DAX I/Q questions

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  • Updated 2 years ago
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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
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Mario - DL3LSM

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Posted 2 years ago

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Ed.G, Software Engineer

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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. 
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Mario - DL3LSM

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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