For example, let's say that with the signal straight ahead, the calibration control swings the indication from 190 to 330 degrees, but can't get it to zero degrees where we want it. Now the calibration control covers the range 280 to 60 degrees for a straight-ahead signal, which includes the desired zero degree indication. Limitations of Doppler RDF Gear Many newcomers to T-hunting have unreasonably high expectations of the many available Doppler RDFs. They think that they will be unbeatable in the local T-hunts with them. They also imagine that several Doppler RDFs linked for triangulation will locate jammers with pinpoint accuracy from dozens of miles away.
Experienced hunters know that neither belief is true.
5 degrees around the circle when the unused antennas are properly floating or terminated, and far more if they're not. The readout steps are 11.25 degrees, limiting resolution. On top of all this, atmospheric effects cause additional error. This error can be 15 degrees or more, varying with time of day. It is greatest if part of the path is over land and part over water.