Product Description
Professional 12G-SDI BNC Male-to-Female Extension Cable
Extend an existing 12G-SDI cable run without using a separate barrel adapter. This professional BNC extension cable combines one BNC male connector with one female BNC jack and is manufactured with genuine Belden 4855R Mini RG59 75-ohm coaxial cable.
Belden 4855R provides high-bandwidth 12G-SDI performance in a thin, lightweight cable that is easy to route around cameras, monitors, equipment racks, patch panels, fly packs and mobile production systems.
Every extension cable is hand assembled in the USA, individually inspected and tested for dependable professional video performance.
12G-SDI BNC Extension Cable Features
- BNC male-to-female extension configuration
- Extends an existing BNC cable without a separate barrel adapter
- Supports SD-SDI, HD-SDI, 3G-SDI, 6G-SDI and 12G-SDI
- Supports single-link 12G-SDI and applicable 4K UHD workflows
- Genuine Belden 4855R Mini RG59 coaxial cable
- Professional true 75-ohm BNC male and female connectors
- 23 AWG solid silver-plated copper center conductor
- Compact 4.04 mm nominal cable diameter
- Thin and lightweight compared with standard RG59 cable
- High-shield-coverage construction for professional video systems
- Flexible design for cameras, racks and production equipment
- Black cable jacket
- Available in lengths from 1 to 25 feet
- Hand assembled and individually tested in the USA
- Lifetime Connector Replacement Warranty
Extend Your 12G-SDI Cable Without a Barrel Adapter
A traditional SDI extension often requires a separate female-to-female BNC barrel coupler between two standard BNC male cables. This extension cable incorporates the female BNC connection directly into the assembly.
Instead of using:
BNC cable → barrel adapter → second BNC cable
You can use:
Existing BNC cable → AV-Cables extension cable → equipment
This reduces the number of separate components and provides a cleaner, more convenient extension connection.
Supported SDI Formats and Approximate Distances
| Video Format | SMPTE Standard | Approximate Maximum Total Run |
|---|---|---|
| SD-SDI | SMPTE 259M | Application dependent |
| HD-SDI | SMPTE 292M | Application dependent |
| 3G-SDI | SMPTE 424M | Up to approximately 300 ft |
| 6G-SDI | SMPTE ST 2081-1 | Up to approximately 215 ft |
| 12G-SDI | SMPTE ST 2082-1 | Up to approximately 150 ft |
Distances are approximate and apply to the complete signal path, including the original cable and extension. Actual performance depends on connectors, connected equipment, signal format and installation environment.
Choose the Right BNC Extension Cable
| Cable | Cable Size | Maximum Format | Best Use |
|---|---|---|---|
| Belden 4855R | Mini RG59, 4.04 mm | 12G-SDI | Single-link 12G-SDI and 4K UHD systems |
| Belden 1855A | Mini RG59, 4.04 mm | 6G-SDI | Thin, lightweight 6G equipment extensions |
| Belden 1505A | Standard RG59 | 6G-SDI | Larger-diameter 6G extension applications |
For a lightweight 6G-SDI option, view the Belden 1855A 6G-SDI BNC Extension Cable .
For a standard RG59 option, view the Belden 1505A 6G-SDI BNC Extension Cable .
Belden 4855R Cable Specifications
| Specification | Details |
|---|---|
| Cable | Belden 4855R Mini RG59 |
| Connector A | BNC male, true 75 ohm |
| Connector B | Female BNC jack, true 75 ohm |
| Impedance | 75 ohms |
| Center Conductor | 23 AWG solid silver-plated copper |
| Nominal Cable Diameter | 4.04 mm (0.159 in) |
| Jacket | Black PVC, CMR rated |
| Bandwidth | Up to 12 GHz |
| Supported Formats | SD-SDI, HD-SDI, 3G-SDI, 6G-SDI and 12G-SDI |
| Assembly | Hand assembled and individually tested in the USA |
| Warranty | Lifetime Connector Replacement Warranty |
Available Extension Lengths
Available lengths include 1, 2, 3, 6, 10, 15 and 25 feet. Contact AV-Cables if you need a custom length or specialized connector configuration.
Typical Applications
- 12G-SDI and 4K UHD cameras
- Production switchers and video routers
- 12G-SDI monitors and recorders
- Video converters and signal processors
- Patch panels and equipment racks
- Fly packs and mobile production systems
- Broadcast studios and control rooms
- Corporate and educational AV systems
- Houses of worship and live production
Why Choose AV-Cables?
- More than 20 years of professional cable-assembly experience
- Genuine Belden broadcast coaxial cable
- Precision true 75-ohm BNC connectors
- Professional crimp construction and strain relief
- Every assembly is individually inspected and tested
- Custom lengths and volume pricing available
- Hand assembled in the USA
- Lifetime Connector Replacement Warranty
Browse all available configurations in our SDI BNC Extension Cable category .
12G-SDI BNC Extension Cable FAQs
How does this extension cable connect?
Connect the female BNC jack to the male BNC connector on your existing cable. Connect the BNC male end of the extension to your compatible SDI equipment.
Do I need a separate BNC barrel adapter?
No. The extension cable has an integrated female BNC jack, eliminating the need for a separate female-to-female barrel adapter.
Does this cable support 12G-SDI?
Yes. Belden 4855R supports single-link 12G-SDI and applicable 4K UHD video systems while remaining compatible with 6G, 3G, HD and SD-SDI equipment.
How do I calculate the total cable length?
Add the length of the original cable and the extension cable. For example, a 25-foot extension connected to a 100-foot cable creates an approximately 125-foot total signal path.
Does the extension affect maximum transmission distance?
Yes. The extension becomes part of the complete signal path. Performance depends on the combined cable length, SDI format, connectors, connected equipment and installation environment.
Is the cable directional?
No. This is a passive 75-ohm cable assembly. The connector arrangement determines how it physically connects, but it does not convert or change the video signal.
Where is the cable assembled?
Every cable is hand assembled and individually tested in the USA.
