[Elecraft] K3 --- stopped XMIT during SSB QSO

[Tony Fegan VE3QF]

Hi Tom,

	I think you will find it is the "Nice little S-meter" that is causing 
your trouble. I had a similar experience with transmit lasting for 12 
seconds and then being unresponsive until I switched VOX on and off. I 
sent my findings to Don WB8YQJ. In his reply he states:

	"As for the VOX, that's a new one to me, and I suspect
it's because I am having to be aggressive with the
threshold sets, due to the K3 firmware. Earler
versions of the program that don't set the threshold
probably don't suffer from this".

	I also had the odd DSP error to which he replied:

	"No worries about the DSP error, I am using an undocumented
command to read the S-Meter and until a normal command
is available that will pop up on rare occasions".

	Hope this helps

73
Tony VE3QF
K3 #137


tom kenville wrote:
> Last evening I had an annoying problem with K3.  It would stop 
> transmitting any signal, even though the red xmit light was lit.
> 
> The K3 was driving a 30L1 linear with about 45 watts, a pretty safe 
> level, and no ALC connection.  I had LP-BRIDGE running, with HRD, SDR_IF 
> and the nice little S-meter display application running.  SDR_IF links 
> direct to HRD.
> 
> I was running PTT mode, keying with the XMIT button.
> 
> I would talk for about 30 seconds, and the signal would just quit. 
>  Happened many times, to the point I took the rig offline.  Each time, 
> the red light still glowing.  Pressing XMIT twice to toggle PTT off/on 
> would get my signal back. But the same symptom would recur a bit later.
> 
> I'd been running the K3+30L1 and HRD (no LP-BRIDGE) earlier in evening 
> for about an hour in the same PTT fashion, so I know that setup worked FB.
> 
> I will do some further experimentation, but I suspect that there might 
> have been too heavy a load on the serial interface, causing some Ucode 
> confusion in K3.
> 
> The serial setup is using the Elecraft supplied USB-serial adapter 
> cable, at 38Kbaud.
> 
> Any thoughts ?
> 
> TNX -- Tom  W6TJK
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at 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