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860MHz Demodulator Of TV Signal
1. Summary
Advanced phase locked loop oscillating technology, surface acoustic intermediate frequency modulation technology and amplifying circuits are used in Luxury Adjacent Channel Modulators. Automatic Control Systems are used to monitor working status. Working status will de displayed on LCD of front panels. It's the best choice for large and medium-sized CATV systems because of its excellent performances and beautiful shape.
2. Performance Characteristic
N Automatic control intermediate frequency modulation technology and phase locked loop oscillating circuits are adopted to improve frequency stability.
N Surface Acoustic Wave Filters, Frequency Mixers of 1.9GHz and spiral Band Pass Filters are adopted to improve out-off-band rejection characteristics.
N There are audio / video and intermediate frequency circuits input-output interfaces.
N Modulators get the functions of program memory and Power On Self Test with Microcomputer Systems.
N Advanced amplification circuits result in good RF output indicators and output level of over 110dBμ V.
N Two lines 20-bit LCD display is on front panel to display the parameter indices on time. The vision signal modulation, audio deviation, A/V ratio and output level can be adjusted on the front panel.
1. Summary
Advanced phase locked loop oscillating technology, surface acoustic intermediate frequency modulation technology and amplifying circuits are used in Luxury Adjacent Channel Modulators. Automatic Control Systems are used to monitor working status. Working status will de displayed on LCD of front panels. It's the best choice for large and medium-sized CATV systems because of its excellent performances and beautiful shape.
2. Performance Characteristic
N Automatic control intermediate frequency modulation technology and phase locked loop oscillating circuits are adopted to improve frequency stability.
N Surface Acoustic Wave Filters, Frequency Mixers of 1.9GHz and spiral Band Pass Filters are adopted to improve out-off-band rejection characteristics.
N There are audio / video and intermediate frequency circuits input-output interfaces.
N Modulators get the functions of program memory and Power On Self Test with Microcomputer Systems.
N Advanced amplification circuits result in good RF output indicators and output level of over 110dBμ V.
N Two lines 20-bit LCD display is on front panel to display the parameter indices on time. The vision signal modulation, audio deviation, A/V ratio and output level can be adjusted on the front panel.
| Item | Unit | Technique Parameter |
| RF Parameter | ||
| Output Frequency Range | MHz | 47 ~ 866.25 |
| Maximum Output Level | dBμV | 92 ~ 115 |
| Output Level Range | dB | 20 |
| V/A Power Ratio | dB | -13 ~ -20 |
| Out-of-band Output Suppression | dB | -62 |
| Frequency Stability | KHz | ±3 |
| Output Impedance | Ω | 75 |
| Output Return Loss | dB | ≥ 16 |
| Video Parameter | ||
| Input Level | Vp-p | 1 @87.5% |
| Differential Gain | % | ≤ 5 @87.5% |
| Differential Phase | ° | ≤ 5 @87.5% |
| C/L Delay | ns | ≤ 45 |
| Vidio Modulation | dB | 72.5 ~ 90 ( 87.5 TYP ) |
| Vision Mid Frequency | MHz | 38 |
| Vidio to Noise Ratio | | ≤ 60 |
| Video Frequency Response | dB | ±0.75 MAX |
| Audio Parameter | ||
| Input Level | Vp-p | 0.4 ( ±50 KHz ) |
| Output Impedance | KΩ | 10 ( Unbalance ) |
| Distortion | % | ≤ 0.4 |
| Audio with Frequency | MHz | 4.5 , 5.5 , 6.0 , 6.5 |
| 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 | ≤ 10 |
| Dimension | mm | 483 ( L ) × 255 ( W ) × 44 ( H ) |