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Re: [Discuss-gnuradio] Problem converting RTL 8 bit IQ samples to gnurad

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Problem converting RTL 8 bit IQ samples to gnuradio native format.
Date: Wed, 19 Dec 2012 18:04:52 -0500
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On 12/19/2012 05:59 PM, Salvatore Sanfilippo wrote:
On Wed, Dec 19, 2012 at 11:55 PM, Marcus D. Leech<address@hidden>  wrote:

The RTL *WILL NOT* support sample rates reliably above 2.4Msps, regardless
of how well-appointed your CPU is.  It drops them internally in
   its pipeline.  I would suggest using 2.4Msps, and up-sampling to 4Msps.
Thanks Marcus, I noticed this using rtl_test + a very fast computer:
still losing bytes above 2.4.

So should I assume that when modes_rx uses gets data directly from RTL
there is a software layer performing the up-sampling, and this is a
probable cause of my issues after the conversion?


Seems likely, perhaps Nick can confirm.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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