[hpsdr] Pre-distortion

[Warren C. Pratt]

Hi Bert,

Good to hear from you.  I'll be sure to get the early software to you 
for testing.  We've worked well together in the past and I wouldn't want 
to miss the opportunity of the long Dutch winter!

73,
Warren  NR0V

On 11/16/2013 4:02 AM, H.A.Meijer wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> 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
>>
>>

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