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21. Re: [Amps] which cathode choke? (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Tue, 23 Dec 2008 11:13:08 -0700; This is 29 turns each of 10 awg enameled wire bifilar over a 0.5" x 7.5" rod. It is in a well-worn box labeled "B&W FC-25A" but I have no idea if it is the th actual B&W product. Steve KK7UV ________; /archives//html/Amps/2008-12/msg00308.html (12,331 bytes)
22. [Amps] doorknob caps (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Wed, 24 Dec 2008 06:35:29 -0700; I have some Centralab/ITT Jennings 858/HH58 doorknob caps 1000pF 5kV. Are these appropriate for use as plate coupling and plate bypass caps in a 1500 watt input amp, 2700v plate voltage, 2500 plate Z; /archives//html/Amps/2008-12/msg00313.html (6,575 bytes)
23. [Amps] switchable zener cathode bias (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Tue, 30 Dec 2008 09:53:14 -0700; Considering the common zener bias circuit (with the 2n3055 and resistor), what precautions should be taken if I wanted two different zeners (and associated bias voltages) selected by a switch or rela; /archives//html/Amps/2008-12/msg00377.html (7,353 bytes)
24. [Amps] turns counter needed (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Fri, 2 Jan 2009 12:17:41 -0700; I am looking for another turns counter to match the one I have. I do not know who manufactures it, but it is seen in Orr's Radio Handbook, 23rd edition. Ch. 17. figures 13 and 30. Thanks, Steve KK7UV; /archives//html/Amps/2009-01/msg00015.html (6,965 bytes)
25. [Amps] plate bypass caps (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 11 Jan 2009 18:38:04 -0700; I have an Ameritron plate choke mounted in my amp project. It is 225uH. With 2700 plate volts, this is 2544 ohms at 1.8 MHz and thus 1.06 amps. I am now assuming the plate bypass capacitor at the bas; /archives//html/Amps/2009-01/msg00093.html (7,555 bytes)
26. Re: [Amps] plate bypass caps (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 18 Jan 2009 17:12:44 -0700; I have quite a few of the old-style transmitting mica caps (C-D, Sangamo, Solar, etc.). Are these okay to use in a nearly-legal-limit amp for either plate-choke bypassing, or antenna load padders? So; /archives//html/Amps/2009-01/msg00154.html (9,027 bytes)
27. Re: [Amps] plate bypass caps (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 19 Jan 2009 06:11:53 -0700; I did not give enough info. My loading cap is a 2100 pF variable. In case I need to pad that for tuning 160m, I was thinking of a 500pF padder that I can switch in. Running through PI-EL again, it lo; /archives//html/Amps/2009-01/msg00161.html (9,181 bytes)
28. [Amps] Hi-G d'Italia relays (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Tue, 20 Jan 2009 04:17:09 -0700; N4ZR wrote... I bought a couple of these to try out. I was preparing one for mounting in the amp and found the attached coax was a little too short so needs to be replaced. I've attempted to disconne; /archives//html/Amps/2009-01/msg00183.html (7,486 bytes)
29. [Amps] amp relay interconnection (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Wed, 21 Jan 2009 09:59:46 -0700; When inter-connecting input and output relay RF contacts, what conditions warrant using coax versus wire? My layout will be fairly compact with no more than 3 inches of conductor needed between any o; /archives//html/Amps/2009-01/msg00203.html (7,368 bytes)
30. Re: [Amps] amp relay interconnection (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Wed, 21 Jan 2009 10:09:32 -0700; I always forget to mention something important. This is a 160m-20m amp. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2009-01/msg00206.html (7,052 bytes)
31. [Amps] Pi coil tapping (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 25 Jan 2009 08:42:45 -0700; What set-up precautions are necessary to run through a coil-tapping process? Here is what I've done so far... With my tune and load capacitors mounted in their final positions in the RF compartment,; /archives//html/Amps/2009-01/msg00290.html (8,089 bytes)
32. Re: [Amps] pole transformer (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 02 Feb 2009 11:49:03 -0700; Wasn't the PCB-cancer risk debunked 10 years ago in the Kimbrough study (?). What data??? What hazards??? If I remember correctly, there never was a causal link between PCB exposure and human cancer.; /archives//html/Amps/2009-02/msg00033.html (7,891 bytes)
33. [Amps] bypassing control leads (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Tue, 3 Feb 2009 05:43:42 -0700; My homebrew amp has 3 compartments - the RF compartment, an under-chassis compartment for the input and control circuitry, and a front subpanel area for metering and control knobs and switches. What; /archives//html/Amps/2009-02/msg00050.html (7,435 bytes)
34. [Amps] pc board material (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 16 Feb 2009 07:47:12 -0700; I had some light-green, undrilled, unclad, fiberglass board material that was great for simple point-to-point circuits. My supply is exhausted. Does anyone know a source for this material? Websearchi; /archives//html/Amps/2009-02/msg00494.html (6,660 bytes)
35. Re: [Amps] pc board material (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 16 Feb 2009 10:48:29 -0700; Thanks to several of you for the identification. G-10, FR4, Garolite. That sure made it easy to find online. 73,Steve KK7UV _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2009-02/msg00508.html (7,967 bytes)
36. Re: [Amps] MFJ Analyzer for adjusting matching network... (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sat, 21 Feb 2009 05:46:14 -0700; I was told to also disconnect the plate choke and the ouput safety choke when doing this measurement. Steve KK7UV _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2009-02/msg00608.html (9,756 bytes)
37. [Amps] caps across rectifier diodes (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 1 Mar 2009 09:52:52 -0700; I am using a string of 4 6A10 diodes in each leg of my HV power supply. Should these each have a .01uF 1kv cap across them? I see some designs that do this and some do not. Tnx, Steve KK7UV _________; /archives//html/Amps/2009-03/msg00014.html (6,692 bytes)
38. [Amps] 813 cathode zener bias (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 25 May 2009 05:09:43 -0600; I am considering building the adjustable zener bias circuit as used in the GM3SEK triode board to try in my 3x813 grounded grid amp project. The GM3SEK documentation says the cicuit is good for 3 to; /archives//html/Amps/2009-05/msg00186.html (6,908 bytes)
39. [Amps] using a scope to time relays (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 25 May 2009 11:10:08 -0600; I'm attempting to set my input and output relay sequencing using a scope. I am using a 9v battery source to provide the indication of contact closure. How do you get the scope to show the actual sudd; /archives//html/Amps/2009-05/msg00187.html (7,458 bytes)
40. Re: [Amps] using a scope to time relays (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Mon, 25 May 2009 12:25:08 -0600; Thanks Mike. That is exactly the relay timing circuit I am using. Now I just need to check the timing and adjust as needed. His method for measuring the time delay appearts to use a little circuit t; /archives//html/Amps/2009-05/msg00190.html (7,509 bytes)

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