| To: | <tentec@contesting.com> |
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| Subject: | [TenTec] Scout DC Supply Voltage sensitivity |
| From: | geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer) |
| Date: | Tue, 05 Nov 2002 20:51:09 -0600 |
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 -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only. |
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