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Total 562 documents matching your query.

381. Re: [Amps] 8877 Grid Current (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 8 Nov 2015 19:21:47 -0500
As nothing else changes, I'd suspect a metering issue. Resistors, switch, or the meter? 73 Roger (K8RI) I have an Alpha 9500 with an interesting issue. The grid current slowly falls to near zero (les
/archives//html/Amps/2015-11/msg00029.html (8,019 bytes)

382. [Amps] Amplifier Vs Plate Modulated (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 26 Nov 2015 01:27:20 -0500
I've posted the following on two group. They are not cross posted. Please do not cross post answers. If you must post to both groups, please cut and past rather than cross posting. Thanks! OK, I unde
/archives//html/Amps/2015-11/msg00155.html (8,424 bytes)

383. Re: [Amps] Ugly Amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 1 Dec 2015 20:17:25 -0500
Too bad I never took any photos of my old 6C21 amp. I hear tell that the signal was about as clean as the amp looked LMAO When I was on 40, I found out later that I took out 40 for most of the town.
/archives//html/Amps/2015-12/msg00005.html (9,391 bytes)

384. Re: [Amps] More on "baby ur radio" (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 23 Dec 2015 20:05:13 -0500
Semiconductor device aging is not a yes or no question. To pick nits, Yes they all do, but at vastly different rate when used within their ratings. As has been noted, The certainly do last far longer
/archives//html/Amps/2015-12/msg00054.html (14,870 bytes)

385. Re: [Amps] More on "baby ur radio" (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 23 Dec 2015 21:20:35 -0500
Migration is a fact of life and common to all bipolar transistor. See my earlier post. It is intrinsic to the purity material used. IE: Newer is better. It is not a manufacturing defect and is entire
/archives//html/Amps/2015-12/msg00056.html (9,732 bytes)

386. Re: [Amps] 813's (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 25 Dec 2015 18:17:19 -0500
I built up a pair of 813s based on the single band amps in QST or the Handbook back in the early 60s. I used a B&W 850A Tank IIRC after my infamous 6C21. I drove them with a number of rigs from the H
/archives//html/Amps/2015-12/msg00061.html (9,657 bytes)

387. Re: [Amps] worthwhile patents on RF amplifiers? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 15 Feb 2016 23:28:34 -0500
I'm no expert on patents although I learned more than I wanted with the company I worked for. Most of their products were based on a propitiatory process and not patented. The rational was that witho
/archives//html/Amps/2016-02/msg00046.html (12,881 bytes)

388. Re: [Amps] Supplier for RD16HHF1 transistor ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 22 Feb 2016 22:56:46 -0500
In general, bipolar transistors are about the easiest to substitute RF devices we have at our disposal. That doesn't mean there are substitutes for all specific installations, or every transistor. Ty
/archives//html/Amps/2016-02/msg00053.html (9,999 bytes)

389. Re: [Amps] Impressive solid-state 1.5 kW amp (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 26 Feb 2016 00:59:51 -0500
There is a link on the first page to a manual as a PDF. Pictures of the PS, but computer drawings of the RF deck 73 Roger (K8RI) On 2/24/2016 Wednesday 5:19 PM, Bill Turner wrote: That does look inte
/archives//html/Amps/2016-02/msg00064.html (10,424 bytes)

390. Re: [Amps] Impressive solid-state 1.5 kW amp (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 26 Feb 2016 01:15:35 -0500
I could get that much on six from my Tokyo Ky-Power which only ran a KW on HF 73 Roger (K8RI) Given the active devices, why is the amplifier only spec'd for half power on six meters? Looks like a pro
/archives//html/Amps/2016-02/msg00066.html (9,716 bytes)

391. Re: [Amps] Impressive solid-state 1.5 kW amp (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 28 Feb 2016 07:42:44 -0500
That's probably why I couldn't find those links yesterday. 73 Roger (K8RI) That does look interesting. I didn't see a link to download the owner's manual so I will be emailing them to see if one is a
/archives//html/Amps/2016-03/msg00002.html (9,139 bytes)

392. [Amps] Alpha Auto tuner (Impressive solid-state 1.5 kW amp) (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 28 Feb 2016 07:46:08 -0500
Which reminds me. Did Alpha ever come out with that tuner. I was on the waiting list and have heard nothing. 73 Roger (K8RI) On 2/26/2016 Friday 6:33 PM, mark bitterlich wrote: Can you say alpha 4 kW
/archives//html/Amps/2016-03/msg00003.html (8,220 bytes)

393. Re: [Amps] SB220 on 120V (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 6 Apr 2016 01:10:43 -0400
10A is pushing your luck. That's 1200 Watts total on that circuit and the wire for a 10A circuit will give plenty of voltage drop under load. All my 120 VAC circuits are either 15A, or 30A with appro
/archives//html/Amps/2016-04/msg00005.html (8,572 bytes)

394. Re: [Amps] Anybody remember... KW mobile amp installation (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 14 Jun 2016 01:16:45 -0400
I remember a guy with a Collins S-line including a 30S1 in his Cadillac, but nothing more. 72, Roger (K8RI) On 6/10/2016 Friday 5:01 PM, John Simmons wrote: I am searching for a copy of an article fr
/archives//html/Amps/2016-06/msg00048.html (9,082 bytes)

395. Re: [Amps] Anybody remember... KW mobile amp installation (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 17 Jun 2016 01:04:24 -0400
I have QST on disk, all the way back, but the early versions leave a lot to be desired. I'll try to remember to search QST of the 60s. Too bad there isn't a master index. 73 Roger (K8RI). I looked on
/archives//html/Amps/2016-06/msg00065.html (10,205 bytes)

396. Re: [Amps] SCR to adjust 240v to 200v (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 12 Aug 2016 22:13:09 -0400
I've used a lot of high power SCRs in industry and built controllers using them. As Roy said, they will likely prove to be very difficult because of the tremendous hash they create. An SCR is turned
/archives//html/Amps/2016-08/msg00012.html (10,388 bytes)

397. Re: [Amps] SCR to adjust 240v to 200v (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 21 Aug 2016 06:21:02 -0400
In the early days, we just used a Diac in a simple circuit. No big pulse and no series of pulses. Once the threshold was reached, the SCR was in control of the rest including how fast it turned on. W
/archives//html/Amps/2016-08/msg00056.html (12,034 bytes)

398. Re: [Amps] LDMOS HEAT SPREADERS (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 31 Aug 2016 04:19:03 -0400
There should be hundreds of those heat transfer blocks (solid Copper) available at computer repair shops. Every time they install a new CPU that came with a cooler, be it water or vapor phase, there
/archives//html/Amps/2016-08/msg00077.html (13,717 bytes)

399. Re: [Amps] LDMOS HEAT SPREADERS (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 31 Aug 2016 13:36:17 -0400
I'm running 8 core CPUs OCd to 5 GHz. They require water cooling. The only time the dump a lot pf heat, is either gaming, or serious number crunching. Few processors run anywhere near their max ratin
/archives//html/Amps/2016-08/msg00082.html (15,118 bytes)

400. Re: [Amps] Acom 2000A - typical output power? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 11 Sep 2016 04:33:05 -0400
I think the Emtron DX-2sp and DX-3sp will run that power all day long, but they are now going to be made in the USA and I doubt the regs will let them continue to run the gain. They are big, heavy an
/archives//html/Amps/2016-09/msg00028.html (10,761 bytes)

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