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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: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 1 May 2014 20:38:14 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
While roofing filters are indeed nice and serve a really nice function, I truly believe the lack of understanding as to what they do and how the perform and when they are needed is in short supply. I found that the "authority" Rob Sherwood has a very nice presentation on his website where he discusses the advantage and importance of roofing filters.

My general take is: If one intends to operate with 5 to 10 active stations in an area the size of a football field on an event such as Field Day, then they are absolutely necessary. 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.

Just remember, the selectivity is developed by the DSP system.

73
Bob, K4TAX




----- Original Message ----- From: "Kim Elmore" <cw_de_n5op@sbcglobal.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Thursday, May 01, 2014 8:16 PM
Subject: Re: [TenTec] Wide roofing filter for the RX-366?


While filters are expensive, they can be swapped out without a lot of trouble. That said, I chose a wide filter of 6 kHz, then the 2.4 kHz standard filter and finally a 500 Hz filter for the narrowest. In my environment, I won't have to deal with any strong (next door) signals in a 500 Hz passband. Whenever I take the rig to, say, FD, only the main rx is much used and it has the 300 Hz roofing filter, 600 Hz, 1.0 kHz, 1.8 kHz, 2.4 kHz, 6 kHz and 20 kHz filters.

I can't see the point in having a 2.7 kHz, 2.4 kHz, and 500/600 Hz filters because there's not enough difference in the 2.7 kHz and 2.4. Perhaps a the standard 2.4 kHz, 1 kHz and 500/600 Hz filter would be best if you have no interest in AM.

Kim N5OP


On 4/30/2014 9:15 PM, Carl Gansen wrote:
I am curious about what members of the list are using for their wide
roofing filter
in the RX-366. At this time, with CW as my main interest, I have a 600Hz
and a
300Hz in place in mine.

I have little to no interest in AM but I do listen in on digital modes with
FlDigi.

Can anybody offer some thoughts on the filter (brand & bandwidth) that they
chose
and the reasoning behind that choice?


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