[hpsdr] Pre-distortion

[Warren C. Pratt]

Hi Nige,

The pre-distortion must be turned on by the user to be active -- so, 
there is no requirement to use it.  In fact, I expect that many people 
will not establish the feedback path that is required to calibrate.  
However, it would be interesting to try using it with transverters.  For 
it to function correctly with a transverter, the receive down-conversion 
path would have to be very linear to provide valid feedback for 
calibration.

Also, note that the pre-distortion is "adaptive"; it calibrates to 
correct the amplifier in use.  No specific amplifier characteristic is 
assumed in the code.

73,
Warren  NR0V

On 11/16/2013 1:36 AM, Nige G7CNF wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Thank you very much for all your hard work. One issue that I haven't 
> been able to resolve in my head from the TeamSpeak session is whether 
> the predistortion will  be user-activated? I ask this because I use 
> HPSDR (ANAN) with transverters and obviously the receiver will not be 
> able to monitor the final output for this function and was concerned 
> at the implications of hard-coded predistortion in this scenario.
>
> Best wishes,
>
> Nige.G7CNF
> interference.org.uk <http://interference.org.uk/>
>
>

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