[amsat-bb] Community Survey Request -- crosslinks, multi-hop packet, and satellite DX
my.callsign at verizon.net
Sun Apr 2 22:54:54 UTC 2017
I like what I see so far on your initial proposal.
In the past, I have been involved with 2-HOP and 3-HOP packet attempts
using various combinations of the ISS, NO-44 and NO-84 when they were
all working on 145.825MHz.
Your proposal of using a 9K6 FSK 2-port_digi's on board three satellites
in the same orbital track resolves what I believe to be the main
challenges we faced in our 1200 baud experiment. If the footprints
overlap, the satellites should be able to talk to each other.
1) Since the satellites were in different orbits, there was Doppler
shift in the signal between them. In your proposal, doppler is minimal
for FM packet.
2) With your 2-port digi, the repeated packets between satellites will
not be interfered with by multiple up link signals. Improving the
3) I find that 9K6_FSK is as easy to copy as 1200baud, so efficiency in
channel usage is gained.
Once the operators acquire confidence in establishing basic 2 & 3 Hop
packet contacts, the other experiments and distance records you
mentioned will follow.
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