Ev,
I transmit WSPR, FST4W, FT8, FT4 and MSK144 using a MP3 audio file and
precisely control the TX timing with a script.
If you were only 1 ms "off" from "exactly 1-minute" your could run the
same audio for 2000 transmissions or 33.33 hours.
If you plan to implement this in hardware only then a watchdog timer
can be used to provide the synchronization every 33.33 hours.
Opera is a simple weak signal mode which requires no synchronization and
is (machine decodable).
WSJT-X MSK144 is a mode which requires no synchronization and is
(machine decodable).
Tim N4WLO
On 5/19/2024 7:42 AM, Black Michael via wsjt-devel wrote:
The other thing to remember is combining audio on multiple
transmission you have to decrease the power on each transmission.
Same thing happens the Fox/Hound mode in WSJT-X. Two transmissions at
the same time need half-power on each to combine them for example.
So you'd have more power out of your beacon by playing round-robin.
If you run FT8 say on the top of the minute (and bottom) then squeeze
your other modes into the 15-second intervening period that would work.
Otherwise you'd have to have a GUI control to enable WSJT-X to
transmit if you other modes take longer than 15 seconds.
Mike W9MDB
On Saturday, May 18, 2024 at 03:57:56 PM EDT, Lance Collister, W7GJ
via wsjt-devel <wsjt-devel@lists.sourceforge.net> wrote:
Hi Ed,
It sounds like you are at the forefront of developing a new beacon
network ;-) I
would suggest that you consider setting up your beacons to transmit FT
in the first
and third 15 seconds of each minute, with CW and SSB each in one of
the other two
sequences. As long as your transmitter is synced with UTC, people will
be able to
decode the FT8 sequences.
GL and VY 73, Lance
On 5/18/2024 18:37:28, Ev Tupis via wsjt-devel wrote:
> Hello all,
> Later this fall, I hope to install a constellation of multi-mode
VHF+ beacons. CW,
> SSB, and MD (machine decodable) all in the same transmission.
>
> My intention is to record the audio digitally (MP3) and drive a
multimode radio in
> "SSB" mode, playing it over-and-over.
>
> Is there a WSx mode that does not require the TXing and RXing
stations to be
> timeslot locked?
>
> I can always fall "back" to PSK31/63 or RTTY, but would like to
explore the WSx
> approach a bit before I do.
>
> If this is off-topic, I would be happy to receive off-list input, of
course.
>
> Thank you for the work that you do.
>
> Sincerely,
> Ev, W2EV
>
>
>
> _______________________________________________
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