[Amps] Multi-Amp w/ Power Combiners

[Sam Carpenter]

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 up.

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of George Watson
Sent: Friday, August 24, 2012 11:36 AM
To: amps at contesting.com
Subject: Re: [Amps] Multi-Amp w/ Power Combiners

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
about how to tune the individual amps, which might prove to be challenging.

George/K0IW

On Aug 24, 2012, at 10:57 AM, Jerry Kaidor wrote:

>> How do you ensure phase matching between the amplifiers?
> 
> *** 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
> 
>> 
>> 
>> 
>> 
>> 
>> ========================================
>> Message Received: Aug 23 2012, 01:16 PM
>> From: "Sam Carpenter"
>> To: amps at contesting.com
>> Cc:
>> Subject: [Amps] Multi-Amp w/ Power Combiners
>> 
>> 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 net 
>> savings because of the relatively low cost of building medium power 
>> amps. It seems like a reasonable way to build a lot of power and 
>> spread the stress of a system out a bit to lower priced components. 
>> It also partially eliminates the single point of failure to take all 
>> the power down with a single glitch. I understand that frequency 
>> agility would be more cumbersome and time consuming, but in many 
>> applications, you don't move much. Neither input nor output combining 
>> is complicated so long as you are staying fairly put with regard to 
>> frequency. Does anybody do this outside of broadcasting and 
>> commercial? N9FUT
>> 
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> 
> 
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