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AO-50 now open to all



Greetings,
I have been advised that I can now publish the tone to Open AO-50 to all  
users as the power availability appears to be good.
To switch the transmitter on you need to send a CTCSS tone of  74.4  Hz.
the order of operation is thus:
 
 (allow for Doppler as necessary)
 
1) Transmit on 145.850 MHz with a tone of 74.4 Hz to arm the 10 minute  timer 
on board the spacecraft.
 
2) Now transmit on 145.850 MHz  (FM Voice) using 67.0 Hz to PT the  repeater 
on and off within the 10 Minute window.
 
3) Sending the 74.4 tone again within the 10 minute window will reset the  10 
minute timer.
 
Some additional information ...
 
The spacecraft repeater consists of a miniature VHF repeater with a  
sensitivity of -124 dbm, having an IF bandwidth of 15 KHz. The receive antenna  is a 
1/4 wave vertical mounted in the top corner of the spacecraft. The receive  
audio is filtered and conditioned then gated in the control electronics prior to  
feeding it to the 250 mW Transmitter.
The downlink antenna is a 1/4 wave mounted in the bottom corner of the  
spacecraft and canted at 45 degrees inward.
 
73
Robin Haighton VE3FRH
President AMSAT-NA
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