[TowerTalk] Bandpass Filters

[WA3GIN]

OK,  So, has anyone measured how much attentuation is provided by the use of 
a radios internal tuner or even an outboard "ultimate transmatch" designed 
tuner?

I used to live about a mile from a 20m DXer.  We could both operate on 20m 
but I could get closer to his freq. when using the tuner as a narrow inband 
narrow pass filter.

thoughts,
dave
wa3gin
----- Original Message ----- 
From: "Ethan Miller K8GU" <ethan at k8gu.com>
To: <towertalk at contesting.com>
Sent: Wednesday, January 09, 2008 10:58 PM
Subject: Re: [TowerTalk] Bandpass Filters


> 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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