[Amps] Multi-Amp w/ Power Combiners

[George Watson]

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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