Mail Archive Search: <+from:g8gsq@ic24.net>

Results:

References: [ +from:g8gsq@ic24.net: 257 ]

Total 257 documents matching your query.

221. Re: [Amps] CW and High Voltage (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 04 Sep 2005 08:07:10 +0100; The tank circuit is an impedance transformer. It converts the load impdance (typ. 50 ohms) to the high resistance presented to the tube plate - typ. 2-4k. If you don't touch the tuning controls, the; /archives//html/Amps/2005-09/msg00033.html (10,464 bytes)
222. Re: [Amps] power supply capacitors (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 04 Sep 2005 09:20:35 +0100; Looking at the Dubilier 560uF/400V cap that Mouser sells, size 35mm dia, 35mm high: Ripple current rating is 2.7A. In a typical capacitor input supply, that's equivalent to around 1.5A dc into the lo; /archives//html/Amps/2005-09/msg00034.html (8,034 bytes)
223. [Amps] 813 info. (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 05 Sep 2005 17:13:46 +0100; Does anyone have/know of constant current curves for 813 when connected as a triode (g1, g2 tied together). Thanks, Steve _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2005-09/msg00055.html (6,237 bytes)
224. Re: [Amps] Query: AC Switching of High voltage (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 07 Sep 2005 15:07:16 +0100; Unless there's an interlock to prevent tx when ht is missing. Modifying the 1min timer to 3min strikes me as safer and probably easier - or make a 3 minute timer and put it in the tx control lead bet; /archives//html/Amps/2005-09/msg00069.html (7,501 bytes)
225. Re: [Amps] Is there any VISIBLE difference of 4CX1000A and 4CX1500B ?? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 13 Sep 2005 10:28:20 +0100; Eimac data says 4CX1000A runs 6V/9A heater, 6V/10A for 4CX1500B. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2005-09/msg00110.html (7,207 bytes)
226. Re: [Amps] AL-80A "spitting" on 80m, Relay problems. (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 15 Sep 2005 07:36:53 +0100; It's Volts, not Watts that causes the arcing. Your antenna appears to have a high enough impedance to produce really high voltage at 600W. What VSWR is the tuner is rated to match at 2kW - and is thi; /archives//html/Amps/2005-09/msg00127.html (7,872 bytes)
227. Re: [Amps] Teflon isolation ? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 16 Sep 2005 14:43:39 +0100; I've just tried a piece with dc hipot. At 14kV an airgap of about 8mm sparks over, so that's the limit of test with the sample I have. I've had problems with minute bits of swarf puncturing the ptfe; /archives//html/Amps/2005-09/msg00137.html (7,233 bytes)
228. Re: [Amps] RE : Alpha releases New Amp 9500 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 16 Sep 2005 16:51:01 +0100; How much extra for the optional 'junk mail' filter? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-09/msg00144.html (6,582 bytes)
229. Re: [Amps] Drying out HV transformers / Chokes (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 18 Sep 2005 08:14:30 +0100; Self heating? An untried idea - short one of the windings, and apply a little voltage to the other with a variac and let the thing warm up gradually, increasing the voltage until it sits at 50C/120F; /archives//html/Amps/2005-09/msg00200.html (7,074 bytes)
230. Re: [Amps] Tank Coil Cooling (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 19 Sep 2005 07:48:01 +0100; There's a thing of beauty! I'd guess it's a matching network for rf excited plasma etching or deposition. Steve _______________________________________________ Amps mailing list Amps@contesting.com h; /archives//html/Amps/2005-09/msg00226.html (6,779 bytes)
231. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 20 Sep 2005 09:19:04 +0100; You could see the same effect if the tank coil inductance is too low - eg if part of it was shorted out when it should be in circuit. Max load cap. gives you a high anode load resistance. The circuit; /archives//html/Amps/2005-09/msg00235.html (8,222 bytes)
232. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 20 Sep 2005 10:02:13 +0100; Can't see a problem with trying it as an experiment - I'd been thinking along the lines of whether part of the coil was left shorted by the bandswitch. I don't know the amp, but from what I read that; /archives//html/Amps/2005-09/msg00237.html (9,672 bytes)
233. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 20 Sep 2005 12:10:09 +0100; Efficiency as high as 75% indicates heavy saturation, which ties up with the high anode load resistance. You will be getting higher gain, but at the expense of linearity and maximum output power. I'd; /archives//html/Amps/2005-09/msg00241.html (8,439 bytes)
234. Re: [Amps] Finger stock supplier (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 21 Sep 2005 08:19:38 +0100; Both have ranges - the problem with what they sell is that the stuff that looks most appropriate has double sided adhesive tape exactly where you want to solder to. It's very difficult to remove and; /archives//html/Amps/2005-09/msg00252.html (9,407 bytes)
235. Re: [Amps] 4CX1500B (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 22 Sep 2005 21:04:35 +0100; It's one way to get a number. Whether it's accurate depends on the signal level, the characteristics of the receiver filter, and maybe its LO phase noise, amongst other things. In the end, an exact n; /archives//html/Amps/2005-09/msg00297.html (8,108 bytes)
236. Re: [Amps] AL-811H etc (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 01 Oct 2005 15:04:02 +0100; Also, don't forget that the Rp seen by the tube is the Rs (series equivalent resistance) of the suppressor network at the vhf frequency in question. Steve ____________________________________________; /archives//html/Amps/2005-10/msg00008.html (7,757 bytes)
237. Re: [Amps] Tube Identification (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 05 Oct 2005 07:28:30 +0100; Likelyhood is they are 4CX250s, with custom marking to secure spares business at generous prices. Sometimes there's non-standard testing to verify particular characteristics for the customer. Steve _; /archives//html/Amps/2005-10/msg00123.html (6,961 bytes)
238. Re: [Amps] Power Supplies and Blowers (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 06 Oct 2005 21:16:47 +0100; I've taken to using Comair Rotron Spinnaker blowers - they're small, good value, around $60-70, and you can get dc versions so you can easily turn down the noise/airflow when you don't need it. It e; /archives//html/Amps/2005-10/msg00161.html (7,524 bytes)
239. Re: [Amps] 80B (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 10 Oct 2005 07:45:15 +0100; Don't be shy - do tell us how. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-10/msg00238.html (6,219 bytes)
240. Re: [Amps] Low power output from 4-400A linear (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 11 Oct 2005 15:40:36 +0100; Efficiency and grid current are both high - suggests it's saturating hard so you could just try loading it heavier. You'll lose some gain, but should get more output if you crank up the drive. Steve; /archives//html/Amps/2005-10/msg00273.html (8,228 bytes)

Current List: 221 - 240
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]