[amsat-bb] Re: SO-50

Bruce Semple bruce.semple at verizon.net
Sat Aug 28 09:15:56 PDT 2010

Dave -
Thanks for the reminder  -
I forgot about the 74.4Hz "turn on" tone -
I had a quite pass last night -- I was hesitant to transmit until
I heard somebody on the downlink.   Then I tried a test call (with 
the 67hz on) - and
did not hear my downlink -- adding to the puzzle.

jesh - yet another "middle age moment"

At 08:31 PM 8/27/2010, Dobarrows wrote:
>Sometimes I have not heard SO-50 on late night passes.  Then I key up
>my transmitter with a 74.4 hz tone.  After that, I key my transmitter
>on and off with a 67hz tone while tuning the receiver set in cw mode
>until I find a carrier that goes on and off with my keying somewhere
>near where I expect the downlink to be.  I then give my station ID and
>change the receive mode to fm.  I know that SO-50 is alive and well.
>I don't know if it is well understood, but SO-50's downlink will only
>be on as long as there is a signal in the uplink with the 67hz tone on.
>You let up on the mike and the downlink ceases until someone else
>transmits.  AO27 and AO51 have  continuous carriers when turned on so
>they are easier to locate when there is little activity. (Little
>activity doesn't happen often here in North America on AO27 and AO51).
>Dave W8IJ
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