After Sales
Technical Documentation
RAE/RAK–1N
RF
Page 3– 26
Amendment 1 04/97
Connections
Antenna
The default antenna in GSM transceiver is helix with turnable joint and in
PCN a whip antenna with turnable joint also. The location of the antenna
is in the gk2 module. The antenna signal is lead through the turnable
hinge separating the gk2 and CMTmain modules using 50W flexible
coaxial cable. The feedpoint of the antenna is matched to the 50W cable
using LC matching transformer. There is a SMD coaxial connector on the
CMT board for the cable.
Table 22. Specification of the antenna cable
Parameter Minimum Typical /
Nominal
Maximum Notes
Insertion loss GSM
PCN
0.6 dB
1.0 dB
Whole assembly in-
cluding cable and
connectors at both
ends.
V.S.W.R. GSM
PCN
1.5
1.5
Whole assembly in-
cluding cable and
connectors at both
ends.
Cable length 140 mm
The external antenna connector includes an antenna switch between the
built–in and external antennas. The nominal impedance of the external
antenna connector is 50W. The connector is located near the duplex filter
of the RF module
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