This sounds exactly like the problem I report to the reflector on 11/23
titled "K3 AFSK RTTY overdrive - no ALC". Everyone on the reflector
poo-poo'd it as it being a problem on my end. I'm glad to see others come
out of the woodwork with the same problem. I haven't tried RTTY since
upgrading to the latest firmware to see if it's gotten worse, but the
"ticking" sound would go away when I only used about 2 bars of ALC, but then
it was difficult to get the full 100W output. Mine, too, was present in TX
TEST mode, so I knew it wasn't a RF issue.
In listening to the signal on another receiver the ticking/crackling seems
to make the TX signal wider, but that's only by ear....I don't have a scope.
Chad WE9V
On Wed, Dec 31, 2008 at 4:39 PM, Iain MacDonnell - N6ML <a...@dseven.org>wrote:
>
> Preparing for the ARRL RTTY Round-Up this weekend, I ran into a strange
> problem. Using "AFSK A" mode, feeding transmit audio into the K3's line
> in from the computer running MMTTY (also tried with DM780, with the same
> result), I would get a crackling noise along with the RTTY tones in the
> K3's monitor audio. I don't know if the crackling is transmitted, or
> just in the monitor. Levels are set for 5 bars on the ALC meter, and
> the problem occurs in "TX TEXT" mode.
>
> After lots of tearing my hair out (well, at least tearing my cables out
> and trying other ones), I observed two things that make it go away:
>
> 1) Changing to USB ("REV DATA")
>
> 2) Turning *off* "TEXT DEC"
>
> I recorded the probleml, from line-out, with text decode on and off:
>
> http://www.dseven.org/k3/
>
>
> Why the text decode would cause crackle in the monitor audio, and why
> not in "REV" mode, I'm not sure... but I would like to be able to have
> the decoder turned on...
>
> ~Iain / N6ML
>
>
>
> _______________________________________________
> 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
>
_______________________________________________
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
