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1. Re: [Amps] SB-220 Drive Levels (score: 1): Author: Bob Alexander <realex@flash.net>; Date: Thu, 22 Jan 2009 19:28:44 -0600; 1200 Watts out is about the max an SB220 will do. One should remember the amp was built at a time when 1000 W DC input was the legal limit and all instructions in the manual reflect this limit. On 20; /archives//html/Amps/2009-01/msg00256.html (8,254 bytes)
2. Re: [Amps] 8877 blower requirement ? (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Fri, 6 Apr 2007 07:39:02 -0600; Howdy, I did some research on the w6po amp. I assumed it was a 1500 W output amp not a 1KW input amp. Big difference. At 1 KW input and dissipation on the order of 500-600 watts the 4C440 blower shou; /archives//html/Amps/2007-04/msg00019.html (11,615 bytes)
3. Re: [Amps] 8877 blower requirement ? (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Thu, 5 Apr 2007 10:10:51 -0600; Hugh, The 4C440 only has 60 CFM at 0 static pressure... an 8877 needs around 40 cfm at .6" SP. and the 4c440 does not meet this spec. I do not know the specs on the 2C610 but it is probably around 70; /archives//html/Amps/2007-04/msg00012.html (8,806 bytes)
4. Re: [Amps] History of AMPS (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Tue, 14 Nov 2006 08:59:00 -0600; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-11/msg00164.html (7,043 bytes)
5. Re: [Amps] Need some info from the SB-220 schematic, please! (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Thu, 19 Oct 2006 15:58:45 -0500; Tom, I have a SB220 manual dated 11-28-69 and the pinouts for the relay match George's, as do the wiring instructions. I also have a photocopy of a schematic that matches your pinouts. Is there reall; /archives//html/Amps/2006-10/msg00205.html (7,454 bytes)
6. Re: [Amps] SB-220 Mod for GS-35b (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Sun, 5 Feb 2006 06:01:38 -0600; Hi John, I will admit at the start that I am not familiar with the GS-35B. However, if it requires a pressurized chassis/air system socket assembly for cooling, a complete replacement/ rebuild of the; /archives//html/Amps/2006-02/msg00102.html (7,836 bytes)
7. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Tue, 22 Nov 2005 09:57:29 -0600; Hi Dan, After re-reading my description of the coupler I realized I was a bit careless. So, to revise part of my description: There are some problems with the schematic drawings found in the ARRL boo; /archives//html/Amps/2005-11/msg00439.html (12,945 bytes)
8. RE: [Amps] 10 DB increase (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Sat, 5 Feb 2005 07:36:49 -0600; I went back to the archive to find the original question. S-meters do not measure received signal level accurately because they do not measure the signal but rather the level of the AGC voltage requi; /archives//html/Amps/2005-02/msg00142.html (8,720 bytes)
9. RE: [Amps] PCB Trace width for 1500 watts RF? (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Fri, 28 Jan 2005 19:07:56 -0600; Dan, With 1500W into a 2.5:1 mismatch the maximum current will be 8.66A @173.2 Volts when the load is 20 ohms +/- j0. Maximum voltage is 433 @ 3.46A when the load is 125 ohms +/-j0. If the line is te; /archives//html/Amps/2005-01/msg00551.html (7,840 bytes)
10. RE: [Amps] Hf Combiners and SPlitters (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Wed, 17 Nov 2004 05:29:23 -0600; Check out page 10 of "Antenna Compendum" volume 2 Bob, W5AH I am trying to find formulas for a Hybrid style combiner that seems to be a 4 port Tee style splitter/combiner. It would resemble most form; /archives//html/Amps/2004-11/msg00245.html (7,769 bytes)
11. [Amps] Re: Need help with HB 8877 project (score: 1): Author: realex@flash.net (realex); Date: Thu, 2 Jan 2003 14:29:22 -0600; Im not sure the B&W 852 can handle the power levels you are designing for. I believe a coil made from 1/4" copper tubing would be a better choice. 73, GL Bob, W5AH ___________________________________; /archives//html/Amps/2003-01/msg00014.html (8,600 bytes)
12. [Amps] Bird 1000H slug adjustment? (score: 1): Author: realex@flash.net (realex); Date: Sun, 27 Oct 2002 05:53:10 -0600; Howdy, Sounds to me like you have a 2500 Watt slug that is mislabeled. 73, Bob, W5AH If it's that far out it might need repairing rather than adjusting. Steve ________________________________________; /archives//html/Amps/2002-10/msg00280.html (8,590 bytes)
13. [Amps] RG-174 power handling capacity (score: 1): Author: realex@flash.net (Bob Alexander); Date: Thu, 4 Apr 2002 06:10:00 -0800; Pete, RG-174 is rated @ 170 Watts @ 10 MHz, 72 Watts @ 50 MHz. Loss is 3.8 dB/100Ft at 10 MHz and 6.5 dB/100Ft at 50 MHz. Capacity is 30.8 pF/ Ft. Bob, W5AH --Original Message-- I need some small-dia; /archives//html/Amps/2002-04/msg00142.html (7,410 bytes)
14. [Amps] W5FD's PI Net program (score: 1): Author: realex@flash.net (Bob Alexander); Date: Sat, 30 Mar 2002 07:00:47 -0800; Restart your computer in DOS mode...do not open a dos window Bob, W5AH I can't get these programs to run in a DOS window under Win 98. Anybody have any tips? Thanks, Michael _________________________; /archives//html/Amps/2002-03/msg00690.html (7,188 bytes)
15. [Amps] SB-220 tuning cap needed (score: 1): Author: realex@flash.net (Bob Alexander); Date: Mon, 25 Mar 2002 06:12:42 -0600; --Original Message-- I do not understand why use of the wider spaced cap would cause anxiety about the bandswitch. Bob, W5AH; /archives//html/Amps/2002-03/msg00566.html (7,742 bytes)
16. [AMPS] Question - Using 3 phase Xfmr on single phase power? (score: 1): Author: realex@flash.net (Bob Alexander); Date: Tue, 13 Nov 2001 20:01:04 -0600; Hi Jerry, If the delta primary is strapped externally for delta configuration, try placing two of the primary windings in parallel and leave the third winding disconnected. I did this on a plasma rea; /archives//html/Amps/2001-11/msg00239.html (9,315 bytes)
17. [AMPS] (score: 1): Author: realex@flash.net (Bob Alexander); Date: Sat, 10 Nov 2001 05:58:04 -0600; Bill, Im trying to figure out where a 600 V 17 mfd cap is used in a MN2700 Bob, W5AH --Original Message-- I was wondering if anyone knows where I could find some replacement capacitors for my Drake M; /archives//html/Amps/2001-11/msg00168.html (6,884 bytes)
18. [AMPS] Harbach SB-220 Fan Noise (score: 1): Author: realex@flash.net (Bob Alexander); Date: Sun, 15 Jul 2001 12:16:50 -0500; Howdy, My SB220 has a 6" dia. 220VAC muffin fan installed with a R.S. 24 VAC transformer used as an autotransformer to adjust the supply voltage to around 180 VAC. The fan has less noise and much mor; /archives//html/Amps/2001-07/msg00172.html (7,153 bytes)
19. [AMPS] Henry 3000D rf deck (score: 1): Author: realex@flash.net (Bob Alexander); Date: Wed, 14 Mar 2001 06:15:34 -0600; Hi Bill, The 3000D does not lend itself well to modification for all band use. The Tube plate capacity is rather high making it very difficult to make it work on 10 Meters. To drive the tube to 1500; /archives//html/Amps/2001-03/msg00129.html (8,393 bytes)
20. [AMPS] SB-220 High input SWR and transceiver fold back (score: 1): Author: realex@flash.net (Bob Alexander); Date: Wed, 21 Feb 2001 17:37:48 -0600; HOwdy, If the amp input SWR is 1.2:1 with the FT847 in the CW mode and has a problem in the SSB mode, I would think there is a problem with the Yaesu ALC and/or SWR monitoring circuit. Input SWR to t; /archives//html/Amps/2001-02/msg00294.html (9,250 bytes)

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