User's Manual

61280.003L1-1B PAGE 21
4/12/99
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 RF Loss/100 feet
Cable (in dB) (in dB)
RG58 ......................... 5.7 ................................ 80
RG8 (air)................... 2.7 ................................ 20
“Aircell” .................... 2.4 .............................. 11.55
RG8 (foam) ................. 2................................... 9
“Aircomm” ............... 1.37 .............................. 6.55
1
/
4
" Waveguide ......... 1.42 .............................. 5.91
3
/
8
" Waveguide ......... 1.25 .............................. 5.76
1
/
2
" Waveguide ......... 0.81 .............................. 3.83
7
/
8
" Waveguide ......... 0.44 ............................... 2.2
1
1
/
4
" Waveguide ...... 0.33 .............................. 1.62
1
5
/
8
" Waveguide ...... 0.27 .............................. 1.41
INSTALLATION