I also see this infrequently with my Flex 6600 (v2.4.9) & Win 10 (1803) 
connected via CAT/DAX.  Can’t correlate it with anything.  I usually let the 
cycle pass and it works fine on the next one.


> On Dec 14, 2018, at 3:58 PM, Morris Wideman via wsjt-devel 
> <[email protected]> wrote:
> 
> Same here and I have had this happen many times when preselecting (setting up 
> to call a wanted station) on a split and then TX but no audio so it not 
> necessarily a instant change that triggers this. I have two sounds cards 
> built in and add on and it does this with either as source. Both with cable 
> connected audio.
> 
> WA4MIT Morris
> 
> On Friday, December 14, 2018, 4:29:47 PM CST, Bill <[email protected]> 
> wrote:
> 
> 
> I have also reported this problem several times but have never received any 
> responses as to why this is happening. This is not windows specific since it 
> happens to me on both Mac and PC. It also isn't related to version number 
> since it happens with the older 1.9.1 and newer 2.0 versions. It happens to 
> me with a radio (FT991A) with a built in sound card and also a radio 
> (FT1000MP) using an external MicroHamUSB III interface. The only thing that 
> seems to apply is that it usually happens when I change my transmit frequency 
> slot. The transmitter keys but no audio. This is fixed by immediately hitting 
> halt tx then going back to enable. This isn't a very common occurrence but it 
> does happen to me at least several time a week, of course especially when I 
> am trying to work a new dx!
> 
> 73
> 
> Bill - AK6A
> 
> On Fri, Dec 14, 2018 at 2:01 PM Morris Wideman via wsjt-devel 
> <[email protected]> wrote:
> I agree this phenomenon has been with me for a long time now, stopping TX and 
> restarting resumes the audio. No one has provided a reason or fix. It does 
> not seem to follow any particular pattern that I have been able to pin down.
> 73 Morris WA4MIT 
> 
> On Friday, December 14, 2018, 2:20:19 PM CST, Al Pawlowski <[email protected]> 
> wrote:
> 
> 
> The occasional “no audio” on Tx has been around since I started using WSJT-X 
> a couple of years ago. Usually, just disabling Tx and reenabling fixes the 
> problem until next time - it has been so seldom for me that I have just 
> ignored it. I use an ANAN-100B with OpenSDRmrx now. However, I think this 
> happened when I was using a USB Signal Link and Icom 745.
> 
> Closing WSJT-X also recovers normal Tx. However, it does take some seconds 
> for all of WSJT’s tasks to stop after the window closes. OpenSDRmrx also 
> takes several seconds after its window closes to completely shutdown. Seems 
> like a Windows thing. I am using Windows 10 Home now on a 2.4GHz I5, but it 
> was the same on Windows 7pro and Windows 10pro on a 3.2GHz I3.
> 
> Al Pawlowski, K6AVP
> Los Osos, CA USA
> 
>> Date: Fri, 14 Dec 2018 18:28:58 +0000
> 
>> From: David Fisher <[email protected]>
>> To: WSJT software development <[email protected]>
>> Subject: Re: [wsjt-devel] TX function lost, then have Task Manager
>>      problem
>> 
>> I run a FLEX 6600 and I see it too.  This problem has been around for a 
>> while; it is not due to the WSJT protocol change. Since the transmitter 
>> engages we know that the transmit command is getting through the CAT system 
>> to the radio.  I?m not aware of any evidence of a problem like this 
>> occurring in other modes, SSB for instance.  That suggests that DAX is not 
>> getting the signal through to the radio.  It would be interesting to learn 
>> if RTTY and PSK users ever see an error like this.  I?ve never heard of one.
>> 
>> If all of that is true (we?re guessing now) then the WSJT/DAX channel 
>> interface looks suspicious.  Like Al, I?ve seen the stuck WSJT and have had 
>> to kill them off by hand.  I haven?t noticed the CPU spinning, but I haven?t 
>> looked for it.
>> 
>> Dave / NX6D
> 
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