Updating ubuntu 11 04 to 11 10
For both kinds the tuner error is ~30 -20 PPM, relatively stable once warmed up, and stable from day to day for a given dongle. The RTL2832 ADC differential input impedance is ~3,300 Ohm.
The R820T dongles use a 3.57 MHz or 4.57 MHz intermediate frequency (IF) while the E4000s use a Zero-IF.The sensitivity is somewhere around -110 d Bm typically.The highest safe sample rate is 2.56 MS/s but in some situations up to 3.2 MS/s works without USB dropping samples (RTL2832U drops them internally).For general use SDR# is probably the best application for windows with secondary mono-based linux and Mac support.
I normally use Gqrx but it requires GNU Radio dependencies.
Originally meant for television reception and streaming the discovery and exploitation of the separate raw mode used in FM reception was perhaps first noticed by Eric Fry in March of 2010 and then expanded upon by Antti Palosaari in Feb 2012 who found that these devices can output unsigned 8bit I/Q samples at high rates. rtlsdr as we know it today was created by the osmocom people in the form of rtl-sdr and osmo SDR, keenerd is the author of many other rtl_* tools: rtl_fm, rtl_power (heatmap.py), rtl_adsb and code changes accepted into the mainline. The dongles with an E4000 tuner can range between 54-2147 MHz (in my experience) with a gap over 1100-1250 MHz in general.