An Ultra-High Frequency Superheterodyne Receiver for Direction Finding

An ultra-high frequency superheterodyne receiver, simple in operation, having high sensitivity and stability, was constructed primarily for direction finding on 1.67-meter waves. The 220-kilocycle intermediate frequency amplifier using resistance coupled high μ television type tubes has a constant gain of 110,000 over a 110-kilocycle band. This flat intermediate frequency response allows for any slight variation in the oscillator or signal frequency, due to temperature variations etc., without affecting the output of the receiver. A high gain and a high signal to noise ratio make the receiver well suited for direction finding observations by the null point method.