On 26/01/2014 23:51, Bob McCormick W1QA wrote:
Hi Bob,
Bill G4WJS wrote:
I suspect that what actually happened was that the message being sent
when you first clicked the "73" button changed from R+dB to the 73
message. Such changes of message are allowed during the TX period.
The rest of your description is consistent with that i.e. as far as the
program is concerned you changed your mind and switched to a 73 message
mid TX period. The shutdown of auto TX and the triggering of the log
window are following a valid 73 message being sent.
It is best to only select the next message after the TX of the previous
message (more normally after the QSO partners decode has completed),
there is no "TX message pre-loading" capability as you describe it.
Oops - my bad.
And correct me if I'm wrong - but I think in the WSJT 9 program when you
change the selection it doesn't change what is being sent. (I'm new to
WSJT-X and the HF world coming from EME.)
I've probably done this on quite a few QSO's - if it is changing the bits
being sent I must look like quite the LID!
I wonder then ... how does the decoder handle / tolerate this? (What did
the receiving stations see when I did this?)
If it is OK to do in the first few seconds of the transmission (switch to a
different message) and the other side gets it right - that's cool ...
otherwise I think that being able to change messages in the middle of a
stream <sic> isn't necessarily a good feature. (I guess I'd rather have the
buttons either inop or buffered until after the transmission completes.)
I'm not certain on the exact logic or decoder behaviour but I believe
that it is quite possible to change the outgoing message up to around
half way through the TX period (~+25s) and have the QSO partner decode
the latter message successfully.
I suspect that free text messages are least likely to be decoded when
started late as they have the lowest level of forward error correction,
but nevertheless solid reception for a complete period is not required
for a decode.
It also appears that the message being received at the end of the period
is most likely to be decoded.
So as you can see it is quite reasonable for the program to allow you to
change your mind at least part way into the TX period.
Bob W1QA
73
Bill
G4WJS.
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