ADTRAN TRACER 2xT1, User Manual

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TRACER 2xT1 User’s Manual
61280003L2-1B
Section 2 Installation
15
Preliminary
LINK PLANNING
I M P O R T A N T
The appropriate transmitter power must be calculated as part of the link planning.
The factors that must be taken into account when planning a link are optimal received signal level,
transmitter power, antenna feedline loss (each end), antenna gain (each end), free space path loss, and
required fade margin.
I M P O R T A N T
The optimal signal level for the receiver is -60 dBm.
Antenna Feedline Loss
Feedline loss is a function of feedline type and length. Feedline loss per 100 feet for several types of
coax at IF and RF frequencies is detailed in the table below. The IF loss applies to BBP/RFC
interconnection, and the RF loss applies to RFC/antenna interconnection. Antenna manufacturers’
specifications may vary.
IF Loss/100 feet 2.4 GHz RF Loss/100 feet 5.7 GHz RF Loss/100 feet
Cable (in dB) (in dB) (in dB)
RG58 ..................................................... 5.7 ................................... 80 ............................................ N/A
RG8 (air) ............................................... 2.7 ................................... 20 ............................................ N/A
RG8 (foam) ............................................ 2 ...................................... 9 ............................................. N/A
1 /
4
" Coax ............................................... 1.42 ................................ 5.91 ......................................... 11.36
3
/
8
" Coax ............................................... 1.25 ................................ 5.76 .......................................... 9.65
1
/
2
" Coax ............................................... 0.81 ................................ 3.83 .......................................... 6.49
7 /
8
" Coax ............................................... 0.44 ................................. 2.2 ............................................ N/A
1
1
/
4
" Coax ............................................ 0.33 ................................ 1.62 ........................................... N/A
1
5
/
8
" Coax ............................................ 0.27 ................................ 1.41 ........................................... N/A
5.8 GHz Elliptical Waveguide ............. N/A ................................ N/A .......................................... 1.23
Antenna Gain
Best performance will result from the use of a parabolic dish antenna. Antenna gain is determined by the
size of the dish, with typical figures detailed below. Dish manufacturers will be able to supply gains for
other types of antenna.
Dish Diameter 2.4 GHz Gain 5.8 GHz Gain
(in feet) (in dBi) (in dBi)
2 ....................................... 21 ................................... 28.5
4 ....................................... 27 ................................... 34.2
6 ....................................... 31 ................................... 37.5
8 ....................................... 33 ................................... 40.7
10 ...................................... 35 ................................... 42.5
12 ...................................... 37 ................................... 44.2