wrote in :

I remember 3023.5, except I can't recall what it was for. Was it a
common HF tower frequency even though most of the equppage was VHF by
then? Perhaps you had a VHF receiver, but only an HF transmitter?
From the day I started the aircraft I flew either had no radios or
they had VHF transceivers (perhaps with only a few transmit crystals
and an analog receiver turner.) I remember my first IFR set well, the
Narco Omnigator. Did a lot of ATCS en route communications with that
equipment.

3023.5 KHz is 3.0235 MHz, and I doubt this is what you remember. 3023.5 Hz
is possible, since this is in the HF band, being just over 3 KHz.
MegaHertz band receivers weren't in general use in the 50's.

--
Regards,

Stan