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21. Re: [TenTec] Low Pass Filter (score: 1): Author: "Bob Close" <rclose@nhwisp.com>; Date: Mon, 19 May 2008 15:29:26 -0400; Jim, it has been a long time since I got to ask a question of a PhD engineer type! IF the transceiver had harmonics and those were transferred to the linear, would they not be amplified by a factor o; /archives//html/TenTec/2008-05/msg00398.html (14,519 bytes)
22. Re: [TenTec] Low Pass Filter (score: 1): Author: Rick Denney <rick@rickdenney.com>; Date: Mon, 19 May 2008 15:50:52 -0400; Bob Close writes... Seems to me a low-pass filter is not a band-pass filter, and isn't there for normal attenuation of close-in spurs. It seems to me there for attenuating VHF spurs above 30 MHz so t; /archives//html/TenTec/2008-05/msg00399.html (8,967 bytes)
23. Re: [TenTec] Low Pass Filter (score: 1): Author: "Bob Close" <rclose@nhwisp.com>; Date: Mon, 19 May 2008 17:40:39 -0400; a band pass filter is nothing but a low-pass combined with a high-pass filter. The net result is there is a band of frequencies passed in all three designs. In the case of a low-pass filter, it is de; /archives//html/TenTec/2008-05/msg00401.html (12,018 bytes)
24. Re: [TenTec] Low Pass Filter (score: 1): Author: Rick Denney <rick@rickdenney.com>; Date: Mon, 19 May 2008 18:46:24 -0400; Bob Close writes... Sure. But a low-pass filter is designed to attenuate broadband noise well outside the range of desired frequencies a station might want to use. It's designed to attenuate spurious; /archives//html/TenTec/2008-05/msg00403.html (11,364 bytes)
25. Re: [TenTec] Low Pass Filter (score: 1): Author: "DAVID HELLER" <dtx@verizon.net>; Date: Mon, 19 May 2008 19:54:15 -0400; Re-read my comments on the RFI business. Especially the general rule: If one and only one TV in close proximity to the ham station is not bothered the rig is clean and nothing short of QRT will make; /archives//html/TenTec/2008-05/msg00404.html (10,888 bytes)
26. Re: [TenTec] Low Pass Filter (score: 1): Author: "DAVID HELLER" <dtx@verizon.net>; Date: Mon, 19 May 2008 20:00:10 -0400; If the LP filter is actually needed Jerry's one-foot spacing should be an absolute maximum.....As short as possible. And to expand, the high-pass filter on a TV should be very close to the tuner itse; /archives//html/TenTec/2008-05/msg00405.html (10,724 bytes)
27. Re: [TenTec] Low Pass Filter (score: 1): Author: "DAVID HELLER" <dtx@verizon.net>; Date: Mon, 19 May 2008 20:04:27 -0400; I doubt the value of an after-tuner filter - the filter needs to see a good match fore-and-aft. Ron is so right about the chances of filter damage - that would mean a good part of your output is goin; /archives//html/TenTec/2008-05/msg00406.html (10,749 bytes)
28. Re: [TenTec] Low Pass Filter (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Mon, 19 May 2008 22:00:17 -0400; Unfortunately for us all, many linear amplifiers have some gain at VHF frequencies. In fact, much has been written about the idea that gain at VHF frequencies can cause runaway "glitches" in linears,; /archives//html/TenTec/2008-05/msg00407.html (10,867 bytes)
29. Re: [TenTec] Low Pass Filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 20 May 2008 09:50:09 -0600; Except that the class B operation of the PA device (for much greater efficiency than class A which is most linear) involves half cycle device conduction and that creates harmonics only a couple dB do; /archives//html/TenTec/2008-05/msg00410.html (16,111 bytes)
30. Re: [TenTec] Low Pass Filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 20 May 2008 09:57:29 -0600; That is not necessarily true. Many a band pass filter is made of parallel and series resonant circuits (at the center frequency of the band pass) coupled together. Yes, but you have to watch for reso; /archives//html/TenTec/2008-05/msg00411.html (12,596 bytes)
31. Re: [TenTec] Low Pass Filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 20 May 2008 10:11:09 -0600; The active devices do have gain at VHF. The input and output tuned circuits should keep that gain to the devices alone. That's why there are parasitic suppressors always in the plate, often other pla; /archives//html/TenTec/2008-05/msg00412.html (12,140 bytes)
32. Re: [TenTec] Low Pass Filter (score: 1): Author: Rick Denney <rick@rickdenney.com>; Date: Tue, 20 May 2008 13:01:35 -0400; Dr. Gerald N. Johnson writes... Actually, folks who delve into musical acoustics use the term "overtone" and "partial" more often than "harmonic". The second harmonic, which is at the octave of the f; /archives//html/TenTec/2008-05/msg00415.html (10,652 bytes)
33. Re: [TenTec] Low Pass Filter (score: 1): Author: "JAMES HANLON" <knjhanlon@msn.com>; Date: Tue, 20 May 2008 11:06:12 -0600; Bob, Let me first apologize for not replying sooner. I get the digest from the reflector, so I have some delay before I get to see your messages. You asked, "IF the transceiver had harmonics and thos; /archives//html/TenTec/2008-05/msg00416.html (13,547 bytes)
34. Re: [TenTec] Low Pass Filter (score: 1): Author: ron <roncasa@verizon.net>; Date: Tue, 20 May 2008 13:29:45 -0400; Nicely in perspective, Rick. any comments from Trombone players?? (smile) Ron "the 516 is a keeper" _______________________________________________ TenTec mailing list TenTec@contesting.com http://l; /archives//html/TenTec/2008-05/msg00417.html (10,036 bytes)
35. Re: [TenTec] Low Pass Filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 20 May 2008 11:36:31 -0600; And the french horn is the most treacherous with common valving for adjacent notes throughout much of its register. Like the top octave of the tuba. The parallels between radio and acoustics are far; /archives//html/TenTec/2008-05/msg00418.html (11,705 bytes)
36. Re: [TenTec] Low Pass Filter (score: 1): Author: "Bob Close" <rclose@nhwisp.com>; Date: Tue, 20 May 2008 13:56:42 -0400; Trombone players exhibit stronger parallels to CB operators--they tend to use "sliders" to change frequency. :) Now, trumpet players....they are old-school, since they use three valves. I wonder wher; /archives//html/TenTec/2008-05/msg00420.html (10,844 bytes)
37. Re: [TenTec] Low Pass Filter (score: 1): Author: Rick Denney <rick@rickdenney.com>; Date: Tue, 20 May 2008 14:18:01 -0400; Bob Close writes... A trumpet is a partial trombone. To make those three valves work, you have to push the first and third valve slides in and out to correct all the errors of having only three valve; /archives//html/TenTec/2008-05/msg00423.html (10,502 bytes)
38. Re: [TenTec] Low Pass Filter (score: 1): Author: ron <roncasa@verizon.net>; Date: Tue, 20 May 2008 16:02:40 -0400; maw hahahahaha! we TT guys know how to have fun .... Ron _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2008-05/msg00426.html (9,542 bytes)
39. Re: [TenTec] Low Pass Filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 20 May 2008 15:49:42 -0600; So you reach over with your free hand a slide the slide tuner in and out to fix the remaining errors. Many I've seen (but not mine) slide as easily as a trombone slide. My old Eb big bore Holton tuba; /archives//html/TenTec/2008-05/msg00429.html (11,935 bytes)
40. [TenTec] Low Pass Filter (score: 1): Author: "Doug Turnbull" <turnbull@net1.ie>; Date: Tue, 20 May 2008 23:00:25 +0100; Hi All, I take the point that if one local TV is not being interfered with on any of the channels that the transmitter is not at fault. At the moment I am suffering from TVI on the 160 Meter band onl; /archives//html/TenTec/2008-05/msg00430.html (10,676 bytes)

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