[aprssig] HT-220 HT's for APRS

Dale Blanchard wa7ixk at earthlink.net
Thu Jul 19 23:13:37 CDT 2007

Robert Bruninga wrote:

> Because it uses the PTT mechanical switch itself to switch the
> antenna.  RF goes through the PTT microswitch.  You either have
> to put in a relay or devise some form of electronic switch with
> PIN diodes and 1/4 wave lines. (as best I remember it)...
> Bob, WB4APR
HT0220 use rgw ptt switch for a antenna switch.
Some later ones did have a antenna relay I think.
these were the ones with some external add ons.
I have the manual for the VHF radio And the UHF radio.

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