[Amps] Amps with high swr question

[Roger D Johnson]

Impedance matching is only one of the functions a tuned input circuit on the 
input of a GG
linear amplifier performs. The other is the "flywheel effect" that smooths out 
impedance
variations that occur during the RF drive cycle. Most autotuners are L networks 
and do not
provide the Q necessary for this function.

73, Roger


On 1/15/2015 6:46 AM, Paul Christensen wrote:
>> "If someone has an amp that has high input vswr, why not break the path
> between the amp relay and the input to the tube and insert a 200 watt
> auto tuner?   Between the relay and tube ... not in the receive path.
> On the surface, this sounds like a relatively inexpensive way to
> retain an otherwise good performing amp.   What did I miss ?"
>
> Several homebrew amp builders have done just that.   One that comes to mind is
> the 3CX1500D7 amp made by K8RA (SK).   He installed an LDG auto tuner after
> the RF input relay.   You can see the tuner board mounted inside the bottom
> corner of his amp.  Scroll down to page 7.
>
> http://www.ldgelectronics.com/assets/discontinued_manuals/AT-100AMP%20Manual.pdf
>
> Paul, W9AC
>
>
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