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References: [ +from:gm3sek@ifwtech.co.uk: 471 ]

Total 471 documents matching your query.

341. Re: [Amps] Power handling of an SMA (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 27 Apr 2011 15:36:42 +0100
Another trick is to file across each of the 4 holes with a 1/8in round file. File away to almost the full depth of the hole, leaving just a thin feather-edge of bare brass which is much easier to sol
/archives//html/Amps/2011-04/msg00561.html (8,874 bytes)

342. [Amps] Marv Gonsior W6FR (W6VFR) SK (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 11 May 2011 12:02:07 +0100
From yesterday's Daily DX* W6FR (ex W6VFR), Marwin H. Gonsior, of Fullerton, California passed away several weeks ago. He was 89. "Marv was a top notch DXer in years past and until recently he mainta
/archives//html/Amps/2011-05/msg00044.html (7,016 bytes)

343. Re: [Amps] Teflon Chimneys (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 14 May 2011 12:04:15 +0100
W2GN had very good results with brown mylar parcel tape In his ARCOS series of VHF/UHF amplifier kits (2 x 4CX250R/8930). The chimneys in my ARCOS K2RIW survived 20 years of very hot air. The method
/archives//html/Amps/2011-05/msg00096.html (8,446 bytes)

344. Re: [Amps] GS-35b heat sink (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 20 May 2011 13:07:28 +0100
That may not be true of modern high-performance heat sink compounds... but the second point below is the more important one: The poor surface finish of the GS35/GS31/GI7 metalwork is sure to be the g
/archives//html/Amps/2011-05/msg00173.html (8,656 bytes)

345. Re: [Amps] GS-35b heat sink (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 20 May 2011 15:16:53 +0100
With a 4CX250B, I first removed the lower part by carefully cracking the ceramic insulator in a large vice. The anode cooler can then be tidied up by sawing off the unwanted parts at top and bottom,
/archives//html/Amps/2011-05/msg00175.html (8,468 bytes)

346. Re: [Amps] Filament transformer needed (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 25 May 2011 08:12:53 +0100
Another option is a cheap packaged switch-mode supply, eg one of the 'Mean Well' series from eBay suppliers. This particular brand are very solidly built with good filtering and shielding, and a stra
/archives//html/Amps/2011-05/msg00212.html (8,846 bytes)

347. Re: [Amps] T/R relays for 2M (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 2 Jun 2011 08:35:06 +0100
This circuit may help. It delivers a 24V 'kick' from a normal 12V supply rail. The relay voltage then falls back to 12V, which is enough to hold in most 24V relays quite comfortably. An alternative u
/archives//html/Amps/2011-06/msg00003.html (8,416 bytes)

348. Re: [Amps] Dummy load varying R (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 10 Jun 2011 08:10:02 +0100
This is about much more than a higher price point. It's about a new generation of amateur-priced vector impedance meters that are in a totally different league from the traditional MFJs and Auteks. T
/archives//html/Amps/2011-06/msg00127.html (9,922 bytes)

349. Re: [Amps] Voltage Doubler Regulation (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 12 Jun 2011 21:28:27 +0100
Many more variables need to be taken into account. Voltage regulation in a doubler circuit will always be poorer than in a similar full-wave bridge, and the series resistance of the transformer windi
/archives//html/Amps/2011-06/msg00156.html (8,722 bytes)

350. Re: [Amps] al-811 wont transmit (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 19 Jun 2011 07:12:52 +0100
"No map, wouldn't ask, found it by accident"... that sounds familiar... Small change of topic, but do you also happen to play the bagpipes? <http://tinyurl.com/66rxsj8> -- 73 from Ian GM3SEK http://w
/archives//html/Amps/2011-06/msg00236.html (9,387 bytes)

351. Re: [Amps] GS35b FWB issue (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 11 Jul 2011 07:23:23 +0100
What transformer voltage? Also, have you checked the mains voltage? You imply that there have been some lightning strikes recently. Might the electricity company have been messing about with transfor
/archives//html/Amps/2011-07/msg00103.html (9,391 bytes)

352. Re: [Amps] GS35b FWB issue (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 11 Jul 2011 20:00:43 +0100
I agree with Carl. If all the diodes came from Mouser in the same purchase and some of them have been OK in the amp for 2-3 years until now, then it isn't the diodes. Something else in the power supp
/archives//html/Amps/2011-07/msg00114.html (9,188 bytes)

353. Re: [Amps] GS35b FWB issue (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 13 Jul 2011 07:18:49 +0100
Sorry, that isn't correct - I strongly RECOMMEND this surge limiting resistor, but I do not supply it in my kits because most builders prefer to find their own. Dave has already shown that his specif
/archives//html/Amps/2011-07/msg00127.html (9,531 bytes)

354. Re: [Amps] Supply question (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 20 Jul 2011 19:23:54 +0100
In almost every detail, that is flat-out WRONG. The AMPS archives contain plenty of accurate information on the subject of getters. Simply go to <http://lists.contesting.com/archives//html/Amps/> and
/archives//html/Amps/2011-07/msg00238.html (9,856 bytes)

355. Re: [Amps] Liquid cooling (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 25 Aug 2011 07:53:21 +0100
Good point. We aren't the only ones doing this, and we can learn from experience in other areas. Overclockers use water cooling with confidence, in a location where any leak would be disastrous. Part
/archives//html/Amps/2011-08/msg00171.html (10,894 bytes)

356. Re: [Amps] Liquid cooling (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 25 Aug 2011 11:11:04 +0100
Thanks, Roger - I learned a little more today. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2011-08/msg00174.html (9,516 bytes)

357. Re: [Amps] Ferrite toroids (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 27 Aug 2011 07:34:31 +0100
A very good resource for IDing toroid cores (and many other useful functions) is DL5SWB's 'Mini Ring Core Calculator': <http://www.dl5swb.de/html/mini_ring_core_calculator.htm> This program has data
/archives//html/Amps/2011-08/msg00203.html (8,233 bytes)

358. Re: [Amps] Big tubes (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 14 Oct 2011 07:22:35 +0100
One YC-156 owner has solved that problem by giving the heater transformer its own IP address. By the time he arrives home from work, it's ready. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _
/archives//html/Amps/2011-10/msg00041.html (8,247 bytes)

359. Re: [Amps] MOX resistors (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 19 Nov 2011 17:35:06 +0000
Metal film will be fine. The choice still doesn't seem very wide, but this one has a 750V rating (higher than the MOX equivalents) and is claimed to be in stock: <http://uk.farnell.com/vishay-bc-comp
/archives//html/Amps/2011-11/msg00078.html (8,105 bytes)

360. Re: [Amps] MOX resistors (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 19 Nov 2011 22:04:42 +0000
Not quite; gb.mouser.com looks like a UK operation, but it is actually a virtual storefront for the same US facility that you use. One day, all international ordering will be like this. We see price
/archives//html/Amps/2011-11/msg00087.html (8,312 bytes)

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