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UT1HZM > PACKET 10.10.19 22:05l 40 Lines 1486 Bytes #999 (0) @ WW
BID : 56782_UT1HZM
Read: GUEST
Subj: Re: Thinking of packet supernode
Path: IZ3LSV<I0OJJ<VE2PKT<N3HYM<CX2SA<OK2PEN<OK0PBR<UT1HZM
Sent: 191010/1938Z 56782@UT1HZM.KREM.POL.UKR.EU BPQK6.0.18
>From ut1hzm%ut1hzm.krem.pol.ukr.eu@i0ojj.ampr.org Thu Oct 10 22:05:04 2019
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>From: ut1hzm@ut1hzm.krem.pol.ukr.eu
X-JNOS-User-Port: Telnet (ve2pkt @ 144.172.216.109) -> Sending message
Hi Peter and all.
>From: KF7PSM
>Hello all in the packet world. I've been thinking of how to address the
>problem with packet node rf port congestion where there are too many
>users on a particular packet freq at the same time.
It was solved years ago with extension to AX.25 protocol called "DAMA",
possible you can still search the docs.
In brief, any user stations never begin transmit before the Node sent to
each one user "poll packet" or "checking packet".
Some analogy to an SSB/FM phone roundtable mode, when main operator
give microphone to others members in sequence.
Of course there are always pros and cons in any scenario...
About your idea of multi-receivers node, its was done too,
on packet satellites in 1990's, it was even duplex mode (145/435MHz).
There was 2 or 3 receiver channels on SAT's Uplink,
with single TX (donwlink) channel to users.
For simple test of your idea, you can try setup two sets of modems,
use some second receiver antenna, then interlock PTT and TX lines
from two modems to single transmitter.
Also interlocking should be possible in BPQ software and/or in modem software.
73, Sergej.
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