FM frequencies that interfere with each other

[DXER1]

I know that some one might have asked about this already.
I have two radios near each other one is tuned to 98.7
and the other is tuned to 88.1 and both signals cancel
each other why is that and what frequencies do this ?
Every trip I take with my parents I will try to find
the frequency that interfres with the frequency that
they are on.

I love doing that <P ID="signature">______________
"I'm a gonna go to hell when I die!" Connan O'Brien

"yay boo, yay boo, it's lots of fun to do, if ya like it holler yay, and if ya don't ya holler boo!"

Connan O'Brien
</P>

 

[clichemoth]

> I know that some one might have asked about this already.
> I have two radios near each other one is tuned to 98.7
> and the other is tuned to 88.1 and both signals cancel
> each other why is that and what frequencies do this ?
> Every trip I take with my parents I will try to find
> the frequency that interfres with the frequency that
> they are on.
>
> I love doing that
>

That's due to the local oscillator.

Any two radios on FM broadcast frequencies 10.7 mhz apart (since the US uses spacing in .2 mhz increments, one would have to be off a bit) will do the same.

You can interfere with anything from 98.45 (if your radio tunes down to 87.75 to receive ch. 6 TV audio) to 107.9 (by tuning to 97.2).

And for God's sake, never do it on an airplane.

 

[Lee_T]

> > I know that some one might have asked about this already.
> > I have two radios near each other one is tuned to 98.7
> > and the other is tuned to 88.1 and both signals cancel
> > each other why is that and what frequencies do this ?
> > Every trip I take with my parents I will try to find
> > the frequency that interfres with the frequency that
> > they are on.
> >
> > I love doing that
> >
>
> That's due to the local oscillator.
>
> Any two radios on FM broadcast frequencies 10.7 mhz apart
> (since the US uses spacing in .2 mhz increments, one would
> have to be off a bit) will do the same.
>
> You can interfere with anything from 98.45 (if your radio
> tunes down to 87.75 to receive ch. 6 TV audio) to 107.9 (by
> tuning to 97.2).
>
> And for God's sake, never do it on an airplane.
>
It's like radio's acting like transmitters if you put
another radio near another you would hear a blank sound on
the frequency your interfering. I've done this myself before
I had one radio tuned to 92.7 FM with a radio station and
I received audio plus the interference on around 103.5 FM
but the audio would sound very low and distorted and of
course in mono.

Even some radios near a television set can even interfere
with each other as well, like try tuning your TV to channel
12 (VHF) and around 93 MHz on a radio close by at the same
time and you'll notice your television screen on channel 12
may go funny!

As for tuning to an AM radio from another AM radio nearby
you may get the similar result but as for an AM radio near
a television set you would hear a lot of buzzing type of
noises.

Take care.

From Lee
-Near Sudbury, Ontario, Canada.