[Elecraft] K3 + fldigi problem...

[Joe Subich, W4TV]

I suspect you are generating PTT via radio commands with FLDIGI
but DigiPan does not support radio commands.  With PTT from
SignaLink (the built in "VOX") and FLDIGI you can generate a
"RACE" condition.  Either disable the "command PTT" in FLDIGI
or disable the "VOX" PTT in Signalink and you will probably
eliminate the problem.

In some cases it appears that the transceiver CPU sees the "PTT
OFF" command via serial control but says "I still see a hardware
PTT so I will keep transmitting" but the controller is busy when
the hardware PTT drops and the hardware PTT change gets "missed."
I believe (but have not been able to create the necessary timing)
that the "hang" occurs when the hardware PTT drops less than 10
msec after the "PTT OFF" command.

73,

    ... Joe, W4TV


On 5/7/2011 10:21 PM, John Ragle wrote:
> Does anyone recognize the cause of the following problem?
>
> 1. First, the details of hardware/software:
>
>       (a) WIN 7 (32 bit) Dell XPS, on-board sound and also Infrasonic
> Quartet PCI card. Both sound cards are never active at the same time
> (e.g. the on-board sound is shut off in the BIOS when the Infrasonic
> card is being used.)
>       (b) SignaLink USB
>       (c) K3/100&  P3
>       (d) FLDIGI 3.21.9 7/or DigiPan. FLDIGI is run using RigCat and the
> K3.xml file.
>
>       The SignaLink can be run off either sound source. The problem is
> the same with either.
>       BPSK31 (e.g.) can be run off either FLDIGI or DigiPan. The problem
> only occurs with FLDIGI, not with DigiPan.
>
> 2. The problem:
>
>       (a) Transmission initiates correctly with both FLDIGI and DigiPan.
>       (b) When transmission is terminated with FLDIGI, the K3 is left in
> "TX" mode -- that is, the red LED under the Power switch remains on,
> although the SignaLink powers down properly and the PSK idle carrier is
> no longer transmitted.
>      (c) Pushing any front panel button on the K3 changes it over to RX mode.
>      (d) When transmission is terminated with DigiPan, the K3 changes
> over to RX mode properly.
>      (e) In either case, during transmit, things are working OK -- one
> can proceed with a QSO.
>
> John Ragle -- W1ZI
>
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