HF/VHF/UHF Optical Link | GL7840
Global Foxcom’s GL7840 HF/VHF/UHF Optical Link is a Sat-Light Gold Series RF over Fiber link for transporting radio and TV signals across the 3–1000 MHz range. Built for off-air reception and remote transmit antenna placement, the GL7840 supports wideband RF transport with selectable AGC/MGC control, front panel test access, and high dynamic range laser performance.
Features & Benefits
- Wideband 3–1000 MHz RF coverage
- Optimized for HF/VHF/UHF radio and TV transmission
- 10 km transmission distance
- Selectable variable AGC/MGC operation
- Front panel test port for signal checking
- Supports low-power off-air reception and remote transmit antenna placement
- Handles digital and analog radio/TV modulation schemes
- Adjustable link gain from -30 dB to +30 dB
- Supports 50-ohm and 75-ohm RF environments
- Compatible with first-generation Sat-Light 7000 Series platform
The GL7840 is suited to organizations that need to move HF, VHF, and UHF radio or TV signals between separated antenna, modulator, receiver, or equipment room locations without compromising RF performance. It supports both receive-side and transmit-side use cases, making it practical for broadcast facilities, satellite communication networks, RF over Fiber infrastructure, monitoring sites, and communication systems that require stable wideband signal transport.
From a system planning perspective, the GL7840 provides engineering teams flexibility across gain control, connector selection, impedance requirements, and installation format. Selectable AGC/MGC operation supports different RF level management needs, while the front panel test port assists with commissioning and maintenance. With 3RU slot module and standalone options, the link fits both existing Sat-Light platform environments and new RF transport deployments.
Basic Details
| RF Specification | Value |
| Frequency Range – Bandwidth | 3-1000 MHz |
| Amplitude Response @ Unity Gain | ±2 |
| Noise Figure | 21 |
| Output IP3 (OIP3) | +20 |
| Input Signal Range – Total Power | -45 to -5 |
| RF Output Signal Range – Total Power | -45 to -5 |
| Optical Specifications | |
| Optical Budget / Distance 1310nm 1550nm | 1310 nm | 1550 nm 8 |15 |
What makes the GL7840 suitable for mixed RF environments?
The GL7840 covers HF, VHF, and UHF frequencies across 3–1000 MHz, making it suitable for sites that handle different radio or TV signal types through one wideband optical link.
How does AGC/MGC selection support different installations?
AGC is useful where incoming RF levels vary and automatic control is preferred. MGC is useful where the system needs a fixed gain setting during commissioning or controlled operation.
What does the front panel test port provide during maintenance?
The front panel BNC sample port provides a -20 dB signal sample point, giving technicians a practical way to check signal presence and level without disturbing the main RF path.
How does the GL7840 fit into existing Sat-Light infrastructure?
The GL7840 is compatible with the first-generation Sat-Light 7000 Series platform and is available as a standard 3RU slot module for the 7180 chassis or as a standalone version with a wall-mounted power supply.
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