WWV_FET_CONVERTER

Published:2009/7/16 3:30:00 Author:Jessie | From:SeekIC

Receives WWV on 2.5, 5, 10, 15, ver operating and 20 MHz using modified transistor AM broadcast receiver operating straight-through for for 2.5.MJz reception and serving as IF amplifier for converter when tuned to higher WWV and WWVH frequencies. Only two crystals are needed because each allows reception of two WWV frequencies; thus, 10 and 20 MHz, are image frequencies when receiving 5 and 15 MHz. Loopstick antenna, of radio is replaced with small slug-tuned coil L6 to use 2.5-MHz image frequency when radio is tuned to 1590 kHz. Converter uses –dual-gate MOS FETs in RF stang Q1 and mixer Q2, with JFET Q3 as oscillator Antenna is short piece of wire. -H. Olson, Five-Frequency Receiver for WWV, Ham Radio, July 1976, P 36-38.



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