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1. Topband: MFJ 259B on 160M (score: 1): Author: "Glen" <k4kv@mds-ham.com>; Date: Wed, 23 Sep 2009 09:32:59 -0400; Hello, Has anyone made an effective AM broadcast filter (HB) for their analyzer? I have to feel that my lack of readings on the unipole may stem from AM interference. I have a station here in town, o; /archives//html/Topband/2009-09/msg00099.html (6,388 bytes)
2. Re: Topband: MFJ 259B on 160M (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 23 Sep 2009 13:48:37 -0700 (PDT); If you have just 1 station, MFJ sells a notch filter. If you have multiple stations, you need a filter. There is a wide range of filters where basically you pay more money for more selectivity. Price; /archives//html/Topband/2009-09/msg00100.html (8,543 bytes)
3. Re: Topband: MFJ 259B on 160M (score: 1): Author: w2pm@aol.com; Date: Wed, 23 Sep 2009 19:42:08 -0400; MFJ makes the MFJ-731 SWR Analyzer Filter for the 259 which allows you to notch out BC band signals while not distorting the actual impedance readings of the antenna. I use it here and it works very; /archives//html/Topband/2009-09/msg00102.html (7,683 bytes)
4. Re: Topband: MFJ 259B on 160M (score: 1): Author: Art <k6xt@arrl.net>; Date: Thu, 24 Sep 2009 19:25:35 -0600; Par Electronics makes a very good BC filter. Easily meets specs in 50 ohms according to my swept analyzer. http://www.parelectronics.com/bcst-hpf.htm 73 Art __________________________________________; /archives//html/Topband/2009-09/msg00107.html (7,926 bytes)
5. Re: Topband: MFJ 259B on 160M (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Fri, 25 Sep 2009 07:20:40 -0400; Another approach to interference off band uses a different analyzer, with a BC rejection band pass filter in line. The AIM4170 will allow you to run a "calibration" through the BC filter to a 50 ohm; /archives//html/Topband/2009-09/msg00110.html (9,354 bytes)
6. Re: Topband: MFJ 259B on 160M (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Sun, 27 Sep 2009 09:16:00 -0600; Glen, Try using the MFJ after 6 PM. The AM BC station will have reduced power. Dave WX7G _______________________________________________ Topband mailing list Topband@contesting.com http://lists.conte; /archives//html/Topband/2009-09/msg00144.html (8,193 bytes)
7. Re: Topband: MFJ 259B on 160M (score: 1): Author: mstangelo@comcast.net; Date: Mon, 28 Sep 2009 13:39:58 +0000 (UTC); Glen, The problem with using a filter ahead of your "wideband" MFJ-259 analyzer is that the filter will transform the impedance of the load you're trying to measure. You have a better chance of measu; /archives//html/Topband/2009-09/msg00150.html (9,101 bytes)

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