On Wed, Apr 30, 2008 at 2:26 AM, Ralph Shumaker <[EMAIL PROTECTED]> wrote:
>
>
> I remember listening to one radio station (FM 107.9 - a weak signal from
> San Clemente), but every once in a while, it would cut out and go completely
> blank (frequently at a stop light). After a while, I noticed that every
> time this occurred, someone near me was listening to KSON (FM 97.3). And
> when they would get about 20 to 30 feet away from me, my station came back.
> In fact, one time, there were several red lights in a row. At one, I stayed
> put after it turned green. True to form, it happened again. I raced to the
> next light. As I passed the car tuned to KSON, my station cut out. I
> passed them and it came back. At the next red, it cut out again when they
> got within range. No other radio stations being listened to nearby ever had
> this effect. Even when I was listening at home, on the stereo in my house,
> when a car would roll by, listening to KSON, my signal would cut out.
Do the arithmetic. 107.9 - 97.3 = 10.6. This is approximately the IF
(intermediate frequency) used in FM receivers. So your receiver was
being captured by the local oscillator radiation of the other guy's
receiver. Sloppy design of a superheterodyne receiver.
carl
--
carl lowenstein marine physical lab u.c. san diego
[EMAIL PROTECTED]
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