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1. Re: [Amps] Getting rid of blower noise - analternate coolingschemeusing the phase transition of liquid carbon dioxide (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Thu, 22 Feb 2007 23:03:26 -0500; I saw a documentary that delved into the paint used on the Hindenburg. They claimed it included aluminum power and some other chemical (butyl?) that made it approximate rocket fuel. They found a patc; /archives//html/Amps/2007-02/msg00369.html (8,838 bytes)
2. Re: [Amps] Fw: Step Start on a 3KA Amp (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Fri, 22 Sep 2006 17:15:39 -0400; You clipped the test conditions from my original email In some modeling with a 4000V supply with 50 Ohms equivalent series secondary resistance and 20 uFd of capacitance, the single cycle peak capaci; /archives//html/Amps/2006-09/msg00287.html (10,013 bytes)
3. Re: [Amps] Fw: Step Start on a 3KA Amp (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Thu, 21 Sep 2006 18:25:17 -0400; I tried the zero crossing switch on two HV power supplies (8877 and GS35B), both power up just fine, nice and quiet, no blinking lights. Using a zero crossing switch makes a significant difference co; /archives//html/Amps/2006-09/msg00273.html (8,256 bytes)
4. Re: [Amps] Parasitic supressor SIDE BAR (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Thu, 31 Aug 2006 16:19:31 -0400; Within the Thunderbird email client, create a rule such as for incoming messages, MATCH ANY OF THE FOLLOWING when BODY of email CONTAINS "parasitics" MOVETO folder "parasitics" when BODY of email CON; /archives//html/Amps/2006-08/msg00838.html (7,625 bytes)
5. Re: [Amps] W6PO 2m amplifier - input circuit adjustment (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sat, 17 Jun 2006 23:51:44 -0400; I had the problem with an 8877 on 2M. The input tuning drifted somehow and having only one adjustment wouldn't bring it back in line. I wanted to design a pi or pi-L network with two cap's to ground; /archives//html/Amps/2006-06/msg00313.html (9,234 bytes)
6. Re: [Amps] Components Causing Distortion in Amplifiers (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Tue, 10 Jan 2006 22:26:17 -0500; Right. All the voltage need to have low impedance across the audio spectrum. The classic test for uses uses the two tone intermodulation test method and sweeps the spacing of the two tones from about; /archives//html/Amps/2006-01/msg00331.html (12,170 bytes)
7. Re: [Amps] Need Help build Nonlinear Amplifier (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 18 Dec 2005 13:48:38 -0500; ...not sure I understand you're question. These articles shows the block diagram for classic analog pre-distort. http://doi.wiley.com/10.1002/mop.11292 http://www.highfrequencyelectronics.com/Archive; /archives//html/Amps/2005-12/msg00247.html (8,340 bytes)
8. Re: [Amps] GS-35B tuned input (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Mon, 21 Nov 2005 22:17:02 -0500; Al... You didn't mention what band the Amp has to run. But in any case, do you know about the Russian Tube QRO site? http://www.nd2x.net/base-1.html jeff, wa1hco _____________________________________; /archives//html/Amps/2005-11/msg00419.html (7,381 bytes)
9. Re: [Amps] power transformer (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 06 Nov 2005 11:08:41 -0500; Tom Transformers provide power measured in watts. 300 VCT at 250 MA means about 75 watts, plus 250V at 280 mA means another 70 watts. So, in continuous commercial service, it put out about 145W plus; /archives//html/Amps/2005-11/msg00077.html (9,044 bytes)
10. Re: [Amps] schematic software? (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Wed, 02 Nov 2005 22:55:48 -0500; Eagle, from CadSoft, has a tube library. jeff, wa1hco _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-11/msg00041.html (7,802 bytes)
11. Re: [Amps] caps for W6PO design (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Fri, 07 Oct 2005 21:53:04 -0400; Input or output caps? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-10/msg00177.html (7,380 bytes)
12. Re: [Amps] W6PO (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Thu, 06 Oct 2005 23:46:42 -0400; Paul... I've worked on 144 and 220 W6PO amplifiers that use some kit parts. I wonder if it's the same? Do you have any pictures of the parts? The amplifiers presently live off site so I can't send yo; /archives//html/Amps/2005-10/msg00168.html (7,815 bytes)
13. Re: [Amps] Alpha releases New Amp 9500 (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Fri, 16 Sep 2005 09:02:37 -0400; "Serial port for remote control"!? We did enter the 21st century quite a while back. The Alpha 9500 needs to replace the serial port for remote control with USB. * Very soon PC's won't even have a se; /archives//html/Amps/2005-09/msg00136.html (8,767 bytes)
14. Re: [Amps] !44Mhz Gi7B amp problems continued (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 21 Aug 2005 19:45:57 -0400; Sean Williams wrote: Hi Jeff, Yep, thats the design, with the obvious bloopers removed. What bloopers? I noticed from the picture that you replaced the output coupling cap with a disk. The schematic; /archives//html/Amps/2005-08/msg00646.html (9,051 bytes)
15. Re: [Amps] !44Mhz Gi7B amp problems continued (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 21 Aug 2005 15:11:41 -0400; Sean Is this the design at http://nd2x.net/yu1aw/GI7B-2m-LB-skem.GIF? What did you use for the output tune and load capacitors? Does the output tune exhibit a sharp dip with some peaking of output? A; /archives//html/Amps/2005-08/msg00641.html (8,813 bytes)
16. Re: [Amps] Ribbon Beam Amplifiers (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Mon, 15 Aug 2005 22:40:00 -0400; The requirement would be for 60 dB or better after correction...and enough stability to ensure the correction actually works. In talking to them...they hadn't gotten that far, yet. BTW, we use feedfo; /archives//html/Amps/2005-08/msg00539.html (7,789 bytes)
17. Re: [Amps] Ribbon Beam Amplifiers (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Mon, 15 Aug 2005 08:19:48 -0400; I met with Chiping about a year ago to discuss this technology...It's still very early in the game. The key requirements for application to cellular networks include * Greater than 13 dB peak to aver; /archives//html/Amps/2005-08/msg00517.html (7,927 bytes)
18. Re: [Amps] Heath SB1000 problem (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sat, 02 Jul 2005 18:47:23 -0400; Roger... Try connecting one end of the 10V winding to ground and see if it still blows fuses. It might be normal to see 1000V on that winding with an extremely high impedance meter. If the winding ha; /archives//html/Amps/2005-07/msg00013.html (10,950 bytes)
19. Re: [Amps] Arcos 2M Amp Built by W2GN (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Fri, 03 Jun 2005 18:49:58 -0400; Joe... Fred Merry was a fine craftsman and built a series of excellent VHF, UHF amplifiers using stripline construction techniques. Prior to Fred's work most amplifiers uses push-pull techniques and; /archives//html/Amps/2005-06/msg00017.html (8,200 bytes)
20. [Amps] IC-746Pro Timing between SEND output and RF (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 22 May 2005 15:03:12 -0400; To followup on a previous question about the timing between the Send signal on the back and RF output... After a bit of measuring in SSB, FM and CW breakin, the RF starts 10 msec after Send goes low; /archives//html/Amps/2005-05/msg00251.html (6,640 bytes)

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