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Question about auto antenna cable and connectors
Hi,
This is not about ham radio, but rather a general question about the type of cable and connectors that were found between the antenna and the AM radio in GM cars in the 60's. I'm trying to locate some technical information about the cable and a source for the cable and connectors. I have an old airplane autopilot system that uses tuned circuit to sense changes in the airplane's attitude and the position of the control servos. Distributed variable inductances and variable capacitors combine to establish the resonant operating frequency of the system. The components are connected together with specific lengths of cable and the service manual points out that the lengths are critical because of the added capacitance of the cable and connectors. The cable is marked as follows: "I. T. & T. Federal Cable R.E.C." It is a shielded cable with a spiral wound center conductor that looks very much like the antenna cable I remember finding in GM cars in the 60's. It also has the same type of connectors. There is a center pin for the center conductor and a metal sleve that extents back over the cable and makes a connection with the shield and chassis of the radio. Friction holds the connector in its mating socket - there are no threads, just a couple of splayed out areas on the sleve. I was hoping one of you might be able to point me to a source of technical information about this cable, such as the capacitance per unit length, etc. The one piece I have measures about 10.5 pF / foot or 415 pF / meter, but my measurements may not be all that accurate. Also, a source where the cable and connectors can be found today would be appreciated. Thanks in advance for any help. Ronnie, N5CSE |
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