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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Multi\-Amp\s+w\/\s+Power\s+Combiners\s*$/: 22 ]

Total 22 documents matching your query.

1. [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Sam Carpenter" <sam@owenscommunication.com>
Date: Thu, 23 Aug 2012 08:16:48 -0400
I have often thought of why I do not see the running of multiple HF Tube amps with power combining networks. It would seem that the overall cost of using more than one smaller amplifier would be a ne
/archives//html/Amps/2012-08/msg00357.html (7,742 bytes)

2. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Thu, 23 Aug 2012 14:30:41 +0200
How do you ensure phase matching between the amplifiers? I have often thought of why I do not see the running of multiple HF Tube amps with power combining networks. It would seem that the overall co
/archives//html/Amps/2012-08/msg00358.html (7,920 bytes)

3. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 23 Aug 2012 09:26:20 -0400
years ago there was an article in QST I believe, using a pair of Heathkit compact kilowatt amplifiers using coax combiners and splitters. 73 Bill wa4lav ______________________________________________
/archives//html/Amps/2012-08/msg00360.html (8,848 bytes)

4. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Thu, 23 Aug 2012 08:02:02 -0600
In a general RF power combiner the difference of amplitudes or phases between the 2 sources to be combined has the following effects. 1.) Equal TX amplifier amplitudes and phases = max. power output
/archives//html/Amps/2012-08/msg00361.html (9,115 bytes)

5. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Tom Osborne" <w7why@frontier.com>
Date: Thu, 23 Aug 2012 08:33:42 -0700
Yes, they used 2 Heathkit mobile KW amps. The used phasing lines to combine the 2 outputs together. 73 Tom W7WHY years ago there was an article in QST I believe, using a pair of Heathkit compact kilo
/archives//html/Amps/2012-08/msg00362.html (7,719 bytes)

6. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Jerry Kaidor" <jerry@tr2.com>
Date: Fri, 24 Aug 2012 09:57:24 -0700 (PDT)
** Well, they're both fed with the same signal. If they're the same sort of amp, tuned the same, the phase should be the same, right? - Jerry Kaidor, KF6VB __________________________________________
/archives//html/Amps/2012-08/msg00378.html (9,945 bytes)

7. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: George Watson <georgekwatson@hotmail.com>
Date: Fri, 24 Aug 2012 09:35:47 -0600
As long as critical cable lengths are maintained, and the amps are same manufacturer, it should be 'close enough' on HF. You'd lose a little in phase difference, but not a lot. I have not thought abo
/archives//html/Amps/2012-08/msg00380.html (10,756 bytes)

8. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 24 Aug 2012 08:45:53 -0700
There is phase shift in ANY transmission line that is directly related to its electrical length (that is, as a fraction of a wavelength). Wavelength in the line is a function of frequency AND the vel
/archives//html/Amps/2012-08/msg00381.html (8,212 bytes)

9. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Jerry Kaidor" <jerry@tr2.com>
Date: Fri, 24 Aug 2012 10:49:49 -0700 (PDT)
Indeed. Honestly, it sounds impractical for other than a fixed-frequency application. - Jerry, KF6VB _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2012-08/msg00382.html (9,415 bytes)

10. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "John D'Ausilio" <jdausilio@gmail.com>
Date: Fri, 24 Aug 2012 12:28:30 -0400
the cable lengths are very short compared to the wavelength .. we're not talking about feedlines here ;) 0.02 de w1rt/john _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2012-08/msg00383.html (12,304 bytes)

11. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 24 Aug 2012 11:47:37 -0500
Seen it done on 75 Meters with a pair of 30S-1s. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-08/msg00384.html (9,771 bytes)

12. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Sam Carpenter" <sam@owenscommunication.com>
Date: Fri, 24 Aug 2012 12:47:59 -0400
I would think they could be tuned with both connected and into a starting 50 ohm load one at a time if the combiner matching were correct. Once into the final load, you should be able to touch them u
/archives//html/Amps/2012-08/msg00385.html (12,239 bytes)

13. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Sam Carpenter" <sam@owenscommunication.com>
Date: Fri, 24 Aug 2012 12:53:08 -0400
A pair of unmodified 30s-1s would produce a nice ouput while resting. Should be plenty clean too! --Original Message-- Seen it done on 75 Meters with a pair of 30S-1s. Don W4DNR wavelength). ________
/archives//html/Amps/2012-08/msg00386.html (9,963 bytes)

14. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Fri, 24 Aug 2012 13:07:41 -0400
Any tuning will alter the phase (delay) and gain of each amplifier. -- Ron - KA4INM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
/archives//html/Amps/2012-08/msg00387.html (9,101 bytes)

15. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Jerry Kaidor" <jerry@tr2.com>
Date: Fri, 24 Aug 2012 11:47:43 -0700 (PDT)
** The original question was about multiple *tube* amps. I've seen the solid state amps using combiners - I remember a QST article back in the 80's, when high power solid state was pretty exotic. Do
/archives//html/Amps/2012-08/msg00388.html (9,070 bytes)

16. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Fri, 24 Aug 2012 12:00:43 -0600
Generally yes if the combined port is at the correct impedance. The term you asking about is called isolation and it is specified port to port and is a function of terminating impedances. If you care
/archives//html/Amps/2012-08/msg00390.html (9,940 bytes)

17. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 25 Aug 2012 14:40:10 +0100
I think one might struggle with tube amps, as any tuning adjustments on the input or output are likely to change the phase of the signal at the output of the amps. Unless the two signals arriving at
/archives//html/Amps/2012-08/msg00401.html (9,475 bytes)

18. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 25 Aug 2012 18:12:39 -0400
Yes. I remember RCA made an AM broadcast rig called the "Ampliphase" that used two tubes 90deg out of phase and obtained AM by phasemodulating one of the tubes' RF input to 0 deg or 180 deg compared
/archives//html/Amps/2012-08/msg00419.html (9,658 bytes)

19. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 25 Aug 2012 19:09:14 -0500
Everything I ever heard about that rig was that it was a nightmare to run. A few years ago at a series of local hamfests the chief at the 1160 station here parted out theirs and many hams happily ca
/archives//html/Amps/2012-08/msg00423.html (9,096 bytes)

20. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 25 Aug 2012 21:36:01 -0400
Non-affectionately known as the "Amplifuzz". Need I say more? You mean it had GOOD PARTS! -- Jim, W2XO _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2012-08/msg00427.html (9,186 bytes)

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