Re: [TenTec] Scout DC Supply Voltage sensitivity

["Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>]

The classic LM7810 needs 2 to 2.5 volts minimum drop. When the input
voltage gets too low, the regulator acts as a constant voltage drop, so
any ripple on the input shows on the then unregulated output. The 2940
probably only needs a half a volt. Its easy to loose that margin with
poor connections at the radio power connector and fuse holders.

73, Jerry, K0CQ
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Reproduction by permission only.