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Total 25 documents matching your query.

1. Re: [Amps] Power combiners and antennas??? (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 21 Jan 2004 21:24:39 -0700
After 25 years in commercial broadcasting maintaining both 50 kW AM and 50 kW FM transmitters, there was nothing I disliked more than combining two 25 kW FM transmitters to get 50 kW out. When you us
/archives//html/Amps/2004-01/msg00218.html (9,407 bytes)

2. Re: [Amps] RE: Power combiners and antennas??? (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 21 Jan 2004 21:27:49 -0700
Jurgen van de Glind wrote: I couple 2x AM6154 for >1KW the following way. http://www.vandeglind.demon.nl/hybridring.htm cheap and easy Jurgen PE1LWT Date: Mon, 19 Jan 2004 10:54:08 EST From: JimMoci@
/archives//html/Amps/2004-01/msg00219.html (8,740 bytes)

3. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Thu, 22 Jan 2004 11:43:44 -0700
I have a manual tune version of the amp, an Alpha 89, along with an Alpha 99. See Walt, W0CP's web site on a fix for the 781 ALC spike problem. (W0CP.com) While the spike is there with the Icom, I ha
/archives//html/Amps/2004-01/msg00231.html (10,246 bytes)

4. Re: [Amps] Choosing a first amp (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Tue, 02 Mar 2004 00:22:07 -0700
I have two TL-922As with all the Measures mods and Kessler QSK and bias mods . They are stable now, work fine on semi-breakin, and put out 1200 watts. The down side is the output loading cap is under
/archives//html/Amps/2004-03/msg00015.html (9,208 bytes)

5. [Amps] Alpha 89 question (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sat, 17 Apr 2004 20:29:37 -0600
I may have a keying / PIN diode switch problem with my Alpha 89. There are key down make and key up break noises (pop or click) that did not exist before. Can anyone confirm whether the following obs
/archives//html/Amps/2004-04/msg00111.html (7,668 bytes)

6. Re: [Amps] Blowing off steam (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 20 Oct 2004 20:57:46 -0600
NC0B wrote: I don't see that there is a problem on eBay. I have a 282 rating, which means my wife and I have bought or sold at least that many items. I have been cheated only once for $15.00 from a l
/archives//html/Amps/2004-10/msg00347.html (11,437 bytes)

7. Re: [Amps] TL-922A - Loud Pop, Blown Fuses (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sun, 05 Dec 2004 18:17:04 -0700
I think the filaments are in series in the 922, so you cannot pull one tube and test the amp that way. 73, Rob, NC0B Tom Cathey wrote: Hi Clay, That's good - you've made some progress and eliminated
/archives//html/Amps/2004-12/msg00098.html (19,257 bytes)

8. [Amps] DX Eng antenna switch (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 05 Jan 2005 21:32:26 -0700
Has anyone used the DX Engineering relay actuated 8 port remote antenna switch? W0YG just bought one, and is impressed. Anyone been using it longer than a few days? How is the SWR on 10 meters? Any d
/archives//html/Amps/2005-01/msg00064.html (6,458 bytes)

9. [Amps] Link coupling (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sat, 08 Jan 2005 18:22:11 -0700
Can anyone who goes back before me (licensed in 1961) explain the theory behind the link input on a Johnson Matchbox? I started with a 275 watt model in the early 60s, and now have a pair of KW versi
/archives//html/Amps/2005-01/msg00134.html (8,114 bytes)

10. [Amps] Testing a tuner (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sun, 09 Jan 2005 14:23:54 -0700
If the League is really only using resistive loads, then they could make the loads reactive with inductors or capacitors. This would be time consuming, but what other option do they have? The balance
/archives//html/Amps/2005-01/msg00158.html (7,866 bytes)

11. Re: [Amps] Two quick loading questions (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 09 Feb 2005 20:20:36 -0700
I have always been puzzled by the "maximum smoke" tuning recommendations of some amps, AL-80A or B, for example. A single 3-500Z in linear service is rated at 400 mA plate current. (350 mA in class C
/archives//html/Amps/2005-02/msg00379.html (10,414 bytes)

12. [Amps] HP spare parts (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 06 Jul 2005 09:14:20 -0600
Great comments on the mechanical issues of the 8640B. I believe the white gears tended to split, mine did, but the later light green colored ones were better. No matter what HP generator you own, you
/archives//html/Amps/2005-07/msg00032.html (6,698 bytes)

13. Re: [Amps] 8640B sig gen TSPA (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 06 Jul 2005 13:38:37 -0600
The 8642A or B are great generators until they break. I have one, and it was even slightly cleaner in the close-in phase noise department than my 8662As until it started having intermittent noise bur
/archives//html/Amps/2005-07/msg00035.html (10,350 bytes)

14. [Amps] Alphas and 781s (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Wed, 12 Oct 2005 17:26:34 -0600
I don't have an 87A, but do have an Alpha 89 and two 99s, plus two IC-781s. Here are some comments on these pieces of equipment. I never use the ALC on the Alphas. When using the 781 on CW, be sure t
/archives//html/Amps/2005-10/msg00301.html (7,332 bytes)

15. Re: [Amps] AC wiring (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Fri, 21 Oct 2005 20:37:11 -0600
I own a house built in 1925, which was rewired with breakers in the 50s or 60s. When I bought it in 1971, I paid little attention to the FPE (Federal Pacific Electric) breakers outside in the box. So
/archives//html/Amps/2005-10/msg00526.html (13,893 bytes)

16. Re: [Amps] AC wiring (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Fri, 21 Oct 2005 20:45:35 -0600
I have a question about the wire size issue. I have one Alpha at shack that they draw over 11 amps (at 240 volts), assuming 1500 watts out. What is the need for over a 20 amp circuit, assuming a norm
/archives//html/Amps/2005-10/msg00527.html (9,910 bytes)

17. [Amps] Voltage at feed point (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sat, 26 Nov 2005 10:25:22 -0700
Anyone know a formula for calculating the voltage at the feed point of a vertical if you know the resistive and reactive values and the power? Example: 160 meter inverted L, R = 80 ohms, X = +420j &
/archives//html/Amps/2005-11/msg00489.html (7,084 bytes)

18. [Amps] Pin Diodes (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Tue, 07 Mar 2006 22:19:49 -0700
It is interesting that Alpha threw in the towel on PIN diodes with the upcoming 9500. Tech support told me the yield on a batch of diodes was terrible, possibly as low as 30%. That is a shame, as my
/archives//html/Amps/2006-03/msg00184.html (6,906 bytes)

19. Re: [Amps] 3-1000Z - Filament Voltage (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Fri, 12 May 2006 13:18:08 -0600
In the broadcast industry, where I worked for 25 years as a transmitter tech besides studio jobs, the transmitters usually had a pot or variac to adjust the filament voltage. My normal procedure was
/archives//html/Amps/2006-05/msg00091.html (10,765 bytes)

20. [Amps] Alpha 89 (score: 1)
Author: Rob & Terri Sherwood <rob@sherweng.com>
Date: Sun, 14 May 2006 15:53:09 -0600
Are there any members of this reflector who own an Alpha 89, and would be willing to correspond via e-mail or phone about some T/R switching issues? If so, please contact me at "rob@nc0b.com". ______
/archives//html/Amps/2006-05/msg00095.html (6,135 bytes)

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