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References: [ +from:g3rzp@g3rzp.wanadoo.co.uk: 523 ]

Total 523 documents matching your query.

341. [Amps] GM3SEK (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 18 Dec 2006 11:43:57 +0100 (CET)
Anybody wanting Ian on email will have to wait - he won't be around until Thursday - his telephone line and thus internet access are down - they say it will be back Thursday. He's a bit like me in th
/archives//html/Amps/2006-12/msg00132.html (6,515 bytes)

342. [Amps] QST, diodes and equalising resistors (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 19 Dec 2006 09:50:36 +0100 (CET)
Tom, W8JI, commented on the suggestion in the QST article (which I haven't seen yet) of using small 470k resistors across the diodes. I seem to remember having this discussion previously, and having
/archives//html/Amps/2006-12/msg00163.html (8,249 bytes)

343. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 21 Dec 2006 08:13:24 +0100 (CET)
hotspotting, because in the AB class it would run at very low voltage (20 or 30V at most) and above that it would be running class F. At the same time, the reduced dissipation goes a long way in help
/archives//html/Amps/2006-12/msg00187.html (7,843 bytes)

344. Re: [Amps] Pi-L Tank on TenTec Titan 425 (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 22 Dec 2006 10:28:49 +0100 (CET)
with a large L between the tube and the network input capacitor.< Use Nichrome ? :)- 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2006-12/msg00199.html (7,643 bytes)

345. Re: [Amps] Alpha 87a (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 2 Jan 2007 10:43:06 +0100 (CET)
Pappenfus et al write about the length of cable adding to the input tuning such as to make a complete number of electrical half waves back to the plate of the driver tube: the tube acting as a consta
/archives//html/Amps/2007-01/msg00016.html (8,021 bytes)

346. Re: [Amps] lots of 813's and 872a's (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 2 Jan 2007 10:44:50 +0100 (CET)
872s are fairly large mercury vapour rectifiers. Not too much demand for them these days......except from restorers. You might well find that they sell well on ebay. 73 Peter G3RZP __________________
/archives//html/Amps/2007-01/msg00017.html (6,685 bytes)

347. Re: [Amps] Alpha 87a (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 2 Jan 2007 13:07:35 +0100 (CET)
Well, I only quote the man. Regrettably, he is SK, so we can't ask him............ However, depending on the class of operation of the amplifier, there will a greater or lesser degree of harmonic ene
/archives//html/Amps/2007-01/msg00019.html (8,544 bytes)

348. Re: [Amps] *** SPAM *** Re: Alpha 87a (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 2 Jan 2007 17:44:25 +0100 (CET)
shield can't change SWR inside the cable < This is very true: however, what they can do is to change the indicated SWR, depending on the SWR meter. So you can have a cable that in reality has a 1:1 S
/archives//html/Amps/2007-01/msg00026.html (7,122 bytes)

349. Re: [Amps] *** SPAM *** Re: Alpha 87a (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 3 Jan 2007 10:27:36 +0100 (CET)
transmitter, the ATU or a dummy load has a substantial break in its shielding. Without any of those, the indicated SWR is not affected by common-mode currents on the outside surfaces.< I have found t
/archives//html/Amps/2007-01/msg00036.html (8,618 bytes)

350. Re: [Amps] Ferrite Rod (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 3 Jan 2007 14:36:20 +0100 (CET)
reason being nothing cancels magnetizing flux caused by the many ampere turns of the single winding and the core often saturates. The result is at best a loss of RF choke impedance at the filament, a
/archives//html/Amps/2007-01/msg00041.html (9,523 bytes)

351. Re: [Amps] schamatis 160 meter amp using 3cx3000a7 (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 12 Jan 2007 15:52:46 +0100 (CET)
What do you mean by "160m amp using the 3x3 "? What is a "3x3"? 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2007-01/msg00090.html (6,972 bytes)

352. Re: [Amps] RK65/5D23 tetrode (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 13 Jan 2007 06:53:05 +0100 (CET)
RK65 Plate dissipation 215 watts, filament 5volts 14 amps, max plate volts 3000, max screen volts 500, max screen dissipation 35 watts, grid to fil capacity 10.5pF, grid to plate capacity 0.24pF, ol
/archives//html/Amps/2007-01/msg00113.html (8,271 bytes)

353. Re: [Amps] What am I missing? (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 13 Jan 2007 06:56:29 +0100 (CET)
I have the one that advcoates the strapping of grids. It's actually a reprint of a three part article that W6SAI did in Ham Radio magazine. 73 Peter G3RZP ____________________________________________
/archives//html/Amps/2007-01/msg00114.html (7,320 bytes)

354. Re: [Amps]RE : Interesting Item........................... (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 13 Jan 2007 15:30:45 +0100 (CET)
That style amplifer was designed at Moarconi in the late 1950's/early 1960s as part of the MST (Marconi Self Tuning ) range. There was a 1kW HF version with 16 4CX250Bs in two push pull distibuted am
/archives//html/Amps/2007-01/msg00122.html (9,171 bytes)

355. Re: [Amps] What am I missing? (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 13 Jan 2007 20:59:30 +0100 (CET)
IF you chase me next month (after I'm back from a business trip to the US and the XYL is back from her business trip to the US - she's in Portland Or at the moment ), I'll dig it out and get her to s
/archives//html/Amps/2007-01/msg00127.html (7,996 bytes)

356. [Amps] BAMA - somewhat OT (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 14 Jan 2007 14:33:39 +0100 (CET)
Anyone know what's happened to the BAMA site? I can't download anything from it - just get an error message saying internet explorer can't open it. 73 Peter G3RZP ____________________________________
/archives//html/Amps/2007-01/msg00133.html (6,494 bytes)

357. Re: [Amps] BAMA - somewhat OT (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 14 Jan 2007 17:05:44 +0100 (CET)
So I tried http://bama.edebris.com/manuals/ and got: Gateway Timeout The following error occurred: [code=DNS_TIMEOUT] A DNS lookup error occurred because the request timed out during the lookup. 73 P
/archives//html/Amps/2007-01/msg00138.html (7,694 bytes)

358. Re: [Amps] BAMA - somewhat OT (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 14 Jan 2007 18:22:38 +0100 (CET)
Ah! If I type the address in , it works. If I just click on the address and attempt to get there straight from amps message, it doesn't. And they say RF is black magic!! Tnx, guys. 73 Peter G3RZP ___
/archives//html/Amps/2007-01/msg00143.html (7,627 bytes)

359. Re: [Amps] 3-500Z filament desoldering - sequel (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 23 Jan 2007 17:45:51 +0100 (CET)
I think another factor is the amount (or otherwise!) of cooling air over the filament pins. Other tubes using that filament (5v, 14.1A) have requirements for the amount of cooling air over those pins
/archives//html/Amps/2007-01/msg00232.html (7,230 bytes)

360. Re: [Amps] 813 Filament Transformer (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 24 Jan 2007 17:35:56 +0100 (CET)
Another possibility is to use the 13 volt transformer with a 25 ohm, 30 watt resistor in the primary. You might want to make it an adjustable resistor, but it would have the additional advantage that
/archives//html/Amps/2007-01/msg00246.html (7,390 bytes)

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