Outdoor 2 Way RF 38dB High Gain Bidirectional Cable TV CATV Trunk Line Distribution Signal Amplifier with Return Path
5-870MHz 2 Output 38dB High Gain Outdoor Bidirectional CATV Trunk Line Signal Distribution Amplifier with AGC Control and Return Path
Product description
SNP8238C, SNP8238C Field Bidirectional AGC Amplifier is a new high gain amplifier. Adopt optimized circuit design and scientific and rational process. High performance AGC control circuit inside is useful for stable gain and low distortion. It's the best choice for large and medium-sized bidirectional CATV transmission network.
Product feature
PHILIPS or NEC low noise push pull amplifier modules or GaAs push pull amplifier modules are used as forestage of forward path. PHILIPS or NEC Power-Double gallium arsenide amplifier modules or GaAs amplifier modules are used as output stage. Output level is stable and nonlinear index is good.
(Power-Double gallium arsenide amplifier modules or GaAs amplifier modules are independent in SNP8238C.)
PHILIPS return amplifier modules are used as backward path. Its distortion is little and SNR is high.
It’s more convenient to debug, because of plug-in (or adjustable) duplex filters, plug-in fixed (or adjustable) equalizers, plug-in output splitters and scientific and rational on-line detection ports.
Optimal AGC control circuit cause precise control and steady link signal.
The equipment can work steadily outdoor under bad environmental condition, because of waterproof aluminum case, high reliability switching power supply and lightning protection system.
Technique index
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Item |
Unit |
Technique Parameter |
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SNP8238C-X |
SNP8338C-X |
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Downlink Transmission Path |
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Frequency Range |
MHz |
53/85~862 |
53/85~862 |
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Rated Gain |
dB |
OUT1: ≥38 OUT2: ≥36 FP-204 Output |
OUT1: ≥40 OUT2: ≥30 FZ-110 Output |
OUT1: ≥38 OUT2: ≥38
|
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|
Minimum Full Gain |
dB |
≥36 |
≥38 |
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Rated Input Level |
dBμ |
72 |
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|
Rated Output Level |
dBμ |
106/108 |
110/110 |
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Flatness in Band |
dB |
±0.75 |
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|
Noise Figure |
dB |
≤10 |
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|
Return Loss |
dB |
≥16 |
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|
Attenuation Range |
dB |
1-18 (Fixed insert, 1dB stepping) |
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Equilibrium Range |
dB |
1-15 (Fixed insert, 1dB stepping) |
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|
C/CTB |
dB |
≥67 (Note 1) |
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|
C/CSO |
dB |
≥69 (Note 1) |
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|
AGC Pilot Carrier Frequency |
MHz |
168.25 (Or up to users) |
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|
AGC Characteristic |
dB |
±4 (Input) / ±0.5 (Output) |
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|
Group Delay |
ns |
≤ 10 (112.25 MHz / 116.68 MHz) |
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|
Signal to Hum Ratio |
% |
< 2 |
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|
Gain Stability |
dB |
-1.0 ~ +1.0 |
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|
Uplink Transmission Path |
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|
Frequency Range |
MHz |
5 ~ 42/65 |
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|
Rated Gain |
dB |
OUT1: ≥20 OUT2:≥20 FP-20 Output |
OUT1: ≥22 OUT2: ≥12 FZ-11 Output |
≥20 |
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Minimum Full Gain |
dB |
≥20 |
≥22 |
≥20 |
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|
Maximum Output Level |
dBμ |
≥110 |
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|
Flatness in Band |
dB |
±0.75 |
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|
Noise Figure |
dB |
≤12 |
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|
Return Loss |
dB |
≥16 |
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|
Carrier to Second-order Inter-modulation Ratio |
dB |
≥ 52 (Test Condition: Output level is 110dBuV, measurement point F1=10MHz, F2=60MHz, F3=f2-f1=50MHz) |
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|
Group Delay |
ns |
≤ 20 (57MHz / 59MHz) |
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|
Signal to Hum Ratio |
% |
<2 |
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|
General Characteristic |
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Characteristic Impedance |
Ω |
75 |
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Test Interface |
dB |
-20±1 |
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Supply Voltage |
V |
A: AC (135 ~ 250)V, B: AC (35 ~ 90)V |
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Impulse Withstand Voltage (10/700μs) |
kV |
> 5 |
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|
Power Consumption |
W |
≤25 |
≤30 |
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Dimensions |
mm |
250(L)*205(W)*125(H) |
290(L)*220(W)*125(H) |
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Special Notice:
The performance parameters of this manual according to GY/T 184-2002 <Specifications and methods of measurement on analog optical fiber amplifiers used in CATV system>.
We get it under the following testing environment.
Testing Environment:
There should be 79 ways PAL-D television signals in the frequency of 750MHz (112.25~743.25MHz) and 93 ways PAL-D television signals in the frequency of 862MHz (112.25~855.25MHz) when test the C/CTB and C/CSO.
There should be 3 frequencies as f1=65MHz, f2=63MHz and f3=57MHz when test the “Maximum Output Level” of uplink transmission paths.
There should be 3 frequencies as f1=10MHz, f2=60MHz and f3 =50MHzwhen test the of “Carrier to Second-order Inter-modulation ratio” uplink transmission paths in the level of 110 dBμV.
Ordering Guide
Please check: uplink and downlink crossover frequency of bidirectional paths and frequency of AGC pilot signals.
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