User`s guide

7410F IFL Installation and Users Guide Installation
Foxcom Proprietary Information 19
Document No. 93-006-01-A
3.3 Setting Up the Receiver
1. Place the 7410FR Receiver in the 7180M Chassis, unless a 2000 RF
Switch is installed (refer to Figure 7, page 21). The operating base plate
temperature must be between -10° C to 55° C.
Note
If a 2000 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. Using an optical power meter, measure the optical power coming to the
Receiver from the fiberoptic 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-P9 through J13-P16 for the slot being measured (Refer to
Table 6 page 34 for details regarding J13 pinouts) (7180M
Rackmount). The voltage level should be 1V for each 1 mW measured
at the Receiver input.
• at pin #5 of the 9 pin connector (standalone)
4. On the rear panel connect the fiberoptic cable to the Optical Connector.
The Opt. and RF LEDs should be lit.
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.
Note
If either LED is not lit, refer to Troubleshooting on page 36.
Note
The potentiometer is 10 turns potentiometer.
• To increase the gain, turn the potentiometer clockwise.
• To decrease the gain, turn the potentiometer counterclockwise.
For more information refer to Aligning the Fiberoptic Link on page 24.
4
Fiber loss is defined as:
(0.4 dB/km x length (km) of the fiberoptic cable) + (0.5 dB x number of connectors).
For example if a link was 10 kilometers long and had two connectors the loss would be:
(0.4 dB/km x 10 km) + (0.5 dB x 2) = 5.0 dB.