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K3: verifying IF output

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Matt Murphy

K3: verifying IF output

I'm wondering if anyone could advise on the best way to verify that the
K3's IF output is present and working properly. I have connected an LP-PAN
unit and I have two hypotheses about what might be wrong, one is that there
is no IF output and the other is that something is wrong with the LP-PAN.
I verified that the TMP cable is plugged in properly into the RF board and
KXV3 but don't have any other devices which consume the IF output so I
can't be sure it's actually operating properly.

Suggestions would be much appreciated.

73,
Matt NQ6N
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Iain MacDonnell - N6ML-2

Re: K3: verifying IF output

Hi Matt,

If you have another rig that can receive at 8.215Mhz, connect it to
the K3's IF out, and you should hear the same signal that you hear
from the K3.

73,

~iain / N6ML

On Sun, Mar 4, 2012 at 10:36 AM, Matt Murphy <[hidden email]> wrote:

> I'm wondering if anyone could advise on the best way to verify that the
> K3's IF output is present and working properly. I have connected an LP-PAN
> unit and I have two hypotheses about what might be wrong, one is that there
> is no IF output and the other is that something is wrong with the LP-PAN.
> I verified that the TMP cable is plugged in properly into the RF board and
> KXV3 but don't have any other devices which consume the IF output so I
> can't be sure it's actually operating properly.
>
> Suggestions would be much appreciated.
>
> 73,
> Matt NQ6N
> ______________________________________________________________
> 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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Matt Murphy

Re: K3: verifying IF output

Thanks to Iain and the others who responded off the reflector. I plugged
in the K3's IF output to the second rig's sub RX input and sure enough
heard the same signals. When the Sub-RX was set to 8.215 MHz it appeared
that there was about a -1.3 KHz difference between the VFO position that
would tune in the signal on the K3 vs via the IF. I imagine this is normal
(someone please let me know if it's not).

So it appears that I have properly functioning IF output. I have gone
through various troubleshooting approaches with the LP Pan (jumpers,
levels, etc.) and it still does not appear to be working -- only noise
shows up. I have a softrock which works fine w/ both sound cards. I think
I'm approaching the end of the troubleshooting I can do (I don't have a
sufficient oscilloscope to test the LP-PAN's oscillator), so if anyone has
any suggestions for things to try at this point I'd appreciate the advice.

Thanks again!

73,
Matt NQ6N

On Sun, Mar 4, 2012 at 10:50 AM, iain macdonnell - N6ML <[hidden email]>wrote:

> Hi Matt,
>
> If you have another rig that can receive at 8.215Mhz, connect it to
> the K3's IF out, and you should hear the same signal that you hear
> from the K3.
>
> 73,
>
> ~iain / N6ML
>
>
>
> On Sun, Mar 4, 2012 at 10:36 AM, Matt Murphy <[hidden email]> wrote:
> > I'm wondering if anyone could advise on the best way to verify that the
> > K3's IF output is present and working properly. I have connected an
> LP-PAN
> > unit and I have two hypotheses about what might be wrong, one is that
> there
> > is no IF output and the other is that something is wrong with the LP-PAN.
> > I verified that the TMP cable is plugged in properly into the RF board
> and
> > KXV3 but don't have any other devices which consume the IF output so I
> > can't be sure it's actually operating properly.
> >
> > Suggestions would be much appreciated.
> >
> > 73,
> > Matt NQ6N
> > ______________________________________________________________
> > 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
>

Don Wilhelm-4

Re: K3: verifying IF output

Matt,

Did you use the same cable to connect to the 2nd rig as you are using to
connect to LP-Pan?
It would not be the first time a faulty cable was to blame.

73,
Don W3FPR

On 3/4/2012 2:38 PM, Matt Murphy wrote:
> Thanks to Iain and the others who responded off the reflector. I plugged
> in the K3's IF output to the second rig's sub RX input and sure enough
> heard the same signals. When the Sub-RX was set to 8.215 MHz it appeared
> that there was about a -1.3 KHz difference between the VFO position that
> would tune in the signal on the K3 vs via the IF. I imagine this is normal
> (someone please let me know if it's not).
>
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Matt Murphy

Re: K3: verifying IF output

Don -- Yes, same cable. I just had a faulty audio cable from radio shack
the other day.

73,
Matt NQ6N

On Sun, Mar 4, 2012 at 12:02 PM, Don Wilhelm <[hidden email]> wrote:

> Matt,
>
> Did you use the same cable to connect to the 2nd rig as you are using to
> connect to LP-Pan?
> It would not be the first time a faulty cable was to blame.
>
> 73,
> Don W3FPR
>
>
> On 3/4/2012 2:38 PM, Matt Murphy wrote:
>
>> Thanks to Iain and the others who responded off the reflector. I plugged
>> in the K3's IF output to the second rig's sub RX input and sure enough
>> heard the same signals. When the Sub-RX was set to 8.215 MHz it appeared
>> that there was about a -1.3 KHz difference between the VFO position that
>> would tune in the signal on the K3 vs via the IF. I imagine this is
>> normal
>> (someone please let me know if it's not).
>>
>>

Alan Bloom

Re: K3: verifying IF output

In reply to this post by Matt Murphy

The easiest way is to hook up a receiver tuned to 8.215 MHz to the K3's
IF output. Signals should be almost as strong on the receiver as they
are on the K3.

Alan N1AL

On Sun, 2012-03-04 at 10:36 -0800, Matt Murphy wrote: