Summary
 

SA812C1/SA812C2 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.

 

 

 

●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 SA812C1.）

●PHILIPS return amplifier modules are used as backward path. Its distortion is little and SNR is high.

●It is 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.

 

 

Block Diagram




Technique Parameter

Item		Unit	Technique Parameter
			SA812C1-XX			SA812C2-XX
Downlink Transmission Path
Frequency Range		MHz	53/85~862			53/85~862
Rated Gain		dB	OUT1：≥36 OUT2：≥36 (FP-204 Output)	OUT1：≥40 OUT2：≥30 (FZ-110Output)		≥38
Minimum Full Gain		dB	≥36			≥38
Rated Input Level		dBμV	72
Rated Output Level		dBμV	106/108		108
Flatness in Band		dB	±0.75
Noise Figure		dB	≤10
Return Loss		dB	≥16
Attenuation Range		dB	1-18（Fixed insert,1dB stepping）
Equilibrium Range		dB	1-15（Fixed insert,1dB stepping）
C/CTB		dB	≥67（Note 1）
C/CSO		dB	≥69（Note 1）
AGC Pilot Carrier Frequency		MHz	168.25（Or up to users）
AGC Characteristic		dB	±4（Input）/±0.5（Output）
Group Delay		ns	≤ 10  (112.25 MHz/116.68 MHz)
Signal to Hum Ratio		%	< 2
Gain Stability		dB	-1.0 ~ +1.0
Uplink Transmission Path
Frequency Range		MHz	5 ~ 42/65
Rated Gain		dB	OUT1：≥20 OUT2：≥20 （FP-20 Output）	OUT1：≥22 OUT2：≥12 （FZ-11 Output）		≥20
Minimum Full Gain		dB	≥20	≥22		≥20
Maximum Output Level		dBμV	≥110
Flatness in Band		dB	±0.75
Noise Figure		dB	≤12
Return Loss		dB	≥16
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)
Group Delay		ns	≤ 20  (57MHz/59MHz)
Signal to Hum Ratio		%	＜2
General Characteristic
Characteristic Impedance	Ω		75
Test Interface	dB		-20±1
Supply Voltage	V		A：AC（135 ~ 250）V；B：AC（35 ~ 90）V
Impulse Withstand  Voltage（10/700μs）	kV		> 5
Power Consumption	W		≤25			≤30
Dimensions	mm		250（L）* 205（W） * 125（H）			290（L）*220（W）* 125（H）