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DAX I/Q questions

Mario_DL3LSM
Mario_DL3LSM Member ✭✭
edited August 2017 in SmartSDR API
Hi there,

I just started to look at DAX I/Q in FlexLib with the intention to include it in xDAX if possible.

From this I have some simple questions:

- the data format is float normalized to +- 1.0 right?
- does DAX I/Q follows the convention left channel is I and right is Q?? Or for the interleaved data is it IQIQIQ or QIQIQI??
- what is the use the "capacity" and "available" properties?

Thanks and 73
Mario, DL3LSM

Answers

  • Ed.G
    Ed.G FlexRadio Employee ✭✭
    edited August 2017
    Yes the data is float normalized to +/- 1.0. 
    Left channel is I and right channel is Q I believe so it should be interleaved in the payload as IQIQIQ

    There is a limit to how many IQ streams can stream. I believe capacity and available are supposed to reflect total capacity in "capacity" and available capacity in "available". Today we don't use these but they may be enforced later. 
  • Mario_DL3LSM
    Mario_DL3LSM Member ✭✭
    edited August 2017
    Hi Ed,

    thanks.. I had it figured out over the weekend.. One correction though.. The IQ data inside the VITA packet is not float normalized to +/- 1.0 but to +/- 2^15 according to FlexLib and it seems to work if I use it like this..

    Thanks and 73
    Mario, DL3LSM

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