Consider the most probable cause. An FM receiver at 104.1 has a local
oscillator at 114.8 MHz to produce an IF of 10.7 MHz. Not only will
that
beat with 104.1 on the low side of the LO, it will beat with 125.5 on
the
high side. Most FM receivers have at least a +/- 50 kHz. wide IF strip
to
allow the stereo subcarrier at 38 kHz. to come through, so 125.45,
125.5,
and 125.55 will come through as well.
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Jim, you are preaching in Sanscrit... Unless they are ham radio ops, or
have a degree in EE, they won't even begin to comprehend..

0: this is what cheap radio equipment gets you
1: his receiver receives many, many radio frequencies, not just the one
it is tuned for
2: his 'transmitter' is radiating RF on more frequencies than 104.1
3: his receiver is actually radiating RF into the receiver antenna and
broadcasting
4. the combination of RF from the transmitter mixing with the many RF
signals present on the receiver's antenna terminals cause "phantom"
signals to be heard

To cure this he needs to put a filter on the transmitter output and one
on the receiver input... Or simply turn the FM transmitter off...

denny