One of the advantages of using Linrad on Linux used to be the ability to use a modified rtlsdr.dll file with improved sensitivity gain settings for the E4000 tuner. This mod added the following settings.
- AGC mode.
- Compromise. This is the gain settings available in the rtl-sdr library as of October 2012.
- Linearity mode. For use without filters in environments with strong signals. Low front end gain and high gain after filters.
- Sensitivity mode. For use in rural locations or when filters and preamplifiers are placed between the antenna and the dongle. High front end gain and low gain after the filters.
Here is a Reddit thread discussing the improvements, and showing how to apply them to Linrad.
Now Reddit user rtlsdr_is_fun has ported this mod to Windows, and has written an SDRSharp plugin that enables the modified E4000 gain modes via rtl_tcp. This means you will need to run rtl_tcp first, and then connect to it using the RTLSDR / TCP option in SDRSharp. This mod also enables direct sampling for rtl_tcp.