[R-390] R390A Turns Counter BFO option?

[Cecil Acuff]

Well...that must mean there are other circuit mods as well increasing the 
range of the BFO...isn't that beyond the range of the standard BFO?

Interesting...

Cecil
----- Original Message ----- 
From: "Nick England" <navy.radio at gmail.com>
To: <MillerKE6F at aol.com>
Cc: <r-390 at mailman.qth.net>
Sent: Sunday, March 13, 2011 1:08 PM
Subject: Re: [R-390] R390A Turns Counter BFO option?


> FWIW -From "Cryptologic Collection Equipments" NAVEDTRA 10251 (1977)
> http://www.navy-radio.com/manuals/crypto-equip.htm
>
> BFO PITCH.-The BFO PITCH control
> varies the output frequency of the BFO above
> and below 455kHz. The normal R-390A BFO is
> designed to vary by 3kHz above and below
> 455kHz. Many of the R-390A receivers with
> which you will come into contact have a
> modified BFO pitch control, called a
> MICRODIAL. This modification enables the
> BFO to be varied over a 26kHz range (13kHz
> above and below 455kHz.)
>
> cheers,
> Nick K4NYW
> www.navy-radio.com
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