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1. [Amps] 8877 blower requirement ? (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Thu, 05 Apr 2007 08:51:00 -0400; I have just about finished building a W6PO style 8877 amplifier for 2 metres and I now need to install a blower. I have a 2C610 (140 CFM) and a 4C440 (60 CFM) and I'm wondering which one, if either,; /archives//html/Amps/2007-04/msg00009.html (6,765 bytes)
2. Re: [Amps] 8877 blower requirement...TXN ! Now..Airflow sensing ? (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Mon, 09 Apr 2007 09:51:00 -0400; Thanks for all the replies, public and private regarding 8877 blower requirement. I received plenty of good information and gained a better understanding of how to properly size a blower. I'm going t; /archives//html/Amps/2007-04/msg00037.html (6,943 bytes)
3. Re: [Amps] 8877 blower requirement -airflow switch (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Thu, 12 Apr 2007 12:28:43 -0400; I saw a variation of this on the 'net. It uses the filament of a #47 light bulb (with the glass carefully broken and removed) as a temperature sensor. A constant current source heats up the filament; /archives//html/Amps/2007-04/msg00093.html (8,251 bytes)
4. [Amps] Honeycomb screen material (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Tue, 17 Apr 2007 21:10:38 -0400; I'm looking for some RF screen material for the blower air inlet and air exhaust ports of my W6PO 2m amplifier project. I need a couple of (approx) 6" x 6" pieces of honeycomb (hex) aluminum shield m; /archives//html/Amps/2007-04/msg00189.html (6,788 bytes)
5. [Amps] 2m W6PO input T network tuning. (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Fri, 27 Apr 2007 13:53:29 -0400; I'm trying to get the L-C-L "T network" input circuit of my newly built W6PO 2m amp to look like 50 ohms at 144 MHz. The network consists of two series inductors with a variable shunt capacitor in th; /archives//html/Amps/2007-04/msg00342.html (7,571 bytes)
6. Re: [Amps] 2m W6PO input T network tuning....Problem solved ! (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Sat, 28 Apr 2007 23:58:45 -0400; Thanks for the replies to my original post, both privately and via the lists. There were some good ideas but none of them seemed to work for me. After a little experimentation and frustration I final; /archives//html/Amps/2007-04/msg00360.html (9,172 bytes)
7. Re: [Amps] 2m W6PO input T network tuning....Problem solved ! (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Sun, 29 Apr 2007 16:11:20 -0400; Brass shim is what I will be using Dan. I said "shorting bars" but I didn't mean to imply that I would use brass bar ;) 73 de Hugh VA3TO www.va3to.com _______________________________________________; /archives//html/Amps/2007-04/msg00367.html (11,230 bytes)
8. [Amps] W6PO 2m amp (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Wed, 09 May 2007 18:31:46 -0400; Hello all ! I'm testing the homebrew W6PO amp that I just completed and I seem to be having trouble getting more than 300 watts out of it. Before I powered it up I tuned the input and output sections; /archives//html/Amps/2007-05/msg00092.html (7,130 bytes)
9. Re: [Amps] W6PO 2m amp (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Wed, 09 May 2007 21:48:32 -0400; Many thanks for all the replies. I'm still digesting most of it but there were some common threads (low drive due to exciter foldback). First, to answer some questions; - The FT-847 can deliver 50 wa; /archives//html/Amps/2007-05/msg00100.html (7,942 bytes)
10. [Amps] AL-811H conversion ? (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Sun, 15 Jul 2007 08:56:55 -0400; I have the opportunity to aquire an Ameritron AL-811H that needs a new transformer for the HVPS. I could get a replacement xformer but before I do that, I'm wondering if I could use it as a basis to; /archives//html/Amps/2007-07/msg00243.html (6,612 bytes)
11. [Amps] Commander plate voltage readings ? (score: 1): Author: hduff@cogeco.ca; Date: Mon, 16 Jul 2007 14:48:49 -0400; Is there a known issue with low plate voltage readings on Commander amplifiers ? A friend of mine owns a VHF-1200 and a VHF-2000. Both read quite low on the front panel plate voltage meter. i.e. 1900; /archives//html/Amps/2007-07/msg00275.html (6,691 bytes)
12. [Amps] Decent AL-811H schematic ? (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Mon, 16 Jul 2007 19:58:52 -0400; Does anyone have a good readable schematic for the Ameritron AL-811H that wasn't done in Crayon-CAD ? The one in the manual is pathetic. (You would think they could splurge for a real schematic captu; /archives//html/Amps/2007-07/msg00282.html (6,744 bytes)
13. Re: [Amps] Decent AL-811H schematic ? (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Mon, 16 Jul 2007 21:10:08 -0400; I guess my standards are too high ;) 73 de Hugh VA3TO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-07/msg00286.html (8,031 bytes)
14. Re: [Amps] Decent AL-811H schematic ? (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Tue, 17 Jul 2007 07:47:30 -0400; Yes I know, glass tubes are for girls :) I got this AL-811H to repair and flip. 73 de Hugh VA3TO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2007-07/msg00295.html (9,163 bytes)
15. [Amps] F.S. 2m Kilowatt Tetrode amp (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Thu, 26 Jul 2007 21:14:52 -0400; Homebrew 2m Kilowatt amplifier based on ARRL Handbook construction article "A Legal-Limit 2-Meter Tetrode Amplifier". Rated to deliver 1KW out for 10 watts in. Well built; Mechanically ready, needs a; /archives//html/Amps/2007-07/msg00450.html (6,825 bytes)
16. [Amps] SB-201 "King Conversion" to 6m ? (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Sat, 25 Aug 2007 07:29:32 -0400; Does anyone have details on what is done in the 6m King conversion to an SB-200 or 201 ? 73 de Hugh VA3TO _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2007-08/msg00175.html (6,396 bytes)
17. Re: [Amps] QRO or Commander (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Fri, 07 Sep 2007 15:14:23 -0400; Some people go on about how friendly and helpful Pat Stein at QRO is. I recently inquired about upgrading my VHF-1200 to a VHF-2000 and he all but told me he was too busy filling orders to deal with; /archives//html/Amps/2007-09/msg00082.html (9,551 bytes)
18. Re: [Amps] QRO or Commander (correction) (score: 1): Author: Hugh VA3TO <hduff@cogeco.ca>; Date: Fri, 07 Sep 2007 16:55:12 -0400; My mistake. My comments were regarding Pat Stein of Command Technologies. My apologies to the people at QRO. 73 de Hugh VA3TO _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2007-09/msg00087.html (6,208 bytes)

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