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Total 640 documents matching your query.

381. Re: [Amps] Hammond Manufacturing to take over P.W. Dahl Transformer Line (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 15 Feb 2013 19:01:29 -0500
Can't think of a better organization to take this on! Seems like a really good product line fit. Paul, W9AC -- Original Message -- From: "Jim Garland" <4cx250b@miamioh.edu> To: <amps@contesting.com>
/archives//html/Amps/2013-02/msg00122.html (9,657 bytes)

382. Re: [Amps] Expert 2K (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 4 Mar 2013 11:26:50 -0500
I saw the SPE 2K amp at last year's Orlando Hamcation. Overall build quality is excellent -- like the smaller 1K-FA. SPE has addressed the QSK problem that plagued early 1K units although they appear
/archives//html/Amps/2013-03/msg00051.html (10,316 bytes)

383. Re: [Amps] Expert 1k amp (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 7 Mar 2013 08:06:40 -0500
Steve, I did an unscientific check with my SPE 1K. Ripple on the RF envelope at the 1KW level is no worse than with my Alpha 77Dx and 87A at 1500W. It's just noticeable on the scope at the maximum po
/archives//html/Amps/2013-03/msg00076.html (9,852 bytes)

384. Re: [Amps] rms Volts, Amps and Watts (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 9 Mar 2013 17:37:31 -0500
rms voltage x rms current does not give rms power. It gives mean or average power. rms power can be calculated but has no useful value. An insightful perspective on "RMS Power" can be found here: htt
/archives//html/Amps/2013-03/msg00119.html (8,180 bytes)

385. Re: [Amps] SB-200 QSK mod info (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 27 Mar 2013 08:00:48 -0400
Vasily, Nice set of measurements. From what I can see, each relay is switching quite fast with the RF output relay lagging the RF input relay and bias by roughly 0.5 ms. This shouldn't be a problem w
/archives//html/Amps/2013-03/msg00341.html (10,986 bytes)

386. Re: [Amps] SB-200 QSK mod info (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 27 Mar 2013 09:37:09 -0400
From past measurements, transceivers like the Icom 7700/7800, and K3 all supply RF > 9 ms after amp key line closure. That should have read "...supply RF > 9 ms after the transceiver's *input* key li
/archives//html/Amps/2013-03/msg00345.html (7,789 bytes)

387. Re: [Amps] Molex Pins (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 30 Mar 2013 12:27:53 -0400
This is an obvious case of brain flatulence. I have ordered 4 different part numbers from Mouser for the *pins* only that fit the power connectors on Icom and other rigs. The standard 6 hole kind. I
/archives//html/Amps/2013-03/msg00370.html (7,939 bytes)

388. [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 3 May 2013 08:18:02 -0400
Not exactly Motorola transistor related but the subject reminded me of this: AC2IQ has developed an interesting pre-distortion "linearizer." http://www.qrz.com/db/AC2IQ Linearizers have been used in
/archives//html/Amps/2013-05/msg00036.html (9,497 bytes)

389. Re: [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 3 May 2013 20:34:40 -0400
Check out US Patent 4588958 by Allen Katz K2UYH. It's a common way to linearize solid state PAs for the cellular market back in the day. Great info, Jeff. Looks like K2UYH has multiple, related linea
/archives//html/Amps/2013-05/msg00053.html (8,756 bytes)

390. Re: [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 4 May 2013 09:27:01 -0400
This may change as more users become accustomed to using their SDR displays for diagnostic purposes, especially when the SDR in use is a direct DDC type. When using a device like the SDR-IQ and QS1R,
/archives//html/Amps/2013-05/msg00065.html (11,948 bytes)

391. [Amps] Amplifier Relocatable Power Tap (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 24 May 2013 10:34:02 -0400
Since constructing the W8ZR StationPro II (SPII), I've been thinking about ways to best manage AC power distribution for my desktop amps. The SPII is a station accessory designed to easily route RF,
/archives//html/Amps/2013-05/msg00173.html (11,263 bytes)

392. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Jun 2013 12:07:19 -0400
It might be helpful to look at the AMPS archives from one years ago. Specifically, look at May 1, 2012 for a discussion about water and vapor-phase cooling of solid-state devices. Paul, W9AC I believ
/archives//html/Amps/2013-06/msg00111.html (9,596 bytes)

393. Re: [Amps] The Pin One Problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 7 Jun 2013 14:32:03 -0400
'The problem is that it is not a "Ground loop"...' To Joe's point, a ground loop isn't even necessary to create a "Pin 1" problem. The problem always manifests when current induced on a shield modula
/archives//html/Amps/2013-06/msg00164.html (11,293 bytes)

394. Re: [Amps] The Pin One Problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 8 Jun 2013 08:34:36 -0400
One word ........ transformers. Audio transformers can be a convenient way to break-up grounding and RFI problems (owing to generally high CMRR figures) when interfacing equipment. Field engineers of
/archives//html/Amps/2013-06/msg00178.html (11,424 bytes)

395. [Amps] PSUD II Soft Start (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 9 Aug 2013 18:20:45 -0400
I am modeling a voltage doubler with PSUD II and the model is nearly identical to my real world measurements. However, what in the model is changing when "soft-start" is engaged? Is a resistance inse
/archives//html/Amps/2013-08/msg00067.html (7,133 bytes)

396. Re: [Amps] Dummy load. Can distilled water be used instead of oil ? (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sun, 11 Aug 2013 14:59:27 -0400
Used Altronic loads like the 9705 are typically under USD $500 used and about $900 new. The 9705 is good to 5KW and higher power models are even more prevalent on the used market. They do require ru
/archives//html/Amps/2013-08/msg00083.html (8,852 bytes)

397. Re: [Amps] Electron HOLE flow (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 28 Aug 2013 13:13:12 -0400
'For a brief time while the electron is in motion, there are actually two holes. Neither one "moves".' I can think of related examples of illusory flows and movement: current - when it's charge that
/archives//html/Amps/2013-08/msg00156.html (8,101 bytes)

398. Re: [Amps] Hole Flow (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Thu, 29 Aug 2013 08:17:47 -0400
Great description, Jim. You've answered some nagging questions that have bugged me for a long time. Paul, W9AC Sent from my iPhone5 _______________________________________________ Amps mailing list A
/archives//html/Amps/2013-08/msg00172.html (16,236 bytes)

399. Re: [Amps] Workshop Danger (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 13 Sep 2013 09:32:30 -0400
For the creation of specialized parts and plates, I've started using the same vendor that produces my PC boards. No room for a machine shop here, and honestly, I'm not much good beyond a drill press
/archives//html/Amps/2013-09/msg00112.html (11,804 bytes)

400. [Amps] Fwd: Rectifier equilization? (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sun, 15 Sep 2013 11:16:24 -0400
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2013-09/msg00184.html (10,962 bytes)


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