Jimmy Lee wrote:
Lyle and all others, I have done a poor job of explaining my problem.
There is a low frequency sound just as the key is closed on ever
single sound that is keyed. Does not seem to be related to QSK.
Thanks, Jimmy
I have experienced this with some (not all headphones). It is worse if
for some reason you plug the 'phones into the external speaker jack
instead of the headphone jack.
Also, I had a switching system which allowed me to switch the audio,
keying, and antenna between my K2 and another rig; I found that when I
used this, the thump was much worse! I suspect that the cable to the
'phones was close to the DC power cable of my K2/100 and the thump was
actually induced in the 'phone cable by the large current in the power
cable.
You can reduce the thump by putting a capacitor (I used back-to-back 4.7
uf electrolytics) in series with the 'phones. One pair of 'phones that
I have requires this even when plugged directly into the headphone jack
on the K2.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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