[amsat-bb] Re: GO-32 and APRS working!
bruninga at usna.edu
Mon Sep 17 17:43:53 PDT 2007
> APRS is working on GO-32.
> Saw W3ADO sending text messages.
> "Fm W3ADO to APRS via 4XTECH* <ui pid=F0 LEN=40 > [18:27:41]
> > hello world. Bob just typing away...
I just left the receiver on the 435.230 (which is +5Khz)
downlink and heard the satellite out over the Atlantic. SO I
used HYPERTERM and just typed away.. With my OSCAR array and no
one else logged on, I got nearly 100% digipeats of everything I
typed. This was using the D700 in packet mode.
I also noticed that I could copy to the end of the pass while
still being tuned 5 KHz high right on the published center
frequency. Makes me think the satellite might actually be a few
KHz higher than published?
Also, since GO-32 is in "PTT" mode, meaning it does not keep the
TX on all the time, this means there is a key-up delay for APRS
UI packets. This is GREAT news compared to APRS via ECHO. This
delay means there is no problem for the D700 or D7 users in
seeing their own packets digipeated.
On ECHO, being full duplex and always on, the turn around on the
satellite was faster than the TNC in the D7 or D700, so you
could usually not see your own packets.
NOTE: Non APRS users, who want to "chat" in dumb terminal mode,
can use the simplest APRS format to make sure all the mobiles
and HT's can see them. That is, preceed each message line with
the ">" character. SO typing this:
Will display nicely on the D7 and D700 radio front panels. But
they will only see the first 20 bytes on the D7 and only the
first 28 bytes on the D700. But usually keyboard contacts are
short anyway.. Oh, and be sure your TNC UNPROTO is set to
UNPROTO APRS VIA 4XTECH, and 9600 baud of course...
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