On 8/29/21 at 5:04 PM, [email protected] (jan0
via wsjt-devel) wrote:
The original problem Phil was trying to solve, of course, was the
repeated-collision problem in FT8.
A few observations:
Wider bandwidth receive may be limited by the available
antennas. While most antennas will give decent coverage to an
entire ham band, some will not. (e.g. Highly loaded antennas
like a Little Tarheel on 80M.) Trying to decode more than one
band with e.g. a SteppIR antenna may push the signal strength
too low on the non-tuned band.
Claude's observation that we only have local information it
real. I remember during a RTTY contest noticing that there were
two stations CQing on the same frequency, one tuning permitted
decoding both of them. I don't think they knew about each other
because they were in each other's skip zone, but I could decode
both of them and worked both of them. Skip zones will apply to
FT8 as well. Listen before transmitting has its limits.
Another way to address this problem is to stop in the middle of
a 12+ second transmission to check the transmit frequency for a
short time. If this is automatic, the pause can be quite short.
When I do it manually, I have to listen for longer. Since FT8 is
designed for weak signal work, it can handle short dropouts.
Even with manual listening I frequently get the message through
in spite of the dropout.
73 Bill AE6JV
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Bill Frantz | There's nothing so clear | Periwinkle
(408)348-7900 | as a design you haven't | 150 Rivermead
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