Hi Everyone,
I'm re doing the thread as this time I have some concrete findings to
share with you and wail be writing to Elecraft about this problem.
My previous thread was about "ringing" in the audio but now it is
harmonic distortion at three times the frequency.
I went around M0GJH's house house with my K3 and put it side by side
with his.
I found the same distortion by listening on his radio too.
A CW signal (as well as SSB) sounds a bit distorted and so we put the
output into his PC which was running Ham Radio Deluxe DM780 with a
waterfall display.
Here you could quite clearly see that at 3 times any CW signal a signal
was present and was beating with the fundamental causing distortion.
The bandwidth was set to 1.5KHz and NR off. In fact with NR in there was
no difference of the 3rd harmonic it was still there and very noticeable.
Fundamental frequency received = 800Hz, Harmonic on waterfall display =
2400Hz.
The RX EQ was set to flat.
Mode used was CW.
Line out from the back was used.
Andrew M0GJH had mainly presumed that signals which sounded a bit
"rough" were due to the station sending but in fact and it is my belief
that there is a problem with the K3 be it in the audio section or
DSP.... this I do not know as I don't have the knowledge.
I hope there is a cure for this as it's frustrating listening to CW with
this sort of distortion.
Cheers,
Berni
G0IDA
#1474
--
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
