In message , Phil Allison
writes

"Jeff Liebermann Radio Ham ****wit "

One guess(tm) is that the Radio Shock amplifier is rather noisy. The
additional noise generated by the amplifier is stronger than the
previously weak signals. If really awful, weak signals will be
totally lost in the noise.

** ********.


The Radio Shock amplifier might be oscillating, thus creating the
in-band strong signal necessary to create the blocking effect.

** More ********.

Results would be very bad all over the band.


The FM tuner might have an AGC section. This is required for direct
digital receivers that have an A/D converter in the front end of at
the IF frequency. The AGC is necessary to use the entire range of the
A/D. These usually have a limited dynamic (amplitude) range and are
easily overloaded. When amplified, this would cause a strong signal
to disappear as it runs out of head room.

** Massive pile of ******** !!!

FM signals are not affected by amplitude limiting - cos limiting is just
what the IF stage is designed to do.

****WIT !!!

You forget that the limiter stage has to handle only one FM signal. The
discussion is about possible overload in an antenna amplifier, passing
lots of individual FM signals. Despite being FM, nasty things are likely
to happen.
--
Ian