Thor 2 mW CATV RF Over Fiber Tx 45-870 MHz User Manual
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FOREWORD
This manual is applicable to the Thor Series F-RF 1310nm Transmitters for 900 MHz signals.
This guide describes the product's function characteristics, technique parameters, installation and
debugging procedures. For insuring the equipment can be successfully installed and safely work,
please carefully read the manual before using this equipment, and adhere strictly to the
prescriptive operation steps of this manual for installation and debugging. This will prevent
unnecessary damage to the equipment or harm to the operator. If there is question, please contact
Thor directly.
Special Notice:
1. The optical transmitter is professional broadcast equipment, and its installation and
debugging must be performed by special technician. Users should read this manual before
operating to prevent damage to the equipment by faulty operation or human injury.
2. There is invisible laser bean from Fiber output, which if direct shined at eyes will cause
permanent damage.
3. Earthing first before turning on the power and being sure that the rack mount and the outlet
are earthed as well (Earthing resistance should be less than 4Ω), will prevent damage to the
laser by static.
4. For insuring the equipment can work stably for the long-term, please insure that the input
voltage is of a stable waveform, in some cases it may be necessary to use a UPS power
supply to provide constant and steady power. The environmental conditions are also very
important for the longevity of the equipment. Ideal conditions are 25 degrees Celsius with
low humidity.
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1. Product Summary
Thor F-RF series laser transmitters are used to create CATV HFC networks, and primarily are
used for TV video signal, digital TV signal, telephone voice signal and data (or compressed data)
signal long-distance fiber transmission. This product uses high performance DFB laser transmitter
as the light source. Our RF drive adopts RF power digital automatic process techniques and
advanced RF pre-distortion circuit developed by our company. A built-in microprocessor
automatic monitoring system insures the system functions stably.
2. Functional Characteristics
1. Based on a high performance DFB laser with a narrow spectrum, good linearity and high
output power.
2. RF drive adopting RF power digital automatic processing techniques, can according to the
level of input RF signal and number of channels (15-84channels), automatically process drive
level power, making the C/N, CTB and CSO always in best worth, insure product function;
and be steady of output level.
3. Advance multi-frequency RF pre-distortion technique with an arsenide kalium component
drastically improves CTB and CSO, the most important parameter of CATV, and heightens
C/N at the same time.
4. Built-in microprocessor automatically monitors circuitry and can in real-time accurately
monitor optical output power and temperature of the laser to insure stable optical output
power, and prolong the working life of the laser.
5. Built-in blue VFD monitor on front panel can accurately display the equipment's working
status and parameters.
6. 19″ 1U height standard rack mount, equipped standard IEEE802.3 10Base-T Ethernet
network port and RS232 network port, can monitor equipment status in real time through the
network.
7. Support GB/T 20030-2005HFC Network control management protocol
3. Principle Drawing
4. Technique Parameter
4.1 Link path test condition
Special Note: Equipment technique parameters in this manual are given according to the test
methodology of GY/T143-2000 CATV system amplitude modulation laser transmitter and
receiver enter the net technique condition and measure method, and gained under its prescriptive
test condition.
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Item
Unit
Technique Parameter
Optical Power
mW
4 6 8
10
12
14
16
18
20
22
24
26
Optical Link Path Loss
dB
7 9 10
11
11.8
12.5
13
13.6
14
14.4
14.8
15.1
Optical Wave Length
Nm
1550±20
Type of Laser
DFB
Optical modulation mode
Direct Optical Intension modulation
Optical connector Type FC/APC, SC/APC
Frequency Range
MHz
47-750/862
RF Input Level
dBuV
72-88
Flatness In Band
dB
±0.75
RF Input Impedance
Ω
75
Input Reflection Loss
dB
≥ 16（47-550MHz）； ≥ 14（550-750/862MHz）
C/CSO
dB
≥ 60
C/CTB
dB
≥ 65
C/N
dB
≥ 51
AGC Control Range
dB
±5
MGC Control Range
dB
0-10
Power Voltage
V
AC 110V-250V（50Hz or 60Hz）
Power Consumption
W
30
Operation Temperature
℃
0 -- 45
Store Temperature
℃
-20 -- +65
Relative Humidity % Max 95% no condensation
Dimension
mm
483（L）×380（W）×44（H）
Optic
power
Optical Loss（dB）
4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
4mW
53.8
52.8
51.8
51
50.1
49.2
48.2
6mW
53.0
52.0
51.0
50.1
49.1
48.1
8mW
52.8
51.9
51.0
50.1
49.2
48.2
10mW
52.9
51.9
51.0
50.1
49.1
48.2
12mW
52.7
51.8
50.8
49.9
49.0
48.0
14mW
52.4
51.5
50.5
49.5
48.6
47.8
Test conditions:
Test link path is formed of standard fiber and standard optical receiver. Under the condition of
prescriptive link loss, set 84 PAL-D test source TV channel signals at 750MHz, when optical
receiver input optical power being -1dBm, measure C/ CTB, C/ CSO, C/ N.
4.2 Technique Parameter Table
Optical Link Path C/N Parameter:
4
16mW
52.0
51.0
50.1
49.1
48.1
18mW
52.5
51.6
50.6
49.7
48.7
47.9
20mW
51.9
51.0
50.0
49.0
48.0
22mW
52.2
51.4
50.4
49.4
48.6
47.8
24mW
51.5
50.3
49.2
48.5
47.7
26mW
51.5
50.2
49.2
48.5
47.6
5. Exterior function explanation
5.1 Front panel description
Front panel sketch map
1. Power indicator: when the power inside is working, the light is on.
2. Equipment operating indicator: equipment works: LED blinks by 1Hz frequency.
3. LD laser operating status indicator: red light shows that the laser does not work and each
parameter is normal; when the red light is flashing, it shows that this equipment is at fault.
The faulted reason can be looked up in the alarm list of the show menu. When the green light
is on, it shows that laser is working normally.
4. RF status indicator: Green light: normally operation; Red light: laser abnormity.
5. The 160×32 crystal liquid display: this displays all parameters.
6. Withdraw or cancel key.
7. Up and increase key.
8. Down and decrease key.
9. Confirmation key
10. Laser switch key: Control work status of the laser. “ON” indicate laser is turn on, “OF”
indicate laser is turn off. When powering on the unit, the key must be OFF, after power on
self test, the laser can be turned on when the display indicates the unit is ready.
11. Input RF signal Test port: -20dB RF Test Port
5.2 Back panel explanation
Back panel elucidation
1. RF input
2. RS232 interface: use for various network management parameter allocations.
3. LAN interface: match with IEEE802.3 10Base-T interface, use for network management.
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