Thread
:
High IP-3 (TOIP) in FM amplifiers?
View Single Post
#
2
August 20th 03, 07:40 PM
Tom Bruhns
Posts: n/a
(ForNewsPost) wrote in message ...
Hi All,
I have been very curious if IP3 matters for class A receiver amplifiers used
for FM or FSK applications. Since linearity doesn't matter with frequency
modulated RF signals, does a high IP3 matter at all?
Sure it does! Imagine that you want to listen to 146.52MHz and
there's a weak signal there. Imagine that you have a couple local
repeaters on 146.62 and 146.72MHz. Where are the third-order products
from the repeaters? One lands right on your weak signal. This sort
of thing is specifically a problem at repeater sites where there may
be many transmitters sharing the same mountain top or tower.
Cheers,
Tom
Reply With Quote
