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1. [AMPS] Plate load charts (score: 1): Author: Jim" <jdc@ieway.com (Jim); Date: Mon, 4 Jan 1999 23:08:58 -0800; This is a multi-part message in MIME format. --=_NextPart_000_0009_01BE3837.35BD2EA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable "Have you ever noticed"; /archives//html/Amps/1999-01/msg00065.html (13,449 bytes)
2. [AMPS] Plate load charts (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 5 Jan 1999 01:40:40 -0800; RL depends somewhat on the conduction angle which is a function of ZSAC (zero signal anode current). Less ZSAC results in a lower conduction angle, and less K. More ZSAC makes for a higher conductio; /archives//html/Amps/1999-01/msg00066.html (10,097 bytes)
3. [AMPS] Plate load charts (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 5 Jan 1999 10:53:48 -0000; Maybe I take too simplistic a view. I figure as follows:- When the tube is drawing the peak plate current (i.e. at the peak of the rf cycle), the plate voltage should be at its minimum value. So the; /archives//html/Amps/1999-01/msg00067.html (9,151 bytes)
4. [AMPS] Plate load charts (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 5 Jan 1999 03:10:26 -0800; ? Indeed, and the result seems to work well enough. - cheers, Peter. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissio; /archives//html/Amps/1999-01/msg00068.html (8,544 bytes)
5. [AMPS] Plate load charts (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 5 Jan 1999 13:06:48 -0000; ? In any event, reducing RF resistance in L1 improves tank efficiency. Get this in perspective. If you have a 4CX1000 with 2000 volts plate swing (Peak, not peak to peak) and a 2000ohm plate load wit; /archives//html/Amps/1999-01/msg00069.html (9,564 bytes)
6. [AMPS] Plate load charts (score: 1): Author: yo3ctk@qsl.net (yo3ctk@qsl.net); Date: Tue, 5 Jan 1999 08:23:16 -0500; I'd like to add a correction to otherwise pertinent comments of Peter: Ten amps is the PEAK value of current and therefore it's not correct to calculate dissipation based upon this value. It can be d; /archives//html/Amps/1999-01/msg00070.html (9,561 bytes)
7. [AMPS] Plate load charts (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 5 Jan 1999 13:41:29 -0000; Whoops! Sorry, Mike is correct. 10amps pk is 7 amps rms so the losses are 87 watts. Still substantial. I'm seriously considering silver soldering the taps on the tank coil - that's with solder meltin; /archives//html/Amps/1999-01/msg00071.html (8,760 bytes)
8. [AMPS] Plate load charts (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 5 Jan 1999 07:13:01 -0800; ? If one is using a pressurized chassis, by drilling a grid of small holes in the chassis underneath L1, an updraft is created which cools the coil. Thus, one can use 6% Ag, 94% Sn solder (eutectic; /archives//html/Amps/1999-01/msg00072.html (9,356 bytes)
9. [AMPS] Plate load charts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 5 Jan 1999 15:25:13 +0000; There are various methods for calculating the Pi and Pi-L network values, some more approximate than others. As has been pointed out already, approximate methods are actually OK for this application.; /archives//html/Amps/1999-01/msg00073.html (12,396 bytes)
10. [AMPS] Plate load charts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 5 Jan 1999 18:54:30 +0000; Well, there's always the old VHF/UHF trick of pressurizing the whole output compartment. Cold air circulates all around the tank circuit and the lower part of the tube, and then flows out through the; /archives//html/Amps/1999-01/msg00075.html (10,111 bytes)
11. [AMPS] Plate load charts (score: 1): Author: johnf@futurenet.co.za (John Fielding); Date: Wed, 6 Jan 1999 07:16:54 +0200; Amplifier" a tank inductor with a Q of less than 400 doesn't warrant using!!!! Measured using a Marconi Q meter I found that a Q of 600 and above is practical with normal aspect coils. The position; /archives//html/Amps/1999-01/msg00077.html (11,669 bytes)
12. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 5 Jan 1999 12:04:29 -0500; The SB-220 is a poor example to use for efficiency but it speaks volumes if this discussion wants to get into total network design, component selection and not just the tank coil. At 2KW input the av; /archives//html/Amps/1999-01/msg00080.html (11,273 bytes)
13. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 5 Jan 1999 11:50:37 -0500; Far from a new discussion, in fact it was discussed at length about a month or two ago. Check the archives for some backround. As far as efficiency is concerned I suspect that you are only partially; /archives//html/Amps/1999-01/msg00081.html (12,590 bytes)
14. [AMPS] Plate load charts (score: 1): Author: K3BU@aol.com (K3BU@aol.com); Date: Wed, 6 Jan 1999 12:50:39 EST; << At 2KW input the average SB-220 will crank out a massive 900-1000W on 10M for 45-50% efficiency. OTOH, with all that HF stuff removed and rebuilt strictly for 6M the power out will be 60-65% effic; /archives//html/Amps/1999-01/msg00083.html (10,006 bytes)
15. [AMPS] Plate load charts (score: 1): Author: n4kg@juno.com (T A RUSSELL); Date: Thu, 7 Jan 1999 06:38:31 -0600; Re: SB-220 on 10 M. K4AB damaged the bandswitch before the 10M contest so he bypassed the bandswitch, wiring the SB-220 tank circuit directly for 10M. Output went from the usual 900W to 1200 W. Wonde; /archives//html/Amps/1999-01/msg00087.html (9,284 bytes)
16. [AMPS] Plate load charts (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 7 Jan 1999 03:56:41 -0800; ? Did he damage the bandswitch through error? ? Tom: Could the SB-220's bandswitch have been dissipating 300w on 10m? - later Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FA; /archives//html/Amps/1999-01/msg00088.html (9,281 bytes)
17. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 11:09:46 -0500; Yeah, Heathkits....not voodoo. Exactly the point I was trying to make yesterday. It is not the SB-220 tank coil that is at fault since I use the same 10M coil on 6M and it works just fine at 60+ % ef; /archives//html/Amps/1999-01/msg00093.html (12,452 bytes)
18. [AMPS] Plate load charts (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 7 Jan 1999 16:19:20 -0000; I'd be a bit suspicious of these high values of Q off a Marconi Q meter. I have found incredible differences between TF1245 Q meters with the same inductor when you get above Qs of around 200. If yo; /archives//html/Amps/1999-01/msg00094.html (9,996 bytes)
19. Fw: [AMPS] Plate load charts (score: 1): Author: Jim" <jdc@ieway.com (Jim); Date: Thu, 7 Jan 1999 08:54:19 -0800; To: <amps@contesting.com> the switch 3-500Z. -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner; /archives//html/Amps/1999-01/msg00096.html (11,068 bytes)
20. [AMPS] Plate load charts (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 7 Jan 1999 10:18:16 -0800; Barring spilt coffee, the withstanding potential of the Heath SB-220 bandswitch is slightly over 5000v. On the SSB tap, tank piv is c. 2600v. With deliberate mistuning, the tank piv has been measure; /archives//html/Amps/1999-01/msg00098.html (11,784 bytes)

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