Al,
> of transmitting through the filter when nearby ax's have their filter in
> place?
The FCC harmonic limits are usually not enough by themselves to ensure
that you don't get interference (or blocking). So, it helps to have
something to knock down the harmonics. Transmitting through a filter
also reduces broadband synthesizer products.
There are a lot of filter designs out there that work in the
RX-ant/pre-amp loop provided by many rigs. K1NQ and K1KP have such
designs, the former on the YCCC web site, the latter in the May 1995
NCJ.
It behooves anyone who's interested in doing this right (instead of
just throwing money at it) to carefully read the W3NQN articles (two
QST articles from 1998 and a QEX article from 1999) and W2VJN's
booklet "Managing Interstation Interference."
Sorry that since I'm not a subscriber, these posts are LDE...
73,
--Ethan, K8GU/9.
http://www.k8gu.com/
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