[Elecraft] [K3] K3 VS 7600 Sherwood List

[Vic K2VCO]

Stephen Prior wrote:
> I spent several hours comparing my K3 with an IC7700 a couple of weeks ago.
> I was hard pushed to hear any practical difference between the receivers in
> digging weak signals out of noisy band conditions, but what struck me most
> was that as soon as the Icom went on ssb tx (20m) the whole noise floor rose
> on the K3 dramatically (on the same band about 100kHz away).  Onto transmit
> on the K3 with the IC7700 on rx, there was no sign of the K3 at all.  I
> forget what transmit levels were being used but they were the same with both
> rigs.

This is not only an ICOM problem. When I have operated CW at local Field Days, I've found 
that it is problematic to operate on the same band as the SSB station. As soon as the SSB 
transmitter (various Yaesus and Kenwoods at 100w) goes into transmit, a loud WHOOSH is 
heard on the CW band. The operator doesn't have to speak, just closing the PTT is 
sufficient -- in fact there is no detectable speech sound, indicating that it is not 
related to the RF that is transmitted on purpose!

Bandpass filters eliminated the problem on different bands, but of course could not do 
anything when we operated on the same band. The antennas were located and oriented to 
reduce coupling, but still it was a severe problem.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco