Lee,
The Alpha 87A uses PIN diodes for t/r switching, so unless someone
modified it, it's not the amp t/r relay, which is the usual culprit for
this problem.
It could also be a poor connection somewhere in the antenna circuit.
Sometimes a coax plug or socket is oxidized (or whatever) and it has
high resistance for small voltages such as received signals; a shot of
RF cleans it up.
I had a problem like this which drove me nuts for months. It turned out
to be a corroded solder joint in a balun (at the antenna feedpoint, of
course).
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
On 1 Dec 2015 19:06, KY7M wrote:
Towards the end of CQWW CW, I was having issues with the K3 not getting back
to receive when I stopped transmitting. This was an intermittent problem -
if I keyed the radio again with a dit or two, I could get back to full
receive. I could still hear signals, but greatly attenuated when the relay
would hang up. I was using QSK with the K3 and my Alpha 87A. I am not
seeing any fault indication on the 87A and I am trying to figure out if the
problem is in the K3. I also have a KPA500 but have not used it in a
contest lately to know if the problem would repeat with another amplifier or
barefoot. It seems to happen only after heavy use. I think I experienced
it a week earlier in the WAE RTTY contest as well, but did not do as much
operating as in CQWW.
73,
Lee, KY7M
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
