Q-Series
®
Optical – QFOT1L Series Optical Transmitter – Installation & Operation Manual
7-1
CHAPTER 6: FUNCTION GUIDE
CHAPTER 7: INSTALLATION & ADJUSTMENT
INSTALLATION & ADJUSTMENT
7. Installation & Adjustment
7.1. Opening the Cover
7.1.1.
Inspect the package. If the packaging has been damaged, or shows signs of water damage, please contact the freight
company or contact ATX.
7.1.2.
After unpacking, check the equipment and accessories according to packing list. If there is any question, please
contact ATX.
7.1.3.
If you think equipment has been damaged, please don’t turn on the power and avoid worse damage. Please contact ATX.
7.2. Supplies & Tools
An optical power meter
A digital multimeter
A Cable TV RF meter or spectrum analyzer
A standard fiber test jumper (FC/APC or SC/APC)
Denatured or 99% pure isopropyl alcohol and lint-free fiber optic cleaning wipes
7.3. Installation
a) Mount the transmitter in the rack and ground the case.
b) Check input voltage using a digital multimeter in accordance with power requirement. Then turn on power.
c) Connect standard fiber test cable to the transmitter’s optical signal output. Measure the output optical power and
confirm that the output optical power is the close to the value tested from Optical Power Test Port in the front panel.
(When measuring the optical power, make sure that optical power meter is set at 1310nm wavelength and that fiber
test jumper is clean.)
d) Measure the input RF signal level with a Cable TV meter or a spectrum analyzer, making sure that input RF signal
is in the range of 15 to 25 dBmV.
The recommended RF Input Level vs NTSC channel number.
Channel Number
10
20
30
40
50
60
70
80
90
100
110
Input RF (dbmV)
24
23
22
22
21
21
20
20
19
18
17
At this time, you can connect the RF signal to the RF input port of this transmitter. The front panel RF LED turns to
green.
On the front panel, there is a 5-digit manual controller which controls the built-in digital RF attenuator. The
attenuation value is:
Digit
1
2
3
4
5
ON
0
0
0
0
0
OFF
1 dB
2 dB
4 dB
8 dB
16 dB
The total attenuation number is the sum of all 5 digits.
For example, “10101” represents MGC value of “0+2 dB+0+8 dB+0=10 dB”.
Since the effective MGC range is 15 dB, it is recommended that 5th digit should be kept in the “ON” position while
the first 4 digit combinations give the value from 0 dB to 15 dB.
