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FM Radio changing frequencies

H

helius

Jan 1, 1970
0
Hi all,


I want to know how it is possible to change the frequencies on a FM
radio to get the correct Police or other company/something's frequency
and listen to them. I live in Macedonia so I think it would be that
easy.


Cheers!
Aleksandar Kiselinov
 
D

Don Bruder

Jan 1, 1970
0
helius said:
Hi all,


I want to know how it is possible to change the frequencies on a FM
radio to get the correct Police or other company/something's frequency
and listen to them. I live in Macedonia so I think it would be that
easy.


Cheers!
Aleksandar Kiselinov

Possible? Yes.

Easily? That TOTALLY depends on the specific radio you're going to try
to do it to. Some models, it'll be as easy as carefully tweaking a coil
or fiddling with the tuning capacitor. Other models might require an
almost complete-from-scratch redesign.

Basically, you have to move the tuning range from the broadcast FM band
to whatever frequency your "target" uses. Doing that might be easy, or
it might be complex, or it might even be impossible, depending on your
radio's exact circuit details.

There's simply no way to tell in advance without having detailed circuit
information on the exact radio you're going to try doing it to.
 
S

Sjouke Burry

Jan 1, 1970
0
helius said:
Hi all,


I want to know how it is possible to change the frequencies on a FM
radio to get the correct Police or other company/something's frequency
and listen to them. I live in Macedonia so I think it would be that
easy.


Cheers!
Aleksandar Kiselinov
I have done it for my FM radio in the past, when we
still had NON-encoded police radio just below the FM band.
The problem was that the FM modulation depth was only 15 KHZ
instead of the 250 KHZ used by commercial FM stations,
so the sound was very soft and when turned up, the noise level
in between transmissions was horrible.
Today we only have encoded police/ambulance/emergency services.
 
I

ian field

Jan 1, 1970
0
helius said:
Hi all,


I want to know how it is possible to change the frequencies on a FM
radio to get the correct Police or other company/something's frequency
and listen to them. I live in Macedonia so I think it would be that
easy.


Cheers!
Aleksandar Kiselinov

A BFO might avoid the need to disturb the radio's internal adjustments.
 
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