Re: SDR-IQ Data Rate

[Stan <verizon.net; stanw1le@xxxxxxxxxxxxxxxx>]

Hello Guy,

I suspect:

maximum datarate may be up to 480 Mbits/sec, minimum datarate is 0 bits/sec.

If the SDR-IQ max datarate is 196Ksamples /sec, there is unused capacity.

In addition to the raw data, there is overhead to operate the USB protocol,
as well as the SDR-IQ overhead.

Probably only under ideal conditions can the USB handle the max rate: 
short cables, no external noise,
no NACKs, "best most beautiful conditions".

Stan, W1LE


VK2KU wrote:
> Could someone please help me with some simple arithmetic?
>
> I understand that the maximum data rate from the SDR-IQ USB2 port into
> Linrad is around 196kHz, which presumably means samples per second of
> both the I and the Q channels.
> Each sample is 16 bits, so that means that each sample of I and Q
> comprises 32 bits total.
>
> I also read independently that the maximum rate of USB2 is 480
> Megabits/s.
>
> I realise that other data is also flowing back and forth, but the
> actual samples must surely represent the major part of the data flow,
> so I am unable to reconcile these 2 rates, and would like to
> understand.
>
> Thanks.
>
> Guy  VK2KU
> >
>
>   


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