Product Manual
The 7708LT is a fiber optic transmitter for RF signals in the extended L-Band or wider frequency range. It accepts a single RF input on coaxial cable and provides a single output for optical transmission. An RF monitor output provides a convenient means of obtaining peak satellite signal strength, or additional signal distribution.
Gain may be adjusted manually or managed automatically via AGC. With SmartMON™, incoming RF signal strength, LNB current, and other data are relayed over the fiber output for monitoring through SNMP/VistaLINK® (requires SmartMON™ capable companion fiber receiver). 13/18V DC adjustable LNB power with 22kHz tone is also provided.
Features
- Extended frequency response for extended L-Band and off-air DTV signals
- Protocol independent design - transports all modulation formats
- LNB power with selectable 13/18V DC
- LNB current limit & short circuit protection
- LNB current monitoring for advance warning of LNB failure
- 22kHz tone on/off for LNB local oscillator control
- RF monitor output for signal peaking and signal distribution
- Manual gain and AGC modes
- Wide range adjustable gain in 0.5dB steps for fine tuning signal levels and optimizing CNR
- Available with 1310nm, CWDM (ITU-T G.694.2) and +11dBm high power DWDM (ITU-T G.694.1) laser options
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- The 7708LT occupies one card slot and can be housed in the 1RU 7801FR frame which holds up to four single or two dual slot modules, the 3RU 7800FR frame which has a 15 slot capacity, the portable 3RU 350FR frame which has a 7 slot capacity, or a standalone enclosure which holds a single module.
- SmartMON™ capability provides remote status monitoring via SNMP without a separate data connection
- VistaLINK® capable for remote monitoring and control via SNMP (using VistaLINK® PRO) when installed in 7800FR frame with a 7800FC VistaLINK® Frame Controller
- Fiber link provides electrical isolation between antenna and facility, mitigating ground loop and lightning issues
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Block Diagram
Specifications
| RF Input |
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| Number of Inputs | 1 |
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| Connector | BNC per IEC 61169-8 Annex A (F-Type and SMA optional) |
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| Input Impedance | 75Ω (50Ω Optional) |
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| Frequency Range |
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| 1310nm DFB Laser | 850MHz - 3000MHz |
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| CWDM or DWDM DFB Laser | 88MHz - 3000MHz |
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| Return Loss |
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| 120MHz to 2.3GHz | > 14dB |
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| 2.3GHz to 3GHz | > 12dB |
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| Input Power Range | -10dBm to -60dBm |
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| Gain Range | 0dB to +30dBm in 0.5dB steps |
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| IMD | < -55dBc at -15dBm input and 0dB gain |
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| Input IP3 | +10dBm |
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| LNB Power |
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| Voltage | 13V DC, 18V DC, off (selectable) |
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| Current | 400mA |
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| Protection | Short Circuit, current limited |
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| LO Control | 22kHz on/off (selectable) |
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| RF Monitor Output |
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| Number of Outputs | 1 |
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| Connector | BNC per IEC 61169-8 Annex A (F-Type and SMA optional) |
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| Output Impedance | 75Ω (50Ω Optional) |
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| Return Loss | > 15dB |
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| Frequency Range | 88MHz to 3000MHz |
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| Output Level | within -1.5dB of input signal |
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| Optical Output |
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| Number of Outputs | 1 |
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| Connector | Female SC/UPC, ST/UPC, FC/UPC, SC/APC, FC/APC |
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| Operating Wavelength |
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| Standard | 1310nm DFB |
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| CWDM | 1270-1610nm |
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| DWDM | C-Band (ITU G.694.1 compliant) |
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| Output Power |
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| Standard 1310nm | +2dBm |
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| CWDM | +2dBm |
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| DWDM | +11dBm |
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| RF System Performance7708LT13 + 7708LRA pair |
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| Frequency Range |
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| 950MHz to 2150MHz | ±1.5dB |
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| 120MHz to 3GHz | ±2dB |
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| 36MHz BW to 2.3GHz | ±0.25dB |
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| RF System Performance7708LT13 + 7708LR-H pair |
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| Frequency Range |
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| 950MHz to 2150MHz | ±1.5dB |
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| 120MHz to 2.3GHz | ±2dB |
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| 36MHz BW | ±0.25dB |
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| Electrical |
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| Voltage | +12VDC |
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| Power | 6 Watts max excluding LNB Power |
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| Physical |
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| Number of slots | 1 |
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| Compliance |
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| Laser safety | Class 1 laser product
Complies with 24 CFR 1040.10 and 1040.11
IEC 60825-1 |
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| EMI/RFI | Complies with FCC Part 15, Class A
EU EMC directive |
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