Editing Direction finding (section)

==== Early receivers ====
Early microwave receivers were usually simple "crystal-video" receivers,<ref name = Wiley>Wiley R. G., ''Electronic Intelligence: The Interception of Radar Signals'', Artech House, 1985</ref>{{rp|169}}<ref name=Lipsky/>{{rp|172}}<ref>Lipkin H.J., "Crystal-Video Receivers", MIT Radiation Series Vol 23, Microwave Receivers, Chapter 19 pp.504-506.  Find at:  https://archive.org/details/MITRadiationLaboratorySeries23MicrowaveReceivers</ref> which use a crystal detector followed by a  video amplifier with a compressive characteristic to extend the dynamic range.  Such a receiver was wideband but not very sensitive.  However, this lack of sensitivity could be tolerated because of the "range advantage" enjoyed by the DF receiver (see below).