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L-Band/Wideband RF Fiber Transmitter Series

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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.


  • Extended frequency response for extended L-Band, off-air DTV, and other signals
  • Protocol independent design - transports all modulation formats
  • LNB power with selectable 13/18V DC
  • LNB current limit and 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
  • SmartMON™ capability provides remote status monitoring via SNMP without a separate data connection
  • VistaLINK® capability is available for monitoring and control when modules are used in a 3RU 350FR, 7800FR frame and a 7700FC VistaLINK® frame controller is installed in Slot 1 of the frame
  • Fiber link provides electrical isolation between antenna and facility, mitigating ground loop and lightning issues
  • 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.


RF Input

Number of Inputs 1
Connector BNC per IEC 61169-8 Annex A (F-Type and SMA Optional)
Input Impedance 75Ω (50Ω Optional)
Frequency Range 50 – 3000MHz
Return Loss
120MHz – 2.3GHz > 14dB
2.3 – 3GHz > 12dB
Input Power Range -10dBm to -60dBm
Gain Range 0 to +30dBm in 0.5dB steps
IMD < -55dBc at -15dBm input and 0dB gain
Input IP3 +10dBm
LNB Power
Voltage 13V DC, 18V DC, off (selectable)
Current 400mA
Protection Short Circuit, current limited
LO Control 22kHz on/off (selectable)

RF Monitor Output

Number of Outputs 1
Connector BNC per IEC 61169-8 Annex A (F-Type and SMA Optional)
Output Impedance 75Ω (50Ω Optional)
Return Loss > 15dB
Frequency Range 50 – 3000MHz
Output Level Within -2.0dB of input signal

Optical Output

Number of Outputs 1
Connector Female SC/UPC, FC/UPC, SC/APC, FC/APC
Operating Wavelength
Standard 1310nm DFB
CWDM 1270-1610nm
DWDM C-Band (ITU G.694.1 compliant)
Output Power
Standard 1310nm +2dBm
CWDM +2dBm
DWDM +11dBm

RF System Performance

7708LT+7708LRA pair
Frequency Response
950 – 2150MHz ±1.5dB
120MHz – 3GHz ±2dB
±0.25dB on 36MHz BW to 2.3GHz

RF System Performance

7708LT+7708LR-H pair
Frequency Response
950 – 2150MHz ±1.5dB
120MHz – 2.3GHz ±2dB
±0.25dB on 36MHz BW

10MHz Performance

7708T13 – 10MHz + 7708R – 10MHz pair
Manual Gain Range -5 to +10dB
Input Power Range +10 to -40dBm
OIP3 +29dB
Harmonic Rejection +60dB


Voltage +12V DC
Power 6 watts max excluding LNB Power


Number of Slots 1


Laser Safety Class 1 laser product
Complies with 24 CFR 1040.10 and 1040.11, IEC 60825-1
EMI/RFI Complies with FCC Part 15, Class A EU EMC directive

Ordering Information

Notes For companion receiver see the 7708LRA/7708LR-H catalogue page
7708LT13 Wideband RF fiber transmitter, 1310nm DFB laser, SmartMON™, VistaLINK®
7708LTxx Wideband RF fiber transmitter, CWDM DFB laser, SmartMON™, VistaLINK®
7708LTDxxx Wideband RF fiber transmitter, DWDM DFB laser, BNC connectors, SmartMON™, VistaLINK®
7708T13-10MHz 10MHz RF fiber transmitter, 1310nm DFP laser
7708Txx-10MHz 10MHz RF fiber transmitter, CWDM DFP laser

Ordering Options

Note Rear plate and fiber connector must be specified at time of order - eg: [model]+SC+3RU
standard RF connectors are 75Ω BNC
Connector Suffix
+AP+SC SC/APC (Angle Polished)
+AP+FC FC/APC (Angle Polished)
+F75 75Ω F-Type
-B50 50Ω BNC connector
-S50 50Ω SMA connector
Rear Plate Suffix
+3RU 3RU rear plate for use with 7800FR or 7801FR Multiframes


7800FR 3RU Multiframe which holds 15 single slot modules
7801FR 1RU Multiframe which holds up to 4 single slot or 2 dual slot modules