RNAV vs IFR GPS

"Stan Gosnell" wrote in message =
...
wrote in :
=20
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?=20
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.=20
=20
3023.5 KHz is 3.0235 MHz, and I doubt this is what you remember. =
3023.5 Hz=20
is possible, since this is in the HF band, being just over 3 KHz. =20
MegaHertz band receivers weren't in general use in the 50's.
=20
--=20
Regards,
=20
Stan
=20
No, Stan, it was 3023.5 kHz AM, in the HF Aeronautical Mobile band,
which spans 2850-3155 kHz even to this day.
3.0235 kHz would be VLF, with a 100-km wavelength!
As VHF gear began to be emplaced in the 1950s,
they couldn't just suddenly abandon HF communications.

And as Sammy said, it was either the common Tower frequency,
or the common "Radio" frequency (meaning Flight Service Station).
I *think* 3023.5 kHz was for calling "Radio", who could respond
either on VHF or on the local LF/MF 4-course Adcock Range station.
If that's right, then 3105 kHz probably was the frequency for calling =
the Tower,
who could respond on the fixed frequency of 278 kHz as standard,
or on a small number of alternative HF frequencies if other towers were =
nearby.

Whew. I'd have to dig through some old stuff to remember this exactly,
but I'd lay money on Steven P. McNicoll's ability to turn it up easily.
---JRC---