Foxcom SATLIGHT 7225H, Installation And User Manual

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Setting Up the Receiver
page 10 Document no. 93-005-33-B2
2.3 Setting Up the Receiver
1. Place the 7225HR Receiver in any of the 7180M Chassis, unless a
2040 RF Switch is installed. (See
Figure 8 7180M Chassis Rear View
on
page 12.).
Note
If a 2040 RF Switch(s) is being installed, then slots 2 and/or 5 of
the 7180M are reserved for the switch(es).
2. Apply AC power to the chassis. The Power Supply’s LED should
be lit.
3. On the rear panel connect the fiber optic cable from the De-Mux
to the Optical Connector. The Opt. LED should be lit (if the
Transmitter is operating correctly).
4. Using an optical power meter, measure the optical power coming
to the Receiver from the fiber optic cable. The power levels of the
Receiver should be the power level measured at the Transmitter
minus the fiber loss
4
.
Alternatively, use a DVM to measure the voltage at:
• pins J13-P7 through J10-P12 for the slot being measured
(See
Table 5 7225HR Receiver Pinout
on page 21 for details
regarding J13 pinouts) (7180M Rackmount). The voltage
level should be 1 V for each 1 mW measured at the Receiver
input.
• at pin #5 of the 9 pin connector (standalone)
5. On the rear panel, connect the coax cable to the RF Output
Connector.
6. Adjust the Gain Control Potentiometer to give the desired output
power. Using a small screw driver, turn the potentiometer
(located on the front panel) to increase or decrease the gain.
Notes
1. The potentiometer is 10 turn potentiometer.
• To
increase
the gain, turn the gain control clockwise.
• To
decrease
the gain, turn the gain control counterclockwise.
For more information see
2.7 Aligning the Fiber Optic Link
on page15 .
2. If the LED is not lit, see
Chapter 5: Troubleshooting
, on page 29.
4. Fiber loss is defined as:
(attenuation/km x length (km) of the fiber optic cable) + (1.0 dB x
number of connectors).
For example if a signal with an optical wavelength of 1310 nm is
transmitted over a link 10 kilometers long which had two connectors the
loss would be:
(0.4 dB/km x 10 km) + (0.5 dB x 2) = 5.0 dB