No uplink operations occur on 145.80 to reduce the risk of inteference to the ISS downlink for school contacts. ISS did have packet downlinked on 145.80 also (yet another uplink) but was migrated to 145.825 to support operations with other digital satellites (like PCSAT).
Kenneth - N5VHO
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From: [email protected] on behalf of Ronald G. Parsons Sent: Sun 12/7/2008 1:59 PM To: amsat-bb Cc: Kenneth Ransom Subject: [amsat-bb] ARISS downlink frequencies
ARISS currently has four modes, Packet Radio (1200 and 9600), Voice, Cross-band repeater, and SSTV. All modes use 145.800 MHz as the downlink frequency except Packet which uses 145.825.
These last and next few weeks have (and will be) very exciting as all these modes are being used. I currently keep several programs running just in case a mode change occurs. I am using Ham Radio Deluxe for SSTV, AGWTracker for Packet, and SatPC32 and SatPC32ISS for frequency control for all modes with my Icom IC-910H.
Why couldn't Packet operate on 145.800 simplex instead of 145.825? Then one could just listen to 145.800 and tell which mode is being used. Currently I must switch between 800 and 825 if no mode is apparent.
Ron W5RKN _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb