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1. [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Thu, 9 Mar 2006 08:15:25 -0800 (PST); Hello Amp Users, I have a homebrew 4-1000A amplifier that works perfect on every band but 20 meters. When I attempt to load it arcs lightly on the 20 meter band switch. The current parasitic suppress; /archives//html/Amps/2006-03/msg00230.html (7,490 bytes)
2. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Thu, 9 Mar 2006 08:57:20 -0800; Mike -- The VHF parasite suppressor you described probably has a Q of c. 5 at the anode's self resonance. In my experiences, a suppressor with a Q of c. 1.5 will provide fewer fireworks than conventi; /archives//html/Amps/2006-03/msg00232.html (8,874 bytes)
3. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: "Saandy" <alexeban@bezeqint.net>; Date: Fri, 10 Mar 2006 11:35:23 +0200; ....yeah! Now, you have arching, like you wanted (HI). It probably needs more inductance in the suppressor. According to W6SAI (blessed his memory), the 4-1000 needs 4 turns, 16 gage, ½ inch d; /archives//html/Amps/2006-03/msg00237.html (8,844 bytes)
4. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 10:12:04 +0000; I'm intruiged by this, and I'm wondering if I'm misunderstanding something. As I understand it, the tube doesn't oscillate in isolation - it's a combination of several factors, including the impedanc; /archives//html/Amps/2006-03/msg00238.html (8,094 bytes)
5. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Fri, 10 Mar 2006 03:31:16 -0800; The optimal suppressor design is that which almost melts down the suppressor resistor at 29MHz, Adding L increases dissipation at 29MHz, decreases the parallel-equivalent resistance seen by the anode; /archives//html/Amps/2006-03/msg00242.html (9,335 bytes)
6. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 12:23:45 +0000; I can see that gives you a 'standard' design for any given plate load impedance - not necessarily for a specific tube. Depending on the frequency and excess gain to be killed, it might not be necessa; /archives//html/Amps/2006-03/msg00243.html (9,163 bytes)
7. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Fri, 10 Mar 2006 10:18:47 -0800; Heat dissipation at 29MHz is a fair indicator of whether or not it will adequately suppress VHF energy. If a VHF suppressor does not get hellishly hot at 29MHz, it is unlikely to absorb energy above; /archives//html/Amps/2006-03/msg00247.html (10,851 bytes)
8. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: "Saandy" <alexeban@bezeqint.net>; Date: Fri, 10 Mar 2006 21:09:45 +0200; ?.i?ll try to explain. First of all, it?s perfectly true that each and every amplifier has its own peculiarities and its own particular solution. What I tried to stress is the fact that this tube nee; /archives//html/Amps/2006-03/msg00249.html (11,581 bytes)
9. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 21:19:21 +0000; Depending on how much energy and at what frequency, it might not need to get that hot at 29MHz. If you can't make the measurements, then it's better to play safe - but that can be an open door for fo; /archives//html/Amps/2006-03/msg00252.html (8,634 bytes)
10. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 11 Mar 2006 08:15:09 +0100 (CET); It does increase the effective series resistance. Rs=Rp/[1+(Rp/Rs)*2] 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2006-03/msg00264.html (8,072 bytes)
11. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 11 Mar 2006 04:11:37 -0800; On Mar 10, 2006, at 1:19 PM, Steve Thompson wrote: R; Measures wrote: If a VHF suppressor does not get hellishly hot at 29MHz, it is unlikely to absorb energy above 30MHz . Depending on how much ener; /archives//html/Amps/2006-03/msg00266.html (10,673 bytes)
12. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 11 Mar 2006 04:24:22 -0800; Indeed, Peter, and increasing series-R decreases parallel-equivalent R - which decreases amplification, which ameliorates the negative effect of the electron tube's C-feedback, and that is what VHF s; /archives//html/Amps/2006-03/msg00268.html (8,463 bytes)
13. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 13 Mar 2006 08:07:16 +0000; I think that should be ...(Rp/Xp)*2] Rp=(Rs^2+Xs^2)/Rs. If my rusty maths serves me, when Xs<Rs increasing Rs increases Rp. Steve _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2006-03/msg00318.html (8,471 bytes)
14. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Mon, 13 Mar 2006 01:46:58 -0800; Getting from series-R to parallel-equivalent-R is not as simple as it first looks. -- see page 27, March, 1989 *QST*, "Calculating Power Dissipation in Parasitic Suppressor Resistors". cheerz, Steve; /archives//html/Amps/2006-03/msg00319.html (9,400 bytes)
15. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 13 Mar 2006 10:34:18 +0000; Sure, there's lots of things to take into account, but the ac analysis rules remain the same. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2006-03/msg00320.html (8,177 bytes)

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