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AN/TRQ-35 High Frequency Radio Chirpsounder

Description. The TRQ-35 Chirpsounder is used for frequency management of high frequency (HF) radio circuits by determining which frequencies will propagate best, are not being used, or have low noise. It lets the Frequency Manager know which frequencies provide the best path between specific locations on a real-time basis. The transmitter is placed at one end of an HF circuit and transmits a carrier wave signal which is swept upward in frequency from 2 to 30 MHz in 4 minutes. The receiver is placed at the other end of the circuit. When properly synchronized, the receiver is capable of receiving all of the radio energy emitted by the transmitter that ionospheric propagation permits. One receiver can be synchronized with up to three transmitters.

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