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1. Re: [Amps] finding a good blower in Europe? (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 22 Sep 2009 23:43:12 +0000; I would second ACI - their service is very good. Also I don't think that shaded pole motors will give the power output required to deliver the necessary quantity of air at the required back pressure; /archives//html/Amps/2009-09/msg00263.html (7,951 bytes)
2. Re: [Amps] Harris amps (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 19 Feb 2009 20:41:00 +0000; I have an RF-104 which I use as the main station amplifier. The RF deck is the same as the RF-103 with a single gg 3-1000Z. As standard they don't cover 160m although the 2 to 2.5MHz band position w; /archives//html/Amps/2009-02/msg00575.html (8,862 bytes)
3. Re: [Amps] HV wire (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 23 Dec 2008 05:55:45 +0000; There is a tendency for the foam to compress reducing the effective depth of insulation particularly on bends or in the extreme for the centre conductor to work through the foam insulation. Regards; /archives//html/Amps/2008-12/msg00296.html (8,030 bytes)
4. Re: [Amps] Meter Face Making (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 4 Dec 2008 19:24:24 +0000; When I made some meter scales a few years back, I simply scanned the old meter scale using a flatbed scanner, and modified the calibration lettering using Photoshop, but any image editing software s; /archives//html/Amps/2008-12/msg00091.html (8,424 bytes)
5. Re: [Amps] Tetrode amplifiers at LHC (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 16 Sep 2008 11:31:08 +0000; I noticed the klystons - 48 x 100kw units to produce 4.8MW at 400MHz. I also noticed the cooling arrangements for the ring - liquid helium to maintain the 1.7 Kelvin temperature. If you click on the; /archives//html/Amps/2008-09/msg00153.html (9,086 bytes)
6. [Amps] Who said tubes were dead ........ (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 12 Sep 2008 12:20:20 +0000; It's still reasuring that the new LHC at CERN uses Tetrodes. See https://edms.cern.ch/file/445768/3/Vol3_Chap6_v3.pdf If you want to build your own LHC the full design report is publically available; /archives//html/Amps/2008-09/msg00116.html (7,105 bytes)
7. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 15:58:06 +0000; See www.burle.com/cgi-bin/byteserver.pl/pdf/tp105.pdf Regards David G4FTC _________________________________________________________________ Get all your favourite content with the slick new MSN Tool; /archives//html/Amps/2008-09/msg00084.html (8,396 bytes)
8. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 11:37:16 +0000; But nothing should burn out or need replacing. All you should need to do is press the reset button and the transmitter brings itself back into service. Often this would be fully automatic for operat; /archives//html/Amps/2008-09/msg00070.html (9,809 bytes)
9. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 05:09:26 +0000; I tried that with a 2x 4CX250B 2 metre amp - when the fuse blows an arc forms causing the glass to shatter. To compound matters the fuse wire evaporates and deposits itself on the inside of the glas; /archives//html/Amps/2008-09/msg00065.html (9,388 bytes)
10. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 8 Sep 2008 19:16:45 +0000; True - but the arc will continue until the applied voltage has dropped to quite a low voltage, which without a crowbar, means that the resistor will in effect dissipate the energy in the capacitor b; /archives//html/Amps/2008-09/msg00050.html (9,382 bytes)
11. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 8 Sep 2008 16:18:44 +0000; Checking page 4 of the datasheet for the RCH50 http://www.vishay.com/docs/50006/rch.pdf shows a maximum overload capability of about 50 Joules. A capacitor bank for a linear of 50uF charged to 3kV w; /archives//html/Amps/2008-09/msg00045.html (8,610 bytes)
12. Re: [Amps] tube output power (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 25 Jul 2008 18:17:32 +0000; transmitters. The 'standard' tube used for 3 - 5 kW FMs that used tetrodes was the 4CX5000A, in RCA and other makes of power amplifiers. George Badger of Eimac showed us their new shortened 4CX3500A; /archives//html/Amps/2008-07/msg00262.html (8,668 bytes)
13. Re: [Amps] RF Communications RF101 power amplifier (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 10 Jul 2008 18:50:46 +0000; There's a schematic for a RF-103 on the Boatanchors Archive. http://bama.sbc.edu/harris.htm There may be some common elements circuits used between that and your RF-101 such as the power supply and; /archives//html/Amps/2008-07/msg00099.html (7,615 bytes)
14. Re: [Amps] **TROJAN ALERT** More pictures of solid state amp project posted (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Wed, 2 Jul 2008 05:04:32 +0000; Snipped When I click on the above link my Norton Anti-Virus reports that the site is trying to load "Downloader" - a Trojan - onto my PC David G4FTC _________________________________________________; /archives//html/Amps/2008-07/msg00012.html (8,325 bytes)
15. Re: [Amps] More on using a PIC processor inside HF amp (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 7 Feb 2008 19:18:38 +0000; There's another factor to be considered. Sometime ago I was considering using a PIC as an amplifier controller, and certainly there are certain advantages to that approach for sequencing, step-start; /archives//html/Amps/2008-02/msg00040.html (8,084 bytes)
16. Re: [Amps] Conductive Grease (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 27 Nov 2007 20:58:38 +0000; Castrol R. In the late '70s I was told that it still could hold its own over mineral oils and this held true until the advent of synthetic oils Castrol still do make a Castor Oil based lubricant - C; /archives//html/Amps/2007-11/msg00384.html (8,294 bytes)
17. Re: [Amps] Harris RF-104 was Amps Digest, Vol 59, Issue 56 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 27 Nov 2007 19:21:07 +0000; Robby, The RF-104 is not normally set for "ground keying line to tranmit" operation. However all that's needed is a 1N914 or similar diode inserted in the Program and Junction Board behind the front; /archives//html/Amps/2007-11/msg00383.html (10,117 bytes)
18. Re: [Amps] Amps Digest, Vol 59, Issue 47 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 27 Nov 2007 06:12:38 +0000; Robby, I have an RF-104 - works fine on all HF bands but only covers the top part of 160m in its standard state, but can be modified for complete 160m coverage by the addition of some Cs. Bet you had; /archives//html/Amps/2007-11/msg00381.html (8,796 bytes)
19. Re: [Amps] operating a transformer in oil (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Sun, 11 Nov 2007 07:50:02 +0000; you are running the transformer from the correct supply voltage, the flux density will be OK. higher load current - this will result in increased temperatures and it is this which can ruin the trans; /archives//html/Amps/2007-11/msg00139.html (8,521 bytes)
20. Re: [Amps] operating a transformer in oil (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Sat, 10 Nov 2007 17:49:51 +0000; The flux density is set by the excitation voltage and not load current - if you are running the transformer from the correct supply voltage, the flux density will be OK. What you will get is increas; /archives//html/Amps/2007-11/msg00135.html (7,607 bytes)

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