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61. [AMPS] measuring meter shunt resistance (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 17 Jun 1999 22:05:07 -0700; There is a simple way to avoid this problem which I have used many times through the years. If you need a value near 0.3 ohms for proper calibration, use a standard larger value resistor such as 1 or; /archives//html/Amps/1999-06/msg00511.html (9,355 bytes)
62. [AMPS] National Amplifier NCL 2000 (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 29 Jun 1999 22:51:13 -0700; I believe that Carl, KM1H, has a selection of parts from the NCL 2000. He was involved in the design of that amp and, I believe, bought many parts from National when they ceased manufacture of the am; /archives//html/Amps/1999-06/msg00787.html (7,913 bytes)
63. [AMPS] Solid State Amp Problem (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 20 May 1999 07:39:28 -0700; Paul: Have you considered possibility of r.f. getting into p.s. or maybe even on the case of the radio. Do you have a balun on the antenna? I would look into the possibility of r.f. on the outside of; /archives//html/Amps/1999-05/msg00242.html (9,698 bytes)
64. [AMPS] 3-500Z question (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 28 May 1999 14:37:21 -0700; Greg: I also have one of the same tubes labeled in the same way. It was given to me by my neighbor who is a Varian sales rep. When they closed the dallas office down there were several tubes there an; /archives//html/Amps/1999-05/msg00331.html (8,294 bytes)
65. [AMPS] INFORMATION (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 21 Apr 1999 11:03:30 -0700; --6ADA46BC079D19E78CABB86A Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sergio: the part you mention is a time delay relay. It turns on the high voltage to your amp afte; /archives//html/Amps/1999-04/msg00371.html (9,464 bytes)
66. [AMPS] INFORMATION (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 21 Apr 1999 17:50:46 -0700; --342964E0C1313BA09529A5C6 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I searched the internet for amperite and found that Allied Electronics sells Amperite time delay; /archives//html/Amps/1999-04/msg00377.html (9,775 bytes)
67. [AMPS] BTI LK 2000 (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 08 Feb 1999 16:09:45 -0800; I owned and used a BTI 2000HD for about 5 years. I loved it. It had better efficiency than most linears I have used. The layout is not crowded. The pi-L output and tuned input contribute to the effic; /archives//html/Amps/1999-02/msg00253.html (8,041 bytes)
68. [AMPS] Eimac 4CX600J comments? (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 08 Feb 1999 16:26:23 -0800; There are quite a few of these tubes surplus in the Dallas flea markets. They were used in an airborne linear built by Rockwell (Collins). I have seen one and it is unbelievably compact . I believe t; /archives//html/Amps/1999-02/msg00255.html (9,068 bytes)
69. [AMPS] Cure for "Monitor Ripple" from Amp's PS ? (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 15 Feb 1999 07:22:59 -0800; Sounds like the magnetic field from your amps plate xfmr is deflecting the electron beam in your crt. A sheet of soft iron between the two may help. A better material would be mu metal or some simila; /archives//html/Amps/1999-02/msg00401.html (9,516 bytes)
70. [AMPS] 6146 high imd/receivers (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 20 Feb 1999 18:42:13 -0800; Igor: you say some scanners have +30 dbm IP3. Have you actually measured that? If so what was the MDS? You can increase the IP3 of any receiver by reducing the RF amp gain or even eliminating it if M; /archives//html/Amps/1999-02/msg00551.html (14,308 bytes)
71. [AMPS] 6146 high imd/receivers (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 20 Feb 1999 22:29:34 -0800; Igor: Does the AOR 7030 plus spec give a number for MDS? Also, does it give the signal spacing used for the measurements? Most transceiver manufacturers use whatever signal spacing gives them a good; /archives//html/Amps/1999-02/msg00557.html (18,936 bytes)
72. [AMPS] Blowers, meters (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 27 Feb 1999 07:22:57 -0800; re Modutec meters: I believe the guy did find several sources for these meters. One was a major mail order house , I believe it was Newark, which had some of the sizes he needed in stock. He also was; /archives//html/Amps/1999-02/msg00686.html (8,895 bytes)
73. [AMPS] Tube dimension question (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 03 Jan 1999 07:54:31 -0800; Data sheet says 3.25 min to 3.42 max inches. That is from top of anode to bottom of grid ring. The grid ring is 0.235 wide. 73, Dan, N5AR -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissi; /archives//html/Amps/1999-01/msg00039.html (7,798 bytes)
74. [AMPS] Rapid Warmup Indirectly Heated Cathode Tubes (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 10 Jan 1999 18:58:38 -0800; Data sheets for most indirectly heated cathode tubes tell us that a warmup time of 3 minutes minimum is required for the cathode to reach operating temperature. Yet, I believe I was told that Collins; /archives//html/Amps/1999-01/msg00134.html (8,712 bytes)
75. [AMPS] Rapid Warmup Indirectly Heated Cathode Tubes (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 11 Jan 1999 07:40:29 -0800; Jon: I didn't make top of the honor roll (365 cfmd ) and 199 zones while sitting on my thumbs as my amp warmed up. Obviously I call barefoot while the amp warms up and sometimes make the contact that; /archives//html/Amps/1999-01/msg00141.html (9,610 bytes)
76. [AMPS] WTD:40-50A Switching Supply (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 23 Jan 1999 13:00:58 -0800; I have used the Astron SS25M . Regulation is a bit better than linear regulated supplies. Caution. Switchers generate numerous rf signals during their switching action. If you use coax feed to antenn; /archives//html/Amps/1999-01/msg00337.html (8,374 bytes)
77. [AMPS] Alpha 77DX grid current (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 23 Jan 1999 13:28:11 -0800; I have a single tube Alpha 77DX. The instruction book says "The 8877 is extremely rugged and operates with a large safety margin if grid current is never allowed to exceed 0.2 amperes, nor plate curr; /archives//html/Amps/1999-01/msg00338.html (7,749 bytes)
78. [AMPS] Re: Ceramic Caps in PA Tanks (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 24 Jan 1999 07:54:27 -0800; I am surprised that no mention has been made of the temperature coefficients of Centralab doorknob capacitors. These are usually stamped right on the cap. They are also in the Centralab catalog. They; /archives//html/Amps/1999-01/msg00363.html (11,011 bytes)
79. [AMPS] ARRL and QST (and CW Relevance) (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 28 Jan 1999 07:36:34 -0800; Well said Tom. You have a knack for getting to the heart of the matter. How many VHF distance records are made using SSB? How many EME contacts are made by modes other than CW? In WW2 there were case; /archives//html/Amps/1999-01/msg00528.html (12,536 bytes)
80. [AMPS] Dentron DTR 2000L (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 05 Dec 1998 19:35:26 -0800; Chris, I owned a DTR200L for several years and made a number of mods to improve it. Sold it about 6 months ago before moving to Spokane from Dallas. It has a number of good features. Excellent appear; /archives//html/Amps/1998-12/msg00076.html (9,774 bytes)

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