Hi Bill and all,
The point I didn't consider was that two reports cannot be combined in one slot. Means, when there are currently no RR73 messages, the free capacity of those slots will be unused. Somehow unsatisfactory, but logical. 73 de DG2YCB, Uwe ____________________________________ German Amateur Radio Station DG2YCB Dr. Uwe Risse eMail: <mailto:[email protected]> [email protected] Info: <http://www.qrz.com/db/DG2YCB> www.qrz.com/db/DG2YCB Von: Bill Somerville [mailto:[email protected]] Gesendet: Freitag, 25. Oktober 2019 01:27 An: [email protected] Betreff: Re: [wsjt-devel] F/H mode: new slots only when the existing ones are filled up? 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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