is optional, and where it’s not going to be installed, you need to appropriately configure the router, by disabling this
antenna, to obtain maximum performance from the router.
Connecting with an extension cable
When the
Main
and
Aux
antennas are not directly connected to the router, but are installed through extension
cables, the minimum distance between the two must be 7 cms. Maximum recommended distance is 25 cms.
For optimum performance, use the radio frequency accessories (antennas and cables) recommended by Teldat.
If you use extension cables to connect the antennas to the Teldat-3Ge , they must be H155 coaxial cables. Figure 8
and Figure 9 show you how to install them.
The following material is necessary for installation: the H155 coaxial cable, the RF antennas and the SMA connect-
ors.
Cable characteristics:
Mechanical Specifications:
Storage temperature: -40ºC to +80ºC
Operating temperature: -40ºC to +80ºC
Minimum curvature of radio: 35 mm
Total weight: 38 g/m
Electrical Specifications:
• Impedance characteristic: 50 W
• Loop resistance DC: £ 32 W /km
• Internal resistance DC conductor : £ 15 W /km
• External resistance DC conductor: £ 17 W /km
• Capacitance: 82 pF/m
• Broadcasting rate: 0.81
• Screen effectiveness 30-1000 MHz: ³ 75dB
• Return losses 5-30 MHz: ³ 22 dB*
30-470 MHz: ³ 16 dB*
• Attenuation:
Attenuation at (MHz)
Nominal (dB/100m)
5
3.0
50
6.5
100
9.3
230
14.2
300
16.3
400
19.0
470
20.7
860
28.5
1000
30.9
1350
36.4
1750
41.9
2050
45.8
As a further recommendation for this second section, when installing antennas using extension cables, if the anten-
nas are anchored the anchorage should be carried out through the male SMA connector.
Teldat S.A.
1 Installing the Router
Teldat-3Ge Installation Manual
7
