Specifications

SB-P-06-4066
sepura
Mobile & Gateway Accessory i/f
specification
30th July 2012
Page 36 of 39
Issue 7c
© Sepura plc 2011
GPS ANTENNA
CONNECTOR DETAILS
Type: SMC female (on the radio).
SIGNAL DETAILS
Notes:
The GPS circuitry within the SRM/G will operate with a passive antenna. However due to
cable loss an active antenna with LNA gain between 20dB and 30dB is advised to counter the
cable loss. Sepura supplied GPS antennas have an LNA gain of 26dB to counter a 5dB loss
in 5m coax cable.
Active antenna‘s draw 5V dc at up to 40mA.
Pin
Signal
Name
Signal Function
Signal Function &
Signal Characteristics
Centre
GPS_ANT
GPS RF input and
active antenna DC
feed
Vnom.5V
I max.40mA
Internally protected against external short
circuits to ground.
RF input from GPS antenna = 1575.42 MHz
(L1 Band) at a level between –135 dBm and –
152 dBm into a 50 Ω impedance.
LNA gain see note 1 below
Outer
GND
Ground return
Ground