Tobin Fricke wrote:


is 9.6mhz crystal LO and use 455khz if can retuned to 400khz. that
works and uses fairly easy to get parts. That allows a diode
detector for zero beat against external sources and copy of the audio
without beats.


What is the 400 kHz used for?

Tobin Fricke

Incoming 10.000 MHz signal with a 9.600 xtal heterodyne oscillator will
create at .400 IF frequency. If you had a 9.545 xtal then a .455 IF
would add up to the 10.000 incoming freq. Six of one, half dozen of the
other. Thats based on an easy to find crystal.

You asked in another reply about the other nearby signals to 10.000.
There's plenty! The 9900-10000 freqs are in common use these days and
there's a few powerhouses. I recall a strong BBC outlet on 9985 I think
it is?

That said, on any receiver worth its salt they should not be an issue.
I have no trouble at all with WWV on 10 Mhz on even simple 1-2 tube
regen rcvrs at my location (KP4). Thats not a recommendation for simple
1-2 tube receivers in as much as to say that overloading is something to
be considered. You might oughta try listening on a real receiver first
to get a feel for the band and general reception capabilities at 10 MHz.
You can get one of those cheapo Chinese digital shortwave radios
nowadays for under $50, non digital for about $15-20. Not only will
they reveal how well WWV/10 is received at your location but you may get
a real-time example of overloading effects as well!


-Bill