What the operator is controlling
The guide reports about 17 kHz on 40 meters as an example and provides configuration-specific typical 2:1 bandwidths. Geometry, loss, surroundings, and coupling move the actual result.
Where people get into trouble
Narrow bandwidth is not a defect by itself, and a suspiciously broad curve can indicate loss or poor coupling. Q, efficiency, match, and usable operating width must be read together.
A repeatable field method
Tune at the exact frequency using low power, make small control movements, confirm receive peak and SWR, retune after moving frequency, and investigate any abrupt change from the system’s baseline.
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.
