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120_150_MHz_FOR_TRANSISTOR_RADIO

2016-05-06 13:51  
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120_150_MHz_FOR_TRANSISTOR_RADIO
Values shown cover bands for aircraft radio, 2-m amateur radio band, and other services. Circuit is regenerative converter, with incoming signal tuned by La-C2 and mixed in 2N2222 or equivalent transistor connected as oscillator with frequency controlled by L3 and C7. Difference frequency is adjusted to fall in standard broadcast band, for pickup by radio when converter is mounted close to ferrite loop. For local stations, antenna of converter can be 19-in length of wire. L2 and L4 are 100-μH chokes or about 20 in of fine wire wound on 100K resistor. -S. Kelly, Simple VHF Monitor, 73 Magazine, July 1976, p160.