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Jay Salsburg jsalsburg at bellsouth.netIt is probably the difference in RF Gain. Jay Salsburg -----Original Message----- From: osmocom-sdr-bounces at lists.osmocom.org [mailto:osmocom-sdr-bounces at lists.osmocom.org] On Behalf Of Christian Buchner Sent: Sunday, September 09, 2012 2:01 PM To: osmocom-sdr at lists.osmocom.org Subject: Re: R820T tuner support in librtlsdr > If I have read the datasheets correctly, the E4000 is also able to use > a non-zero IF. Would doing this help reduce the spike in the middle > of the spectrum for sticks using the E4000? Here's a question for windows users.... Why do I not see a notable spike in the middle of the spectrum spike in the SDR Sharp application, but a very strong one in the HDSDR application using same the same USB dongle? This strikes me as odd. Christian