Programming instructions

Designer’s Guide 65
Calsense
Spread Spectrum Radio Filter (model SR-FILTER)
The Calsense Spread Spectrum Frequency Filter (model SR-FILTER) is a bandpass filter used to help
prevent interference from unwanted frequencies by filtering them out. It is required when using a SR-
STICK antenna and recommended when using an SR-YAGI.
Figure 39 - Spread Spectrum Radio Filter
Antenna Cable Surge Protector (model ANT-PROT)
The Calsense Antenna Cable Surge Protector (model ANT-PROT) helps protect the radio equipment and
the radio frequency (RF) filter from lightning strikes. An ANT-PROT is required when using a GR-STICK, LR-
STICK, or SR-STICK antennas and recommended when using an LR-YAGI or SR-YAGI.
Figure 40 - Antenna Cable Surge Protector