Published:2009/7/21 22:20:00 Author:Jessie | From:SeekIC
Two MOSFETs serve with diode switching arrangement for selecting either upper or lower sideband. Circuit between gates couples oscillator to isolating output stage. Upper/lower sideband switch applies +9V to anode of switching diode that closes feed-back circuit for crystal to be activated. Output can be used as injection voltage in demodulation of incoming signal by product detector of transceiver or as basic carrier applied to balanced modulator for transmitting mode. Used in SSB transceiver made by Sideband Associates for radio marine communication in 2-23 MHz range.-E. Noll, MOSFET Circuits, Ham Radio, Feb. 1975, p 50-57.
Reprinted Url Of This Article: