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1. [Amps] Output Safety Choke Value (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 15 Nov 2002 14:29:44 +0000; Hi Greg & Amps group In my 4CX1000A amplifier the output choke and anode choke are identical. They are both 63uH, 100turns on 23mm fibre glass tube, and have a first series resonance comfortably abov; /archives//html/Amps/2002-11/msg00248.html (8,712 bytes)
2. [Amps] New content on Granta CG Website (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 25 Nov 2002 10:16:02 +0000; Hi There are now contest logs and photos on our website. There are also homebrew construction articles on, - HF Transceiver - 4CX1000A Linear Amplifier - SWR Power meter - 15m 3-element yagi - Voice; /archives//html/Amps/2002-11/msg00362.html (7,795 bytes)
3. [Amps] Copper Pi tank coil oxidisation (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Wed, 08 May 2002 15:45:45 +0100; Hi I'm in the commissioning and measurement stages of my homebrew 4CX1000A amp project (1600W out now and looking good). A couple of weeks have passed by since I wound the Pi tank coils using 5mm Cu; /archives//html/Amps/2002-05/msg00086.html (7,506 bytes)
4. [AMPS] Coil Forms (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 12 Nov 2001 14:08:41 +0000; Hi guys What are the plastic ribs on B&W coil stock made of? (I'm looking for different mounting methods for ATU coils and a 4CX1000A linear Pi-Tank.) Also what's the best (readily available) materia; /archives//html/Amps/2001-11/msg00188.html (9,809 bytes)
5. [AMPS] Bandswitch parts? (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Tue, 13 Nov 2001 08:53:26 +0000; The BC375 switch is fine for 1kW, thanks to Peter it's in my linear, see also http://www.lukesoft.2y.net/granta/linear/bandsw~1.jpg 73, Mark G4AXX ** Fair Radio Sales, Lim, OH http://www.fairradio.co; /archives//html/Amps/2001-11/msg00220.html (10,636 bytes)
6. [AMPS] 4CX1000A Linear schematics (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Thu, 13 Sep 2001 15:47:05 +0100; Hi all I've now put the schematics of my 4CX1000A linear amp project on www.granta.cjb.net Click on "Equipment", then the 4CX1000A icon. The schematics are down-loadable as PDF documents Clicking on; /archives//html/Amps/2001-09/msg00228.html (6,614 bytes)
7. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 05 Jan 2001 16:17:34 +0000; Hi Mike, The Eimac website has a section with this title on http://www.eimac.com/cfcontnt.htm 73 Mark G4AXX -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administ; /archives//html/Amps/2001-01/msg00166.html (9,919 bytes)
8. [AMPS] start (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 23 Oct 2000 16:15:53 +0100; Tom, How long would you recommend the filament voltage of a 4CX1000A be on for, before applying the other rails? 73, Mark G4AXX -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@co; /archives//html/Amps/2000-10/msg00517.html (9,169 bytes)
9. [AMPS] Adapter for dummy load needed (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 29 Sep 2000 15:53:03 +0100; Hi Carsten I think EIA is 3.125", your dummy load connector is a bit smaller. try http://www.spinner.de/ Mark G4AXX -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com; /archives//html/Amps/2000-09/msg01178.html (8,403 bytes)
10. [AMPS] amps (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Wed, 09 Aug 2000 10:45:04 +0100; This is my 4th attempt to warn people about the vi... that came through the reflector. If you want to know what it was and how to get disinfected email me direct. The reflector seems to be filtering; /archives//html/Amps/2000-08/msg00175.html (6,860 bytes)
11. [AMPS] Coil heating (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 26 Jun 2000 10:23:34 +0100; try a getting parallel the should easily, but feel * RF current flows on the outer surface of the 6mm tube but can't flow on the surfaces of the 1mm wires on the inside of the twisted bundle. In fac; /archives//html/Amps/2000-06/msg00402.html (10,599 bytes)
12. [AMPS] Coil heating (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 26 Jun 2000 11:32:54 +0100; "Why Use Litz Wire? Litz construction is designed to minimize the power losses exhibited in solid conductors due to "skin effect". Skin Effect is the tendency of radio frequency current to be concen; /archives//html/Amps/2000-06/msg00404.html (11,868 bytes)
13. [AMPS] chip capacitor source? (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Wed, 24 May 2000 17:42:06 +0100; Hi Fraser try Direct Buy Microwave PO Box 155, Fareham, Hants, PO15 5XA tel 01329 313313 (fax ..312131) Ask for Accu-P cap series, or check the Arrow catalogue, caps are about 67p each lab kits are o; /archives//html/Amps/2000-05/msg00275.html (10,133 bytes)
14. [AMPS] Copper tube - semi-rigid (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 28 Apr 2000 17:11:57 +0100; Can anyone please help me find copper tube for a pi-tank coil for a 160 thru 10m 4CX1000A amp? 8mm O.D. is easily obtained but I need 4 or 5mm OD, and a continuous piece about 5m (16ft) long. Alterna; /archives//html/Amps/2000-04/msg00179.html (9,027 bytes)
15. [AMPS] filament rheostats (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 21 Feb 2000 16:23:45 +0000; butts means capability output'. current, thing Heaters are soft-started with a motor-diriven variac, or get a step-start supply, but has anybody seen or tried slow starting a heater using a triac an; /archives//html/Amps/2000-02/msg00419.html (10,368 bytes)
16. [AMPS] Jackson Bros ceased trading (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 16 Apr 1999 15:18:21 +0100; I've just been trying to order some Jackson Bros hardware. The hardware I was enquiring about was 6:1 epicyclic ball reduction drive, shaft bushes, and 0.25" shaft extenders. The parts are for the fr; /archives//html/Amps/1999-04/msg00302.html (8,249 bytes)
17. [AMPS] Coax relay (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 23 Apr 1999 15:48:28 +0100; I have a CX-520-D coax relay. Its' specification as given on http://www.ers.fr/GRELAY.HTM is; Max input power : 300 W / 1 GHz Insertion Loss : < 0,2 dB / 1,5 GHz Crosstalk : >50 dB / 1 GHz SWR : 1:1,; /archives//html/Amps/1999-04/msg00381.html (8,204 bytes)
18. [AMPS] Band switch (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Fri, 19 Mar 1999 14:47:35 +0000; I am looking for a suitable band switch for a pi-network output for a homebrew 4CX1000A 6 band amplifier. (160 to 10m) PA is 2.7kV at 1A, Qo is 12.5, so at least 13A, 3kVdc contacts are required I'm; /archives//html/Amps/1999-03/msg00483.html (7,621 bytes)
19. [AMPS] Solid state relays and HV fusing (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Tue, 23 Mar 1999 10:09:09 +0000; A disadavantage of SSRs in primary supply / soft-start switches of a HV transformer is that Triacs continue to conduct (in a flashover fault situation) until the next mains zero-crossing. It could ta; /archives//html/Amps/1999-03/msg00576.html (8,932 bytes)
20. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Mark Marsden" <MM@plextek.co.uk>; Date: Wed, 23 Mar 2005 10:01:23 +0000; Hi Randall Have a look at http://granta.digital-crocus.com/Linear_Design_notes/Spectral_regrowth.jpg That's a screenshot of the transmit spectrum of my 4CX1000A linear, (Va 2750V, Vs 350V, ZSAC 250mA; /archives//html/Amps/2005-03/msg00515.html (9,668 bytes)

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