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301. Re: [Amps] Inexpensive variable air cap for amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 5 Sep 2006 20:23:39 +0200 (CEST); When jackson Bros were in business, they did do some specials which had the teflon film in them. It didn't increse the voltage rating by a lot, but it did increase the capacity - bath max and min. Af; /archives//html/Amps/2006-09/msg00104.html (7,434 bytes)
302. [Amps] SPAM (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 6 Sep 2006 23:02:51 +0200 (CEST); Are you guys starting to gets lots of spam suggestive that the AMPS or Towertalk reflectors have been 'harvested'? 73 Peter G3RZP _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2006-09/msg00128.html (7,015 bytes)
303. Re: [Amps] Vacuum variable testing? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 10 Sep 2006 12:49:26 +0200 (CEST); WA2TAK asked: A HiPot tester is the usual way. You do need to make sure the outer is clean and dry first, with no finger grease. If it's a glass one, then any current limited HV supply will do - they; /archives//html/Amps/2006-09/msg00165.html (7,343 bytes)
304. Re: [Amps] amp tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 10 Sep 2006 16:52:22 +0200 (CEST); If the Chinese 572s give more output because there's more gain, it suggests that the driver is a bit short on output, and it isn't big enough to drive a pair of 572s to full output. Is that really th; /archives//html/Amps/2006-09/msg00173.html (7,800 bytes)
305. Re: [Amps] Parasitic suppressors on GI-7B. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 10 Sep 2006 17:21:32 +0200 (CEST); VK3ZL asked abput parasitic suppressors......... At the risk of another AMPS reflector war.... If the parasitic circuitry of the anode is resonant below that of the grid, it won't oscillate. The GI7B; /archives//html/Amps/2006-09/msg00174.html (9,756 bytes)
306. Re: [Amps] Parasitic suppressors on GI-7B. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 11 Sep 2006 22:04:59 +0200 (CEST); carbon.< Where I somewhat disagree is that 2 or 3 watt resistors provide enough dissipation. However, like all these things 'it all depends' If you have a tube prone to parasitics and needing a large; /archives//html/Amps/2006-09/msg00183.html (8,254 bytes)
307. Re: [Amps] Technical specification question, possibly OT ! (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 11 Sep 2006 22:21:32 +0200 (CEST); have to say about this.< Tests born of total ignorance from an establishment after making money. The terms 'occupied bandwidth' and 'necessary bandwidth' are somewhat artificial anyway. I claim autho; /archives//html/Amps/2006-09/msg00185.html (7,769 bytes)
308. Re: [Amps] Technical specification question, possibly OT ! (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 12 Sep 2006 09:23:24 +0200 (CEST); Do you know where in ETSI or CEPT? I go to the ETSI committees which I would expect to handle this, (ERM_RM, ERM, and occasionally ERM_EMC)although admittedly, I don't go to CEPT PT SE21. I do have a; /archives//html/Amps/2006-09/msg00187.html (8,370 bytes)
309. Re: [Amps] 572B bias FL2100 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 12 Sep 2006 09:28:14 +0200 (CEST); neutralization system I've ever seen in an HF amplifier. It's a capacitor from the loading cap to the filament of the tube!< I would have thought with my simple mind that is more likely to make a pow; /archives//html/Amps/2006-09/msg00188.html (7,320 bytes)
310. Re: [Amps] Technical specification question, possibly OT ! (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 12 Sep 2006 16:00:59 +0200 (CEST); Karl Arne, OK, Karl-Arne, thanks. No problems there - I was heavily involved in producing that document and especailly that Annex, and it merely reflects ITU-R SM329 with some easings to take into ac; /archives//html/Amps/2006-09/msg00189.html (8,260 bytes)
311. Re: [Amps] Kilovac HC-2 Mounting Nut (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 15 Sep 2006 11:53:23 +0200 (CEST); M14x1.5 nuts I could find were too coarse for the fine threads on the relay. The spec sheet identifies the threads as M14x1.5-6g. Not sure what the "-6g" means; something to do with "fine" thread?< T; /archives//html/Amps/2006-09/msg00200.html (7,457 bytes)
312. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 25 Sep 2006 09:01:42 +0200 (CEST); problems< That's where I'd start. Is there a ground loop through the AC supply, for instance? I've seen this sort of thing happen when you get a current on the outside of the coax, and the effects sh; /archives//html/Amps/2006-09/msg00303.html (8,675 bytes)
313. Re: [Amps] *** SPAM *** Re: Titan 425 Reflected Power (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 26 Sep 2006 10:53:55 +0200 (CEST); would never occur.< Had one on an oil rig installation in the early '70s. Operating at 2MHz (roughly), the SWR varied with the linear on and off - that was using both a Bird and SWR meter made in ho; /archives//html/Amps/2006-09/msg00314.html (7,425 bytes)
314. [Amps] Is Amps still in existence? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 8 Oct 2006 16:28:10 +0200 (CEST); This reflector appears to have got very quiet. Have a lot of people left, or does having Rich banned reduce the traffic to such an extent that it almost appears that the reflector may as well not exi; /archives//html/Amps/2006-10/msg00047.html (7,115 bytes)
315. Re: [Amps] Is Amps still in existence? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 8 Oct 2006 20:41:16 +0200 (CEST); Ian, What size is the coil former? I may have something in ceramic that would do..... 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2006-10/msg00058.html (8,278 bytes)
316. Re: [Amps] Is Amps still in existence? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 9 Oct 2006 10:43:24 +0200 (CEST); very unlikely to have holes in the right places for securing the two separate windings. That's where a Teflon former would score, in terms of being able to drill it easily.< If it's getting hot enoug; /archives//html/Amps/2006-10/msg00067.html (8,840 bytes)
317. Re: [Amps] Is Amps still in existence? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 9 Oct 2006 23:27:50 +0200 (CEST); the ceramic... but you're ahead of me, aren't you? I have a funny feeling this "modification" is going to be OK :-)< Then that's a beer you owe me - one for each turn!!!!! 73 Peter G3RZP ____________; /archives//html/Amps/2006-10/msg00076.html (8,447 bytes)
318. Re: [Amps] New FCC Amplifier Rule (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 15 Oct 2006 11:20:08 +0200 (CEST); business two-way below 30MHz requiring Morse that I am aware of. Only amateur. < This is correct. A lot of HF R/T below 30MHz is (and always has been) carried out by ops who con't read Morse. 73 Pete; /archives//html/Amps/2006-10/msg00135.html (8,225 bytes)
319. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 16 Oct 2006 10:01:08 +0200 (CEST); the peak output to be linear ... < Not necessarily, if it has the right metering. Provided the metering can look at the relative phase and amplitude of anode and input volts, the amp can be tuned cor; /archives//html/Amps/2006-10/msg00159.html (8,845 bytes)
320. Re: [Amps] PEP power.. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 16 Oct 2006 10:09:31 +0200 (CEST); Actually, the definition of PEP quoted by SM2EKM is the definition in ITU-R Recommendation SM328. That definition has been around since the 1950's. 73 Peter G3RZP ____________________________________; /archives//html/Amps/2006-10/msg00160.html (6,635 bytes)

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