[hpsdr] Pre-distortion

[Nige G7CNF]

TU.

Can't wait to try it. What you guys are accomplishing right now is 
awe-inspiring. Thanks again.

Nige.

On 16/11/2013 09:56, Warren C. Pratt wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> 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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