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Originally Posted by Whirled One
BTW, I've seen some early RCA plugs that had very long center connectors; I don't know if that was typical of early versions of those connectors, or if that was just something RCA did on random pieces of equipment for whatever reason, or what.
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RCA had many irons in the fire, some of which were test equipment, movie theater audio, ocean-hopping HF communication services utilizing antenna farms, mobile communications products that competed with Link and of course Motorola, and who can forget RCA computers with virtual memory.
My point comes from the communication products area. In the 50’s and into the 60’s, RCA manufactured a family 15-watt output, 2-way radios called Carfone. There was for example a 450–470 MHz model, the CMU-15A in 1957. Those RCA’s never seemed to have the clarity to my then young ears as did an equivalent Motorola, but to my surprise, the Carfones used RCA plugs in the 15-watt RF path to the antenna. Those RCA plugs had very
short center connectors, perhaps a design consideration for the 50-ohm characteristic impedance of the antenna path.