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Total 93 documents matching your query.

41. [AMPS] PS diode equalizing (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Sat, 3 Jul 1999 12:53:21 -0400
Hi Vic, from 1996 ARRL Handbook, DIODES IN SERIES, page 11.9: "There used to be a general recommendation to place a resistor across each diode in the string to equalize PIV drops. With modern diodes,
/archives//html/Amps/1999-07/msg00021.html (9,535 bytes)

42. [AMPS] PS diode equalizing (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Sat, 3 Jul 1999 21:36:12 -0400
Yep, overkill - but 32 of 'em fit on a beautiful board I had available. Plus there's room for 32 more as the project grows!. --Original Message-- From: Rich Measures <measures@vc.net> To: Bill Colema
/archives//html/Amps/1999-07/msg00027.html (9,369 bytes)

43. [AMPS] Project update & THANKS (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Sat, 3 Jul 1999 23:06:52 -0400
A week or so ago I put out a "Help Me" regarding getting my 2x4-1000 amp neutralized. Thanks to all for your input. I ended up increasing the CN bypass cap and all is well. Over the last couple of da
/archives//html/Amps/1999-07/msg00028.html (8,476 bytes)

44. FW: Re: [AMPS] PS diode equalizing (score: 1)
Author: n2bc@stny.rr.com (n2bc@stny.rr.com)
Date: Tue, 6 Jul 1999 09:45:53 -0800
OK, below Steve points out that his testing showed leakage starting at 3X the diode PIV rating... My question - does the need to equalize diminish as you reduce the PIV on the diode string? If so, th
/archives//html/Amps/1999-07/msg00108.html (9,904 bytes)

45. [AMPS] Neutralizing HB amp (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Wed, 23 Jun 1999 22:26:07 -0400
Working on a homebrew 4-1000 amp. The CN is a piston type (outer sleeve feeds below chassis to the grid circuit, inner / adjustable sleeve connected to the anodes). Due to space considerations, CN is
/archives//html/Amps/1999-06/msg00618.html (7,987 bytes)

46. [AMPS] PS question (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Mon, 3 May 1999 21:05:14 -0400
I have a resonated choke in my 4KV supply (CT FW configuration). The choke has decided that it's limit is about 2KV according to the measurements I've made. The simple cure for this is to place it in
/archives//html/Amps/1999-05/msg00019.html (7,167 bytes)

47. [AMPS] PS question (score: 1)
Author: n2bc@stny.rr.com (Bill Coleman)
Date: Tue, 4 May 1999 16:22:22 -0400
Rich asks about my 'testing' method for the PS choke.... he he he One of these day's I'll cook together a hi-pot tester, but this little problem was determined using the 'modified smoke' test approac
/archives//html/Amps/1999-05/msg00047.html (9,664 bytes)

48. Re: [Amps] VOX Tripping and Bandswitch Damage (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Fri, 24 Oct 2003 09:39:07 -0400
Hi Mike, you may be on to something... I am not familiar with the '78, but will relate something I have personally done & seen done by other folks. Our club has an SB-220. The stock Tune, Load, and B
/archives//html/Amps/2003-10/msg00228.html (9,856 bytes)

49. Re: [Amps] Water cooling heat exchanger approaches (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Tue, 28 Oct 2003 09:48:59 -0500
Just do a web search on "transmission cooler", I got 108,000 hits ! The first one I looked at was $59 but that was for an entire kit (including mounting brackets and hoses). I'm sure just the core co
/archives//html/Amps/2003-10/msg00276.html (11,027 bytes)

50. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Sat, 22 Nov 2003 12:27:25 -0500
Some interesting reading on the AC to DC to AC technology can be found here. http://www.siemens.com/page/1,3771,261226-1-12_2_261226-0,00.html In keeping with the theme of the reflector... this is pr
/archives//html/Amps/2003-11/msg00322.html (10,248 bytes)

51. [Amps] FS: Homebrew amp, pair 4-1000A's (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Tue, 2 Dec 2003 14:31:36 -0500
For Sale: Class AB1 / C homebrew amplifier with a pair of 4-1000A's. Details and pictures here: http://home.stny.rr.com/n2bc/For_Sale.htm 73, Bill N2BC _______________________________________________
/archives//html/Amps/2003-12/msg00026.html (6,808 bytes)

52. [Amps] Homebrew amp, pair 4-1000A's (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Tue, 2 Dec 2003 16:52:37 -0500
Whoops, I reused a file name. A number of people are not getting the proper page (the one they get comes from their browser cache). Here's a new URL: http://home.stny.rr.com/n2bc/for_sale_amp.htm For
/archives//html/Amps/2003-12/msg00027.html (7,214 bytes)

53. Re: [Amps] 220V service for amplifier (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Wed, 3 Dec 2003 08:23:37 -0500
NEVER 'consider' or tie neutral to ground. They are NOT the same.... Neutral carries current by design, the ground should never carry current unless there is a fault. Neutral), but I'm pretty sure gr
/archives//html/Amps/2003-12/msg00032.html (10,188 bytes)

54. Re: [Amps] RE 220 V (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Sat, 6 Dec 2003 12:09:30 -0500
NOT TRUE. There may be older vintages of the SB-220. But I looked at an undated SB-220 schematic and an SB-221 schematic dated 1976. Both of these clearly show GROUND to the chassis - the wire is lab
/archives//html/Amps/2003-12/msg00085.html (8,727 bytes)

55. Re: [Amps] RE 220 V (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Sat, 6 Dec 2003 18:51:19 -0500
Sorry Rich, you are not correct. The voltage is irrelevant. Neutral carries current, ground never carries current unless there is a fault. The diagram of the SB220/221 plug that I have clearly shows
/archives//html/Amps/2003-12/msg00086.html (10,196 bytes)

56. Re: [Amps] RE 220 V (score: 1)
Author: "Bill Coleman" <n2bc@stny.rr.com>
Date: Sun, 7 Dec 2003 09:30:29 -0500
OK Rich, The green I was referring to was the green labeled wire on the schematic for the SB-220. This wire is connected to the ground terminal of the plug in the schematic. You are saying that your
/archives//html/Amps/2003-12/msg00101.html (15,133 bytes)

57. [Amps] RCA 8122's (score: 1)
Author: "Bill N2BC" <n2bc@stny.rr.com>
Date: Mon, 3 May 2004 21:02:23 -0400
Spotted some new RCA 8122's here: http://american-milspec.com/ Use the site's search box and search on 8122 $30 each. Perfect for that tired NCL-2000, for for my Harris RF-110A. No financial interest
/archives//html/Amps/2004-05/msg00040.html (6,669 bytes)

58. [Amps] Plate choke query (score: 1)
Author: "Bill Coleman N2BC" <n2bc@stny.rr.com>
Date: Fri, 11 Jun 2004 18:42:09 -0400
I have a rather large plate choke from a 1KW broadcast transmitter. It's 1800uH. Any reason this cannot be used in a 160M thru 10M amp assuming no relevant self-resonant freqs? I'm a few weeks away f
/archives//html/Amps/2004-06/msg00065.html (6,806 bytes)

59. [Amps] 40400A Datasheet needed (score: 1)
Author: "Bill Coleman N2BC" <n2bc@stny.rr.com>
Date: Sun, 8 Aug 2004 06:12:22 -0400
Anybody have the datasheet for the 4-400A they could email me? Only need the Constant Current Characteristics graph. THX & 73, Bill N2BC email: n2bc@stny.rr.com ______________________________________
/archives//html/Amps/2004-08/msg00069.html (6,688 bytes)

60. Re: [Amps] ARRL Amplifier book (score: 1)
Author: "Bill Coleman N2BC" <n2bc@stny.rr.com>
Date: Sun, 5 Sep 2004 18:22:48 -0400
Pete, the Harris RF-110A / RF-124 meets most of those requirements. With careful shopping, one could have 3 or 4 (or more) Harris setups for the price of one new Alpha 87. It covers 2 to 30mHz in 19
/archives//html/Amps/2004-09/msg00085.html (9,848 bytes)

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