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User Manual May 2019 | Page 35/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
4.5
Antenna layout
4.5.1
Whip antenna (STM 330 / STM 332U)
Specification of the whip antenna; L=86 mm @ 868 MHz, L=64mm @ 902.875MHz
Antenna layout recommendation:
STM 330 without host PCB STM 330 with host PCB
Glass, wood, concrete, metal
868/902 MHz: > 2 cm
315 MHz: > 4 cm
868/902 MHz: > 1 cm
315 MHz: > 2 cm
868/902 MHz: > 2 cm
315 MHz: > 4 cm
Host PCB
GND plane
