CCTV and Security Camera Coax: RG59 vs RG6 vs IP Hybrid Systems

Published on 10/13/2026

An existing camera installation has usable coax in the walls, but the recorder is being upgraded. Replacing everything with IP cameras may be attractive; preserving the coax may also be practical. The decision starts with signal format, cable condition and power, not a generic preference for RG59 or RG6.

Use 75 ohm coax appropriate to the camera and recorder format for coax-based CCTV. RG59 and RG6 are families, not universal distance guarantees. An IP camera does not connect to ordinary coax directly; Ethernet-over-coax requires compatible conversion hardware and a qualified link.

This guide separates baseband analog video, proprietary HD-over-coax formats and packet-network upgrades. A cable that carries one format reliably may not meet another format's limits.

Match the signal system first

Traditional analog video and newer HD-over-coax systems can share a BNC-style connection while having different bandwidth and equalization requirements. Confirm camera format and recorder support, resolution/frame-rate mode and approved cable conditions.

RG59 can suit shorter video routes and compact installation. RG6 often provides a larger conductor and different loss profile, but actual construction determines performance. Use the manufacturer's cable data and camera-system distance guidance.

RG59 vs RG6 is a product-specific comparison

Inspect conductor material, dielectric, shield and jacket. Copper-clad steel construction can differ from solid copper in DC resistance and suitability for power-related paths. A label saying RG6 does not settle whether a particular cable is right for the camera system.

Compare loss at the frequencies relevant to the video format and use the actual route length. A thicker cable is not automatically compliant with the building's fire or environmental requirements. Verify the installed cable rating and the local installation requirements.

Do not reuse a BNC termination solely because the outside diameter looks close. Match connector impedance, cable dimensions and preparation instructions. A poor termination can create reflections that an otherwise suitable cable would not.

Power and grounding need their own design

A Siamese cable can contain coax for video and a separate pair for power. Calculate voltage drop on the power pair, not from the coax attenuation table. The camera must receive adequate voltage at its highest specified current and worst-case operating conditions.

Some coax systems support power through the coax with compatible equipment. Do not apply power to an ordinary video path unless both ends and all intervening hardware support that method. Ethernet-over-coax equipment can also have model-specific PoE or local-power requirements.

Ground-potential differences can create video problems. The coax shield is part of the signal return path, so do not disconnect it as a generic cure. Use system-approved isolation and grounding methods, and keep electrical safety separate from RF troubleshooting.

Evaluate an IP hybrid upgrade from verified hardware

Ethernet-over-coax converters can preserve existing cable when the endpoints, rate, length and power conditions are supported. They are not passive BNC-to-RJ45 adapters. Verify the converter pair and camera power budget, and test the actual cable rather than assuming every old coax run is serviceable.

Check joints, splitters and hidden branches. Equipment that carries analog video may not be suitable for the conversion link. Record whether the route is point-to-point and whether every component is approved for the selected transport.

Read SigmaRF's RG6 vs RG58 guide for impedance distinctions and its connector-termination guide for preparation controls. This article focuses on camera-system migration, not RF antenna feeder selection.

Worked engineering example

A hypothetical 12 V camera draws 0.50 A through a separate two-wire power route with 4 ohm total loop resistance. This example is not a recommendation that the resulting voltage is acceptable.

A video picture can fail because of insufficient camera power even when coax continuity is good. Diagnose video transport and power separately. For PoE or power-over-coax, use the selected equipment's complete budget instead.

Mistakes to avoid

Frequently Asked Questions

Bottom Line

Choose the transport architecture first, then qualify the cable and power paths. Existing coax can be valuable, but reuse must be supported by the selected camera and conversion hardware.

For a cable RFQ, state 75 ohm video requirements, both interfaces, length, conductor construction and installation conditions. For an IP upgrade, include the actual converter pair and power budget in the system plan.

SigmaRF VNA-sweeps every assembly for VSWR and insertion loss before shipment. Its testing capability spans 100 MHz to 40 GHz; each assembly is specified for its own operating band. Builds are supported by the Vadodara volume facility and Cleveland-area precision facility. Lead times can be as short as 2 days, depending on the build and component availability.