[hpsdr] Predistortion and different types of amplifiers?

[Ken N9VV]

John, how about using a DUMMY LOAD and turning the AUTO TUNER OFF?
You should be all set if the Dummy can handle the power output that you 
intend to use.

rgds,
N9VV

On 2/12/2014 6:34 PM, John Marvin wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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

 1392252491.0