[hpsdr] PennyWhistle driving an Ameritron AL-811

[Chris Wilson]

> Has anyone else tried driving an Ameritron AL-811 amplifier using
> the PennyWhistle amplifier? I have ruined 6 power MOS FETs trying to do this.

> It's weird because my SoftRock can drive my AL-811 to 30 Watts by
> itself without damage but as soon as I try the PennyWhistle I blow out its FETs.

> Has anyone else had this problem -- and if so what changes did you
> make to the AL-811 or PennyWhistle to stop this from happening?

> Mike N9MS

>  


10/05/2013 07:15

There's considerable discussion of the AL-811 input matching circuit
here  ; http://forums.qrz.com/showthread.php?31808-AL-811-Amplifier

Do you run a decent SWR meter between the PW driver amp and the Ameritron?

I always leave an SWR meter between a SS driver and my Collins 30L-1
linear, to keep an eye on things.

-- 
       Best Regards,
                   Chris Wilson.


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