SS-15 BRI (ISDN 2 GSM) USER MANUAL
DOC. NO: SS-15-14 (REV. 01)
Page 10 of 26
other kinds of external antennas with higher gain or directivity (Yagi), if the
need arises.
The following table shows the main characteristics of the dual-band stick
antennas with magnetic base (currently supplied with the SS-15 BRI (ISDN 2
GSM) package).
Frequency bands
GSM 890-960 MHz
PCN 1710-1880 MHz
PCS1850-1990 MHz
Gain
2 dBi
Polarization
Vertical
Base
Magnetic, 2,8cm
Cable
Type RG174, length
2,5 m
Connector
Female FME
The two antennas must be threaded to the FME male connectors located on
top of the SS-15 ISDN 2 GSM unit, as shown in the following drawing.
Figure 4. Connecting external antennas.
Plug the cable connector and tighten the flange lightly, by hand.
Do NOT use a spanner or screw key, which could damage the antenna
connectors.
The external antennas must be installed in a place with a good GSM signal
strength. The antenna has vertical polarization; it must be placed in vertical or
horizontal position, depending of the local field condition.
If the SIM cards used are for different GSM operators, it may be necessary to
place each antenna in a location with maximum strength of the received signal
from the respective GSM carrier.
SS-15 BRI (ISDN 2 GSM) and its antennas must be located as far as possible
from equipment that is sensitive to electromagnetic interferences (radios, audio
or video appliances, computer monitor, TV receivers etc). If placing the SS-15
