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201. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Mon, 07 Nov 2005 23:17:21 +0000
as in the weasel, - push pull with a U-shaped anode line. I can't recall if there was one at all. I had no desire to waste power -- David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if yo
/archives//html/Amps/2005-11/msg00104.html (8,278 bytes)

202. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Tue, 08 Nov 2005 11:59:29 +0000
Conrad, I am copying this to amps, as you appeared to have intended it going there. If I recall correctly the W1SL amp was published by a ham who later got the call sign W1SL, but at the time it was
/archives//html/Amps/2005-11/msg00112.html (10,531 bytes)

203. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Tue, 08 Nov 2005 12:09:02 +0000
Well the two 4CX250B amp worked very well. IT was known to be one of the best 2m designs. The size of the crossover flapper caps needed to be reduced (in fact it was stable without them). I gather th
/archives//html/Amps/2005-11/msg00113.html (10,272 bytes)

204. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Tue, 08 Nov 2005 13:07:23 +0000
The gain on mine was high. Drive was around 1W for 600W out in AB1. But it never had a problem. I used to get serious TVI issues, which resulted in a visit from the post office. They checked the amp
/archives//html/Amps/2005-11/msg00115.html (10,315 bytes)

205. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Tue, 08 Nov 2005 17:16:18 +0000
If the tube is off (as it was when this was done), and there are no magnetic devices like isolators, I don't see what difference it would make. The system would be a reciprocal two-port so you should
/archives//html/Amps/2005-11/msg00121.html (10,074 bytes)

206. Re: [Amps] Ouch - 23 Ohms ? (score: 1)
Author: David Kirkby <david.kirkby@onetel.net>
Date: Sun, 11 Dec 2005 02:12:49 +0000
Are you saying these couplers have a design impedance of 23 Ohms, or are you measuring 23 Ohms with a DVM or something? If they are a transmission line of 23 Ohms inserted in a line of 50 Ohms, they
/archives//html/Amps/2005-12/msg00115.html (7,853 bytes)

207. Re: [Amps] Ouch - 23 Ohms ? (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 11 Dec 2005 18:22:32 +0000
With what? DVM, MJF whatever, network analyser? I'm just lost. What impedance is 22 Ohms? If the coupled ports are not properly temperminated (whatever properly means in this case) then the results w
/archives//html/Amps/2005-12/msg00122.html (7,583 bytes)

208. Re: [Amps] Ouch - 23 Ohms ? (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 11 Dec 2005 21:10:21 +0000
That is clearly a special. You might find Minicircuits will tell you - perhaps if you phone rather than email. I have sometimes got companies to tell me about specials, but on other occasions they wi
/archives//html/Amps/2005-12/msg00126.html (9,777 bytes)

209. [Amps] Software for noise figure meters. (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 26 Dec 2005 23:14:31 +0000
A bit off-topic, but perhaps of use to some here. -- I finally got around to posting the software I wrote to control an HP 8970A noise figure meter. I should work with the 8970B too, with the excepti
/archives//html/Amps/2005-12/msg00341.html (8,536 bytes)

210. Re: [Amps] Calibrate a panel meter? (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Wed, 28 Dec 2005 18:54:40 +0000
I'm not aware of being able to calibrate them, but if you don't mind making your own scale, you can avoid that. With a graphics package you can add your own scales, but green, yellow and red areas fo
/archives//html/Amps/2005-12/msg00359.html (7,632 bytes)

211. Re: [Amps] SHV Connectors & Coax (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 02 Jan 2006 23:49:56 +0000
Huber and Shuner used to make SHV connectors. The company was renamed some time back I think, but can't recall what it is called now. They actually make them - not just sell them. The cable can poten
/archives//html/Amps/2006-01/msg00109.html (8,217 bytes)

212. Re: [Amps] SHV Connectors & Coax (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 03 Jan 2006 00:40:47 +0000
Especially in this case, as there is a safety issue. You really do want to get the right coax. Yes, I never could remember the exact spelling. I somehow thought they were renamed, but I must be think
/archives//html/Amps/2006-01/msg00114.html (8,090 bytes)

213. Re: [Amps] SHV Connectors & Coax (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 03 Jan 2006 00:47:03 +0000
Sorry, my comment did sound rather patronising. It was not meant to be like that - just emphasising that you need to check the facts very carefully before selecting the cable, and that nobody will kn
/archives//html/Amps/2006-01/msg00115.html (7,941 bytes)

214. Re: [Amps] Effects of load Z mismatch? (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 09 Jan 2006 18:43:01 +0000
There is the "maximum power transfer theorem" which you can google on. For a DC circuit, it is easy to show the load impedance must be the same as the source impedance. See for example http://www.all
/archives//html/Amps/2006-01/msg00291.html (7,697 bytes)

215. Re: [Amps] Meter Res. (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 10 Jan 2006 20:54:21 +0000
Two possible solutions 1) Resistors in the E96 range are farily easy to come by (RS in the UK is one example). There you can get 4.99 M Ohm as a standard value. See http://industrial.panasonic.com/ww
/archives//html/Amps/2006-01/msg00326.html (7,241 bytes)

216. Re: [Amps] What blower? (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Fri, 27 Jan 2006 23:19:33 +0000
Hi, You are approaching this the wrong way. You should first get the data sheet on the tube and see what airflow it needs and what back pressue will be developed at that flow. Then you look at the fa
/archives//html/Amps/2006-01/msg00630.html (7,853 bytes)

217. Re: [Amps] Tokyo HP (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Fri, 17 Feb 2006 14:44:30 +0000
I don't know if this applies to radio kit, but last week I exported a CPU to the US from the UK. I had to fill in an FCC form for Fedex. In the case of the CPU it was exempt from regulations, since w
/archives//html/Amps/2006-02/msg00309.html (8,533 bytes)

218. Re: [Amps] Speaking of PIN T/R switches (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 06 Mar 2006 22:50:33 +0000
I'm not sure if you will be able to use PIN diodes at such a low frequency. The carrier lifetime may be too short. It is not a subject I know well, so stand to be corrected. _________________________
/archives//html/Amps/2006-03/msg00136.html (7,989 bytes)

219. Re: [Amps] bird watts (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 07 Mar 2006 15:49:17 +0000
Don't worship the Bird. The Bird 43's I was testing twenty years ago were rarely within 5% of FSD. Most were within 10% of FSD, but still a significant fraction were outside of that. (These measureme
/archives//html/Amps/2006-03/msg00167.html (8,359 bytes)

220. Re: [Amps] tube cooling requirements (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Fri, 17 Mar 2006 13:21:38 +0000
Just the flow rate - not the pressure. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-03/msg00488.html (7,630 bytes)

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