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References: [ +from:R@contesting.com: 541 ]

Total 541 documents matching your query.

241. Re: [Amps] Mine is bigger than yours (was: Re: Standby tubes (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 03 Apr 2005 15:38:34 -0400
Tom, N6BT, tells a similar story about a VOA curtain on Saipan. As I recall it, they were only using amateur power levels, but the antenna's gain and takeoff angle steering made quite a difference. 7
/archives//html/Amps/2005-04/msg00063.html (8,263 bytes)

242. Re: [Amps] re ebay and amps (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Tue, 12 Apr 2005 14:02:13 -0400
I'm a little perplexed by what Clive is saying here. ON4MA (Marc Wullaert) is a well-known contester -- 705 Google hits on the callsign alone. Is Clive the seller in the UK who Marc referred to in hi
/archives//html/Amps/2005-04/msg00225.html (8,770 bytes)

243. Re: [Amps] Skin Effect and Wire Current Capacity at HF (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Fri, 15 Apr 2005 01:43:26 -0700
E. F. Johnson rated its #14 gauge Cu roller coil at 3A @ 30MHz. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2005-04/msg00294.html (8,988 bytes)

244. Re: [Amps] highest ERP HF (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Thu, 21 Apr 2005 12:10:09 -0700
John -- I heard about a contester in the land of the rising sun that isn't all that far back. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mai
/archives//html/Amps/2005-04/msg00429.html (7,443 bytes)

245. Re: [Amps] Fwd:Re: More Rumors (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Thu, 21 Apr 2005 14:29:38 -0700
What kind of efficiency? What DC supply V? Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti
/archives//html/Amps/2005-04/msg00433.html (7,232 bytes)

246. [Amps] Z-meter measurements needed. (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sun, 24 Apr 2005 02:30:08 -0700
Is there someone in this group who can make parallel-equivalent resistance (a.k.a., Rp) measurements of a parallel L-R network c. 120MHz? What I would like to do is to compare a stock TL-922 parasiti
/archives//html/Amps/2005-04/msg00469.html (6,546 bytes)

247. [Amps] Shorting Sticks (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sun, 24 Apr 2005 10:20:10 -0700
A 0 (zero-ohm) shorting stick can damage an amplifier since there is virtually nothing to limit peak discharge current. If a 1000-ohm or so, 100 to 225 watt resistor is added in series with the short
/archives//html/Amps/2005-04/msg00484.html (6,573 bytes)

248. Re: [Amps] Bleeder Resistor Inquiry (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sun, 24 Apr 2005 10:28:23 -0700
With finer Ni-Cr wire, more turns, and more V, perhaps a turn to turn arc burns the wire open? Indeed, Gerald. I do not trust higher-value WW resistors at their published V-rating. Rich Measures, 805
/archives//html/Amps/2005-04/msg00485.html (8,856 bytes)

249. Re: [Amps] Shorting Sticks (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sun, 24 Apr 2005 14:26:47 -0700
If the multimeter in a g-g amplifier is left in the grid-I position, the amplifier is unplugged, and the B+ is shorted to ground when the HV filters are still well-charged, the shunt as well as the m
/archives//html/Amps/2005-04/msg00495.html (8,090 bytes)

250. Re: [Amps] Shorting Sticks (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 25 Apr 2005 03:05:26 -0700
The R in the stick. Perhaps it should be called a discharger-stick to more accurately describe what it does. According to my DMM, the 1k-ohm, 100w R in my discharger-stick has never opened. My guess
/archives//html/Amps/2005-04/msg00518.html (12,230 bytes)

251. Re: [Amps] Resistors (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 26 Apr 2005 04:07:53 -0700
Panasonic (Matsushita) makes fans that use "surface-wave" oilite bearings. As I recall, the life expectancy of them is c. 4x that of ball-bearing fans. Rich Measures, 805.386.3734, AG6K, www.somis.or
/archives//html/Amps/2005-04/msg00547.html (9,648 bytes)

252. Re: [Amps] L7 Question (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 26 Apr 2005 08:13:25 -0700
Fernando -- The only thoriated tungsten filament tubes that require a pre-heat have water-cooled filament support structures. In Ham stations outside Japan, these are fairly rare. Ordinary tubes like
/archives//html/Amps/2005-04/msg00554.html (8,552 bytes)

253. Re: [Amps] L7 Question (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 26 Apr 2005 11:57:35 -0700
3-500Zs reach full output in <1-second. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2005-04/msg00558.html (7,399 bytes)

254. Re: [Amps] DC Blocking Capacitor (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 26 Apr 2005 15:26:26 -0700
The value of the DC blocking cap is seeming less critical than is commonly thought. As I understand it, in most HF amplifiers, 200pF is enough. However, the I-handling ability become important on the
/archives//html/Amps/2005-04/msg00563.html (7,395 bytes)

255. Re: [Amps] DC Blocking Capacitor (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 26 Apr 2005 19:02:30 -0700
thanks, Phil. Tom Rauch said that a friend inadvertently used a 100pF D. C. blocker in a homebrew amp, and, when the mistake was discovered and corrected, it worked no better with 1000pF than with 10
/archives//html/Amps/2005-04/msg00567.html (9,895 bytes)

256. Re: [Amps] U.S. Military chooses Harris (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 28 Apr 2005 07:28:11 -0400
The Harris writeup says that the crypto is by way of an "ignition key" which can be removed from the keyboard, eliminating the need to secure the radio. This sounds like the scheme used with the STU
/archives//html/Amps/2005-04/msg00595.html (10,816 bytes)

257. Re: [Amps] eBay (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 04 May 2005 11:25:21 -0400
As for USA only, it used to be the case with foreign dollar-denominated checks that the bank fees to negotiate them were more than the amount of the check. PayPal should have remedied that situation.
/archives//html/Amps/2005-05/msg00055.html (14,612 bytes)

258. Re: [Amps] Transformer spec's for linear amplifier - added (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Thu, 7 Jul 2005 06:35:05 -0700
A good clue is the R of the secondary winding. This is discussed on my Web site. Another consideration is whether the current will be continuous - as for FM broadcasting - or intermittent - as for vo
/archives//html/Amps/2005-07/msg00048.html (8,466 bytes)

259. Re: [Amps] sb220 zener diode problems (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Fri, 8 Jul 2005 14:50:22 -0700
Bad zeners typically measure under 0.1-ohms in both directions. My guess is that the arcing in the SB-220 is being caused by an intermittent parasite at c. 110MHz. Reducing the Q of the VHF suppresso
/archives//html/Amps/2005-07/msg00066.html (11,794 bytes)

260. [Amps] sb220 zener diode problems (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sat, 9 Jul 2005 01:39:59 -0700
The cooling fan in a SB-220 directs high-velocity air at the filament pins. However, if the fan bearings are not periodically oiled, the cooling fan will slow and the solder will go. - notes - When s
/archives//html/Amps/2005-07/msg00074.html (14,365 bytes)

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