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1. [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Wed, 10 May 2006 19:54:32 -0400; I'll go peruse the archives again but I'm going to post this here anyway. I noticed while on 20m tonight running about a kw that the tank coil was getting HOT, one of the wires connected to it (the 2; /archives//html/Amps/2006-05/msg00070.html (7,211 bytes)
2. Re: [Amps] tank coil heating (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 10 May 2006 22:55:51 -0400; Chuck, If the tank coil is copper tubing I come up with a way of cooling them if you have a pressureized chassis by a blower. What you do is take a piece of teflon rod or something similar that's RF; /archives//html/Amps/2006-05/msg00071.html (10,279 bytes)
3. Re: [Amps] tank coil heating (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 10 May 2006 23:13:45 -0700; N4700 is not designed for tuned circuits, it's for coupling and bypassing. N750 and NPØ are for tuned circuits. Cheers, Chuck R L MEASURES, AG6K. 805-386-3734 r@somis.org _____________________; /archives//html/Amps/2006-05/msg00072.html (8,833 bytes)
4. Re: [Amps] tank coil heating (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 11 May 2006 09:34:56 +0200 (CEST); bypassing. < Figure that you can have 10 or 20 amps of RF running through that cap, so you can easily get a fair amount of dissipation in it. The application needs an NP0 cap. 73 Peter G3RZP - will b; /archives//html/Amps/2006-05/msg00074.html (7,394 bytes)
5. Re: [Amps] tank coil heating (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Thu, 11 May 2006 06:42:21 -0700; ORIGINAL MESSAGE: ** REPLY SEPARATOR ** Voltage rating has nothing to do with current carrying capacity, as you have learned. Get a capacitor rated for the expected current, or better yet, an air or; /archives//html/Amps/2006-05/msg00075.html (7,501 bytes)
6. Re: [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Thu, 11 May 2006 10:06:22 -0400; another box of stuff to bring back from dayton :) ORIGINAL MESSAGE: ** REPLY SEPARATOR ** Voltage rating has nothing to do with current carrying capacity, as you have learned. Get a capacitor rated f; /archives//html/Amps/2006-05/msg00076.html (8,139 bytes)
7. Re: [Amps] tank coil heating (score: 1): Author: "S. J. Blackwell" <w5lu@hotmail.com>; Date: Thu, 11 May 2006 09:55:31 -0500; The current carrying capacity does not correlate well with voltage or capacity in question. It would also be wise to parallel several caps rather than having one cap carry all current. You might be s; /archives//html/Amps/2006-05/msg00077.html (9,177 bytes)
8. Re: [Amps] tank coil heating (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 11 May 2006 18:54:04 +0200; If you don't disconnect the parallel fixed padder across the C2 in the Pi-network on 14 MHz, you may end up in serious heating trouble, as well as using a very unsuitable operating point for the PA t; /archives//html/Amps/2006-05/msg00078.html (10,626 bytes)
9. Re: [Amps] tank coil heating (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Thu, 11 May 2006 17:09:55 GMT; Hi Chuck, I looked at your photos (nice work!) and it appears that you are using a piece of Airdux with perhaps #12 size conductor. That is a mite small for 20 meters. I'd suggest upsizing the 20 met; /archives//html/Amps/2006-05/msg00079.html (10,295 bytes)
10. Re: [Amps] tank coil heating (score: 1): Author: "Angelo Karabetsos" <ve3yn@hotmail.com>; Date: Thu, 11 May 2006 17:13:22 +0000; I agree, multiple parallel NPO caps may do the trick. Here's a useful link. http://www.mgs4u.com/RF-Microwave/doorknob-capacitors.htm _________________________________________________________________; /archives//html/Amps/2006-05/msg00080.html (8,202 bytes)
11. Re: [Amps] tank coil heating (score: 1): Author: "Angelo Karabetsos" <ve3yn@hotmail.com>; Date: Fri, 12 May 2006 01:31:55 +0000; Hello Chuck, I took a look at your homepage, great site by the way. I noticed the chimney isn't extended to the top of the tank enclosure and it's in close proximity of the plate choke and DC blockin; /archives//html/Amps/2006-05/msg00082.html (8,509 bytes)
12. Re: [Amps] tank coil heating (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 11 May 2006 21:51:04 -0400; Karl-Arne's right. I didn't look at the schematic and photos until now. The only time we ever paralelled two and left them permenantly connected was for a mono-band amp. We used to use two air variab; /archives//html/Amps/2006-05/msg00083.html (13,388 bytes)
13. Re: [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Fri, 12 May 2006 07:17:31 -0400; Good Info on all the responses I'm figuring out more as I go along. I DO have a chimney made up that comes off. things have changed some. I'll retake more up to date pics and post them there. I'm onl; /archives//html/Amps/2006-05/msg00084.html (9,703 bytes)
14. Re: [Amps] tank coil heating (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 12 May 2006 05:24:34 -0700; N750s are also suitable for tuned circuit applications. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2006-05/msg00085.html (9,226 bytes)
15. Re: [Amps] tank coil heating (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 12 May 2006 05:32:37 -0700; I have seen commercial transmitters with 16 paralleled NPØ doorknob caps mounted between two square plates. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________; /archives//html/Amps/2006-05/msg00086.html (10,781 bytes)
16. Re: [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Fri, 12 May 2006 09:40:48 -0400; well, thats the #1 item for me to find at the dayton hamfest... I know with 25k+ attendance it shouldn't be hard to find a 2m freq where people hang out at! I use 147.450s mostly at local fleas... an; /archives//html/Amps/2006-05/msg00087.html (9,304 bytes)
17. Re: [Amps] tank coil heating (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Fri, 12 May 2006 18:15:20 +0200; Hi Chuck, I visited your website today and had a look on you project. So far a nice job as your first amp! Connect the padder cap to the 80m switch position only, then it will be in circuit when you; /archives//html/Amps/2006-05/msg00089.html (10,455 bytes)
18. Re: [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Mon, 15 May 2006 12:42:50 -0400; What is the issue(s) with using only toroids for a tank circuit? (thinking out loud ) chuck _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2006-05/msg00101.html (7,994 bytes)
19. Re: [Amps] tank coil heating (score: 1): Author: "Partain, Chuck" <Chuck_Partain@maxtor.com>; Date: Mon, 15 May 2006 20:23:12 -0400; What is the issue(s) with using only toroids for a tank circuit? (thinking out loud ) chuck _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2006-05/msg00104.html (7,967 bytes)
20. Re: [Amps] tank coil heating (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Tue, 16 May 2006 16:29:47 GMT; Hi Chuck, We had a bit of a discussion about that idea here a couple years ago. Take a look at the thread starting with: http://lists.contesting.com/_amps/2003-02/msg00468.html In your application, I; /archives//html/Amps/2006-05/msg00112.html (8,935 bytes)

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