FS71C-85
Series
User
M anual
|
21
Copyright
©
2015
Fiber-Span
Uplink Gain Setup
To set up the uplink, the following equipment is re-
quired:
1.
RF Signal Generator
2.
Spectrum Analyzer
3.
Appropriate jumper cables
The following steps should be observed to proper set
up the link.
1.
Using your design link budget, calculate the
maximum RF Input the HRU would receive on the DAS
port. Factor ALL Channels within band of the HRU
at the lowest path loss. The maximum input power
should be less than -10 dBm. If this calculated value
exceeds -10 dBm, add additional attenuation to the
DAS port.
a.
800 MHz Free-Space Path Loss at 1 meter =
approximately 30 dB
b.
Antenna Network Loss should be about 20 dB
(sum of losses from any antenna, over the coax, and
through all passive devices)
c.
Composite power can be calculated using 10
LOG10 (n) where n = number of channels supported.
2.
Set Signal Generator to generate a CW Signal
within the Uplink band at an amplitude equal to the
value calculated above. Use this generated signal as
the input for gain measurement and verifi cation.
3.
Set gain such that output = +37 dBm by
increasing or decreasing the UPLINK ATTENUATOR in
the GUI. Uplink Bandwidth is factory set per customer’s
specifi cations.
4.
Measure and verify that the composite RF
output power at the DONOR port is approximately
+37dBm. Note: Factory limit is set to +37 dBm
composite output power. When connecting directly to
an antenna the maximum uplink antenna gain must
not exceed -2.15 dBd.
Figure 14: Uplink Control GUI Interface
