[Amps] Amps with high swr question

[Hardy Landskov]

But the Caveat to that is you have no control over the loaded Q in an L 
network. It is a function of load impedances.
73 Hardy N7RT

----- Original Message ----- 
From: "Roger D Johnson" <n1rj at roadrunner.com>
To: "Amplifier Reflector" <amps at contesting.com>
Sent: Thursday, January 15, 2015 10:53 AM
Subject: Re: [Amps] Amps with high swr question


> 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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