[amsat-bb] Be kind to our old lady AO-7
af5cc2 at gmail.com
Thu Jun 1 03:40:30 UTC 2017
Thanks for the information, that clears up one question I have always had.
73 John AF5CC
On Wed, May 31, 2017 at 9:41 PM, JoAnne Maenpaa <k9jkm at comcast.net> wrote:
> Hi John,
> It's a bit involved without having a white board or the use of hands to
> around but maybe I can state the principle in 25 words or less ...
> A transponder is pretty much an RF mixer where a local oscillator (LO)
> frequency is mixed with an input signal. The resulting output of the mixer
> is a combination of ...
> 1. the LO frequency (call it F1)
> 2. the originating input frequency (call it F2)
> 3. a resultant output of LO-input freq (F1-F2)
> 4. a resultant output of LO+input freq (F1+F2)
> Depending on which resultant mixer output you transmit you'll be inverted
> not inverted. Perhaps that is too simple of an explanation to make sense.
> More details thanks to google like this one:
> More experts around here will tell better :-)
> 73 de JoAnne K9JKM
> k9jkm at amsat.org
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