[Elecraft] K3 bad TX

[Mike Harris]

G'day,

For what it is worth.

Just done a quick test with my K3/K2 combo.

K3 14020kHz.  50W into my beam.

K2 with no antenna connected receives a signal at S9+20 on the 
S-meter.  Keying at 14013.67kHz and 14026.38kHz was heard. 
Additionally I heard signals at 14007.24kHz and 14000.99kHz, didn't 
tune further above the test signal.  The Pre-amp needed to be on but 
the signals were sufficient to trigger the CW tuning indicator. 
Close in TX noise faded out below the 14007.24kHz test signal.

Draw your own conclusions.  Mine are that there is a very low level 
signal comb approximately at +/- 6.33kHz intervals either side of 
the K3 transmission.  Someone else suitably equipped can measure how 
far down.

Regards,

Mike VP8NO

----- Original Message ----- 
From: "Toni Lindén" <oh2ua at oh2u.com>
To: <elecraft at mailman.qth.net>
Sent: Sunday, October 04, 2009 10:21 AM
Subject: [Elecraft] K3 bad TX


I was using SO2R with pair of K3s' and had similar reports with both
radios, so I guess it's not the amp issue. The bands where I got
reports were 20M and 15M (on 10M were no propagation and maybe 40M 
and
80M were too noisy to notice the 2nd sigs).

All antennas are OK and no difference was noted with antennas.

73 de Toni, OH2UA


>Tke the amp out of the equation and see if you still have the 
>issue. Try a
>different antenna and check the SWR. I would suspect one of those 
>to be the
>issue. At least it will eliminate some variables.
>
>Dan AB3EN
>

Toni Lindén wrote:
>
> Hi!
>
> I was trying K3 for first time in SAC contest a couple of weeks 
> ago.
>
> During the contest I got multiple reports that besides of my run
> frequency, I also had other reasonable strong signals "around the
> band".
>
> It cleared out that I had at least one other signal about 7kHz 
> away
> from my actual freq. It was quite strong, maybe 40dBs down from my
> running freq.
>
> Have anyone else had similar problems and do you have any 
> suggestion
> how to fix this?
>
> I was using only about 60 to 70 watts drive for the amp and amp 
> was
> not pushed over. The same appears on both, CW and SSB. Radio has 
> the
> most resent FWs available via K3 utility SW.
>
> I'm planning to take K3 with me to CU2 for CQWW, but after getting
> such a bad reports about "my 2nd pileup" on the same band, I'm not
> sure if I'm willing to make such an interference to others on 
> CQWW...
>
> So if anyone has any advice, I'm more than pleased to hear!
>
>
> 73 de Toni, OH2UA
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

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


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.409 / Virus Database: 270.14.3/2413 - Release Date: 
10/04/09 06:20:00