On 24/10/2019 20:15, DG2YCB, Uwe wrote:
During the current DXpeditions I‘ve observed repeatedly the following:
Signal strength dropped dramatically when number of slots was
increased. So far nothing special. But very often number of slots was
increased unnecessarily, because the existing slots were only filled
with one station each.
What is the reason? Less experienced operators? If so, wouldn’t it
make sense to automatically limit the number of slots that way, that a
new one is only opened when the existing ones are filled up with two
stations each?
Just a thought. What do you think of such a modification?
73 de Uwe, DG2YCB
Hi Uwe,
the basic mechanism of FT8 DXpedition mode is that up to five Hound
stations can be worked in parallel by using up to five Fox slots
respectively. Note that there are not two Hound stations per slot at the
same time, what does happen is that an optimization to sign off with one
Hound simultaneously with starting a QSO with a new Hound is available.
This is allowed by a special standard form message that prints "<call-1>
RR73; <fox-call> <call-2> <rprt>". This is not arbitrary parallel
working of two Hound stations per slot, but only a partial overlap of
two QSOs.
The number of Fox Tx slots is controlled by the Fox operator by setting
a maximum number of slots allowed and by the number of outstanding Hound
stations they have queued up (by double-clicking their call decodes) to
be worked. It is up to the Fox operator to determine if propagation
conditions are good enough to warrant extra Tx slots and the necessary
reduction in output power per slot resulting.
73
Bill
G4WJS.
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