Western multiplex Lynx 2xE1 - RSL Calculation and Link Budget

INSTALLATION AND MAINTENANCE MANUAL
LYNX E1 FAMILY
LICENSED & SPREAD SPECTRUM RADIOS
JUNE 2001
PAGE 3-32 SECTION 3: INSTALLATION & ADJUSTMENTS
3.3.3 RSL Calculation and Link Budget
The received signal level (RSL) can be estimated using the following formula:
RSL (dBm) = P
out
- FL
1
+ G
1
+ G
2
- FL
2
- L
p
where: P
out
is the transmitter output power (in dBm)
FL
1
is the feeder loss of the transmit side (in dB)
G
1
is the gain of the transmit antenna (in dB)
G
2
is the gain of the receive antenna (in dB)
FL
2
is the feeder loss of the receive side (in dB)
L
p
is the Path loss, defined by:
L
p
(dB) = 96.6 + 20 log
10
F + 20 log
10
D
where: F = Frequency in GHz (1.5, 2.4 or 5.8)
D = Distance of path in miles
This link budget is very important for determining any potential problems during installation. If you
have calculated the expected RSL, you can see if it has been achieved during installation, and
troubleshoot if necessary.
In the USA, 5.8 GHz models of the Lynx may be installed with
any size directional antennas and operated at full power. The
2.4 GHz model may require power reduction where: P
out
- FL
1
+
G
1
is replaced by 30 - [(G
1
- 6)/ 3] + FL
1
In some countries effective isotropic radiated power (EIRP)
limits apply, such as +6 dBW (+36 dBm) in Canada. Output
power may need to be reduced, and the above path planning
equation changed such that: EIRP (dBm) = P
out
+ G
1
- FL
1