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| This modulator is named adjacent channel modulator, which is applied in CATV djacent channel transmission system, converting TV Audio/Video signal into RF signal of one fixed channel between E2 and E69.
Features |
- Applicable for 47~870MHz system, fix chancel outputting, specially designed for middle or large scale system
- LCD display: Radio Frequency, Video/Audio medium frequency, Video frequency modulating scale, Audio frequency modulating deviation, RF output level, A/V ratio, etc
- I2C Bus control
- Audio noise reduction (optional)
- Clamping and non-clamping switch, easy for Video frequency interference
- I² C Bus control
- Audio noise reduction (optional)
- Medium frequency modulating, Video/Audio medium frequency signal input, output port can be applied for interference loading for fee-paid TV system
- In accordance to adjacent frequency design, no interference between adjacent chancel
- Having RF automatic amplitude-stabilizing circuit, making front-end system becoming more stable and reliable
- RF output adopting modular amplification, ensuring RF output dynamic and parasite suppressing.
- Adopting unique diode dual-balance modulating, good linearity, low noise, modulator's indexes, such as S/N, C/N, DG, DP, have achieved internationally advanced level
- Surface mount technology, ensuring the accordance of entire machine
- Surface mount technology, ensuring the accordance of entire machine
- 19”1U standard structure, independent power supply, elegant outlook, flexible corollary equipment
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Specification |
| A. Video Index |
| 1. Video input impedance |
75ohms lotus socket |
| 2. Input level |
0.5 ~ 2.0 Vp—p |
| 3. Video modulating rate |
87.50% |
| 4. Deferential gain |
< 2 % |
| 5. Deferential phase |
< 2 ° |
| 6. Color/brightness delay |
40 ns |
| 7. Video S/N |
| >58 dB (Non coefficient added) |
| >64 dB (coefficient added) |
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| 8. Video response |
< ± 0.75 dB |
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| B. Audio Index |
| 1. Input level |
0.775 V |
| 2. Audio input impedance |
10 K (unbalance, lotus socket) |
| 3. MAX audio freq deviation |
50 KHz |
| 4. Audio pre-emphasis |
50 µs |
| 5. Frequency response |
< ± 0.5 dB |
| 6. Audio distortion |
< 1 % |
| 7. Audio S/N |
< 65 dB |
| 8. The distance between video and audio carrier |
5.50 MHz ± 500 Hz |
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| C. RF Index |
| 1. Output frequency range |
47 MHz ~ 870 MHz |
| 2. Frequency accuracy |
<5 KHz |
| 3. Total frequency deviation |
<20 KHz |
| 4. Video carrier output leve |
120 dBµV (typical value) |
| 5. Output level variable rang |
0 ~ 16 dB (0.5dB step) |
| 6. A/V ratio |
-8 ~ -22 dB (0.5dB step) |
| 7. C/N |
Around 65 dB |
| 8. RF output impedance |
75 ohms |
| 9. Spurious output suppression |
<- 60 dB |
| 10. Output return loss |
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| D. Miscellaneous |
| 1. Power supply |
220VAC +/- 10%, 50Hz, 100W |
| 2. Dimension |
44mmX482mmX360mm 1 RU Rack Mount |
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