[wsjt-devel] FW: [WSJTX] WSJT-X 3.0.0 rc1 comments and #IssueReport - missing first Tx

[Reino T. <rei...@ko...>]

Hi, 

You may have followed this discussion on WSJTX group. 
The problem in short is that sometimes the first transmission of a message chain activates the PTT, but there is no audio signal.
Hopefully my conclusions are correct and this helps a bit to study the problem.

73, Reino OH3mA

-----Original Message-----
From: Reino Talarmo <rei...@ko...> 
Sent: Monday, October 6, 2025 12:08 PM
To: 'ma...@WS...' <ma...@WS...>
Subject: [WSJTX] WSJT-X 3.0.0 rc1 comments and #IssueReport - missing first Tx

Hi, many thanks to all answering my questions.

I try to make a summary of the observations about the missing first Tx mystery. I appended the subject to help identify easily any further discussion.

1. This is not a new issue in v3.0.0-rc1 but been there at least since v.2.7.0.
2. It is operating system or version independent, seen in Windows 10 and 11, MacOS and Linux including Raspberry Pi.
3. There seems to be no pattern, when it hits. A faint indication is that a high processor load may affect.
4. RFI as a general reason is ruled out, would have been too simple, hi!
5. The missing transmission can be evoked by hitting the Tune button and it continues normally to the end of the timeslot. 
6. After the missing Tx period the next one happens at random interval, typically after a long time.
7. Nobody has reported whether this happens also, when VOX is used for PTT, resulting a total missing first transmission.

I assume that there is no relation to the various power saving methods used in operating system. Unless also Raspberry Pi has a power saving mode?

It may be a resource management issue in some common operation system independent entity, QT as one possibility.

Next step is to allocate more resources to study it would be the normal scientific entity wish I assume.

May I ask some questions as I am basically a hardware man (discrete components and soldering iron) and programming is another field of expertise. Would it be possible to add into the wsjt-x another bug detection entity? Does wsjt-x have any knowledge about the audio connection state or audio output level? 

Hopefully my observations are correct. Any further reports are welcomed. 

73, Reino OH3mA