[Elecraft] K3 Locks up in Transmit in data mode.

[Don Wilhelm]

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?
>