[hpsdr] Atlas based HPSDR PureSignal

[HA5FT Jani]

Belove you could find Phil's remark on this topic. According to him it loos possible to implement ps on atlas based system. The critical thing is the fpga size on pmelope and not the fpga size on mercury and not the transfer capability of the atlas bus.

Jani, ha5ft

2014. jan. 29. dátummal, 3:17 időpontban Phil Harman <phil at pharman.org> írta:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Bruce,
> 
> Is possible.  We would need to add the Tx modifications to Penny. Since
> that is a change to add a cFIR and modified CIC interpolator that should
> not be an issue.
> 
> We also need to implement a full DDC in order to feed back the data being
> fed to the DAC.
> 
> Since the DDC is always on the same frequency as the Tx we can use the
> same CORDIC for both Tx and Rx which will save some LUs.
> 
> We may run into FPGA size issues here.
> 
> The Atlas bus does allow for 4 receivers and the current Mercury code
> implements 3 so we are OK there.
> 
> The Mercury code will need to be modified to use the new FIRs but the FPGA
> has spare room so I think that should fit OK.
> 
> The other issue is the phase relationship between the DAC feedback and RF
> feedback may not be consistent.  I had that issue with the VNA code and
> solved it by sending the same phase word, rather than frequency, to the Tx
> and Rx CORDICs.
> 
> If that is an issue we could always calculate the phase word in Metis and
> sent it to Mercury and Penny over the Atlas bus.
> 
> I can't work on this at the moment since up to my eyes with other things
> but perhaps an interesting 'weekender' project for someone?
> 
> 73 Phil...VK6PH
> 
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>> 
>> 
>> Will the PureSignal software be available for the HPSDR ?
>> 
>> 
>> 73's , Bruce
>> 
>> KL7JDR-KL7SDR
>> 
>> Bruce W. Mills
>> P.O. Box 1500
>> 31490 Echo Lake Road
>> Soldotna , Alaska
>>   99669
>> 
>> (907)262-4373 Home
>> (907)398-4595 Cell
>> 
>> kl7jdr at alaska.net
>> 
>> 
>> 
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