[maple_leaf_eh]

You posting brought back memories (mostly bad). The C42 installation I used in 1976 had a 3-sided sheet metal shelf that mounted above the radio. Each of the assorted control boxes were mounted there. The only other pieces were the Antenna Tuning Unit on a base behind the spare tire carrier. This resembled but was different from the RT524 Antenna Mounting Unit base.

The C42 has no noise acctuated squelch. Entire generations of radio operators have hearing loss from listening to that blasted growling in one or both ears! The switch sequence starts with the Power Supply Vibrator moves to the right. But the job isn't done until the operator gets the needle on the ATU swinging from left to right centred between the dots while the pressel switch is depressed.

When we received the RT524 and PRC77 sets, absolutely no one was unhappy to get rid of the C42s and PRC510s.