Recently RTL-SDR.com reader Dr. Phil wrote in to let us know about some PDF notes that he has created about the RTL-SDR dongle. There is some good information in his documents and the notes mainly focus on using the RTL-SDR with the direct sampling mod to receive HF.
His other documents also explain concepts such as imaging, interference and gain, how to reduce interference, input impedance of the Q sampling pads, intermediate frequency, and sample rate. In addition he has also uploaded some documents where he has calculated for various AM, FM and SW stations at what frequencies images will show up. His final document also discusses the Mirics SDR chipsets which are used in the SDRPlay.
He writes that any corrections are welcome. Dr. Phil’s main website can be found at http://home.comcast.net/~
Pocket HF SDR Cookbook: http://home.comcast.net/%
HF Direct Sampling: http://home.comcast.net/%
Mirics Chipset: http://home.comcast.net/%