Hi Jeff,
You could answer all your questions, learning much more while doing so,
by experimenting on your own. No need for RF; just use audio between
two computers or two instances of WSJT-X on one computer.
Having said that, I'll provide a few short answers:
On 2/20/2021 8:38 AM, jeff millar WA1HCO wrote:
What percentage of bits are needed to produce a valid decode? I'm asking
because sometimes I may start a transmit session some seconds late.
Depends on the mode. Different modes in WSJT-X have different code
rates. All are available in the User Guide. Typical answer: half a
message at high SNR is often enough.
Does it make a difference if the transmission is not started (Rx gets
noise) vs started but changes message partway through? Sometimes I may
double click a call some seconds after a CQ is started.
You will probably be decoded.
As an aside, I've noticed that my new very fast PC gets the decodes done
much quicker and there is more time to view, think, and then select the
transmit message.
Not for the werid question... If the signals are very strong, can I
send RR73 for the first half of the message and the initial message for
the next contact in the same cycle? In other words, is it theoretically
possible to work two stations at once?
Not a good idea.
A variation on the last question, if signal are strong (BER is low) and
the tx message changes halfway through, will the receiver decode both
messages?
No.
-- Joe, K1JT
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