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Re: [TenTec] Wide roofing filter for the RX-366?

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Wide roofing filter for the RX-366?
From: Barry N1EU <barry.n1eu@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 2 May 2014 04:31:42 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Thu, May 1, 2014 at 9:38 PM, Bob McGraw - K4TAX <RMcGraw@blomand.net>wrote:

> Otherwise, if you live in an area 5 to 10 miles from town and the nearest
> ham does not operate on the same band the same time as you, then they
> aren't necessary but, certainly nice to have available.
>
>
As far as their minimal necessity - you need at least one roofing filter
installed to hear anything.  And any signal wider than your widest roofing
filter will be attenuated outside the passband.  So at minimum, install a
single roofing filter as wide as the widest signal(s) you want to listen to.

Hardware AGC kicks in by any signal on the band that is over ~ s9 +25dB, to
protect the DAC dynamic range.  Roofing filters prevent AGC riding by such
a strong signal outside the passband.  Signals of that strength are not
uncommon here on the east coast on the low bands, especially during
contests - also on 20M from European powerhouse contest stations.  So
serious contesters and low band dx'ers DO need roofing filters.

73, Barry N1EU
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