Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[CQ\-Contest\]\s+Bandpass\s+filter\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[CQ\-Contest\]\s+Bandpass\s+filter\s*$/: 57 ]

Total 57 documents matching your query.

41. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Sat, 7 Jul 2012 01:53:58 -0400; ...snip... Yes, indeed. Could be and IS. I've had a C31 for years. The separate feedline "option" for the C31 is QUITE the stretch. The numbers some previous posters have quoted are conservative to m; /archives//html/CQ-Contest/2012-07/msg00051.html (9,741 bytes)
42. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 7 Jul 2012 10:06:44 -0400; Here is the problem, although appearently it is difficult to get across. :-) Filters do not dissipate out-of-band power, they reflect it. Stress on the filter will vary with filter placement on the; /archives//html/CQ-Contest/2012-07/msg00053.html (11,540 bytes)
43. [CQ-Contest] Bandpass filter (score: 1): Author: "Hal Kennedy" <halken@comcast.net>; Date: Sat, 7 Jul 2012 15:20:41 -0400; I've run C31XRs at two different QTHs, with triple feedlines on any two bands at the same time, at 1.5 KW, with zero problems for 48 straight hours. In both cases the feedlines came to stubs, then Du; /archives//html/CQ-Contest/2012-07/msg00055.html (8,534 bytes)
44. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Sat, 7 Jul 2012 17:17:11 -0400; Yup, definitely. The W3NJN QRO filters certainly do not have any dippy-dink caps, all appropriately sized. Cost more money, but in line after the amps they simply killed the problem. Worth every bit; /archives//html/CQ-Contest/2012-07/msg00057.html (12,171 bytes)
45. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 7 Jul 2012 19:19:22 -0400; Hi Guy, The reason why I find this interesting really centers around two things: 1.) making things work as well as possible for the investment appeals to me 2.) it's interesting to learn how stubs a; /archives//html/CQ-Contest/2012-07/msg00058.html (9,588 bytes)
46. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Barry <w2up@comcast.net>; Date: Sat, 07 Jul 2012 16:52:05 -0600; Used the ICE boxes and blew caps more than once. Replaced them with NQN filters from Array Solutions (the old style, all in one box version). Blew one cap, once. Had stubs in line, too. Barry W2UP __; /archives//html/CQ-Contest/2012-07/msg00059.html (13,325 bytes)
47. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Jukka Klemola <jpklemola@gmail.com>; Date: Sun, 8 Jul 2012 13:02:24 +0300; Hi, Tom has many things correct. As a summary: there is current flowing through filter components when there is stopband energy trying to enter the filter. It creates heat and thus components failure; /archives//html/CQ-Contest/2012-07/msg00061.html (15,312 bytes)
48. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Sun, 8 Jul 2012 09:04:22 -0500; This is a valuable resource to plan antenna location for a multi-transmitter station. Thank you for providing it. I can relate to the problem of capacitors with lower than sufficient voltage rating.; /archives//html/CQ-Contest/2012-07/msg00064.html (12,873 bytes)
49. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Dave Hachadorian" <k6ll@arrl.net>; Date: Sun, 8 Jul 2012 13:07:56 -0700; It's the current, not the voltage that causes capacitors in the ICE filters to heat up and change value. The ones that fail are the caps that go to ground on the radio side (not the antenna side) of; /archives//html/CQ-Contest/2012-07/msg00067.html (10,199 bytes)
50. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Sun, 8 Jul 2012 16:01:22 -0500; Hot dog! Never thought of that. Thanks for the tip. I will be ordering a batch of these for both bands. 73, Keith NM5G It's the current, not the voltage that causes capacitors in the ICE filters to h; /archives//html/CQ-Contest/2012-07/msg00070.html (10,273 bytes)
51. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Jeff Blaine" <jeff@ac0c.com>; Date: Sun, 8 Jul 2012 19:58:24 -0500; Actually both are right - the current and the heat are the problem - but they are tied together through the ESR (if specified). The cap has a finite electrical resistance at any given frequency. And; /archives//html/CQ-Contest/2012-07/msg00071.html (11,385 bytes)
52. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 9 Jul 2012 08:09:30 -0400; Keith, I added a SPICE model of two low pass 3.6 MHz filters to my webpage. You'll see the stress on parts there for a 100 volt peak source through a 50 ohm resistor, which is about like a 50 watt t; /archives//html/CQ-Contest/2012-07/msg00076.html (11,833 bytes)
53. Re: [CQ-Contest] Bandpass Filter (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Mon, 9 Jul 2012 12:52:17 +0000; An interesting thread. A single tri-fed C31XR has been used with significant success in both SO2R and M/2 scenarios at P3F for 8 years now. The single tower installation supports a C31XR, an XM240 an; /archives//html/CQ-Contest/2012-07/msg00077.html (14,158 bytes)
54. Re: [CQ-Contest] Bandpass Filter (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Mon, 9 Jul 2012 13:54:17 +0000; Tim I'm not sure there would be any significant advantage. I have no plans to do this myself as it would require I build another high power tri-plexer. That's a lot of work just to stand still. I dou; /archives//html/CQ-Contest/2012-07/msg00080.html (18,447 bytes)
55. Re: [CQ-Contest] Bandpass Filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Mon, 9 Jul 2012 06:22:20 -0700; Bob, what are your thoughts on the benefit of switching an individual feed line interlaced monobander, like the C31XR, over to a single feed line tribander with an antenna combiner attached? Assuming; /archives//html/CQ-Contest/2012-07/msg00082.html (16,757 bytes)
56. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Joe <nss@mwt.net>; Date: Tue, 10 Jul 2012 09:35:58 -0500; That is super complex. but, can these stubs like seen here, http://www.k1ttt.net/technote/k2trstub.html http://www.k1ttt.net/technote/K2TR_Multi_Transmitter_Stubs.jpg Be made switchable using say rad; /archives//html/CQ-Contest/2012-07/msg00094.html (13,451 bytes)
57. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Wed, 11 Jul 2012 10:42:49 -0500; Tom, Thanks for the SPICE model. 73, Keith NM5G Keith, I added a SPICE model of two low pass 3.6 MHz filters to my webpage. You'll see the stress on parts there for a 100 volt peak source through a 5; /archives//html/CQ-Contest/2012-07/msg00108.html (10,038 bytes)

Current List: 41 - 57
Page: [1] [2] [3]