
> connected to the centre conductor of small coax, the other end to the
> coax's braid. It is wise to insulate the connections. In this case the
> other end of the coax is connected to your main receiver.
>
> By placing the "Sniffer" close to the LO chip, if the LO is working you
> should hear it at good strength on your main receiver. By placing the
> "Sniffer" close to each of the mixers, you should also be able to tell if
> the LO signal is reaching the mixers or not.
>
> Good luck!
>
> 73,
> Geoff
> LX2AO
>
>
> On August 27, 2012 at 12:50 AM, Fred Carvalho wrote:
>
> < snip>
>
>
> If it was an analog equipment one could say that the local oscillator stop
>> oscillating.
>>
>
> <snip>
>
>
> On August 27, 2012 at 2:43 AM, Matt Zilmer wrote :
>
>
> Hi Fred,
>>
>> To pin this down a bit further, maybe you could try an experiment.
>>
>> 1. Set the KX3's RX ISO to OFF. This is a MENU function.
>> 2. Put the KX3 on a freq on 40m. Leave it on RX.
>> 3. Put the "main station" on the same 40m freq.
>> 4. Note if your main receiver can hear the KX3's LO (should be able
>> to hear carrier if RX ISO is OFF). You may need to offset the
>> receiver's carrier frequency a little to hear the carrier from the
>> KX3's LO.
>> 5. If #4 is no, you may be correct. The synth isn't producing any
>> injection frequency. It's a good idea to have some type of antenna,
>> even a short piece of wire, so that the KX3 radiates just a little
>> energy that the other receiver can copy.
>>
>

Geoffrey Mackenzie-Kennedy-3

Re: KX3: No RX - SWR 25 to 1

Hello Fred,

During the time when your reception is OFF, would be the best time to check
whether or not the LO is working, i.e. during the time when the fault
exists. It would also be the best time to check whether the LO's output is
reaching the mixers if the LO is working.

73,

Geoff
LX2AO

On August 27, 2012 4:04 PM, Fred Carvalho wrote:

<snip>

> However during my tests, the reception went back on for a while. It does
> this !!! I will try to check for the LO when it returns to make sure I
> have both situtions checked.

<snip>

______________________________________________________________
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

fred carvalho

Re: KX3: No RX - SWR 25 to 1

The LO is not working Geoffrey. I would like to have it back on, so I could
check in both situations. However, when I first got the radio I remember
hearing a strong signal from the LO in my main transceiver's receiver. Now
it is not the case.

I have been well supported by Elecraft and it is been decided that the best
would be sending the radio to them.

Thanks you guys for the inputs. Fred

2012/8/28 Geoffrey Mackenzie-Kennedy <[hidden email]>

> Hello Fred,
>
> During the time when your reception is OFF, would be the best time to check
> whether or not the LO is working, i.e. during the time when the fault
> exists. It would also be the best time to check whether the LO's output is
> reaching the mixers if the LO is working.
>
> 73,
>
> Geoff
> LX2AO
>
>
> On August 27, 2012 4:04 PM, Fred Carvalho wrote:
>
> <snip>
>
>
> However during my tests, the reception went back on for a while. It does
>> this !!! I will try to check for the LO when it returns to make sure I
>> have both situtions checked.
>>
>
> <snip>
>
>
>
>
>
>
>
>
>
>