[Elecraft] K3 Chirp on 6 Meters

[Peter Chamalian]

The voltage read by the internal K3 meter says the voltage drops to 12.6
volts which I reported to the tech's at Elecraft.  They did not think it
significant.  Also, the problem only has been reported on 6 meters.  I'm a
98% Cw operator so if there was a hint of a chirp on the HF bands, it would
have been brought to my attention by those I work regularly.

The power lead I use is the one supplied by Elecraft.

Pete, W1RM


-----Original Message-----
From: Adrian [mailto:vk4tux at bigpond.com] 
Sent: Sunday, August 12, 2012 10:04 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Chirp on 6 Meters

Measuring voltdrop at the supply i.e. 13.77v to 13.74v is irrelevant. Please
tell us what it is at the APP connector or screen (load end) please?
 

I had several of them and my K3 is back at Elecraft right now for service,
but they are not able to reproduce the problem.  I know there is a mod for
the synthesizer board and that was made without solving the problem.  No,
it's not my power supply either - a big 50 amp Astron provides 13.77 volts
key up and 13.74 volts key down.  It's not RF because when I got the report
I reduced power (external amp off) down to the point where the station could
not copy me and the chirp was still there.

 

The strange thing is I had a local listen to my signal and it was clean.  At
a later time, two reports (one from eastern MA the other from SC and I'm in
central CT) said I had a chirp.  In both cases I had been on 6 for a while.

 

Is it frequency dependent?  Is it heat dependent?

 

Again, I would appreciate hearing from you if you have had reports of a
chirp on 6 meters - what frequency were you on at the time?  How long had
you been operating (was the rig getting warm?) or any other observation that
might help to pinpoint a way of duplicating the problem.

 

Thanks!

 

Pete, W1RM

 

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