[Elecraft] Amplifier thoughts

[Matthew Cook]

You can always use impedance transformers to bring your match back within
the "impedance range" of your tuner.   These cost far less per unit price
than the components required to beef up an internal tuner to handle
impedance's of 500-800 ohms or more (or the conjugate) with a solid state
amp.

A simple 3:1 impedance transformation is not expensive in terms of
components and allows you to flatten out the band edges of a dipole or
beam.  Out side of this your amplifier is asking you to pay attention.

For those wanting to use antenna with high impedance (or very low
impedance) feed point there are tuners already that will suit your purpose.
  Thinking about that it would be nice if the KAT1500 could have some form
of tuner interface (like the Icom and Kenwoods) where an external tuner can
be activated, RF applied and held until the tuner releases the tune line.

In the real world as you put it capacitors look like door knobs and
inductors are large enough to stand in and everything is silver plated.
There's that pesky issue with the voltage being the square of the current
for a fixed impedance, it does take long for things to get nasty as you
increase the current by 1 or 2 amps at a time.

73

Matthew
VK5ZM

On 29 March 2017 at 10:00, brian <alsopb at comcast.net> wrote:

> KAT500 handles a much wider SWR range (like to about 10:1).
>
> Why do you assume people are lucky enough to have antennas with no more
> than a 3:1 SWR across the ham bands?
>
> Yes, higher SWR's require beefed up components but welcome to the real
> world.
>
> 73 de Brian/K3KO
>
>
> On 3/28/2017 23:00 PM, Paul Van Dyke wrote:
>
>> Ralph Parker said my list.....
>>
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 4  outputs (Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations.  :-)
>>
>> Paul. KB9AVO​
>>
>> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve7xf at shaw.ca> wrote:
>>
>> I better post this before I'm too late.
>>>
>>> I'd like:
>>> All the features of my KPA500, plus
>>> 1500w output, 160 - 6m.
>>> 2 inputs.
>>> 2 outputs (or more. Manual switching is OK).
>>> Built-in antenna tuner (good for 3:1 SWR).
>>> Reasonably quiet fans.
>>> Separate p/s, or remote control head (space considerations).
>>>     (I understand the difficulty of getting high power from the p/s to
>>> the
>>> PA.)
>>> I don't expect to carry it around, so weight is not a problem for me.
>>> Expeditions can use the KPA500 :-)
>>>
>>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>>> I'm keeping my KPA-500!
>>>
>>> Ralph, VE7XF
>>>
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