Quite a few crystal oscillators in a receiver are running on the third-harmonic of the crystal's fundamental frequency. The local oscillator in consumer scanning receivers was calculated with this formula:

The formula generated a local oscillator frequency that was the first IF frequency (10.7 MHz) after the mixer stage.

On 11/6/2022 12:33 PM, Andy Brian wrote:

I'm looking for good source of crystals between 156.5 and 156.600MHz for build experimental
linear transponder. Please for any got information or some other solutions.
I received a few from marine scanners but it seems not 156Mhz

73 de JoAnne K9JKM
[email protected]
BM DMR TG 98006