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1. [Yaesu] FW: roofing filters (score: 1): Author: Adam Farson <farson@shaw.ca>; Date: Thu, 20 Jul 2006 23:14:11 -0700; Hi Cecil, Er...the IC-756Pro series does have 15 kHz roofing filters at the first (64.455 MHz) and second (455 kHz) IF's. Cheers for now, 73, Adam VA7OJ/AB4OJ Scanned for viruses by Blue Coat http://; /archives//html/Yaesu/2006-07/msg00041.html (6,483 bytes)
2. Re: [Yaesu] FW: roofing filters (score: 1): Author: "Cecil Acuff" <chacuff@cableone.net>; Date: Fri, 21 Jul 2006 08:15:32 -0500; It is my understanding that the Pro III implemented a fixed 15Khz roofing filter like that used in the 7800 but the earlier Pro II (which I had) did not. All the reading I have done on the subject in; /archives//html/Yaesu/2006-07/msg00042.html (7,961 bytes)
3. Re: [Yaesu] FW: roofing filters (score: 1): Author: Jerry Flanders <jeflanders@comcast.net>; Date: Fri, 21 Jul 2006 14:15:59 +0000; The original PRO, as well as II and III ? Jerry W4UK _______________________________________________ Yaesu mailing list Yaesu@contesting.com http://lists.contesting.com/mailman/listinfo/yaesu; /archives//html/Yaesu/2006-07/msg00043.html (7,195 bytes)
4. Re: [Yaesu] FW: roofing filters (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Fri, 21 Jul 2006 09:41:42 -0500; AFAIK, the original Icom 7800 had 15KHz and 6KHz selectable roofing filters. The 9000 has 15, 6 and 3. According to the 2000 manual I saw, it also has 15, 6 and 3. I understand there is now a free up; /archives//html/Yaesu/2006-07/msg00044.html (10,820 bytes)
5. Re: [Yaesu] FW: roofing filters (score: 1): Author: Paul Manuel <k4pdm@yahoo.com>; Date: Fri, 21 Jul 2006 07:54:29 -0700 (PDT); I am a bit confused about the term "roofing filters" as it seems to be a new term for an old idea. Is "roofing filter" today's term for a hardware, high-IF filter, to be used in conjunction with the; /archives//html/Yaesu/2006-07/msg00045.html (8,141 bytes)
6. Re: [Yaesu] FW: roofing filters (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Fri, 21 Jul 2006 10:43:30 -0500; I believe the new term was first used when the filter in front of the IF string became selectable. The filters you are speaking of are IN the IF string. To my knowledge, in the past most good receive; /archives//html/Yaesu/2006-07/msg00046.html (8,965 bytes)
7. Re: [Yaesu] FW: roofing filters (score: 1): Author: Paul Manuel <k4pdm@yahoo.com>; Date: Fri, 21 Jul 2006 09:51:24 -0700 (PDT); So the filter operates AT the receive frequency, before conversion to an IF? Hmm... 73, Paul K4PDM __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the; /archives//html/Yaesu/2006-07/msg00047.html (7,783 bytes)
8. Re: [Yaesu] FW: roofing filters (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Fri, 21 Jul 2006 11:58:03 -0500; It is actually a part of the first mixer. Keith So there is a switchable filter that works at the actual received frequency, before frequency conversion to an IF? Now I am really confused! 73, Paul K; /archives//html/Yaesu/2006-07/msg00048.html (8,802 bytes)
9. Re: [Yaesu] FW: roofing filters (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Fri, 21 Jul 2006 13:04:49 -0400; The roofing filter is the 1st IF filter, and determines the absolute widest bandwidth which can be received. There are 4 IFs in the Mark V. The stock roofing filter in the radio is 15 Khz, a 70 Mhz f; /archives//html/Yaesu/2006-07/msg00049.html (10,051 bytes)
10. Re: [Yaesu] FW: roofing filters (score: 1): Author: Adam Farson <farson@shaw.ca>; Date: Fri, 21 Jul 2006 10:30:33 -0700; Hi Cecil, All the IC-756Pro-series radios have 2 roofing filters - the first at 64.455 MHz, and the second at 455 kHz (actually a two-section filter with the NB noise gate between the sections.) In t; /archives//html/Yaesu/2006-07/msg00050.html (8,829 bytes)
11. Re: [Yaesu] FW: roofing filters (score: 1): Author: Adam Farson <farson@shaw.ca>; Date: Fri, 21 Jul 2006 10:35:34 -0700; Hi Jerry, Yes. In fact, a roofing filter is required by definition in any superhet, for image suppression and to reduce the statistical likelihood that strong out-of-band signals will ride down the I; /archives//html/Yaesu/2006-07/msg00051.html (8,513 bytes)
12. Re: [Yaesu] FW: roofing filters (score: 1): Author: Adam Farson <farson@shaw.ca>; Date: Fri, 21 Jul 2006 10:50:41 -0700; Hi Keith, I first ran across the term "roofing filter" in the 1960's, whilst working for Racal. Roofing filters have always been used in analogue up-converting superhet receivers. Here is an example; /archives//html/Yaesu/2006-07/msg00052.html (8,425 bytes)

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