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References: [ 19 ]

Total 19 documents matching your query.

1. [Amps] Tubes vs. Solid State (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 2 May 2012 12:48:13 -0700
COTS heat pipe vapor phase devices are sealed, closed loop systems which are pre-evacuated at the time of manufacture so the volatile liquid which isn't necessarily water, boils just above room tempe
/archives//html/Amps/2012-05/msg00080.html (10,022 bytes)

2. [Amps] 1 Kw PS (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 16 May 2012 15:23:14 -0700
I have four Harris PP-7913/URC power supplies which my wife has declared surplus. They output 3000 Vdc at 1 Amp, and 13.5 Vdc at 8 Amps intended to power an 8877 in a grounded grid configuration whos
/archives//html/Amps/2012-05/msg00290.html (6,647 bytes)

3. Re: [Amps] Buck-Boost Transformer Selection (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 25 Jun 2014 12:12:13 -0700
The American National Standard for Electric Power Systems and Equipment allows the service range for nominal 240 VAC mains to be 228 - 252 VAC. The utilization range extends to 254.4 VAC. Find the re
/archives//html/Amps/2014-06/msg00081.html (9,252 bytes)

4. Re: [Amps] Linearization problem (score: 1)
Author: "Doug Ronald" <>
Date: Fri, 5 Dec 2014 09:58:39 -0800
Chuck Wenzel came up with a couple HF isolators that might be of use. Here are the links: This one is an RF Design award winner, and can achieve 60 dB of
/archives//html/Amps/2014-12/msg00037.html (17,373 bytes)

5. Re: [Amps] HV transformer and Variac (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 29 Jul 2015 14:15:42 -0700
The electrical resistivity of carbon brushes is highly anisotropic, due to the orientation of the graphite particles during compression. Electrical resistivity anisotropy (cross-plane/in-plane) can v
/archives//html/Amps/2015-07/msg00181.html (11,132 bytes)

6. Re: [Amps] Adjustable Regulated Screen Supply. (score: 1)
Author: "Doug Ronald" <>
Date: Tue, 8 Mar 2016 15:46:40 -0800
I have one in my garage that I'll never use. One 6146 looks gassy, but it still works, and I have a spare 6146 available. I don't have a schematic, but with point-to-point wiring, it's pretty easy to
/archives//html/Amps/2016-03/msg00011.html (8,911 bytes)

7. Re: [Amps] 3 phase HV transformers on single phase (score: 1)
Author: "Doug Ronald" <>
Date: Fri, 28 Oct 2016 11:39:23 -0700
It actually works very well. I use Collins 208U-10 plate/screen transformers which look very similar to your images, to boost my single phase 240 VAC 60 Hz up to 5200 VAC for transmission from my sol
/archives//html/Amps/2016-10/msg00130.html (9,106 bytes)

8. Re: [Amps] 3 phase HV transformers on single phase (score: 1)
Author: "Doug Ronald" <>
Date: Mon, 31 Oct 2016 12:01:36 -0700
Even more - I have 3 transformers hung on the 5200 volt bus. The 48 VDC battery has a capacity of 1760 AH, so just the transformers alone would discharge the battery in a month. Of course the 6.6 kW
/archives//html/Amps/2016-11/msg00001.html (9,319 bytes)

9. Re: [Amps] High Voltage Transformers and Components (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 30 Nov 2016 10:34:59 -0800
I'll top that! I have two Harris 3CX1500A7/8877 power supplies at only $250 each. Just the plate transformer is worth twice that. Check the specs here: -W6D
/archives//html/Amps/2016-11/msg00190.html (8,231 bytes)

10. Re: [Amps] Pulls? (score: 1)
Author: "Doug Ronald" <>
Date: Thu, 8 Dec 2016 09:30:01 -0800
and I have two 4CX10000D's with sockets, chimneys, filament xformer, and all associated hardware, darn-near for free... -W6DSR P.S. I "pulled" them from working xmitters. add to the list of Pulls her
/archives//html/Amps/2016-12/msg00193.html (12,603 bytes)

11. Re: [Amps] HARRIS PP-7913/URC POWER SUPPLY (score: 1)
Author: "Doug Ronald" <>
Date: Thu, 5 Jan 2017 14:42:24 -0800
I own two of these power supplies (which I'm trying to sell), and you could lift the point E3, the junction of the negative of the filter capacitor with the lower end of the choke, place your current
/archives//html/Amps/2017-01/msg00110.html (9,583 bytes)

12. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: "Doug Ronald" <>
Date: Wed, 22 Feb 2017 11:20:39 -0800
I have been poking around on Internet looking for a scholarly article or two on generating SSB using switching techniques for the RF generation. It appears that GaN MOSFETs are the promise for genera
/archives//html/Amps/2017-02/msg00179.html (13,354 bytes)

13. Re: [Amps] Tubes, transistors, and 'abuse' (score: 1)
Author: "Doug Ronald" <>
Date: Tue, 11 Apr 2017 13:04:15 -0700
I just tested the anti-static mat in front of me with an ohmmeter, and was amazed to see the resistance was not linear with distance. The mat was on an insulating surface, and with the probes as clos
/archives//html/Amps/2017-04/msg00077.html (15,720 bytes)

14. Re: [Amps] Price per Watt Conversation (score: 1)
Author: "Doug Ronald" <>
Date: Sun, 23 Apr 2017 11:49:39 -0700
"I don't think there is an upper limit. It's more a question of what's practical. There is an increasing number of hams using homebrew amplifiers that use 16, 24, 32, or even 48 cheap 1-dollar MOSFET
/archives//html/Amps/2017-04/msg00222.html (13,373 bytes)

15. Re: [Amps] HV MOSFETs for RF (score: 1)
Author: "Doug Ronald" <>
Date: Fri, 12 May 2017 10:39:56 -0700
A "Tandem Match" coupler is easy and fun to build. The coupling factor is based on a turns ratio with 30 to 40 dB typical. An advantage is that the reflected power is also available. If you home make
/archives//html/Amps/2017-05/msg00120.html (12,445 bytes)

16. Re: [Amps] About LP100A (score: 1)
Author: "Doug Ronald" <>
Date: Tue, 20 Jun 2017 15:01:31 -0700
My Tektronix TDS794D by menu selection, allows YT, XY, and XYZ modes, where YT is the conventional O-scope mode, XY mode allows two of the four input channels to form the Lissajous pattern useful for
/archives//html/Amps/2017-06/msg00246.html (10,888 bytes)

17. Re: [Amps] issue with AL-1200 output -UPDATE NUMBER 2- (score: 1)
Author: "Doug Ronald" <>
Date: Tue, 27 Jun 2017 10:59:59 -0700
I have three Collins CU-1169 antenna tuners where each vacuum variable has spark gaps. Of course being Collins, the gaps are adjustable silver plated spheres with current sample resistors for the ele
/archives//html/Amps/2017-06/msg00288.html (8,877 bytes)

18. Re: [Amps] LDMOSFET questions for insiders (score: 1)
Author: "Doug Ronald" <>
Date: Sat, 17 Nov 2018 14:25:13 -0800
This app note gives some information on repetitive avalanche ruggedness and unclamped inductive switching which may help... W6DSR He
/archives//html/Amps/2018-11/msg00060.html (9,514 bytes)

19. Re: [Amps] LDMOSFET questions for insiders (score: 1)
Author: "Doug Ronald" <>
Date: Tue, 20 Nov 2018 10:57:03 -0800
Ampleon has published on the topic, and is one of the few semiconductor companies who specify their avalanche energy at least for the BLF188XR LDMOS dual. They still use the UIS test which demonstrat
/archives//html/Amps/2018-11/msg00069.html (9,950 bytes)

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