[Milsurplus] NAF 68304 Nay Beam Filter

[WA5CAB at cs.com]

The nominal audio modulating frequency of the A-N range was 1020 CPS.

In a message dated 5/31/2007 10:16:43 PM Central Daylight Time, al at ar88.net 
writes: 
> D C *Mac* Macdonald wrote:
> >I am not absolutely certain, but I believe that the tone
> >frequency used was actually 1020 Hz, supposedly because
> >research had shown that a tone of that frequency gave
> >the strongest response in the average human ear for a
> >given actual sound pressure.
> >
> >Mac, K2GKK/5
> >Oklahoma City
> 
> I don't know about that, but 1020 is an even multiple of 60Hz making it 
> easy to calibrate from the AC line frequency.
> 

Robert & Susan Downs - Houston
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