[ao16aprs] Re: ao16aprs digest: September 05, 1999

["Jeff Griffin" <kb2wqm@cyberenet.net>]

Good evening SIG. Learned alot about this over the last week or so. The psk
pacsats are easily used for an aprs to internet satgate,  in an unattended
oscar class satellite station. I have a few observations I will share with
the group. Running APRSPLUS 1.99v on a proxy server,  32 meg of memory
configured in APRSPLUS. Had some difficulty with the proxy server
configuration, but with the help of Brent
 kh2z finally got it running. Built two tnc configuration files for ao16 and
lo19. Once the computer connected through the proxy it was unattended for
both passes. I was present only to send unproto's and to monitor the various
data streams. mostly All went well, APRS crashed once, so I increased the
memory to 40 meg. For some reason I didn't see my mobile being reported in
my traffic or position window. I saw it come across the tnc, then the tcp
window.  One of the problems I see is stripping off the normal satellite
traffic, some of it contains binary data which aprs s/w interpolates as
line feeds, carriage returns,  etc. This will have to be addressed by the
various aprs software authors. Or can it be filtered by existing s/w setups.
I might be able to clean it up here , I'm not sure. I plan on doing this
again sometime next weekend. So we can try some different configurations.
It was fun. Anyway here is my input on Bob's questions.

 1) Anyone running Mac/WinAPRS or APRS+SA can automatically be a gateway
by just enabling APRServe and dialing up his ISP..  (Thus we may not  be
fully dependent on dedicated permenent gateways, but anyone at any  time can
do it easliy)...

this is true, if you want to gate to local rf, it would get more
complacated. Anyone want my AEA DSP2232 tnc config files, let me know. Also
I will set up the PacComm  NB96 sat set for the next test. I think these two
are the only ones to use. You could use a moded tnc(for manchester) with a
PacComm PSK modem also.

 2) 50w to a mobile whip will work fine

this is true, I get better then 40% u/l , and I didn't even check the deviat
ion yet !

 3) Typical TNC's are PSK-1, DSP-12, AEA-2232

 Any other TNC's?

for the downlink see above. for the uplink, I talked to Kantronics last week
and was told that older KPC-3's , and 9612's (not plus models) have a
seperate clock chip, so they could be easily modded for Manchester encoding.
If I had one handy I would work with Kantronics to get it working. The newer
Plus models  have the clock intergrated into the cpu. There must be
thousands of kpc-3's floating around. I'm going to look for one myself, for
the mobile. One more thing watching the data stream on LO-19 , three of us
were hitting the sat at the same time , so it looks like it buffers the data
to be unproto'd very well.  The guys who designed the s/w ten years ago did
a heck of a job. I just want to thank them for their work. this whole system
can become a very valueable part of the APRS worldwide network. If IO-26
becomes avaliable , even better.


73 Jeff kb2wqm





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