Yes—RG6 can be an excellent cable for SDI video.

But there is an important qualification.

You cannot assume that every cable labeled RG6 will provide the same SDI performance.

Professional SDI systems require a controlled 75-ohm coaxial signal path, and the cable construction must provide sufficient performance for the SDI data rate and transmission distance being used.

For longer professional video runs, the lower attenuation available from certain RG6 constructions can make RG6 particularly useful.

Here's what you should know before choosing RG6 for HD-SDI, 3G-SDI, 6G-SDI or 12G-SDI.

WHAT IS RG6 COAXIAL CABLE?

RG6 refers to a general coaxial cable size and construction family widely used for RF and video applications.

Compared with many RG59 and Mini RG59 constructions, RG6 typically has a larger outside diameter and can provide lower signal attenuation.

That lower attenuation is one reason RG6 is attractive for longer professional video runs.

However, the term RG6 by itself does not guarantee SDI performance.

Two cables may both be described as RG6 while having very different electrical characteristics, shielding, materials and high-frequency performance.

CAN STANDARD RG6 CARRY SDI?

Some RG6 cable constructions can carry SDI extremely well. Others may not be appropriate for the required data rate or distance.

The important question therefore isn't simply:

"Is this RG6?"

A better question is:

"Is this specific 75-ohm RG6 cable construction appropriate for my SDI format and required distance?"

Professional cable manufacturers publish transmission characteristics that allow the cable to be evaluated for particular video applications.

WHY RG6 WORKS WELL FOR LONGER SDI RUNS

All coaxial cable introduces signal loss.

As cable length increases, that loss increases. Higher-frequency signals also generally experience greater attenuation.

This becomes increasingly important as SDI data rates increase.

A professional RG6 construction can provide lower attenuation than a smaller coaxial cable, allowing it to become an attractive option as transmission distance increases.

That's why a production system may use compact Mini RG59 inside a rack but transition to RG6 for longer facility or production runs.

RG6 FOR 3G-SDI AND HD-SDI

Professional 75-ohm RG6 has long been used in broadcast video environments.

For HD-SDI and 3G-SDI, a broadcast-grade RG6 construction can provide excellent transmission performance and is particularly useful where longer cable runs are required.

A well-known example is Belden 1694A, which is widely used in professional broadcast and video applications.

AV-Cables uses 1694A for professional 75-ohm BNC assemblies intended for appropriate HD, 3G and 6G applications.

CAN RG6 CARRY 6G-SDI?

Yes, appropriate professional RG6 constructions can support 6G-SDI.

As the data rate increases, however, the quality and characteristics of the complete transmission path become increasingly important.

That includes:

• The coaxial cable
• BNC connectors
• Connector termination
• Total cable length
• Patch panels and intermediate connections
• Equipment input and output characteristics

For 6G-SDI systems, selecting a cable assembly specifically intended for professional high-bandwidth video is preferable to choosing generic RG6 solely because it has the correct impedance.

CAN RG6 CARRY 12G-SDI?

Yes—but use an RG6 construction designed for the demands of 12G-SDI.

12G-SDI carries UHD video over a single coaxial connection and places significantly greater demands on the transmission path than lower-rate SDI formats.

For these applications, AV-Cables offers professional 12G-SDI RG6 assemblies using Belden 4694R.

Using a larger, lower-loss 12G-capable coax can be particularly valuable when the required run extends beyond the distances where smaller Mini RG59 constructions are the most practical choice.

RG59 VS RG6 FOR SDI

One of the most common mistakes is assuming that RG6 is always better because it is larger.

It isn't that simple.

RG6 generally becomes more attractive as transmission distance increases, while smaller cable constructions can provide important installation advantages on shorter runs.

WHEN SHOULD YOU CHOOSE RG6?

Professional RG6 is particularly worth considering when:

• The SDI cable run is relatively long
• Lower attenuation is important
• There is adequate space for the larger cable
• The cable will be used for a facility run
• The installation doesn't require extremely tight cable bundles
• Higher-bandwidth video must travel a substantial distance

WHEN IS MINI RG59 A BETTER CHOICE?

There are many situations where using a larger RG6 cable provides little practical benefit.

Consider a three-foot 12G-SDI connection between two devices in the same rack.

A professional 12G-capable Mini RG59 assembly can provide the required performance while being considerably easier to route.

Mini RG59 is particularly attractive for:

• Short patch cables
• Video routers
• Multiviewers
• Fly packs
• Dense equipment racks
• Short monitor connections
• Multi-channel cable snakes

The goal is not to use the largest cable possible. The goal is to use the right cable for the signal, distance and installation.

WHAT ABOUT RG59?

Standard-size professional RG59 occupies useful middle ground.

It can provide more transmission capability than smaller Mini RG59 constructions while remaining more compact than RG6.

For example, AV-Cables uses Belden 4505R for professional 12G-SDI RG59 assemblies.

This gives system designers multiple cable-size options instead of forcing every 12G-SDI application into the same coaxial construction.

THREE CABLE SIZES — THREE DIFFERENT STRENGTHS

DON'T FORGET THE BNC CONNECTOR

The coax itself is only part of the SDI transmission path.

Professional video systems require true 75-ohm BNC connectors designed for the coaxial cable being used.

The connector must be properly matched and terminated to preserve the electrical characteristics of the assembly.

This becomes increasingly important at higher SDI data rates.

HOW TO CHOOSE THE RIGHT SDI COAX

THE BOTTOM LINE

Yes, RG6 can carry SDI video—and professional RG6 can be an excellent choice for longer SDI runs.

But don't choose a cable simply because the jacket says RG6.

Use a professional 75-ohm coaxial construction appropriate for the SDI data rate and transmission distance.

For shorter, high-density installations, Mini RG59 may be the better physical choice. RG59 provides a useful middle ground. For longer runs where lower attenuation becomes increasingly important, RG6 can provide an important advantage.

Choose the coax for the signal + distance + installation.

PROFESSIONAL RG6 SDI CABLES FROM AV-CABLES

AV-Cables manufactures professional 75-ohm SDI cable assemblies for broadcast, live production, studios, mobile trucks, fly packs and professional AV installations.

Available constructions include Mini RG59, RG59 and RG6 for applications ranging from compact rack interconnects to longer professional SDI runs.

AV-Cables assemblies are hand assembled in the USA and individually tested before shipment.

AV-Cables — Professional • Reliable • Connected