with its intermediate frequency, has been used in virtually all radio receivers.

Examples

* down to c. 20 kHz, 30 kHz (A. L. M. Sowerby and H. B. Dent), 45 kHz (first commercial superheterodyne receiver: RCA Radiola AR-812 of 1923/1924), c. 50 kHz, c. 100 kHz, c. 120 kHz
* 110 kHz was used in European AM longwave broadcast receivers.
* 175 kHz (early wide band and communications receivers before introduction of powdered iron cores)
* 260 kHz

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