Fisher Labs F75 User Manual

23
FREQUENCY SHIFTING
One disadvantage of a highly sensitive metal detector is its susceptibility to electrical
interference from other electronic devices. If the detector chatters while the searchcoil is
not in motion, the cause is either electrical interference or internal circuit noise due to a
high sensitivity setting. If the detector chatters or emits intermittent false signals in the
field, you are also probably experiencing electrical interference. If you suspect electrical
interference, you may change the F75’s operating frequency. This is a trial and error
method to try to find a frequency different from the suspected source.
To shift frequencies:
1. Hold the MENU button down. Do not release the button.
2. Push the trigger forward to decrease the frequency
Or pull the trigger back to increase the frequency.
Each frequency change requires a push of the MENU button.
Each actuation will shift the frequency by one value.
The LCD will display the frequency, from F1 to F7. F1 is the lowest frequency. The
default frequency is F4. The F75 will retain any change in the frequency setting, even after
powered off.
See the Search Techniques section of this manual for more information on electrical
interference.

Fisher Labs F75 Specifications

General

Brand	Fisher Labs
Model	F75
Category	Metal Detector
Language	English