How to Find a Coaxial Outlet: A Comprehensive Guide for Technicians and DIY Enthusiasts

When disconnecting or troubleshooting audio/video (AV) systems, it is essential to locate the correct coaxial outlet. This guide will walk you through the various methods to accurately identify a coaxial outlet, from using a signal tracer to performing manual tests with a multimeter.

Identifying the Type of Coaxial Outlet

Before you start the process, it is crucial to determine the type of coaxial outlet you need. Coaxial outlets come in different connectors such as UHF, SO239, F-type, BNC, SMA, and N-types. Knowing the specific connector type ensures you have the appropriate tools and equipment to perform the test effectively.

Using a Signal Tracer on eBay

For those who do not have access to specialized tools, an alternative method is to use a cheap signal tracer purchased from eBay. This tool sends a tone down the coaxial cable, allowing you to locate the cable with the corresponding receiver part of the tracer:

Cheap Signal Tracer Finder on eBay

Locating Coaxial Outlets with a 75 Ohm Termination Resistor

Troubleshooting AV systems often requires you to plug and unplug cables, which can be time-consuming. To speed up the process, you can use a 75 ohm terminating resistor plug to fit coaxial outlets. After connecting the resistor to the outlet, you can use a multimeter set to the resistance range to identify which cable has the correct resistance:

F-Type 75 Ohm Terminator - 10 Pack on Amazon

Once you identify a coaxial cable by its resistance, mark and label it. Repeat this process for all the outlets to ensure all cables are properly identified.

Troubleshooting Manually with a Multimeter

For those who prefer a more manual approach, you can use a multimeter to test for continuity and resistance. First, unplug everything from the coaxial outlets in all the rooms. Then, use a 75 ohm terminating resistor to test each outlet for a resistance value close to 75 ohms.

A more simplified method involves using a TV or other monitor at an outlet and disconnecting outlets one by one until the signal is lost. This works particularly effectively in a residential setting:

1. Connect a TV to an outlet and turn the volume up loud.

2. At the coaxial hub, disconnect one outlet at a time.

3. Observe when the signal is lost on the TV and mark the disconnected outlet accordingly.

An alternative is to short the end of the coaxial cable you wish to find, then test all the unlabelled connectors to see which one reads 0 ohms. This method requires some patience but ensures you identify the correct coaxial outlet.

Creating a Coaxial Cable Nub for Easier Testing

To further simplify the process, you can create a coaxial cable nub that shorts the center conductor to the shield. This nub can be made using a friction fit connector, which does not require threading it on and off repeatedly. This tool can be a handy addition to your toolkit for quick and easy troubleshooting:

Coaxial Cable Nub - 10 Pack on Amazon

By following these steps, you can efficiently locate and troubleshoot coaxial outlets in any AV system, whether you are a professional technician or a DIY enthusiast.