- 41. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Fri, 18 Dec 2009 11:43:53 -0600
- If you are concerned about the heat and are running data 100% d/c for 30 seconds I'd simply drop the exciter power 50%, retune the amp and forget about any cooling mod. 73 Rob K5UJ __________________
- /archives//html/Amps/2009-12/msg00439.html (8,455 bytes)
- 42. Re: [Amps] Ten Tec Centurion (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sat, 9 Jan 2010 19:07:20 -0600
- I am a Centurion owner. I assume you plan to operate typical SSB and CW. It is okay for those modes. It has good metering and the tank circuit and plate h.v. choke seem good. I get 1 KW on 160, and 9
- /archives//html/Amps/2010-01/msg00066.html (7,683 bytes)
- 43. Re: [Amps] which HV connector to use? (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Thu, 14 Jan 2010 15:31:54 -0600
- I'm trying to get my head wrapped around all this. I am planning a h.v. supply homebrew project and have most of the parts (but every time I think that something like this comes up). I want to build
- /archives//html/Amps/2010-01/msg00179.html (9,081 bytes)
- 44. Re: [Amps] which HV connector to use? (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Fri, 15 Jan 2010 12:35:39 -0600
- okay guys thanks vy much. I'm getting a better picture now on how to proceed. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
- /archives//html/Amps/2010-01/msg00209.html (10,693 bytes)
- 45. Re: [Amps] Good amp to buy (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Wed, 27 Jan 2010 11:33:22 -0600
- Craig, This has nothing to do with answering your question but rather I could not help noticing your call is W9OD. I knew (distantly) an earlier or perhaps the original W9OD in case you ever wondered
- /archives//html/Amps/2010-01/msg00379.html (7,786 bytes)
- 46. Re: [Amps] Good amp to buy (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Thu, 28 Jan 2010 12:58:14 -0600
- Re the 8877 with Ep of 4 KV -- you might want to look at the 3rd order IMD specs. for that tube at increased voltage. I am unfamiliar with the 8877 operating conditions but I think IMD gets worse wit
- /archives//html/Amps/2010-01/msg00400.html (9,989 bytes)
- 47. Re: [Amps] Good amp to buy maybe build? (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Fri, 29 Jan 2010 18:04:33 -0600
- Bill, I'm going down that road and know others who have been there. First, you only build what you cannot buy. Otherwise it is far cheaper to buy something manufactured. Making drilled and punched ca
- /archives//html/Amps/2010-01/msg00464.html (8,910 bytes)
- 48. Re: [Amps] Good amp to buy maybe build? (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Fri, 29 Jan 2010 20:46:25 -0600
- That's a really good idea. I have a four side rack from a broadcast station. I'll keep a lookout for HP stuff at flea markets. Thanks. 73 Rob K5UJ _______________________________________________ Amps
- /archives//html/Amps/2010-01/msg00470.html (11,326 bytes)
- 49. Re: [Amps] Good amp to buy (or something like that) (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 31 Jan 2010 09:15:54 -0600
- I'm afraid I must disagree in some cases. I know nothing about the Icom ALC design but I'll be willing to bet it is typical of modern ham SSB transceiver design attempts at a cheap way of preventing
- /archives//html/Amps/2010-01/msg00571.html (10,386 bytes)
- 50. Re: [Amps] Good amp to buy maybe build (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 31 Jan 2010 09:22:08 -0600
- Some parts at flea markets are safer than others. It is pretty hard to go wrong buying output tank circuit inductors and air variable caps for example. Plate and cathode chokes are probably a safe bu
- /archives//html/Amps/2010-01/msg00572.html (7,687 bytes)
- 51. Re: [Amps] Good amp to buy (or something like that) (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 31 Jan 2010 13:17:02 -0600
- I have performed tight peak limiting on audio operating SSB and find it works well and the ALC is not needed. There is a relationship between input audio amplitude and SSB RF power IF your SSB transm
- /archives//html/Amps/2010-01/msg00587.html (14,187 bytes)
- 52. Re: [Amps] Good amp to buy (or something like that) (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 31 Jan 2010 17:23:45 -0600
- Gary, You are correct but your knowledge is out of date. What you say does indeed apply to old methods of analog audio limiting such as diode clipping (eg CBS Labs Volumax) which should not be used i
- /archives//html/Amps/2010-01/msg00606.html (18,574 bytes)
- 53. Re: [Amps] Fleamarkets and more (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Thu, 4 Feb 2010 18:05:41 -0600
- If there is a lack of homebrewing of big RF it is due to death by 1000 cuts. Many minor factors have combined to end the practice. Notice that QST doesn't seem to run anything on homebrewing with hig
- /archives//html/Amps/2010-02/msg00111.html (9,903 bytes)
- 54. Re: [Amps] QRO vs QRP (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sat, 20 Feb 2010 23:39:19 -0600
- Antenna limits and QRN are why God created ten meters : ) Actually the other thing about hearing on the low bands is not getting more signal with big antenna but getting better S/N ratio by reducing
- /archives//html/Amps/2010-02/msg00599.html (7,563 bytes)
- 55. [Amps] homebrewing (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Fri, 26 Mar 2010 10:14:29 -0500
- If you want a hb amp that looks real pretty you are hb for the wrong reason. Another obstacle to overcome is the perfectionist one. "What if it doesn't work?" As one OT once told me anything worth do
- /archives//html/Amps/2010-03/msg00645.html (8,652 bytes)
- 56. Re: [Amps] stereo to mono (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 9 May 2010 09:29:32 -0500
- <<<We HAMS have not been building high level modulated A.M. transmitters for many years (A.M. transmissions suffer from heterodyne interference which becomes horrific in a crowded HAM band) so I reco
- /archives//html/Amps/2010-05/msg00116.html (8,058 bytes)
- 57. Re: [Amps] stereo to mono (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 9 May 2010 10:18:38 -0500
- Correction: The K7DYY product is not a kit. Sorry for the error. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
- /archives//html/Amps/2010-05/msg00117.html (8,973 bytes)
- 58. Re: [Amps] stereo to mono (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 9 May 2010 11:19:13 -0500
- In addition to Carl's excellent comment, I'd like to mention my source of last resort for used books. If you can't find the Orr or other handbook at a hamfest (Dayton coming up is a pretty good place
- /archives//html/Amps/2010-05/msg00119.html (12,304 bytes)
- 59. Re: [Amps] Stereo to mono (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Sun, 9 May 2010 17:29:33 -0500
- Okay Frank, I understand now. You are trying to figure out how to modulate a pair of 4-400 with a solid state modulator. With the solid state gear I only vaguely know that there is often a problem ha
- /archives//html/Amps/2010-05/msg00124.html (8,750 bytes)
- 60. Re: [Amps] Heathkit manuals (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Thu, 20 May 2010 13:11:44 -0500
- <<<Yah gotta admit some people are...Optimistic...and gullible. 6X to 10X the retail price. I have something almost as bad: somewhere on eBay someone is selling a 4-1000A, chimney and plate heat sink
- /archives//html/Amps/2010-05/msg00225.html (7,806 bytes)
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