After reading the spec at
http://tracebase.nmsu.edu/hf/standards/MIL/188-110B.pdf I see from a high
level how the fixed frequency modem works. Table XIX in the document gives
a great summary. I have taken a snapshot of that table an posted it at
Bob,
Didn't you do the software development for this modem to run under Linux back
in 1999 or so?
Whatever happened to it and how would something like this perform on say, 6
meters where I would expect you could use it?
If amateur radio did get permission to use high baud rate modems on HF
This standard may be found at
http://tracebase.nmsu.edu/hf/standards/MIL/141Bn1.pdf .
The single frequency modem is 8FSK running at 125 baud, 3 bits per symbol,
375 bits per second.
A word is 24 bits. 3 bits are preamble, 21 bits are 7 bit characters.
Each 24 bit word is encoded into a Golay
--- In digitalradio@yahoogroups.com, Mark Miller [EMAIL PROTECTED] wrote:
Now how well this all works remains to be seen.
73,
Mark N5RFX
Hi Mark,
In the limited testing I've tried with image files, it works very
well, indeed. Perhaps we can try exchanging some images next time we
link.
List of ALE stations seen on 20 meters on Saturday so far:
WD8ARZ
N5RFX
WA3MEZ
WB6MLC
K5SKH
KN4HH
73---Bonnie KQ6XA
A few us will be on the air with ALE this weekend testing some new
things. If you would like to try a taste of ALE, please join us
Free PCALE software is available on HFLINK
I went searching in my archives for some testing that was done in May of
2002 with Packet on HF using different Baud Rates and shifts. MixW has the
capability of setting custom Baud Rates and Frequency shifts. Looking
through my notes I noticed that we started with 100 Baud and a 60 Hz
shift.
In the limited testing I've tried with image files, it works very
well, indeed. Perhaps we can try exchanging some images next time we
link.
Bonnie,
Great. Yes I have had some QRN here and the QSB has been a problem too.,
and none of the 8FKS signals I have seen have been super strong.
To be honest, using a high speed baud rate modem on HF and then encoding
it to
slow down the effective bps, seems the exact opposite of what is
normally done
with slower baud rate and higher order modulation to get the higher
throughput.
Rick,
The actual BPS rate for 188-110B is 7200,
