Calibrating low cost Software Defined Radios like the r820t

  1. Local LTE carriers are carefully frequency corrected.  You will see a quiet spot in the energy right in the center.  Example: 737,000,000 Hz
  2. TV Carriers have a ATSC pilot that is very distinct and easy to tune to.  Examples: 470,309,441 Hz and 174,306,000 Hz

ethernet > tcpdump > Linux > ssh > Windows > wireshark

Streaming a remote packet capture on a linux system over ssh to a windows system is as easy as creating a one line batch file. When wireshark opens click the "-" interface.
"C:\Program Files\PuTTY\plink.exe" -ssh -P 22 "/usr/bin/sudo /usr/sbin/tcpdump -s 0 -i enp2s0 -w - 'port not 22'" | "C:\Program Files\Wireshark\Wireshark.exe" -i - 

Should work with much older and newer of all components but tested with Ubuntu 18.04, Putty 0.70, WireShark 2.6.1, Windows 10 Pro 1803 17134.112