Mail Archive Search: <+from:G3SEK@ifwtech.demon.co.uk>

Results:

References: [ +from:G3SEK@ifwtech.demon.co.uk: 419 ]

Total 419 documents matching your query.

201. [AMPS] HV Connectors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 17 Jan 1999 20:35:58 +0000; According to the Radiall catalog, MHV (aka BNC-HT) are rated to 5kV unmated or 7kV mated - which might be marginal for some AMPS users. Current rating is 5A. SHV are rated at 10/12kV and 10 amps. The; /archives//html/Amps/1999-01/msg00236.html (8,689 bytes)
202. [AMPS] HV Connectors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 18 Jan 1999 08:13:24 +0000; Yup, same cable - but are you absolutely certain that 1900/2300V are DC ratings? I'm looking here at a catalog that says 2.3kV peak RF, but also 15kV DC. Similar ratios apply for other cables. RG58 i; /archives//html/Amps/1999-01/msg00245.html (8,734 bytes)
203. [AMPS] Adjusting fil voltage (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 Jan 1999 14:21:21 +0000; Normally the rheostat will be set wherever it was last time (unless somebody has been messing with it). If the resistance is large enough, it wouldn't need any more inrush protection. I'm using a 100; /archives//html/Amps/1999-01/msg00278.html (8,814 bytes)
204. [AMPS] 7/16 din (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 24 Jan 1999 10:55:27 +0000; Modern 7/16 DIN connectors are exactly as easy to install as N or any other format, because they all use the same back-end assembly to connect to the hardline. All the competing companies now have "e; /archives//html/Amps/1999-01/msg00358.html (8,576 bytes)
205. [AMPS] Henry 8K at 1500 watts Out -- Warning Long (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 8 Dec 1998 22:16:28 +0000; [...] Another way of looking at it is that the purpose of the tank circuit is to create a load line for the tube. It does that by transforming the 50 ohm load impedance "backwards" up to typically a; /archives//html/Amps/1998-12/msg00144.html (9,640 bytes)
206. [AMPS] Henry 8K at 1500 watts Out -- Warning Long (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 9 Dec 1998 07:57:37 +0000; When you tune-up the PA for maximum RF output, you're presenting the tube with a load line that optimizes the efficiency. When you change the drive level and re-tune for max, you're RE-optimizing it.; /archives//html/Amps/1998-12/msg00157.html (9,612 bytes)
207. [AMPS] HV Capacitors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 11 Dec 1998 07:07:04 +0000; It seems to be a case of choosing a high DC voltage rating, and hoping that the RF voltage and current ratings (two different things) will both be OK. Just wear earplugs for the first six months? Mor; /archives//html/Amps/1998-12/msg00191.html (8,212 bytes)
208. [AMPS] tuning capacitor & insulator (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 17 Dec 1998 18:58:16 +0000; The gain is right - and by goodness the price is certainly right - but expect no more than 500W PEP of *linear* SSB. Otherwise expect to lose a lot of friends. No criticism of Rich's particular desig; /archives//html/Amps/1998-12/msg00248.html (9,230 bytes)
209. [AMPS] tuning capacitor & insulator (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 18 Dec 1998 09:07:20 +0000; Certainly you can get the raw power out - but it is impossible to tell what the IMD levels will be by eyeballing a constant current curve. Even a 1% deviation from a straight line makes a lot of IMD.; /archives//html/Amps/1998-12/msg00256.html (11,533 bytes)
210. [AMPS] tuning capacitor & insulator (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 20 Dec 1998 09:30:35 +0000; That is one of the problems with the "typical" data sheet operating conditions - all the important parameters tend to change together: anode voltage, screen voltage, ZSAC (and therefore grid bias), R; /archives//html/Amps/1998-12/msg00298.html (10,444 bytes)
211. [AMPS] WTB 4kV+ block paper smoothing cap (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 21 Dec 1998 13:42:13 +0000; Looking for a block paper smoothing cap, 25-35uF, rated at least 4kV. If it's a "P" rating (ie originally designed for photoflash) then make that at least 6kV. Please e-mail with ratings, price and d; /archives//html/Amps/1998-12/msg00314.html (7,120 bytes)
212. [AMPS] 432 Mhz Amp Plus new tube (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 21 Dec 1998 13:35:55 +0000; If you can get the tube, by far the best "bang for the buck" is the GS35b amp on DL4MEA's web pages (search for his callsign, you'll find it). Otherwise, see K1FO's designs for one or two 3CX800s or; /archives//html/Amps/1998-12/msg00315.html (7,876 bytes)
213. [AMPS] Line input wiring (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 26 Dec 1998 12:33:22 +0000; In European wiring practice the neutral return is an insulated wire or busbar, and ALL the sheet metalwork is bonded together and connected to the separate "earth" conductor. Electrically there is no; /archives//html/Amps/1998-12/msg00417.html (11,366 bytes)
214. SV: [AMPS] Re: SV: G2DAF (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 1 Nov 1998 10:31:05 +0000; Yes, please send me a copy, Lars. Can you also say what tube, what anode voltage, and how the screen voltage was generated (voltage doubler/tripler? solid-state rectifiers or vacuum tubes? Value of D; /archives//html/Amps/1998-11/msg00017.html (9,937 bytes)
215. [AMPS] G2DAF (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 3 Nov 1998 07:56:33 +0000; The problem with any two or three fixed tones is that the test signal doesn't explore all possible weaknesses of the power supplies. Although it's an improvement to add a third, lower tone which modu; /archives//html/Amps/1998-11/msg00054.html (10,234 bytes)
216. [AMPS] reduction drives (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Nov 1998 22:05:48 +0000; Jackson Bros won't deal in small quantities, but a UK firm called Electrovalue will. Their May 1997 price for the 4489/C was £13.60 + 17.5% tax + postage. Try evalue@compuserve.com, or maybe th; /archives//html/Amps/1998-11/msg00118.html (7,928 bytes)
217. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 15 Nov 1998 22:39:00 +0000; Note that the necessary breakdown voltage foir a shunt stabilizer device is not the output voltage, but the INPUT voltage, to handle transient situations where the device is completely cut off and th; /archives//html/Amps/1998-11/msg00213.html (12,016 bytes)
218. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 16 Nov 1998 13:52:03 +0000; Don't forget the transient conditions - like, how do you switch it on? Before the feedback loop stabilizes, the shunt device is drawing zero cirrent and is exposed to the full unregulated voltage (al; /archives//html/Amps/1998-11/msg00229.html (13,489 bytes)
219. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Nov 1998 15:00:25 +0000; Sorry, I'm not making myself clear. I *did* assume that there is a screen bleeder resistor. My point was that it does not necessarily prevent this scenario, unless the value has been carefully select; /archives//html/Amps/1998-11/msg00244.html (12,461 bytes)
220. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Nov 1998 22:55:38 +0000; If it's in some kind of feedback circuit the impedance could be very low. The same is true of a shunt regulator, eg something using an 807 or a similar smallish transmitting tube, if you use somethin; /archives//html/Amps/1998-11/msg00246.html (11,442 bytes)

Current List: 201 - 220
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]