CATV headend modulator Adjacent Channel CATV Agile Modulator

It's easier to operate, because of the digital channel number of front panel, the uplink of back panel, memory channels and powe

1. Description

SNP-78 Adjacent Channel Agile Modulator is headend equipment for adjacent channel modulation of image and acoustical signals. Carrier frequency of output signal can be changed with internal phase-locked loop local oscillator circuits controlled by microcomputers. Medium frequency treatment technique and phase locked loop technology are adopted to improve frequency stability and reduce signal distortion. It's the best choice for large and medium-sized CATV systems.

2. Feature

1. Medium frequency treatment technique and dual-phase locked loop technology for CPU control are adopted to improve frequency stability.

2. Number of output channels are within the limit of

48~550/750/870MHz.Standard channels and added channels were installed.

3. Carrier frequency or each channel is within the limit of 48~550/750/870MHz.4 standards of sound carrier frequency: 4.5, 5.5, 6.0, 6.5MHz.

4. The vision signal modulation, audio deviation, A/V ratio and output level can be adjusted on the front panel.

5. Independent RF Power Amplifiers are inside. The output level is up to over 110dBμV.

6. It's easier to operate, because of the digital channel number of front panel, the uplink of back panel, memory channels and power failure memory function.

7. Output power of B machine is 48~550MHz.Output power of C machine is 48~750MHz.Output power of D machine is 48~870MHz.

8.Two lines 20-bit LCD display is on front panel. Add medium frequency interfaces.

3. Technique Parameter

Item	Unit	Technique Parameter
		SNP-78B	SNP-78C	SNP-78D
RF Parameter
Output  Frequency Range	MHz	47 ~550	550 ~750	47 ~ 866.25
Maximum Output Level	dBμV	≥ 110	≥ 110	≥ 110
Output Level Range	dB	20	20	10
V/A Power Ratio	dB	-13 ~ -20	-13 ~ -20	-13 ~ -20
Out-of-band Output Suppression	dB	-60	-60	-65
Frequency Stability	KHz	±3	±3	±3
Output Impedance	Ω	75	75	75
Output Return Loss	dB	≥ 16	≥ 16	≥ 16
Video Parameter
Input Level	Vp-p	0.7~1.4	0.7~1.4	0.7~1.4
Differential Gain	%	≤ 3 @87.5%	≤ 3 @87.5%	≤ 4 @87.5%
Differential Phase	°	≤ 3 @87.5%	≤ 3 @87.5%	≤ 4 @87.5%
C/L Delay	ns	≤ 45	≤ 45	≤ 40
Vidio Modulation	dB	87.5 TYP	87.5 TYP	87.5 TYP
Vision Mid Frequency	MHz	38	38	38
Vidio to Noise Ratio		≤ 60	≤ 60	≤ 60
Vidio Frequency Response	dB	±0.75 MAX	±0.75 MAX	±0.75 MAX
Audio Parameter
Input Level	Vp-p	0.4(±50 KHz)	0.4(±50 KHz)	0.7(±50 KHz)
Input Impedance	KΩ	0.6(Unbalance)	0.6(Unbalance)	10(Unbalance)
Distortion	%	≤ 0.6	≤ 0.6	≤ 1
Audio with Frequency	MHz	4.5,5.5,6.0,6.5 optional
Pre-emphasis	μSEC	50
Vidio to Noise Ratio	dB	≥ 55
Vidio Frequency Response	dB	±0.5
General Characteristic
Supply Voltage	V	AC 180 ~ 250 ( 50Hz )
Power Consumption	W	≤ 8
Dimension	mm	483(L)× 210(W) × 44(H)	483(L)× 210(W) × 44(H)	483(L)× 250(W) × 44(H)

4. Ordering Guide

Please sure:Operating Frequency Range

CATV headend modulator Adjacent Channel CATV Agile Modulator