k3 main rcvr issue

[Jim Mornar]

Hello,

I just completed assembly of my K3/100 with subrx and 2.8khz, 400hz and
250hz filters in each rcvr.  Very impressive rig.

On the main rcvr, while tuning across the 40m band, I get a "dead spot"
about every 5khz, thats about 1/2 khz wide.  I would say any signals are
attenuated at least 20 db.  The interval varies from band to band.  It seems
to do it on all bands to a varying degree.  The problem does not show up on
the sub rcvr... any thoughts?

I was going to try and remove the sub rx and see if that has any affect.

Jim N9TK

______________________________________________________________
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]

Jim,

Did you do the calibrations?  Particularly the Synthesizer and Reference
Oscillator?
If not, try those first, and if you have already done that, try doing it
again.

73,
Don W3FPR

On 10/5/2013 1:15 PM, Jim Mornar wrote:

> Hello,
>
> I just completed assembly of my K3/100 with subrx and 2.8khz, 400hz and
> 250hz filters in each rcvr.  Very impressive rig.
>
> On the main rcvr, while tuning across the 40m band, I get a "dead spot"
> about every 5khz, thats about 1/2 khz wide.  I would say any signals are
> attenuated at least 20 db.  The interval varies from band to band.  It seems
> to do it on all bands to a varying degree.  The problem does not show up on
> the sub rcvr... any thoughts?
>
> I was going to try and remove the sub rx and see if that has any affect.
>
>

______________________________________________________________
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

[Jim Mornar]

Okay list, here's what I've found so far between family commitments and
watching the Bears lose...

I tried recalibrating both ksyn3 boards but no improvement.  I then tried
removing the Sub rcvr, and the main still has the dead spots, about every 5
khz and in fact, the rcvr is totally dead in those spots. The P3 goes blank
at those points too. I then thought since I had two of the ksyn3 boards, I
would try the one from the sub in the main position since the sub didn't
have those dead spots... Viola!  After recalibrating the ksyn3 in the main
slot, the main rcvr works perfectly.  So to confirm it was the ksyn3 board,
I popped it into the sub slot and reinstalled the sub rx and it now has the
dead spots.  I'll be calling Elecraft tomorrow and asking them to send me a
new ksyn3 board.

Thanks to all and I'll keep the faith!

Jim N9TK


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Jim Mornar
Sent: Saturday, October 05, 2013 12:15 PM
To: [hidden email]
Subject: [Elecraft] k3 main rcvr issue


Hello,

I just completed assembly of my K3/100 with subrx and 2.8khz, 400hz and
250hz filters in each rcvr.  Very impressive rig.

On the main rcvr, while tuning across the 40m band, I get a "dead spot"
about every 5khz, thats about 1/2 khz wide.  I would say any signals are
attenuated at least 20 db.  The interval varies from band to band.  It seems
to do it on all bands to a varying degree.  The problem does not show up on
the sub rcvr... any thoughts?

I was going to try and remove the sub rx and see if that has any affect.

Jim N9TK

______________________________________________________________
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