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Total 19 documents matching your query.

1. [Amps] Alpha 89 Fuse Blowing (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sun, 5 Aug 2007 16:35:26 -0400
Seeing there have been several recent discussions of amps blowing fuses, I'd like to ask for opinions on my Alpha 89. For about two years now the amp will be trouble free for a couple of months and t
/archives//html/Amps/2007-08/msg00010.html (7,770 bytes)

2. [Amps] Alpha 89 Filter caps (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sun, 11 Nov 2007 10:44:20 -0500
I have an Alpha 89 which about once a month blows the upper fuse or very rarely activates the fault circuitry, and on a recent occasion gave a grunt about 15 seconds after turn on, continued running
/archives//html/Amps/2007-11/msg00148.html (7,283 bytes)

3. [Amps] Amplifier Solid State Keying Relay Circuit (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Thu, 13 Dec 2007 16:48:40 -0500
I recently started using my old backup radio, a FT1000MP which I have owned for many years. The main rig was out for repair. I normally drive an Alpha 86 or 89 with QSK pin diode switching. After scr
/archives//html/Amps/2007-12/msg00156.html (7,793 bytes)

4. [Amps] Transceiver Output Impedance (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sat, 8 Mar 2008 19:10:26 -0500
I have been told that modern solid state HF transceivers have been designed to deliver rated power into a stated load resistance-almost always around 50 ohms-but that their effective internal impedan
/archives//html/Amps/2008-03/msg00082.html (6,910 bytes)

5. [Amps] Fan Dust Filter (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 3 Dec 2008 09:03:36 -0500
After 20 years or so, the dust filter on the external fan on my Alpha 86 is disintegrating. This is a square of almost paper-thin foam which fits in a frame on the input side of the fan. It looks a l
/archives//html/Amps/2008-12/msg00067.html (6,680 bytes)

6. [Amps] Alpha 86/89 Dial Lamps (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 3 Dec 2008 21:20:13 -0500
My aged Alpha 86 has burned out its tuning dial lamps. They are nasty to get to. Has anyone successfully replaced the lamps in an 86 or 89 with LEDs? If so could you send me some details? 73 Bob W2WG
/archives//html/Amps/2008-12/msg00084.html (6,336 bytes)

7. [Amps] AL86 Dial Lamp Info (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sat, 13 Dec 2008 12:08:56 -0500
Can someone tell me what bulb is used for the AL86 tuning lamps and whether they are powered from AC or DC. I have found a possible replacement, but my manual and schematics do not provide lap inform
/archives//html/Amps/2008-12/msg00213.html (6,618 bytes)

8. [Amps] AL 80B Question (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Mon, 19 Jan 2009 16:50:18 -0500
I have a very early AL80B. It will produce 500-700W key down on all bands--except 30m. Of course you don't need much of an amp on 30m with the limit being 200W, but I am curious as to what the proble
/archives//html/Amps/2009-01/msg00170.html (7,360 bytes)

9. [Amps] Alpha 89 160m problem (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sun, 1 Feb 2009 10:11:09 -0500
I have an odd problem with an Alpha 89 -only below around 1815 kHz on 160m, nowhere else, and I am looking for ideas. The Alpha 89 tuning chart shows that the loading control around 1825 is probably
/archives//html/Amps/2009-02/msg00002.html (7,691 bytes)

10. [Amps] New Ameritron Solid State Amp? (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sat, 7 Feb 2009 22:13:58 -0500
Does anyone know the details of this amp? ALS-1300 <http://www.ameritron.com/Product.php?productid=ALS-1300> HF AMP, 1200 WATT SOLID STATE $2,899.00 Bob W2WG _________________________________________
/archives//html/Amps/2009-02/msg00186.html (7,103 bytes)

11. Re: [Amps] ALS-1300 (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sun, 8 Feb 2009 10:22:44 -0500
10m/12m kit $29.95 according to the Ameritron add. Waiting for FCC type approval. Bob W2WG To make it easy for folks: 1200W output (continuous they state) 1.5 to 22MHz. Not yet available. http://www.
/archives//html/Amps/2009-02/msg00198.html (7,711 bytes)

12. Re: [Amps] Fw: Nichrome wire for suppressors (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 11 Feb 2009 18:25:11 -0500
It's funny because I had just asked Dick Byrd about a week ago about who the folks were in the amplifier parasitic wars around 1995. And doggone, Dick remembered! 73 Bob W2WG MEOW...... PHHTT Cat fig
/archives//html/Amps/2009-02/msg00339.html (10,454 bytes)

13. Re: [Amps] NYE MB-V-A tuner (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Fri, 20 Feb 2009 20:28:14 -0500
There is also a slightly earlier version of this fine tuner which does not have the auto range detection. You must manually set it to the appropriate range via a slide switch. 73 Bob W2WG --Original
/archives//html/Amps/2009-02/msg00604.html (9,379 bytes)

14. Re: [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Fri, 3 May 2013 22:07:25 -0400
As a former Bell Labs design supervisor in the cellular wideband linear amplifier design area, I can say that predistortion schemes as well as feedforward linearization were being studied intensely a
/archives//html/Amps/2013-05/msg00054.html (9,753 bytes)

15. Re: [Amps] Alpha Input SWR (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sat, 10 Jan 2015 17:53:26 -0500
Yes--the coax length does have an effect, and though my Alphas are from 1993 and earlier the manuals (which were all "preliminary") did suggest the use of a connecting coax of about 5 or 6 feet. With
/archives//html/Amps/2015-01/msg00023.html (8,380 bytes)

16. Re: [Amps] Input SWR revisited (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 14 Jan 2015 17:36:55 -0500
I suggest a look at this non-mathematical paper--assuming this list supports links. Forward and Reflected Power <http://www.advanced-energy.com/upload/File/White_Paper s/SL-WHITE7-270-01.pdf> You can
/archives//html/Amps/2015-01/msg00115.html (10,278 bytes)

17. Re: [Amps] Input SWR revisited (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 14 Jan 2015 19:00:38 -0500
Hopefully no one would run a multi quarter wave line for a match in the shack since, if you look at the Smith chart, you are back to where you started after a 360 angular rotation on the chart. The p
/archives//html/Amps/2015-01/msg00121.html (13,125 bytes)

18. Re: [Amps] Input SWR revisited (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Wed, 14 Jan 2015 19:34:18 -0500
Those are what I use as well. I think they are the best around. I hope ARRL keeps including them in handbooks. 73 Bob easily done on a computer but an understanding of the Smith chart and the equatio
/archives//html/Amps/2015-01/msg00124.html (10,104 bytes)

19. Re: [Amps] "Conventional" current flow (score: 1)
Author: "Robert Carroll" <w2wg@comcast.net>
Date: Sat, 3 Dec 2016 21:39:52 -0500
See the first "filming" of an electron at http://phys.org/news/2008-02-electron.html . This was done in 2008. Later it was possible to see an image of an electron orbiting a nucleus ( electron orbiti
/archives//html/Amps/2016-12/msg00041.html (11,546 bytes)

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