[hpsdr] Pre-distortion

[H.A.Meijer]

HI Warren,

Very interesting you mentioned the use of transverters.
I'm running several transverters (and mosfet PA's with it) in 
combination with Hermes and it would be very nice
if I would be able to get just 'some' improvement for the IMD 
performance there.
I also heard of the completely new written DSP in hpsdr and I hope this 
will be revealed soon.
So this can be 'critically tested',  this long Dutch winter,  h.i.


Thanks anyway for the huge amount of work, and improvements to HPsdr, 
you do and already did for the HPSDR comunity,

Bert PA2XHF



Warren C. Pratt schreef op 16-11-2013 10:56:
> ***** 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 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
>>

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