Yup. Basically a two way radio modified to operate "full duplex" using tuned cavities (duplexer). I actually had a hybrid amateur radio, "2 meter" (VHF) transceiver on the SanDiego "WLV" repeater (still in operation!!) on Mt Otay, now as then!!
HOME
with an old GE "pre prog" tube receiver to hear the UHF downlink, so "in effect" it was "full duplex"
The 2 meter transceiver was the much hated GE "TPL" (transistorized progress line) nicknamed the "toilet paper line"
View attachment 1715199585
The "pre prog" was named AFTER the tube type "Progress line" came out. It was huge, heavy, and all tubes, and used either vibrator or dynamotor for high voltage supply.
