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Total 17 documents matching your query.

1. [RFI] Is a low pass filter necessary? (score: 1): Author: John <af5cc@fidmail.com>; Date: Thu, 10 May 2012 22:41:16 -0500; I was on an antennas reflector recently asking about the proper placement of a low pass filter and several members asked why am I using one at all. They said with the modern radios (I have an Icom 70; /archives//html/RFI/2012-05/msg00011.html (7,399 bytes)
2. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 10 May 2012 22:52:38 -0500; Even though I know that modern rigs don't need one and that modern amplifiers don't need one and that VHF TV is dead as a door nail (or is that coffin nail?), I anachronistically use one. The inserti; /archives//html/RFI/2012-05/msg00012.html (7,936 bytes)
3. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Dale Svetanoff" <svetanoff@earthlink.net>; Date: Thu, 10 May 2012 23:35:46 -0500; John, Today's rigs are, in fact, designed with internal filters (low pass and/or band pass) so that the rigs can meet the spurious and harmonic requirements set forth by FCC and other regulatory bodi; /archives//html/RFI/2012-05/msg00013.html (10,997 bytes)
4. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "John G." <af5cc@fidmail.com>; Date: Thu, 10 May 2012 21:37:33 -0800; That is kind of my thinking as well. I have a Drake LP filter in line right now, and not sure what would be gained by removing it. John AF5CC _______________________________________________ RFI maili; /archives//html/RFI/2012-05/msg00014.html (9,667 bytes)
5. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Hardy Landskov" <n7rt@cox.net>; Date: Thu, 10 May 2012 21:48:43 -0700; I have a 22KW BC station about 5.5 miles away from me and it turns the K3 into Hamburger until Sundown. I talked to N6KR at Visalia and he said I was in a minority of people having this problem and p; /archives//html/RFI/2012-05/msg00015.html (9,844 bytes)
6. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: W0MU Mike Fatchett <w0mu@w0mu.com>; Date: Thu, 10 May 2012 23:09:54 -0600; So why is that the K3's problem? I have 50kw KOA 850 5 miles away and I don't have any problems. What would this have to do with low pass filters anyway? Mike W0MU W0MU-1 CC Cluster w0mu.net ________; /archives//html/RFI/2012-05/msg00016.html (10,705 bytes)
7. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 11 May 2012 03:19:18 -0400; Most modern rigs contain many. The finals will amplify 28 MHz as well as 1.8. 2nd harmonic of 1.8, is 3.6 Solid state high power amps are the same way. Basically their band switching is changing the; /archives//html/RFI/2012-05/msg00019.html (10,014 bytes)
8. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 11 May 2012 03:24:07 -0400; Ah, standardization! DRM to most of the world = Digital Rights Management. 73 Roger (K8RI) _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.; /archives//html/RFI/2012-05/msg00020.html (10,131 bytes)
9. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>; Date: Fri, 11 May 2012 06:39:23 -0400; Despite the fact that most of the TVI cases I've personally investigated over the years were the result of either front-end overload or direct ingress to the TV set's IF circuitry (which used to be a; /archives//html/RFI/2012-05/msg00021.html (8,692 bytes)
10. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Fri, 11 May 2012 08:45:46 -0400; I thought the ordinary HF low-pass filters were and still are designed for up to HF only, so they don't pass 6 meters which is VHF. I wouldn't expect that to change unless the filter specifically st; /archives//html/RFI/2012-05/msg00022.html (8,399 bytes)
11. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Fri, 11 May 2012 08:57:44 -0400; Back in the day, I believe Drake made two - a cheaper one that rolled off between 40 and 50 MHz, and one intended specifically for 6 meters, with a sharp roll-off above the band and below Channel 2.; /archives//html/RFI/2012-05/msg00023.html (10,001 bytes)
12. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Jim, KS7S" <ks7s@cox.net>; Date: Fri, 11 May 2012 06:17:57 -0700; B&W made the FL-6/1500, which cut off above 54 MHz - that's what I use here. I'm sure they had an HF model too. 73 Jim KS7S Back in the day, I believe Drake made two - a cheaper one that rolled off b; /archives//html/RFI/2012-05/msg00024.html (10,414 bytes)
13. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Mark n2qt" <n2qt@verizon.net>; Date: Fri, 11 May 2012 09:39:00 -0400; drake had a tv-3300-lp with a 33Mhz cutoff and a tv-1000lp which moved the cutoff up so that they rated it for 1KW up to 30Mhz and 200 watts up to 52 Mhz. I have two of the tv-1000lp and one of them; /archives//html/RFI/2012-05/msg00025.html (10,201 bytes)
14. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "John G." <af5cc@fidmail.com>; Date: Fri, 11 May 2012 07:02:14 -0800; I am using one of the Drake TV-1000LP right now. Seems to still do ok on 6m. John AF5CC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com; /archives//html/RFI/2012-05/msg00026.html (11,212 bytes)
15. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 11 May 2012 09:20:26 -0700; Remember that the original Drake filters were designed and built when FCC Rules restricted us to 1,000 watts PLATE INPUT power, which, for all practical purposes, limited us to 600-700W output power,; /archives//html/RFI/2012-05/msg00027.html (9,951 bytes)
16. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 11 May 2012 14:18:24 -0400; Low cost? The real culprits I've seen, seem to be some very expensive, top end rigs when run at partial power. 73 Roger (K8RI) _______________________________________________ RFI mailing list RFI@con; /archives//html/RFI/2012-05/msg00028.html (10,631 bytes)
17. Re: [RFI] Is a low pass filter necessary? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 11 May 2012 16:21:51 -0400; Another thing I've noticed with the newer rigs is they give the user far more, if not total control over the audio, both coming and going. Because of this, the set up is far less tolerant of mistakes; /archives//html/RFI/2012-05/msg00029.html (13,791 bytes)

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