Almost certainly RF getting into the mic circuit. Try a different mic
.. or use the rear panel mic connector as a check. You probably have
high SWR into the antenna feedline (or coax) after the tuner on 20
meters and that is why you only see problem on 20M. High SWR on the
feedline (Note:
Sounds about right to me. It varies a lot with the band in use .. mine
runs hotter on higher frequency bands. I installed (reversible)
modifications in my KPA500 to improve cooling just to keep the fan noise
down.
Don K7FJ
On 6/23/2013 2:33 AM, Arie Kleingeld PA3A wrote:
Hello,
Just
If Jim's ideas don't work you could simply try another detector of a
different brand. Susceptibility to RF varies in unpredictable ways and
that is an easier solution than moving the detector (move it where?
Would it actually help?).
Another approach, if it is a 'wired-in' detector, is to
Toby,
I am far more sensitive to fan noise than most folks and have spent a
lot of time making my KPA500 much quieter by modifying it and by other
means. This topic is probably not of interest to most on this list
because, compared to most amps, the KPA500 is NOT loud (and many have
said it
On 6/18/2012 4:42 AM, David Robertson wrote: ( ... a long message I
won't include here where he improved amplifier cooling by tightening
heatsink/right panel screws and used heatsink compound.)
I operate my KPA500 with the fan speed set to #1 continuously which
delays the increase in the
I really like that idea. I never quite trust the lower power setting of
the K3 when the amplifier is put on-line and always manually check it to
be sure it is where I hope it is. It would be *much* better for the K3
to display the new power setting instead of those unnecessary 'KPA ... '
Sidebars are a visual indication of signal distortion .. not the power
level being transmitted. You have a signal *quality* issue which is
most often caused by overdriving .
Don K7FJ
On 4/30/2012 11:06 AM, KC6CNN wrote:
I am now up and running on psk31.
I had my power set to 25watts and
This is surely an April Fools spoof
On 4/1/2012 11:19 AM, Tony Morgan wrote:
Hey guys,
Check this out, I downloaded it to my iPhone!
https://mail.google.com/mail/help/promos/tap/index.html
73,
Tony W7GO
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Elecraft mailing list
This is one oldtimer who actually used such a design. After more than
58 years I finally understand how it worked .. actually, not very well
for me. Chirps and whoops were very common in those days and I can say
with confidence that they were definitely acceptable and, in fact, were
a
The powercube is definitely a ham amplifier. I know of at least one
owner who is very happy with the one he has but, then, he only operates SSB.
Most amps that use relay T/R switching (and that is *most* amps) do the
clickety-clack thing. I know of failed relays that could not take the
My K3 with Firmware 4.39 has the CW in SSB feature on all bands
including 6 meters in VOX or non-VOX mode. I use it a lot and have
never had a problem.
Don K7FJ
On 2/1/2012 1:48 PM, Joe Subich, W4TV wrote:
On 2/1/2012 2:23 PM, W7GJ, Lance wrote:
One thing that disappointed me is that this
Don,
My first reaction is that compression of 35 is way too high. I never go
over 15 or so because of all of the background noise in the shack that
is picked up by the mic at high compression settings. Something of that
sort is perhaps what you are hearing .. maybe a fan or other hum-like
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