[Elecraft] KPA500 Combiner

[Val]

Vic,

The problems would not be frightful if the amplifiers are of a same 
model and the combiner is designed to withstand  to 5-10% difference 
between the amplifiers outputs.

Anyway, combining 2-3 KPA500 makes no much sense for me, but if you 
need a 5kW auto tune amplifier (not for a ham use of course), you may 
find it more expensive than 3 pcs ACOM 2000A and the due combiner.

73, Val LZ1VB



> My thought is that connecting two standalone amplifiers, each with 
> its own protective circuits, bias supplies, etc. with a combiner is 
> kludgy and likely to lead to problems.
>
> Now the KPA1500 prototype -- that was neat.
>
> On 3/3/2014 9:33 AM, David Gilbert wrote:
>>
>> I really don't find those kinds of generalizations very 
>> constructive ...
>> or accurate.  LOTS of hams live where putting up an additional 
>> kilobuck
>> worth of aluminum is out of the question due to space or 
>> neighborhood or
>> aesthetic considerations.   An extra 3 db of transmit power can 
>> make a
>> noticeable difference for them without violating those other
>> considerations, especially if their local noise levels are low on
>> receive.  Whether that is worth $1K to them will vary from ham to 
>> ham.
>>
>> Besides, for many hams who already have decent antennas on a decent
>> tower, it would probably take considerably more than $1K to get 
>> that
>> extra 3 db out of more aluminum.
>>
>> Lastly, if you don't think an extra 3 db can represent a 
>> significant
>> improvement on HF, check out 
>> http://www.ab7e.com/weak_signal/mdd.html
>> Anybody who is an active contester or DXer on HF will often find 
>> that
>> extra 3 db useful in a pileup.
>>
>> 73,
>> Dave   AB7E
>
>
> -- 
> 73,
>
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
>
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