Stewart,
There are many "sneak paths" for PTT between data mode software and the
Signalink.
The Signalink has its own virtual VOX circuit that produces a PTT line
closure.
Fldigi and whichever rig control you are using with it can produce PTT
via CAT command (through the RS-232 connection) without an actual PTT
connection.
DM780 can be set to do PTT through HRD, which is essentially the same as
above (PTT via RS-232 command).
I would suggest that you look for something that duplicates the PTT
operation in either the software or the Signalink. Once that is found,
I think that will be the answer to your problem.
73,
Don W3FPR
On 2/25/2015 5:30 PM, Stewart Bryant wrote:
Hi Don
Thanks for the reply.
On 25/02/2015 22:23, Don Wilhelm wrote:
Stewart,
By saying you are "using VOX in Signalink to control PTT" are you
saying that you are using the PTT output of Signalink to control
transmission? With a cable to the PTT jack?
Yes, that is how it is configured.
You mentioned the "RS-232 cable" which makes me wonder which of the
Signalink "Radio Cables" you are using. I am going to assume you are
using the SLUSBK3 cable which connects to the K3 reap panel audio
jacks and the PTT jack.
Correct.
If so, do you also have VOX set on in the K3.
No, I turned this off.
This is a common problem if both Signalink PTT and the K3 VOX are
active. Unplug the PTT cable from the Signalink and just use the VOX
in the K3, or turn off VOX in the K3 and use the PTT from Signalink -
your choice, but do not use both.
The key factor in avoiding the hang (which happens in both DN780 and
FLdigi seems to be not sending audio with the CAT cable connected, but
the off-off setting should surely cause the CAT control lines to be
ignored, shouldn't it?
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