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21. Re: [Amps] Asynchronous coax matching transformer (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 31 Jul 2009 20:42:32 -0400; Try Google for "1/6 wave transformer:" http://www.k1ttt.net/technote/matching.html 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2009-07/msg00456.html (7,781 bytes)
22. Re: [Amps] Asynchronous coax matching transformer (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 1 Aug 2009 16:35:15 -0400; It depends on the type of connector. UHF connectors are often closer to 35 Ohms if I recall correctly. N connectors can be either 50 or 75 Ohms ... if using a barrel for splicing, it is probably bet; /archives//html/Amps/2009-08/msg00010.html (14,164 bytes)
23. Re: [Amps] Subject: grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 3 Aug 2009 01:45:44 -0400; No, we were talking about the SB-220 and the RF choke has such a high value (1 mH) that it is an open circuit compared to the capacitors. 73, ... Joe, W4TV __________________________________________; /archives//html/Amps/2009-08/msg00045.html (10,835 bytes)
24. Re: [Amps] Tube gain vs frequency (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 27 Aug 2009 17:37:12 -0400; Add to the list the Klystrode (r) or Inductive Output Tube (IOT) and the Diacrode. There may be other devices that combine multiple technologies - like the multi stage depressed collector IOT (MSDC; /archives//html/Amps/2009-08/msg00556.html (9,364 bytes)
25. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 11:33:35 -0400; No. The SB-220 will not survive RTTY operation in "full smoke" mode. 100% duty cycle at 1500 W output will cook both the transformer and the output. Running at lower power keeps the transformer and; /archives//html/Amps/2009-08/msg00600.html (12,692 bytes)
26. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 18:02:32 -0400; No, I didn't miss the point. Running an amplifier in a mis-tuned condition (tune for 1500 W Output and drive to 800 W Out) is hazardous and inefficient. If you tune the amplifier for 800 W at the hi; /archives//html/Amps/2009-08/msg00611.html (16,600 bytes)
27. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 18:02:32 -0400; Absolutely "way" ... if you run the higher late voltage with lower current and only 700 - 800 watts out in RTTY, the plate load impedance of the tubes will be two to three times higher that the desi; /archives//html/Amps/2009-08/msg00612.html (11,211 bytes)
28. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 20:48:51 -0400; Reducing the power output without changing the plate voltage will result in a miss-tuned condition. If the pi-network is tuned for full output and the drive reduced (power adjusted). If the output i; /archives//html/Amps/2009-08/msg00618.html (9,666 bytes)
29. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 20:48:51 -0400; The higher circulating currents will very likely cause the pi-network coil or bandswitch to fail. But then the failure will probably be blamed on a parasitic rather than misuse. ____________________; /archives//html/Amps/2009-08/msg00619.html (10,083 bytes)
30. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 20:48:51 -0400; Not that it matters but you want Ep and Ip to go to 70% each in order to reach half power (.7x.7= .5). By keeping them in the same ratio, the plate load impedance remains the same. If Ep and Ip sent; /archives//html/Amps/2009-08/msg00620.html (15,283 bytes)
31. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 29 Aug 2009 21:30:02 -0400; No, I'm saying they are all designed to operate at 1500 Watts output. If one reduces power without reducing the plate voltage appropriately, the plate load impedance will change. Unless the "L" in t; /archives//html/Amps/2009-08/msg00626.html (10,020 bytes)
32. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 30 Aug 2009 00:17:43 -0400; No ... with SSB the plate load impedance is dynamic as opposed to static (a single value) with CW or RTTY. For SSB or any other amplitude modulated emission, the calculation of plate load impedance; /archives//html/Amps/2009-08/msg00627.html (10,154 bytes)
33. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 30 Aug 2009 10:12:31 -0400; Again, you did not read what I wrote ... If you change the network by changing the plate load impedance as you do when you run 1000 watts in the high voltage position the VALUES of the capacitors mu; /archives//html/Amps/2009-08/msg00633.html (11,575 bytes)
34. Re: [Amps] Loaded output circuits (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 31 Aug 2009 01:20:34 -0400; Bill, stop changing the question to suit your point of view. The original question was about operating at the lower output power level with the higher plate voltage. The only person who ever said an; /archives//html/Amps/2009-08/msg00653.html (10,176 bytes)
35. Re: [Amps] SB-220 bias question (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 31 Aug 2009 01:20:34 -0400; If you don't retune the output network when operating in a continuous power mode (CW or RTTY) at a lower power level, the loading will be incorrect. Linearity may or may not suffer, efficiency will; /archives//html/Amps/2009-08/msg00654.html (10,710 bytes)
36. Re: [Amps] Pair of SB-220s (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 6 Sep 2009 15:55:10 -0400; Yes, they use two ALS-600 boards with splitters in the input and combiners on the output. However, instead of Wilkinson combiner/splitters Ameritron is using broadband devices. The ALS-1300 manual (; /archives//html/Amps/2009-09/msg00065.html (11,228 bytes)
37. Re: [Amps] Suggestion..... (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 3 Oct 2009 13:55:47 -0400; No, leave it alone. "Reply to sender" is the default for the MailMan list software and goes a long way to preventing the "oops!" of an accidental "reply to all." Most e-mail software includes both "r; /archives//html/Amps/2009-10/msg00043.html (8,007 bytes)
38. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 5 Oct 2009 00:26:35 -0400; Based on the schematic of the amplifier, the PO function is not a wattmeter but a simple capacitive voltage divider and rectifier on the RF output. A circuit like that has no directivity and is easil; /archives//html/Amps/2009-10/msg00076.html (12,231 bytes)
39. Re: [Amps] Advice (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 6 Dec 2009 00:40:46 -0500; The current Eimac data sheet gives the cooling requirements at sea level as: Anode CFM Pressure Diss In. Water -- 400 6 0.09 600 11 0.20 800 19 0.50 However, the original (1983) Eimac data sheet for; /archives//html/Amps/2009-12/msg00151.html (18,197 bytes)
40. Re: [Amps] Ameritron ALS-1300 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 7 Dec 2009 20:11:01 -0500; Like the ALS-600, the amplifier modules are based on the proven design by Helge Granberg in Motorola Engineering Bulletin 104: www.communication-concepts.com/appnotes/EB104Sharp300.pdf. 73, ... Joe,; /archives//html/Amps/2009-12/msg00213.html (9,648 bytes)

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