Bidirectional Amplifier
MLE-02-1G CATV Bidirectional Amplifier
MLE-02 is kind of bidirectional amplifier with one input port and one output port, which forward gain range from 28dB to 41dB and the max gain of reversed path can reach 23dB. It can be used as a trunk amplifier in the traditional coaxial network, also it can be used as an line extender amplifier in the HFC network. Its tank-type construction is convenient for maintenance.
MLE-02 adopts two-stage GaAs module in forward path, which gain ranges from 28dB to 38/41dB, so it can be applied widely. The working voltage ~60V is fed by cable, and the working AC voltage is 35V~90V, so both of the input and output port can feed the next amplifier. MLE-02 can be set as unidirectional mode, and upgrade to bidirectional mode in the future.
MLE-02 contains RF amplifier hybrid and power supply. The water-proof aluminum casting housing is suitable for outdoor operation. Various components and options can meet many different requirements.
The power supply of MLE-02 is SMPS (Switching Mode Power Supply), which is fixed in the bottom half of the tank. The input voltage is ~35~90V, and the working bandwidth is 47~63MHz. The output voltage is +24V. The DC output current can reach 1.5A.
Features of CATV Bidirectional Amplifier
5-1002MHz, bidirectional
Output slope and reversed equalizer can be debugged by fixed attenuator, 1dB stepping
Frequency of the diplexer can be specified
GaAs module
35V-90V power supply
Max overcurrent capability 15A
MTBF>50000hours
Specifications
|
No |
Item |
Forward |
Reversed |
Remark |
|
1 |
Frequency(MHz) |
54/105/258~1002 |
5~42/87/204 |
According to the split frequency |
|
2 |
Flatness(dB) |
±0.6 |
±0.5 |
|
|
3 |
Return Loss |
≥16(FH～750MHz) ≥14(751～1002MHz) |
≥16 |
|
|
4 |
Nominal Gain |
28～38/41 |
0/20 |
|
|
5 |
Min Full Gain |
≥42 |
≥22 |
|
|
6 |
Equalization/Analog |
3～21/0～12 |
0～16 |
Forward 1.5dB step, reversed 1dB step |
|
7 |
Forward Slope Output |
14dB(54M-1002M) |
null |
|
|
8 |
Noise Figure(dB) |
＜8 |
||
|
9 |
AGC Range |
±3dB (Broadband mode, output level change 0.3dB) |
Forward |
|
|
10 |
Forward Level |
38dBmV～50dBmV |
||
|
11 |
Test Port Level(dB) |
-20±1 |
||
|
12 |
Test Port Frequency Respond(dB) |
±1 |
||
|
13 |
Working Voltage(V/DC) |
+24 |
||
|
14 |
HUM(dB) |
≥66 |
||
|
15 |
AC Input(V/AC) |
~35-90V |
||
|
16 |
AC(A/AC) |
15 |
Max continuous over current |
|
|
17 |
Level Adjustment(dB) |
0～20 |
1dB step |
|
|
18 |
Connector |
5/8 inch 24-tooth Connector |
||
|
19 |
Input/Output Resistance(Ω) |
75 |
||
|
20 |
C/CSO(dB) |
63 |
- |
110 NTSC channels + 22 10dB low QAM signal, 48 dBmV (750MHz), 14dB slope output, 10dB(54M～750M) |
|
21 |
C/CTB(dB) |
65 |
- |
|
|
22 |
Working Temperature(%) |
-25℃～+55℃ |
||
|
23 |
Power Consumption |
25W |
||
|
24 |
Storage Temperature |
-40℃～+70℃ non-condensation |
||
|
25 |
Dimension(mm) |
320L×200W×100H |
||
|
26 |
Weight(kg) |
Max 2kg |
||
|
27 |
Shell Waterproof |
IP67 |
||
Forward Path
MLE-02 can be divided into forward path and reversed path. The forward input contains cable equalizer (simulator) and fixed attenuator. The EQ range of the cable equalizer (simulator) is 3~21dB/0~12dB, 1.5dB/step. Equalizer (simulator) is used to compensate the attenuation of different frequency in transmission and correct the forward input level. Attenuator is used to adjust the forward input level to suitable value.
In forward path, it adopts two-stage amplify hybrid and provide 28~41Bm gain. The bandwidth is 54/87/105/258～1002MHz. It adopts low-noise push-pull or GaAs module in first stage to pre-amplify the input signal and double-power GaAs module in latter stage to ensure the minimum non-linear distortion when output high level. Between two-stage amplify modules, there are attenuators, frequency correction circuit and equalizers. The installation of equalizers is same as fixed attenuators, and it can be changed according to the requirement. The circuit between two-stage modules is to adjust the forward output gain and RF output slope.
The forward equalizer contains build-in 6dB fixed equalizer circuit and changeable equalizer circuit made up of fixed attenuator and peripheral circuit, ensuring the amplifier gaining certain equalization output.
There are -20dB test port for both input and output port. It adopts directional coupling mode and operate without external 75Ω load.
Reversed Path
The reversed bandwidth of MBC-02 begins from 5MHz, and various ended frequency (42/65/85/204MHz) are available for choice. The input attenuators, low-pass filters, reversed amplifier module and equalizers are pluggable, which is convenient to change. There are fixed attenuators at output port and reversed amplify gain is adjusted by output attenuator RATT (Gain). If the reversed signal does not require amplify, user can choose pass-through mode.
Reversed equalizer circuit is made up of fixed attenuator and external circuit to realize 0-16dB equalization. The reversed equalizer is used to compensate the cable loss among the reversed output, reversed input of next amplifier and the duplexer. To meet the equalization requirement, user can plug fixed attenuators in REQ position:
Note: Reversed equalizer circuit adopts pedestal design, classify the specification by reversed end frequency. REQ pedestal with different frequency can be changed to change the splitting frequency of the amplifier.
There is a -20dB test point at both of input and output port of the reversed path. The test point works in directional coupler mode, without external 75Ω load.
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