What matters in the field: A magnetic loop is an antenna you can aim. Rotating the CHA F-LOOP 3.0 changes the relationship between its broadside response, edge-on nulls, the desired station, and local noise sources.
What the operator is controlling
The best heading is found on site because reflected signals, buildings, wiring, terrain, and polarization can move or soften textbook peaks and nulls.
Where people get into trouble
Orienting once by compass and never listening again wastes one of the loop’s most useful controls. A receive-noise null may be more valuable than a small signal peak.
A repeatable field method
Tune in the final position, rotate slowly while watching both signal and noise, mark useful headings, retune after a substantial move, and preserve clear space around the loop.
Product boundary
These F-LOOP instructions preserve the documented discontinued CHA F-LOOP 3.0 system for existing owners. They do not transfer hardware, tuning, power, or compatibility claims to the separate pre-production CHA F-LOOP 4.0.
