AO-51 ECHO
Catalog number 28375
Launched June 29, 2004
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More info ( coming from
AMSAT HQ ) see below
Schedule and News from the Control Team, see:
http://www.amsat.org/amsat-new/echo/ControlTeam.php
AMSAT-Echo AO-51 turned on for general use in FM repeat V/U mode on 30
July 2004.
Some more info:
Analog voice downlink:
435.300 MHz FM
2401.200 MHz FM
Analog voice uplink:
145.920 MHz FM + 67Hz ( PL )
145.880 MHz FM QRP ( no PL ! )
1268.700 MHz FM + 67Hz ( PL )
Digital downlink:
435.150 MHz FM 9600 bps, AX25
2401.200 MHz FM 38400 bps, AX25
Digital uplink:
145.860 MHz FM 9600 bps, AX25
Broadcast Callsign: PACB-11
BBS Callsign: PACB-12
A little bit more about the V/U mode: up 145.92 MHz ( concerns RX3 ) plus 67 Hz PL ( 1
sec activates TXB 10 sec, 435.3 MHz down ) or 145.88 MHz ( QRP,
concerns RX2, no PL required ) Remark ! The Echo PL tone decoder turns on TXB and gates ( only during the
receiving of a PL tone ) the audio path. The system detects sub
tones ( for instance 67 Hz ) causing 1 kHz deviation without
problems. Sometimes ( concerning certain modes or experiments ) no PL tone is
required. The latest information on AO-51 can be found at:
http://www.amsat.org
Remark ! BEFORE you work
via the satellite: FIRST ( to avoid errors ) read the LATEST (
AMSAT ) news ( about schedules, experiments ). Also, you can
check the broadcast message on the digital downlink. If it says
the bbs is CLOSED then do NOT transmit on the uplink ! Schedules
are changing from time to time. Further, do NOT transmit at once
( or without monitoring the actual downlink ) ! First listen !
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