[Amps] Alpha 9500 vs. Acom 2000A questions

[Dick Green]

I wonder if the 9500's firmware limit is a hangover from the 87A firmware, which has the same limit. My recollection is that it was set low to protect the PIN diodes. Of course the 9500 doesn't have PIN diodes.

73, Dick WC1M

On Dec 4, 2016, at 9:33 AM, Paul Christensen <w9ac at arrl.net> wrote:

>> "Actually this shows what are the parts used in the output tank. Obviously
> the Alpha parts are rated for less RF voltage and/or current."
> 
> You'll find the component quality and ratings of 9500's Pi-L and T/R system
> equal to the ACOM 2000A.  Differences between SWR limits can be attributed
> to firmware.
> 
> I've owned both amps and each has been on my bench for repairs.  They are
> both excellent performers.  Each has its strengths and weaknesses - mostly
> subtle.  
> 
> Not yet mentioned is that one can expect ~ 10 dB superior 3rd-order IMD
> performance with the 9500.  This is of a lesser concern when using an ANAN
> transceiver with the latest PowerSDR mRx software.  NR0V's pre-distortion
> algorithm can clean-up most any dirty amp by 10-15 dB when the amp is
> included in the correction loop.  
> 
> Paul, W9AC
> 
>