[Amps] Multi-Amp w/ Power Combiners

[John D'Ausilio]

the cable lengths are very short compared to the wavelength .. we're
not talking about feedlines here ;)

0.02 de w1rt/john

On Fri, Aug 24, 2012 at 11:35 AM, George Watson
<georgekwatson at hotmail.com> wrote:
> 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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