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

Total 562 documents matching your query.

301. Re: [Amps] How, and at what stage in production, are vac variable (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 Apr 2014 10:09:11 -0400
On 4/1/2014 4:24 AM, Ian White wrote: Jim is right, because both ceramic and glass vacuum variables are designed to be pumped and sealed just one time - when they are being manufactured. Manufacturin
/archives//html/Amps/2014-04/msg00003.html (15,388 bytes)

302. Re: [Amps] Where post useful info? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 02 Apr 2014 03:31:10 -0400
Where on Internet should I offer this advice? E-mail me @ k8ri@rogerhalstead.com and I'll try to give a plain language explanation before running on too long here. Create a page, get a URL, Post a bi
/archives//html/Amps/2014-04/msg00011.html (8,591 bytes)

303. Re: [Amps] Where post useful info? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 02 Apr 2014 14:43:03 -0400
Carl Mine is highly ham oriented, but no blog although I could have one at no extra cost. With photos of rebuilding an HT33B amp, complete instructions on rebuilding a PST61 rotator, tower project, e
/archives//html/Amps/2014-04/msg00018.html (8,159 bytes)

304. Re: [Amps] ALS-600 vs ALS-1300 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 11 Apr 2014 00:17:32 -0400
Too bad the Tokyo Hy Power amps are no longer made. They were good looking, well made, good performing amps burning up. DXing, contesting, or satisfaction, that extra 3db sometimes makes a a big diff
/archives//html/Amps/2014-04/msg00130.html (11,220 bytes)

305. Re: [Amps] Using computer CPU coolers on GI46b triode ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 12 May 2014 01:27:34 -0400
On 5/9/2014 3:53 PM, Steve Gorecki VE3RX wrote: Speaking from the CPU side of things, most CPU coolers cool a CPU that gives off about 65-135W of heat. Usually not any more than that. Thus, depending
/archives//html/Amps/2014-05/msg00069.html (12,845 bytes)

306. Re: [Amps] Rigol DMM (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 12 May 2014 05:04:15 -0400
On 5/12/2014 2:57 AM, Jim Brown wrote: On 5/10/2014 9:09 AM, Paul Christensen wrote: In case you haven't yet checked the EEVBlog forum, there are several discussions on the DM3058E including display
/archives//html/Amps/2014-05/msg00071.html (8,668 bytes)

307. Re: [Amps] 3-500Z pin comes unsoldered (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 14 May 2014 02:47:09 -0400
Many, not all 3-500 amps have a problem with overheating filament pins and melting solder, This is primarily an air flow problem. NOTE, once the tube socket pins have over heated, they are likely sho
/archives//html/Amps/2014-05/msg00087.html (8,352 bytes)

308. Re: [Amps] Ion Pump (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 19 Jul 2014 18:49:41 -0400
Hello John, Ion Pumps are worthy of a wikipedia check. They are used in high vacuum systems, once the vacuum is established with a roughing pump such as a Roots blower style or mechanical chug-chug r
/archives//html/Amps/2014-07/msg00083.html (12,755 bytes)

309. Re: [Amps] Ion Pump (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 20 Jul 2014 18:33:44 -0400
General Electric was one of the first to recognize that vacuum tubes (their Pliotrons and Kenotrons) required better vacuum than the Audion's had that were made by DeForest companies. So naturally, a
/archives//html/Amps/2014-07/msg00085.html (10,869 bytes)

310. Re: [Amps] Ion Pump (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 20 Jul 2014 22:02:04 -0400
This is well outside my realm of experience. The claim of 1 X 10^-12 would be extremely difficult to obtain. https://en.wikipedia.org/wiki/Vacuum . So far, I've not found a definitive answer to the a
/archives//html/Amps/2014-07/msg00087.html (13,647 bytes)

311. Re: [Amps] Ion Pump (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 21 Jul 2014 08:06:33 -0400
It is also consistent with John's comment that pressures higher than about 10^-7 torr will lead to problems with arcing, while anything lower Although we're talking 30 years ago and techniques we use
/archives//html/Amps/2014-07/msg00090.html (8,959 bytes)

312. Re: [Amps] Experience with Heart Pacemakers? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 02 Aug 2014 16:09:08 -0400
I have a Defib/pacemaker. The "only restrictions are no cellphone in my shirt pocket and when welding (yes welding) route the cables away from my core, IOW bring them in from the side or above (away
/archives//html/Amps/2014-08/msg00007.html (10,372 bytes)

313. Re: [Amps] Experience with Heart Pacemakers? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 02 Aug 2014 18:13:27 -0400
A grounded screen wall/enclosure shields only the electric field and the EM field. It is completely ineffective for magnetic shielding, and that's the potential hazard of the amp. Jim, most "present
/archives//html/Amps/2014-08/msg00011.html (10,165 bytes)

314. Re: [Amps] Experience with Heart Pacemakers? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 02 Aug 2014 21:36:11 -0400
Much like the Government. It's nothing more than a CYA unless they have some "old school" people on board. Like Glen I can not have an MRI. . 73 Roger (K8RI) On a more practical observation, my 95 ye
/archives//html/Amps/2014-08/msg00016.html (8,074 bytes)

315. Re: [Amps] Experience with Heart Pacemakers? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 03 Aug 2014 16:06:29 -0400
They had a mandate to label everything that was above 1 V/m which is far below the 1 or 0.1 mW/cm^2 power density that RF safety regulations from OSHA, FCC and IEEE are concerned with. There is not a
/archives//html/Amps/2014-08/msg00022.html (10,964 bytes)

316. Re: [Amps] pacemakers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 05 Aug 2014 16:38:35 -0400
On 8/5/2014 2:08 PM, Dave AA6YQ wrote: With respect to the question "is it safe to use QRO if I have a pacemaker?", the necessary assertion isn't "some QRO ops with pacemakers have not experience dev
/archives//html/Amps/2014-08/msg00035.html (8,713 bytes)

317. Re: [Amps] Fwd: Deep Brain Stimulation for Parkinson's treatment and RF in the ham shack (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 08 Aug 2014 03:44:02 -0400
Sent from my Verizon Wireless 4G LTE Smartphone I have been avidly following the discussion on rf exposure and the possible negative consequences on human heart pacemakers. Im scheduled for surgery i
/archives//html/Amps/2014-08/msg00040.html (16,329 bytes)

318. Re: [Amps] HV Diodes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 17 Oct 2014 01:52:23 -0400
Exciting things to come in 2015 in the QRO solid state market. Trust me on this :) To sell to us they don't need certification. Of course they'd sell a lot more with certification and dealers which w
/archives//html/Amps/2014-10/msg00104.html (10,224 bytes)

319. Re: [Amps] 3CX3000s (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 17 Oct 2014 17:10:25 -0400
My only complaint is they are so darn big. Even with the remote power supply the RF deck is big. I've seen some nice construction, but they lack the finish and still look home made. Of course, you ge
/archives//html/Amps/2014-10/msg00134.html (10,902 bytes)

320. Re: [Amps] Solid State Amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 18 Oct 2014 20:37:37 -0400
On 10/18/2014 1:23 PM, Manfred Mornhinweg wrote: Chris, I think that even the displays for smart phones and hand held devices are generic. It's the drivers that are custom. In essence they are nothin
/archives//html/Amps/2014-10/msg00176.html (12,445 bytes)

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