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References: [ +from:k8ri@rogerhalstead.com: 562 ]

Total 562 documents matching your query.

281. Re: [Amps] Crouzet SSR - FAQs (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 11 Feb 2014 11:13:58 -0500
On 2/11/2014 2:27 AM, Jim Thomson wrote: Message: 8 Date: Mon, 10 Feb 2014 19:46:26 -0600 From: "Paul Kraemer" <elespe@lisco.com> To: <amps@contesting.com> Subject: [Amps] Crouzet SSR - FAQs There is
/archives//html/Amps/2014-02/msg00097.html (12,383 bytes)

282. Re: [Amps] Solid state relays..again (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 11 Feb 2014 11:21:15 -0500
On 2/11/2014 8:53 AM, Jim Thomson wrote: When I had my old drake T4XC transmitter, about every 40th time I turned it on.... it just went click and turned on. The other 39 times it made a helluva thum
/archives//html/Amps/2014-02/msg00098.html (8,734 bytes)

283. Re: [Amps] Solid state relays..again (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 11 Feb 2014 17:44:29 -0500
My guess is the noise has to do with the hysteresis loop of the transformer core and where on the loop the power supply was at turn-off I have no idea as to the width of the bh curve, but what I reme
/archives//html/Amps/2014-02/msg00100.html (8,157 bytes)

284. Re: [Amps] Plate Voltage Not Stable (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 15 Feb 2014 22:50:15 -0500
I had one of the low voltage caps in an almost new DTR2000 blow the can right off the cap. It hit the top of the cabinet so hard, it looked like a 38 wad cutter that had hit something hard and it was
/archives//html/Amps/2014-02/msg00140.html (10,886 bytes)

285. Re: [Amps] A Professionally Built Amplifier Claim (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 17 Feb 2014 03:20:21 -0500
The only thing is that there are illegally operating 47CFR Part 95 Subpart D ("CB" to the unwashed) operators, or "freeband" operators, who are willing to pay the asking price! Glen, K9STH Definition
/archives//html/Amps/2014-02/msg00160.html (8,576 bytes)

286. Re: [Amps] Force cooled heatsink aerodynamics (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 17 Feb 2014 18:56:57 -0500
I have one of these heatsinks that have two 120 mm side by side and it is with the air flow chamber. The chamber is just an empty box about the thickness of the fans, in my case perhaps 35-40 mm. It
/archives//html/Amps/2014-02/msg00162.html (8,759 bytes)

287. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 20 Feb 2014 20:23:34 -0500
On 2/20/2014 9:51 AM, Jack C. Shutt wrote: Yes, that Dayton blower is a good one to use, however, it is still quite loud even with the slower speed. Of course, you can reduce the fan speed on receive
/archives//html/Amps/2014-02/msg00195.html (12,232 bytes)

288. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 20 Feb 2014 23:58:17 -0500
Another approach is to locate the blower inside the amplifier and only pressurize the tube from the bottom. Ameritron AL1200,1500 and maybe others work that way and have much lower blower noise. The
/archives//html/Amps/2014-02/msg00199.html (12,501 bytes)

289. Re: [Amps] Duty cycle for processed SSB in contest conditions? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 22 Feb 2014 16:17:31 -0500
On 2/22/2014 12:25 PM, Conrad Farlow wrote: Can anyone suggest what the duty cycle for sensibly processed SSB would be during contest conditions? When an LD-MOS PA is backed off to achieve good linea
/archives//html/Amps/2014-02/msg00220.html (9,110 bytes)

290. [Amps] Another Re: Working on my Darwin award (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 23 Feb 2014 05:12:55 -0500
Another one: Years ago (early to mid 60's, I had an HT44/SX117 combination on a bench about 30" high down in the basement. I needed to measure the plate current which was done across a resistor in th
/archives//html/Amps/2014-02/msg00232.html (11,002 bytes)

291. Re: [Amps] Duty cycle for processed SSB in contest conditions? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 23 Feb 2014 05:43:22 -0500
Only recently have SS rigs began to approach the IM figures of the old Collins S-Line. Even some of the mighty expensive rigs have pretty crappy IM figures.< SM5BSZ has done some work on this, and l
/archives//html/Amps/2014-02/msg00233.html (12,286 bytes)

292. Re: [Amps] Working on my Darwin award (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 24 Feb 2014 21:48:10 -0500
But don't count on it. It can go into fibrillation or as stated, stop. Although... I don't know if this sort of thing can cause fibrillation or just stop it. I'm a computer guy, mot a Med Tech. In ei
/archives//html/Amps/2014-02/msg00254.html (12,136 bytes)

293. Re: [Amps] Working on my Darwin award (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 25 Feb 2014 05:11:03 -0500
For 26 years I was not permitted to wear rings, metal watch band, or a beard at work. The ring doesn't even fit anymore. 73 Roger (K8RI) 1. Never wear jewellery - rings, bracelets, neck chains etc wh
/archives//html/Amps/2014-02/msg00256.html (9,886 bytes)

294. Re: [Amps] Working on my Darwin award (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 26 Feb 2014 01:17:38 -0500
9. Never set a 14" long crescent wrench on a 1700 amp-hour battery. You will need to change shorts and your crescent wrench will turn into molten balls about the size of BBs. And once you drop it, do
/archives//html/Amps/2014-02/msg00259.html (10,764 bytes)

295. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 01 Mar 2014 00:33:51 -0500
Silver chloride is used in ion exchange, or flash plating. It may be used in electroplating, but I never used it in electroplating. Silver cyanide is used in smooth electroplating, (electronic and de
/archives//html/Amps/2014-03/msg00000.html (9,142 bytes)

296. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 03 Mar 2014 12:24:40 -0500
We use it often at work. It's expensive. It doesn't do squat for improving the conductivity of surfaces like cavities and inductors for RF current, as Peter pointed out. That requires at least 3 to 5
/archives//html/Amps/2014-03/msg00016.html (10,545 bytes)

297. Re: [Amps] Triband balun (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 19 Mar 2014 21:05:27 -0400
ny suggestions for a better alternative that will hold up in a RTTY contest? Thanks, Gary KA1J REPLY: I had the same problem many years ago. Hy-Gain made a replacement balun called the something-2000
/archives//html/Amps/2014-03/msg00115.html (8,957 bytes)

298. Re: [Amps] Triband balun (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 21 Mar 2014 05:19:28 -0400
If you want to make a balun by coiling up a bunch of coax you should check this out first. Removes all the anecdotal BS and gives you something real to work with. http://www.k1ttt.net/technote/airbal
/archives//html/Amps/2014-03/msg00119.html (12,551 bytes)

299. Re: [Amps] WTB chimney (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 24 Mar 2014 20:53:16 -0400
I have a couple of tubes and sockets, but AFAIK there is only one chimney. They only go as a set. I'm trying to decide between a 4CX3000, pair of 4CX1500Bs, FU728Fs, YC156...or something else. I have
/archives//html/Amps/2014-03/msg00144.html (7,627 bytes)

300. Re: [Amps] Dummy load. Can distilled water be used instead of oil ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 29 Mar 2014 01:56:21 -0400
Water makes a good heat sink Water is about the best conductor (most effective) of heat you can find. There is a table listing water Vs various other compounds although I've forgotten the URL. I do
/archives//html/Amps/2014-03/msg00184.html (11,627 bytes)

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