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21. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 6 Dec 2013 05:47:07 -0800; It?s quite simple without measurements. Lets assume the amp is tuned for full legal output into a low SWR on 80m which needed 1000pf of load capacitance. Then suddenly the SWR goes sky high because t; /archives//html/Amps/2013-12/msg00049.html (11,461 bytes)
22. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 6 Dec 2013 10:21:59 -0500; It?s quite simple without measurements. Lets assume the amp is tuned for full legal output into a low SWR on 80m which needed 1000pf of load capacitance. Then suddenly the SWR goes sky high because t; /archives//html/Amps/2013-12/msg00050.html (13,692 bytes)
23. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 06 Dec 2013 17:23:54 +0000; Hi all, If one is to believe Philip H. Smith in 'Electronic Applications of the Smith Chart', McGraw-Hill 1969, page 6, Fig 1.3, the maximum voltage appearing on a lossless transmission line with an; /archives//html/Amps/2013-12/msg00051.html (12,825 bytes)
24. [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 6 Dec 2013 10:54:06 -0800; ** The coax isnt long enough to act as a transmission line at HF....in most amps anyway. PI net load cap values change asap. Ditto with coax...and only 1 end of shield bonded to chassis. ** All the c; /archives//html/Amps/2013-12/msg00053.html (7,826 bytes)
25. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Fri, 6 Dec 2013 12:37:12 -0700; I have always thought that for lengths much less than a wavelength, the impedance looking into a transmission line is dominated by the impedance of the load connected to the end of the line. The char; /archives//html/Amps/2013-12/msg00054.html (9,549 bytes)
26. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: TexasRF@aol.com; Date: Fri, 6 Dec 2013 15:00:44 -0500 (EST); Hi All, there is one gotcha using the strap or wire and that is where you route it through a metallic panel/ chassis etc to get rf from one side of the panel to the other. The ground return doesn't w; /archives//html/Amps/2013-12/msg00055.html (11,616 bytes)
27. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 6 Dec 2013 20:39:50 -0500; between the load cap and the TR relay. And with shield bonded to chassis at BOTH ends. If wire or cu strap is used instead...then u end up with a huge Z bump. ** The coax isnt long enough to act as; /archives//html/Amps/2013-12/msg00056.html (9,751 bytes)
28. [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 7 Dec 2013 05:21:58 -0800; With all your bluster you still dont get it. All you are using is a short piece of shielded cable, impedance has no bearing since it is too short to present a meaningful reactance. Your load cap chan; /archives//html/Amps/2013-12/msg00057.html (8,086 bytes)
29. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: Louis Parascondola <gudguyham@aol.com>; Date: Sat, 7 Dec 2013 08:46:45 -0500 (EST); Jim, if you know this to be true why do you call it a theory? Just wondering. a 50 ohm resistor.... then wire from top of resistor with strap, wire etc, over to a coax connector......then on to the M; /archives//html/Amps/2013-12/msg00058.html (8,588 bytes)
30. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: TexasRF@aol.com; Date: Sat, 7 Dec 2013 09:30:52 -0500 (EST); Hey guys,. this is the kind of thing that can easily be modeled and derive some factual data. If a 50R load is connected to the amplifier output then through a strap, wire or coax of a given length,; /archives//html/Amps/2013-12/msg00059.html (11,078 bytes)
31. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: TexasRF@aol.com; Date: Sat, 7 Dec 2013 09:48:17 -0500 (EST); re: lower v.f. should read higher v.f. My bad/sorry, Gerald K5GW In a message dated 12/7/2013 8:30:52 A.M. Central Standard Time, TexasRF@aol.com writes: Hey guys,. this is the kind of thing that can; /archives//html/Amps/2013-12/msg00060.html (10,985 bytes)
32. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: donroden@hiwaay.net; Date: Sat, 07 Dec 2013 08:58:23 -0600; And just to hijack this further, I think it's more important to have a wide uninterrupted copper ground plane between the major components ... input / cathode/tuning cap/loading cap/ output connector; /archives//html/Amps/2013-12/msg00061.html (12,072 bytes)
33. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 7 Dec 2013 10:36:26 -0500; I havent even seen a theory espoused yet, just some ramblings. Jim, if you know this to be true why do you call it a theory? Just wondering. with a 50 ohm resistor.... then wire from top of resistor; /archives//html/Amps/2013-12/msg00062.html (10,352 bytes)
34. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 7 Dec 2013 10:36:29 -0500; Hey guys,. this is the kind of thing that can easily be modeled and derive some factual data. If a 50R load is connected to the amplifier output then through a strap, wire or coax of a given length,; /archives//html/Amps/2013-12/msg00063.html (13,683 bytes)
35. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 9 Dec 2013 06:17:35 -0800; do use strap, what will work is .75 inch wide cu strap...and space it exactly .3125 inch above the chassis, then its 50 ohms. RG-393 teflon coax works good too. end up with the eq of 250-500 ohms. T; /archives//html/Amps/2013-12/msg00067.html (12,174 bytes)
36. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Mon, 9 Dec 2013 19:38:33 +0100; No one building a 15KW amp will be that stupid to use 10-12 ga wire to connect the pi to the antenna. And that wire must be very long that you can measure a Z of 250-500 ohm. On the amps by Telefunke; /archives//html/Amps/2013-12/msg00068.html (8,526 bytes)
37. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 9 Dec 2013 15:21:53 -0500; Youre wasting your time arguing with Jim, he is in his own rut and doesnt even read what and understand what others are saying. Carl KM1H No one building a 15KW amp will be that stupid to use 10-12 g; /archives//html/Amps/2013-12/msg00069.html (9,797 bytes)
38. [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 12 Dec 2013 05:57:19 -0800; inch wide,with a 50 ohm globar at far left side, globar mounted vertical. Strap is 3 inchs above chassis at globar end, and slopes down to 2 inches above chassis at far right hand side.... terminatin; /archives//html/Amps/2013-12/msg00096.html (10,507 bytes)
39. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 12 Dec 2013 09:58:20 -0500; is .25 inch wide,with a 50 ohm globar at far left side, globar mounted vertical. Strap is 3 inchs above chassis at globar end, and slopes down to 2 inches above chassis at far right hand side.... ter; /archives//html/Amps/2013-12/msg00098.html (12,489 bytes)

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