Over on the rtlsdr4everyone blog (previously known as the sdr4mariners blog), author Akos has uploaded a new post that compares 5 different RTL-SDR dongles against one another. He compares a Terratec R820T, Black Nooelec R820T, Blue Nooelec R820T2, our own RTL-SDR Blog R820T2 and a Nooelec Nano R820T.
In the post Akos gives an overview of the features of each dongle, and runs tests on things like frequency drift and broadcast FM interference. He also runs SNR tests on Airband, low UHF, high UHF signals and shortwave frequencies. His tests show that the dongles with the R820T2 chip outperform the dongles with the R820T chip by about 4-5 dBs in SNR, and that the overall best dongle is our RTL-SDR Blog dongle.
In the future Akos hopes to also review the Nooelec 9:1 balun.