That wasn't uncommon. They call it "RF Speech Processing" as opposed to audio processing which is usually just compression. This is exactly how the Drake SP75 works. There were a number of manufacturers who successfully used this scheme. I've got a very old Comdel that actually uses L/C filters. Never had it on the air, but someday...
73
-Jim
NU0C
On Sun, 21 May 2023 08:26:55 -0700
"jerry-KF6VB" <jerry@...> wrote:
My old Kenwood TS830S had a great compressor. It was basically an
embedded
SSB transceiver inside the transceiver. Audio was mixed up to an IF
frequency - IIRC 455kHz. Then passed through a ceramic filter. Then
clipped. Then filtered again and mixed down back to audio.
Jim Shorney