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21. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Joe <nss@mwt.net>; Date: Wed, 04 Jul 2012 07:49:56 -0500; Wow, This has me curious. How did you measure the power coming back down the other feedline? Sounds like a simple question, Is it as simple as a wattmeter in line and dummy load? Joe WB9SBD Sig The O; /archives//html/CQ-Contest/2012-07/msg00027.html (13,923 bytes)
22. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Jul 2012 09:39:38 -0400; Undesired power levels are **generally** worse from a higher frequency element to a lower frequency element, rather than the other way around. The wider the spread the greater the difference. My 15M; /archives//html/CQ-Contest/2012-07/msg00028.html (10,139 bytes)
23. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Jul 2012 11:30:03 -0400; Sometimes things get useful when the information is wider. <<snip>> I disagree with that, Jukka. Traditional filters neither route things to a ground nor dissipate a significant portion of unwanted; /archives//html/CQ-Contest/2012-07/msg00029.html (13,968 bytes)
24. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Jul 2012 11:31:02 -0400; No, not if you want to know the true amount of available power. :-) See my long post. _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http://lists.c; /archives//html/CQ-Contest/2012-07/msg00030.html (9,208 bytes)
25. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Wed, 4 Jul 2012 08:31:27 -0700; Let the flames begin, LOL. Sorry Keith, the measured isolation between 15m TX and 20m RX on the C31XR with physical separation of only 18" is legitimate. Now do consider that I am only an average ham; /archives//html/CQ-Contest/2012-07/msg00031.html (18,380 bytes)
26. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Dave Hachadorian" <k6ll@arrl.net>; Date: Wed, 4 Jul 2012 08:41:18 -0700; This has been an interesting thread, helping to focus one's thinking about stubs. So each stub placed after an amplifier serves two purposes: 1. In transmit mode, it reduces harmonics and crud to the; /archives//html/CQ-Contest/2012-07/msg00032.html (15,168 bytes)
27. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Wed, 4 Jul 2012 08:38:06 -0700; Hi Joe, I placed my watt meter to read power backwards in between my antenna and dummy load. When placing the filters inline I placed them between the watt meter and antenna. This is my understanding; /archives//html/CQ-Contest/2012-07/msg00033.html (15,603 bytes)
28. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Joe <nss@mwt.net>; Date: Wed, 04 Jul 2012 10:43:06 -0500; Kinda like a transformer,, Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 7/4/2012 8:39 AM, Tom W8JI wrote: _______________________________________; /archives//html/CQ-Contest/2012-07/msg00034.html (10,374 bytes)
29. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Gary Sutcliffe <w9xt@unifiedmicro.com>; Date: Wed, 04 Jul 2012 10:52:25 -0500; Has anyone built a switching stub box for multi-band operation that switches in the proper stubs for the current band? Any issues or things to watch out for? Thanks! Gary, W9XT www.w9xt.com _________; /archives//html/CQ-Contest/2012-07/msg00035.html (9,974 bytes)
30. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Jul 2012 14:21:12 -0400; It could be much more than that, actually. Maximum power transfer would occur when the optimum impedance on 15 meters for the 20 meter element is presented. The simple cheap test would be installing; /archives//html/CQ-Contest/2012-07/msg00036.html (12,762 bytes)
31. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Wed, 4 Jul 2012 19:36:04 -0700; There is a good article that was published in NCJ... K6LA paid Top Ten Devices to make such a thing for his QTH. The article is available for reading on Top Ten's website. 73, _______________________; /archives//html/CQ-Contest/2012-07/msg00037.html (10,553 bytes)
32. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Barry <w2up@comcast.net>; Date: Thu, 05 Jul 2012 05:26:14 -0600; I used off-the-shelf Top Ten Devices boxes. It didn't require any custom design from them. To get the band decoders to switch multiple devices (stubs, bandpass filters and antennas) in a neat way, I; /archives//html/CQ-Contest/2012-07/msg00038.html (11,468 bytes)
33. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 5 Jul 2012 07:49:48 -0400; It's pretty simple to do. I have a 8 position switch box in my radio room that has stubs on ports. This is the same box that selects antenna trunks to different areas. I use steering diodes to activ; /archives//html/CQ-Contest/2012-07/msg00039.html (11,814 bytes)
34. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Thu, 5 Jul 2012 08:21:17 -0500; Did not realize you were using a C31XR. I would not have guessed a situation like this where two rigs were connected to the same antenna. Personally, I find that an unreasonable risk. 73, Keith NM5G; /archives//html/CQ-Contest/2012-07/msg00040.html (18,167 bytes)
35. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Thu, 5 Jul 2012 07:28:23 -0700; I'd personally love to have two or more towers for my QTH and not have so much the coupled energy. There are others using the C31XR with individual feed lines like myself. Then there are a number of; /archives//html/CQ-Contest/2012-07/msg00041.html (22,532 bytes)
36. [CQ-Contest] Bandpass filter (score: 1): Author: "James Cain" <jamesdavidcain@gmail.com>; Date: Thu, 05 Jul 2012 14:56:58 -0800; Maybe you should think about reallocating your resources. More land, less radio equipment. K1TN _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http; /archives//html/CQ-Contest/2012-07/msg00044.html (7,946 bytes)
37. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Martin Durham" <w1md@cfl.rr.com>; Date: Thu, 5 Jul 2012 19:53:40 -0400; We ran 3 K3's into a C31XR with approx.. 800W from each 'band'...only 800w because we were AC limited at the QTH. A custom highpower TRI-plexer was built and used on the C31XR. It worked amazingly we; /archives//html/CQ-Contest/2012-07/msg00045.html (19,087 bytes)
38. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Jukka Klemola <jpklemola@gmail.com>; Date: Fri, 6 Jul 2012 12:00:05 +0300; Cool if you used one coax for all three 800W radios .. did you ? Even such triplexers can be done with careful design and then pruning the Farads, Henrys and walls in the box. I think there was a 100; /archives//html/CQ-Contest/2012-07/msg00046.html (22,204 bytes)
39. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Martin Durham <w1md@cfl.rr.com>; Date: Fri, 6 Jul 2012 06:14:15 -0400; One coax to the antenna... It is designed for (and tested at) 1500w per band. MD Martin Durham System Engineer, Harris corp. Mdurham@harris.com Sent from my iPad _____________________________________; /archives//html/CQ-Contest/2012-07/msg00047.html (11,391 bytes)
40. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 6 Jul 2012 14:31:28 -0400; I was considering band splitters to allow single feeders to be used on multiple bands to save cable, not necessarily for feeding one antenna. I would split bands at both ends. The only worry I had,; /archives//html/CQ-Contest/2012-07/msg00050.html (10,278 bytes)

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