In the US Thor-25 may be used
on any frequency allocated for digital modes.? I have not
assigned an RsID for the mode but will do so after the mode
specification is finalized.? I am experimenting with smaller
flush_length bytes to reduce transmission overhead; 20 seem to
work as well as 40.? These are required to avoid decode errors
at the beginning of the data stream.
You can use a video text at the beginning of the transmission to
assist others in recognizing the mode:
David
On 12/6/24 08:40, Bobby Chandler via
groups.io wrote:
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Dave,
What freqs for Thor25?
Bobby/N4AU
On 12/6/2024 7:49 AM, Dave wrote:
Thanks Barry.? I would
appreciate your doing some real world testing with THOR-25.?
My bench tests show it to give >99% copy with
PathSim/LinSim Mid-Latitude Disturbed simulation.
SCAMP is intended to be compatible with an Arduino H/W
implementation of the same signal.? The developer intends
this to be used for emergency comms with very low power
field units.? He provided me with a prototype of the
hardware implementation.? I do not think he designed the
signal as an FT8 replacement, but there are some who are
testing it as such.
Davd
On 12/6/24 07:07, K3EUI Barry via
groups.io wrote:
Dave
?
We who use THOR appreciate all of the work you put in to
make it better.
?
My experience using THOR22 on HF NBEMS nets (PaNBEMS,
MidAtlantic NBEMS) on 80m and 40m in the early morning hours
is that it can copy checkins much faster with fewer data
loss than other modes.
?
THOR has the advantage of being able to copy even if you
are mistuned (something rookies often do).
?
We found THOR11 works well if the band is crowded (like a
RTTY contest) or if there is severe fading.
THOR22 is our common checkin mode, with THOR32 our common
traffic mode.
?
?
So how might THOR25 fit in our nets on HF?
We advise participating stations to turn off the digital
squelch and to disable any ¡°noise reduction¡± or ¡°noise
blankers¡± or notch filters in their modern radios.
?
MFSK22 and 32 also work well, but if mistuned by a tone
(15 Hz) we fail to copy.
?
?
?
Many of us were wondering if any future work will be done
to have the OFDM modes return?
We had a lot of experience with OFDM narrow modes on 80m
and 40m and noted that if the S/N was not above some minimum
value, we got lots of missed data.?
?
?
And what about SCAMP?
A few of us have been playing with that new (alpha) mode
on 80m and 40m.
SCAMP is interesting to watch - and very narrow
bandwidth.
Is scamp competing with ft8 as a chat mode (slow speed)?
?
agn, TU Dave
de k3eui. Barry
Pa NBEMS and Mid-Atlantic NBEMS net manager
?
?
Dave, W1HKJ