Add VOX to CS radio to better support FT8

Adam Rong
 

Gang,

The VOX circuit is very simple one like this:

I changed 47k to 10k to shorten the hold time.

Here is how I modified my radio (actually it is a crystal controlled FT8 radio but you can do the same for your CS radio as long as you change the mode to Upper Sided Band).
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Thanks,
Adam

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