David,
It is a DIY process these days:
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Weekly Satellite Report
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.
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Note that there is a brief but noticeable delay between keying your transmitter, and the satellite transmitter coming up. A quick "kerchunk" will not work to see if it is up. Use a couple of seconds with 74.4 Hz to arm the bird, and then switch to the other PL. From there, you can tell when it comes up.
Alan WA4SCA