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1. [Amps] pi-net spreadsheet question (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 05 Apr 2010 23:03:33 -0700; I'm using the GM3SEK pi-net design spreadsheet <http://www.ifwtech.co.uk/g3sek/>. It requires that you enter the inductance and resistance used in the parasitic suppressor. What I'm wondering is how; /archives//html/Amps/2010-04/msg00146.html (7,538 bytes)
2. [Amps] pi-net spreadsheet question (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 7 Apr 2010 05:30:16 -0700; pi-net spreadsheet question I'm using the GM3SEK pi-net design spreadsheet <http://www.ifwtech.co.uk/g3sek/>. It requires that you enter the inductance and resistance used in the parasitic suppressor; /archives//html/Amps/2010-04/msg00187.html (11,577 bytes)
3. Re: [Amps] pi-net spreadsheet question (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 07 Apr 2010 08:09:51 -0700; Great information, very helpful! This is so much better than trying to figure this out while soldering taps on the coil, cutting tubing, etc. I am also wondering whether I will need parasitic suppres; /archives//html/Amps/2010-04/msg00194.html (14,102 bytes)
4. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 08:57:36 -0700; ORIGINAL MESSAGE: REPLY: The trick in avoiding the need for parasitic suppressors in the anode is to make the input impedance (cathode to grounded grid) very low at VHF. Make it low enough and the tu; /archives//html/Amps/2010-04/msg00197.html (9,001 bytes)
5. Re: [Amps] pi-net spreadsheet question (score: 1): Author: donroden@hiwaay.net; Date: Wed, 07 Apr 2010 11:14:12 -0500; Half wave coaxial stub ? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-04/msg00198.html (7,491 bytes)
6. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 7 Apr 2010 13:05:08 -0400; Vic, Ground the grids at the bottom, direct to the chassis as close to the tube sockets as manageable. The chassis serves as a large low inductance ground plane for grounding the grids and the plate; /archives//html/Amps/2010-04/msg00201.html (16,868 bytes)
7. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 11:45:22 -0700; ORIGINAL MESSAGE: REPLY: Or the grid circuit. It takes both to tango (oscillate). 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2010-04/msg00212.html (8,650 bytes)
8. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 7 Apr 2010 14:45:20 -0400; I dont know the parasitic frequency but a new 813 will work fine on 6M as will a 811 and 572B. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2010-04/msg00213.html (18,645 bytes)
9. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 7 Apr 2010 14:49:21 -0400; Suppressors wont hurt anything and can protect the amp. Unless you are running matched tubes one will have higher gain and just might decide to become unstable. Carl KM1H ____________________________; /archives//html/Amps/2010-04/msg00215.html (16,372 bytes)
10. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 11:49:41 -0700; ORIGINAL MESSAGE: REPLY: Yes, except it's bulky and harder to tune, but theoretically should do the job. I would prefer a series L-C circuit using a very small bread-slicer type variable cap, with th; /archives//html/Amps/2010-04/msg00217.html (8,946 bytes)
11. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 11:56:17 -0700; ORIGINAL MESSAGE: REPLY: Suppressors are notorious for the resistor changing value. If it decreases to a low enough value, guess what? No suppressor. If the resistor increases value enough, same thin; /archives//html/Amps/2010-04/msg00218.html (8,443 bytes)
12. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 7 Apr 2010 16:02:14 -0400; Not really. Even a 2W carbon takes decades when the suppressor is designed and not just shotguned. Modern resistors dont change at all....yet. If it Thats not the change direction. And below a certa; /archives//html/Amps/2010-04/msg00222.html (9,543 bytes)
13. Re: [Amps] pi-net spreadsheet question (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 07 Apr 2010 15:06:09 -0700; My 813's are matched...by cost. They were free. One that I bought on ebay had an (obviously) broken filament. I'm sticking with the free ones. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______; /archives//html/Amps/2010-04/msg00234.html (8,505 bytes)
14. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 7 Apr 2010 19:03:03 -0400; I kind of guessed that (-; Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-04/msg00240.html (8,748 bytes)
15. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 18:54:02 -0700; ORIGINAL MESSAGE: REPLY: I don't know what planet your carbon resistors come from but I have spent much of my adult life changing low-value high wattage carbon resistors, and I guarantee you they can; /archives//html/Amps/2010-04/msg00247.html (9,736 bytes)
16. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 19:10:02 -0700; ORIGINAL MESSAGE: REPLY: Let me get this straight: Resistors don't change in the lower value direction and when they do below a certain value they burn up. Right? 73, Bill W6WRT _____________________; /archives//html/Amps/2010-04/msg00249.html (9,146 bytes)
17. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 07 Apr 2010 22:39:47 -0700; ORIGINAL MESSAGE: REPLY: What kind of core do you recommend for a parasitic suppressor? Air core, iron core or rabbit's foot core? 73, Bill W6WRT _______________________________________________ Amps; /archives//html/Amps/2010-04/msg00254.html (8,941 bytes)
18. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 8 Apr 2010 10:08:34 -0400; Apparently your experience is rather limited. Yes they can go down but from RF heating and overvoltage the common course is up. You might want to add that to your tech notes file. And will continue; /archives//html/Amps/2010-04/msg00260.html (10,906 bytes)
19. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 8 Apr 2010 10:25:29 -0400; Which ever one fits where my steel toed boots are aimed. Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-04/msg00261.html (9,319 bytes)
20. Re: [Amps] pi-net spreadsheet question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Thu, 08 Apr 2010 14:02:51 -0700; ORIGINAL MESSAGE: REPLY: Well, you DO have a sense of humor. I was worried. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte; /archives//html/Amps/2010-04/msg00274.html (9,048 bytes)

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