odd results working at 250ksp/s

Ralph A. Schmid, dk5ras ralph at schmid.xxx
Tue Oct 22 09:00:42 UTC 2013

Effective filtering must occur between antenna and receiver. All the
problems that a saturated preamp and ADC cause can't be repaired by
software. Never.





From: osmocom-sdr-bounces at lists.osmocom.org
[mailto:osmocom-sdr-bounces at lists.osmocom.org] On Behalf Of David Jacobowitz
Sent: Tuesday, October 22, 2013 10:45 AM
To: Sylvain Munaut
Cc: osmocom-sdr at lists.osmocom.org
Subject: Re: odd results working at 250ksp/s


Thank you. You and another forum member have helped me understand the
situation. I am beginning to see the attraction of SDR platforms that
integrate an FPGA immediately after the ADC. You can have wide analog
filtering going to an ADC running fast, and then apply digital filters in
the FPGA before downsampling to a lower rate for consumption by


I can accomplish the same completely in software; I'll set the sample rate
high, then filter and decimate, probably in a few stages to keep the filters
reasonable. I tried it this evening with some raw IQ recordings I made this
afternoon and it works pretty well -- on a modern PC.



Dave J



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