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

[David Fleming]

Hey Tom,

I suspect the S-Meter app is putting too much of a burden on the serial port. You could try using a lower poll rate, but you'll lose accuracy if you go below 10/sec. See if the problem occurs without the S-Meter running.

Merry Christmas!

David, W4SMT


--- On Thu, 12/25/08, tom kenville <tom.kenville at gmail.com> wrote:

> From: tom kenville <tom.kenville at gmail.com>
> Subject: [Elecraft] K3 --- stopped XMIT during SSB QSO
> To: elecraft at mailman.qth.net
> Date: Thursday, December 25, 2008, 10:53 AM
> 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
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