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1. [AMPS] Re:Kilovac relays (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Thu, 27 Sep 2001 11:53:40 -0400; Relay manufactures design the contacts of their relays for specific applications. Relays generally carry an application rating such as 'Make & Break Load Switching', 'No Load Switching', 'Make Only L; /archives//html/Amps/2001-09/msg00444.html (8,305 bytes)
2. [AMPS] Amp Parts for Sale (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Sat, 10 Feb 2001 16:21:29 -0500; Send email request for list. 73, Dave, K1FK Fort Kent, ME -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Probl; /archives//html/Amps/2001-02/msg00223.html (6,363 bytes)
3. [AMPS] SB 220 conversion for 160 - Vacuum Relays (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Thu, 7 Dec 2000 14:10:48 -0500; Here's another source of vacuum relays which are removed from NEW equipment, tested, hipotted, and fully guaranteed. The price is VERY competative. http://www.mgs4u.com/relay.htm 73, Dave, K1FK Fort; /archives//html/Amps/2000-12/msg00116.html (6,766 bytes)
4. [AMPS] Alpha 374 cathode circuit (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Sun, 17 Dec 2000 06:55:20 -0500; Old Eimac data I have gives the cathode-driven input impedance as 95 Ohms for a single tube. 73, Dave, K1FK Fort Kent, ME -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contestin; /archives//html/Amps/2000-12/msg00258.html (6,817 bytes)
5. [AMPS] Directional coupler design (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Thu, 30 Nov 2000 13:09:25 -0500; Go to your local public or university library and ask them to obtain a copy (on inter-library loan) of "RF Design Guide, Systems, Circuits, and Equations" by Peter Vizmuller, Artech House 1995, ISBN; /archives//html/Amps/2000-11/msg00460.html (7,602 bytes)
6. [AMPS] RE: Graphite Anodes (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Sun, 24 Sep 2000 11:08:34 -0400; Graphite anode material is generally used in high-vacuum tubes to provide [continuous] "getter" action which aids in maintaining the high-vacuum state in larger high-vacuum envelopes. "Getter" action; /archives//html/Amps/2000-09/msg00967.html (7,469 bytes)
7. [AMPS] Relays hanging up (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Sun, 13 Aug 2000 08:16:48 -0400; The solenoid in a vacuum relay is simply an electromagnet. There are several factors which can cause undesirable dynamic characteristics of any electromagnet, notably (1) heating of the solenoid, (2); /archives//html/Amps/2000-08/msg00265.html (11,299 bytes)
8. [AMPS] RE: Litz Wire (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Mon, 26 Jun 2000 07:32:52 -0400; Litz wire (Litzendraht) is (not) created by simply twisting insulated conductor strands together as described in the original posting. The insulated strands must be braided, i.e., transposed a manner; /archives//html/Amps/2000-06/msg00407.html (7,914 bytes)
9. [AMPS] parts (James Millen) (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Tue, 4 Jan 2000 19:39:22 -0500; James Millen Div. of Beta Labs, Inc. 290 Main St. Suite #4 Stoneham, MA 02180 PHONE:(781)438-5300 FAX:(781)438-1662 http://www.jamesmillen.com Cardwell Condenser Corp. http://www.cardwellcondenser.co; /archives//html/Amps/2000-01/msg00105.html (7,289 bytes)
10. [AMPS] FS: Transmitter Rack (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Wed, 5 Jan 2000 11:30:59 -0500; Transmitter rack enclosure, 66" overall, 61" x 19" panel space, 24" deep, with rear locking door and mounting rails, black texture finish. Custom made to my specs. Can be shipped UPS Ground. Details; /archives//html/Amps/2000-01/msg00123.html (6,769 bytes)
11. [AMPS] RE: AMPS] Class C SSB amplifier (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Mon, 10 Jan 2000 15:30:38 -0500; Dave, Mathematically, it is impossible to implement the necessary filters at RF [and have them track frequency-wise for ham-band use (assumed to be under microprocessor/computer control)], to impleme; /archives//html/Amps/2000-01/msg00229.html (7,682 bytes)
12. [AMPS] FS: Amp Parts (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Fri, 14 Jan 2000 08:59:52 -0500; I have a few small parts remaining from my previous posting of 16 Dec 99, including meters, turns counter dials, blowers, tubes, sockets, chimneys, etc. Send email request for list to: dbowker@mail.s; /archives//html/Amps/2000-01/msg00278.html (6,647 bytes)
13. [AMPS] Alert-- ptfe does NOT give phosgene (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Sat, 15 Jan 2000 23:52:47 -0500; Teflon is a (fluorocarbon resin) or (flourine plastic) and has the same structure as polyethylene, in which the hydrogen is replaced by (flourine). OR a part may be replaced by (chlorine), in which c; /archives//html/Amps/2000-01/msg00349.html (9,131 bytes)
14. [AMPS] Silver Solder - Some General Information (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Thu, 27 Jan 2000 18:50:27 -0500; I posted this to the Tower Talk reflector earlier in response to a thread there. Since many amp. builders use the silver soldering process in construction, especially at VHF/UHF, I thought it would b; /archives//html/Amps/2000-01/msg00550.html (10,265 bytes)
15. [AMPS] FS: Amp Parts (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Thu, 16 Dec 1999 13:11:07 -0500; Send email request for list of amp. parts and misc. to dbowker@mail.sjv.net. 73, Dave, K1FK Fort Kent, ME -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Admini; /archives//html/Amps/1999-12/msg00192.html (6,554 bytes)
16. [AMPS] FS: Model 86 Bandswitch (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Tue, 16 Nov 1999 11:14:37 -0500; Model 86 bandswitch, 2-pole 6-position, 2-deck, 60-degree indexing, 20-Amp/6 kV silver contacts. $75 includes shipping via USPS Priority Mail in CONUS. Digital photos available via email to serious i; /archives//html/Amps/1999-11/msg00342.html (6,708 bytes)
17. [AMPS] RF Surge Problem (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Tue, 26 Oct 1999 18:48:12 -0400; Jim, Likely causes of failure of one of these devices, if not by lightning, is high SWR on the xmtr line to the linear or antenna tuner or very high precipitation static buildup on an antenna such as; /archives//html/Amps/1999-10/msg00653.html (8,595 bytes)
18. [AMPS] Sticking Vacuum Relays - Some Causes (score: 1): Author: dbowker@mail.sjv.net (Dave Bowker); Date: Tue, 6 Jul 1999 04:49:23 -0400; The solenoid in a vacuum relay is simply an electromagnet. There are several factors which can cause undersirable dynamic characteristics of any electromagnet, notably (1) heating of the solenoid, (2; /archives//html/Amps/1999-07/msg00085.html (8,927 bytes)
19. [Amps] Vacuum Variable Fatigue Failures (score: 1): Author: "Dave Bowker" <dbowker@mail.sjv.net>; Date: Sat, 16 Feb 2008 15:29:44 -0500; The mechanical life expectancy of any vacuum variable capacitor (independent of manufacturer) is dependent upon (1) length of stroke of the bellows, (2) speed of operation or mechanical cycling of th; /archives//html/Amps/2008-02/msg00119.html (7,240 bytes)

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