The A. R. R. L. Antenna Book

The A. R. R. L. Antenna Book

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70 a€” This schematic diagram shows the circuit for a brake-delay system for protecting the Ham-ll rotator and antenna. ... SM 1M O-^V^ W^-O (A) + VDO 401l| 14 1 1 U2C tagt;a€” +VOD i +VDO Q +VOD X 06 I 4, 8 -H a€” vw-o+voo a–iROTATE- D1 , D2 a€” Light-emitting ... 1200 ohms, 10 mA; contact rating 1 A; 125 V ac; Radio Shack 275-003 or equiv. ... While pin 3 of U4 is high, the brake remains released, and the selection switches are disabled by the logic 1 on pin 9 of U3 and pin 13 of U3.

Title:The A. R. R. L. Antenna Book
Publisher: - 1984

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