[Elecraft] K3 strange rx noise

[Joe Wheeler]

Martin,
I experienced a similar problem two weeks ago in the WAE RTTY contest.  My
K3 is s/n 3035 with sub receiver and I was running 3.57 firmware at the time
with N1MM contest software thru a microHAM micro Keyer II.

The only difference is my problem was in another band section on 80 meters:
3.586 to slightly above 3600...the upper 3/4 of the RTTY section.  Your
description of the problem is very good and I would only add that there
seemed to be a complete loss of sensitivity of existing signals in that band
section.  I know because I checked on another receiver and that section of
the band was full of RTTY signals I could not hear on the K3.  What I did
hear on the K3 was very similar to what you described.

Since I was in the middle of a contest, I did not spend any time trouble
shooting nor do I remember all the settings.  This is the only time I have
had the problem and I have not been able to duplicate it again.

I agree, very weird.

Joe K4HMB


DM4iM wrote:
> 
> Elecrafters, i had a strange noise on 80m ssb last night and the night
> before.  When tuning up the band, the noise set in at exactly 3.686.000
> like someone had flipped a switch.
> It went away at -say- 3.692.xxx, i can't remember exactly.
> When tuning in the opposite direction, it set in 1 or 2 khz below the
> frequency where it stopped when tuning upwards, and went away when
> tuning below 3.686.000, again like with the flip of a switch. I could
> repeat that several times.
> It sounded like a totally overloaded frontend.
> Like the bandfilter was bypassed. Like the whole 80m-band was received
> in that small portion of the band. I heard cw, ssb, harsh noise, all
> over this small frequency range, even on a single frequency, no matter
> where i tuned.
> It imediatelly went away when i switched ON the sub-rx, and IT STAYED
> AWAY when i switched the sub-rx OFF again. All back to normal,  with
> some stations ragchewing in that portion of the band.
> This is the best i can describe it with my limited knowledge of the
> english language.
> I could not get the K3 to do it again. It seems like the K3 was stuck in
> a weird condition. Firmware is latest, but it also happened with the
> earlier firmware.
> 
> Martin
> 
> 
> -- 
> 
> 73, DM4iM
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