User's Manual

5.8GHz PDH User’s Manual
84
Appendix G: 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 dBm)
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.