- 41. [AMPS] MLA2500 Problems (score: 1)
- Author: realex@flash.net (bob alexander)
- Date: Thu, 23 Oct 1997 05:54:13 -0500
- Hi Tom, I'm not sure if you measured B+ at the tube plate or at the p/s. Sounds like you might have an open plate choke...in any case, no B+ on the plate. Another possibility is the keying circuit is
- /archives//html/Amps/1997-10/msg00140.html (8,480 bytes)
- 42. [AMPS] conjugate match and amplifiers (score: 1)
- Author: realex@flash.net (Bob Alexander)
- Date: Tue, 09 Sep 1997 20:10:19 -0500
- Tom, Thank you for e-mailing me a copy of "Source Impedance of HF Amplifiers and the Conjugate Match". You asked me to let you know what I think of it, so here it it. After I downloaded the E-mailed
- /archives//html/Amps/1997-09/msg00213.html (8,612 bytes)
- 43. [AMPS] Autek RF Analist (score: 1)
- Author: realex@flash.net (Bob Alexander)
- Date: Mon, 22 Sep 1997 12:39:46 -0500
- Lane, I have an RF Analist and find it rather awkward to use but the results are accurate. ONly rreal complaint is battery life seems to be rather short. 73, Bob, W5AH -- FAQ on WWW: http://www.conte
- /archives//html/Amps/1997-09/msg00351.html (6,649 bytes)
- 44. [AMPS] SB220 (score: 1)
- Author: realex@flash.net (Bob Alexander)
- Date: Thu, 19 Jun 1997 21:02:15 -0500
- Howdy, I currently own two SB220s, one of which I bought in 1982. When I purchased it, it had a standy switch, step start in the power supply, filament step start, and an open .82 ohm resistor. My re
- /archives//html/Amps/1997-06/msg00295.html (7,903 bytes)
- 45. 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)
- 46. 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)
- 47. 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)
- 48. 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)
- 49. 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)
- 50. 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)
- 51. 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)
- 52. 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)
- 53. 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)
- 54. 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)
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