DN200 User Manual Rel 1.0
1.1.2 Sample Calculations on EIRP
Frequency
(GHz)
Permitted Use
P-to-P
Transmitter
Max Power
Output
P-
TO
-P
EIRP Max
(gain+power)
P-to-MP
Transmitter
Max Power
Output
P-
TO
-MP
EIRP Max
5.15-5.25
Indoor-
Integrated
antenna
50mW
(17dBm)
200mW
(23dBm)
50mW
(17dBm)
200mW
(23dBm)
5.725-5825
Outdoor
1W
(30dBm)
200W
(53dBm)
1W
(30dBm)
4W
(36dBm)
If EIRP exceeds the legal limit as demonstrated in this table, transmitter output power
must be
decreased
to bring EIRP within legal constraints. For example, if you deploy a point to multi-point
antenna on frequency 5.745GHz with a 10dBi gain, you must decrease the transmitter output power to
4dBm. Note: Some channels only operate at 20MHz channel width (HT20), while others can operate at
40MHz channel width (HT40). The HT40 channels will provide a higher throughput.
NOTE: IT IS HIGHLY ADVISED THAT A PROFESSIONAL FREQUENCY MANAGEMENT PLAN
IS IMPLEMENTED, TO ENSURE MAXIMUM SPECTRAL EFFICIENCY. DATASAT
TECHNOLOGIES CAN PROVIDE SUCH A PLAN IF REQUIRED.
1.1.3 Sample Point-To-Point Link Budget
A 5GHz sample link budget is shown. A 2.4GHz budget should also be conducted keeping in mind 1.1.1
Parameter
INPUT VALUES
Units Source, notes
Transmitter
Power
16 dBm
manufacturers data, may vary with the number of Tx
antennas used. (The DN200 can be used at 20dBm,
based on local regulatory laws)
Transmit cable
loss
-2.5 dB
from cable data. Typically in dB/100ft. Loss = length (ft)
x loss/100 Shown as a -ve dB gain.
Transmit antenna
gain
10 dBi
antenna data. In a MIMO array the gain of the main
(centre) antenna in the directions of the co-polar
receive antenna should be used. The dBi unit = gain rel
to isotropic antenna. Antenna gain may also be quoted
in dBd (gain rel to dipole) in which case add 2.2 dB to
get the gain in dBi
Transmitter EIRP
23.5 dBm
CALCULATED
EIRP = Tx power +cable loss (-dB) +
antenna gain