- 201. [Amps] Safety choke question (score: 17)
- Author: "Jim Thomson" <jim.thom@telus.net>
- Date: Thu, 12 Jan 2012 14:38:20 -0800
- Hi Jim, I suppose you would like to put that choke across the (50Ohm) output terminal ? Think 225uH is not needed at all to have negligible effect at 160mtrs. I would go for a reasonable sized toroid
- /archives//html/Amps/2012-01/msg00136.html (8,304 bytes)
- 202. Re: [Amps] PI-L Thoughts! (score: 17)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Sat, 11 Dec 2010 23:01:21 -0500
- Although they only used a 2 section cap, Hallicrafters did this in the HT33B amp. On 75 they operated a "knife switch" with a cam on the band switch shaft. Nice job of construction. Did you use the t
- /archives//html/Amps/2010-12/msg00129.html (11,647 bytes)
- 203. Re: [Amps] L section of Pi-L filter (score: 17)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 6 Jan 2010 15:12:39 -0500
- Alpha and others have been using toroids for 4 decades in L networks at 1500-2500W with no problems. The material used is a 2 Mix powdered iron from Micrometals with the cores appearing to be a stack
- /archives//html/Amps/2010-01/msg00033.html (11,062 bytes)
- 204. Re: [Amps] L section of Pi-L filter (score: 17)
- Author: Karl-Arne Markström <sm0aom@telia.com>
- Date: Wed, 6 Jan 2010 20:16:54 +0100
- 1. Toroids have to be quite heavily dimensioned, as they are storing a lot of magnetic energy in a small space. At an L-network Q of 2 they have to store at least 2000 VAr in the toroid magnetic mate
- /archives//html/Amps/2010-01/msg00032.html (8,612 bytes)
- 205. Re: [Amps] PiL Output Network Adjustment (score: 17)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Fri, 15 Dec 2006 05:14:30 -0500
- A few comments: Toroids in theory are self -shielding. This would mean all flux is confined to the iron core magnetic path, and any short would take the reactance of all other areas of the winding to
- /archives//html/Amps/2006-12/msg00093.html (10,638 bytes)
- 206. Re: [Amps] glass tape scotch 27 (score: 17)
- Author: "Will Matney" <craxd1@verizon.net>
- Date: Fri, 16 Jun 2006 23:00:46 -0400
- George, Not a word would have ever been muttered by me if one on here hadn't bragged about being rich and retiring in their 30's to get a dig at me. To top that, they then said I was being sarcastic,
- /archives//html/Amps/2006-06/msg00311.html (15,470 bytes)
- 207. Re: [Amps] glass tape scotch 27 (score: 17)
- Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
- Date: Wed, 14 Jun 2006 12:32:03 -0400
- It's not just the temperature, but the physical endurance and the electrical properties as well. Remember that this stuff will be exposed to high RF and magnetic fields. I once had the base of an RF
- /archives//html/Amps/2006-06/msg00288.html (11,157 bytes)
- 208. Re: [Amps] glass tape scotch 27 (score: 17)
- Author: "Will Matney" <craxd1@verizon.net>
- Date: Wed, 14 Jun 2006 08:37:15 -0400
- I'm not being sarcastic, but simply asking a question. Again, what's the use in using a tape that I would think could be replaced with something much cheaper for us poor folks. Not everyone in the US
- /archives//html/Amps/2006-06/msg00283.html (11,166 bytes)
- 209. Re: [Amps] glass tape scotch 27 (score: 17)
- Author: "Will Matney" <craxd1@verizon.net>
- Date: Wed, 14 Jun 2006 08:30:34 -0400
- I'm glad you retired at 32, some of us don't have that luxury, nor can afford a high priced tape if it's not called for. I'm simply asking a question to all who are saying they use this tape. Will **
- /archives//html/Amps/2006-06/msg00282.html (11,127 bytes)
- 210. Re: [Amps] glass tape scotch 27 (score: 17)
- Author: "Will Matney" <craxd1@verizon.net>
- Date: Tue, 13 Jun 2006 14:31:22 -0400
- What I'm wondering is why one would need a tape rated at 130 C (266 F)? The core should not get no where near that hot, maybe just warm to the touch which would be around 100-110 F (37.7-43.3C). Ferr
- /archives//html/Amps/2006-06/msg00277.html (8,863 bytes)
- 211. Re: [Amps] Re: compact coils... (score: 17)
- Author: Mike Manship <mjmanship@iquest.net>
- Date: Tue, 15 Feb 2005 13:46:50 -0500
- I remember an amp project in the ARRL handbook years ago which used several pieces of ferrite rod taped together and placed inside of one end of the tank coil to provide enough inductance for 80 met
- /archives//html/Amps/2005-02/msg00531.html (7,003 bytes)
- 212. Re: [Amps] AL-1200 Pop/Arching, 756 Pro II failure (score: 17)
- Author: Dana Roode <K6NR@ARRL.net>
- Date: Sun, 12 Oct 2003 13:43:57 -0700
- Rich - - Does your AL-1200 have the "neutralization" circuit? I'm not sure, how do you tell? There is a small diameter red wire wrapped around a small toroid core feeding the +HV to the plate; there
- /archives//html/Amps/2003-10/msg00096.html (8,470 bytes)
- 213. [AMPS] continued Alpha work (score: 17)
- Author: tduffy@sygnet.com (Tim Duffy)
- Date: Sat, 02 Jun 2001 12:19:22 -0500
- I had vacuums RF relay fail in the output circuit of my 15 meter 8877 amplifier and it had the exact same symptoms as you describe. Panel meters look OK, but power output is low. Has he tried another
- /archives//html/Amps/2001-06/msg00016.html (9,141 bytes)
- 214. [AMPS] continued Alpha work (score: 17)
- Author: nospam4me@juno.com (nospam4me@juno.com)
- Date: Sat, 2 Jun 2001 09:42:10 -0700
- - Hi there, - I've relayed to Bob about checking the blocking caps and the tank alignment. He has done said with no positive results. Here is his latest text to me. I'm in the process of relaying som
- /archives//html/Amps/2001-06/msg00014.html (8,212 bytes)
- 215. [AMPS] How to build the ultimate HF amplifier ? (score: 17)
- Author: bob.sutton@xtra.co.nz (Bob Sutton)
- Date: Sat, 31 Oct 1998 10:33:32 +1300
- for each Hello John, Einar, and group, This method is used in the "Aerocom" 6 channel 1kW SSB/CW HF transmitter. The exciter drove the 4CX1500B tetrode with 3 watts in a passive grid circuit with bro
- /archives//html/Amps/1998-10/msg00506.html (8,984 bytes)
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