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The Echo transmitter has 3 separate frequency
bands:
4 kHz is most appropriate when encountering
passive interference.
Examples of objects that cause passive
interference are rebar, wire mesh, and metal
fences.
19 kHz is the midrange band and will be the
frequency used in most drilling situations.
30 kHz responds better in high active interference
situations.
To check for active interference before drilling,
use the depth forecast function.
Manual page 16
Receiver: Mag 6S
Receiver: Mag 3S
Display: Mag D6
Display: Mag D3
Transmitter: Echo 1
Echo 1 19k/30k
Echo ST
Transmitter:
Echo 1
Echo 1 19k/30k
Echo 2S
Echo 3
Echo ST
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