HF_VHF_MARKERS

Published:2009/7/21 21:05:00 Author:Jessie | From:SeekIC

Provides markers needed for most amateur radio bands, including 30 and 300 kHz for VHF FM operation and 10 and 100 kHz for 2-m FM operation. When LED is on, outputs are 1 MHz, 100 kHz, and 10 kHz. When LED is off, outputs are 3 MHz, 300 kHz, and 30 kHz. Uses 7404 TTL hex inverter as crystal oscillator, with 2-8 pF trimmer for zeroing crystal with WWV. All 7476 TTL dual JK flip-flops are connected to divide by 3.-F. E, Hinkle, Inexpensive HF-VHF Frequency Standard, 73 Magazine, April 1976, p 62-63.



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