Page 28
01/2007
AMT/PTD/PBX/0020/2/4/EN
The internal antenna comprises an MMS connector (1), a KX21 coaxial cable (2) and a
radiating element (3).
The external antenna is connected using a cable (4-5-6) comprised of a male MMS connector
(4), a KX21 coaxial cable (5) and a female TNC connector (6). Radiall gives losses of less
than one dB (guaranteed). In fact, these losses are approximately 0.7 dB at 2 GHz.
The extension lead that carries the signal to the antenna is made up of a male TNC connector
(7), a low-loss RG58cu coaxial cable (8) and a male N connector (9). The antenna (11) is
attached to the extension lead via a female N connector (10).
The losses introduced by this extension lead are given in the following table:
Table 4: Losses generated by an external antenna extension lead
The maximum length of the extension lead is approximately 2.8 meters.
This extension lead ensures identical performance of the "Internal antenna" and "External
antenna" configurations when the MA431X23 antenna is used (polarisation diversity is not
identical).
The MA431X24 antenna yields a gain of 2 dB more than the "Internal antennas".
Connecting an external antenna
•
Remove cables 2 and 3.
•
Remove plate 1.
•
Fasten the cable(s) to the ANT1 and/or ANT2 external antenna connectors.
If only one external connector is connected, this should be ANT1 rather than ANT2.
•
Connect the external antennas (BNC connectors).
•
Specify the choice of antenna via the base station MMC.
"Antenna selection" -----> Antenna 1
CAUTION:
For safety reasons, fit a lightning conductor on the base station and ISDN if the latter is
outside (12).
Items
Loss @ Freq
Estimated loss
RG58cu
0.65 dB/meter at 2 GHz
0.6 dB
TNC
0.2 dB/meter at 9 GHz
0.1 dB
N
0.15 dB/meter at 10 GHz
0.1 dB
Summary of Contents for NeXspan C
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Page 70: ...Page 70 01 2007 AMT PTD PBX 0020 2 4 EN Figure 4 2 Bottom view of the LD4 ST card...
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