[Boatanchors] Re Bearcat Scanner Crystal Type

[peter markavage]

The formula for computing exact the fundamental crystal frequency for a
Bearcat III for use on the "H" band (146-174 MHz) is as follows:

(Receive frequency) minus 10.8 MHz (the IF); then divide this answer by
3; the final answer is the actual crystal frequency

So: 162.475 minus 10.8 equals 151.68; divide by 3 and the answer is 50.56
MHz 
Sometimes the manufacturer will mark, etch, or stamp this frequency on
the crystal. Sometimes crystal manufacturers, when making crystals
designed for specific receivers/scanners, will just put the actual
receive frequency (in this case 162.475 MHz) on the crystal.

The thing to remember about Bearcat/Electra type scanners is that most,
if not all of them, used a 10.8 MHz IF rather than the more standard 10.7
MHz IF.

Pete, wa2cwa


On Sat, 12 Feb 2005 23:38:50 -0500 "Duane B. Fischer, W8DBF"
<dfischer at usol.com> writes:
> 
>         
> Hi All,         
>         
> Can any of you tell me exactly what crystal I need for the Bearcat 
> scanner from
> 1974?        
>         
> The one gentleman who sent me one for 162.475 MHZ took one out of a 
> Robbins
> scanner. hence it was not dead, just not interchangeable.        
>         
> I have the manual here for it, but it will not scan good enough for 
> my software
> to convert it into an intelligible document. Hence I am afraid I 
> might get the
> type of crystal wrong doing it this way. If one of you can give me 
> the right
> info, it would certainly be appreciated. Thank you.        
>         
> Duane W8DBF