[hpsdr] Predistortion and different types of amplifiers?

[John Marvin]

Warren,

Thanks. Once calibration is complete, how tolerant is the PureSignal 
adaptation to changes, i.e. if I switch bands, or just move enough in 
the current band to cause a change in tuner settings, will PureSignal 
"catch up" to the change as it might need to do with a change in 
temperature, or would the tuner change be too significant a change for 
PureSignal to follow?

But you're right, I can probably figure this out from just trying it. My 
only concern would be PureSignal making things worse due to a possibly 
more extreme tuner change than I had tested with.

Thanks,

John

On 2/12/2014 5:24 PM, Warren C. Pratt wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi John,
>
> I'd say give it a try and let us know how things go.  My 
> recommendation would be to let the tuner do its tuning and AFTER THAT 
> enable AutoCalibrate.  I suspect it will work fine.  You may want to 
> increase the Amplifier Delay parameter a bit to compensate for the 
> extra delay through the tuner.  If the tuner begins to tune with 
> AutoCalibrate ON, you might get some very strange and negative results 
> because some samples for calibration may be collected at a different 
> tuner setting than others in the same set.
>
> 73,
> Warren  NR0V
>
> On 2/12/2014 2:12 PM, John Marvin wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I noticed that the documentation shows that the rf sampler should be 
>> connected between the power amp output and the antenna tuner. In my 
>> case I'd like to try seeing what PureSignal can do with an Elecraft 
>> KXPA100 amplifier. However, the amp has the antenna tuner built into 
>> it. What effect will having the antenna tuner in the path have? I can 
>> easily believe I would need to recalibrate each time the tuner 
>> changes its settings.
>>
>> Thanks,
>>
>> John
>> AC0ZG
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