[Discuss-gnuradio] USRP Problems with decim_rate = 4

2008-07-28 Thread Sl Sl 
Hi
I think the USRP can provide the minimum decimate rate of 4. So I
changed the output data format from short to char. With 8-bit I  Q
decim = 4 -64M/4= 16MS/sec  ,IQ  - 32MB/sec. That is within the range
of my USB speed. In the make_format() function I set  the width = 8,
shift = 8. Then the out put of USRP will be char data. But when I read
the data from the USRP, I found all of them are just 0s. When I change
the decim_rate = 8, then I can get the right results. So I want to know
what is wrong in my method? How can I get data with decim_rate = 4?
-- 
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Re: [Discuss-gnuradio] USRP Problems with decim_rate = 4

2008-07-28 Thread Firas Abbas 
Hi,



You can use USRP with decim_rate = 4 only if you use FPGA image std_4rx_0tx.rbf 
(no half band filter). See:

http://gnuradio.org/trac/wiki/UsrpFAQ/DDC





Firas

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