On 11/06/2019 16:06, Black Michael via wsjt-devel wrote:
S9A has been hard to work...seems what is happening is they will call
"CQ" and then answer two slots and the power drops and won't see them
again. Or I'll see two decodes from them and they disappear
again...all very likely due to the power drop from multiple slots.
I've seen them a few times when they transmitted one slot in their
QSOs...but never saw them do two slots....which I'm sure they're
doing. Perhaps somebody else has some logs to show their activity to
be sure.
There has to be some logic we can put in there. For example.
#1 After callling CQ restrict > 1 slot for a while or use incoming
signal reports to determine if # of slots can be increased at that
point -- so somehting like -12 or better before slots can be increased
during that QSO.
#2 Maybe do the same for each slot level.
What's happening is a lot of ops aren't seeing the RR73's. So they
keep calling over and over again...even though they've been logged.
Just throwing some idea out there to start a discussion of a better
way to manage the power level from the Fox's.
de Mike W9MDB
Mike,
look at it from the Fox operators point of view, they know how many QSOs
they are logging and if increasing the number of slots increases the
rate then that is the best thing to do. Weaker stations will have
trouble but when the propagation improves for them or the rate drops and
they reduce slots then they should get a chance. It is up to the Fox
operator to manage the pile up and other things in their control like
the aerial direction etc..
The optimum solution would probably be an asymmetric mode where multiple
QSOs can be held using a single MFSK message. Perhaps 3 times as much
information for the Fox with messages like:
K1ABC -10; W9MDB -05; G4WJS RR73; K1JT -06; K9AN RR73; DE P5RAREDX
Just sending the Fox call once per period would give a considerable
information density advantage over the current multi-channel Fox
transmissions. So one MFSK signal for the Fox utilizing 3/4 of the time
and many standard FT8 signals for the Hounds. Another approach could be
to use a wider bandwidth and symbol rate for the Fox staying with
symmetric 15s FT8 T/R periods. The latter could be particularly
attractive when using GFSK modulation to reduce the sidebands and
optimize the Fox waveform inside a typical SSB bandwidth, although
narrow band digital mode band planning would probably limit to 200Hz or
less and the commensurable signalling rate. Even a 200 Hz width FT8 Fox
mode variant could allow several QSOs simultaneously with Fox messages
in the style above.
73
Bill
G4WJS.
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