Do you have questions?
Check out our Help Center!
CB World Help Center

Cart Checkout Cart Checkout

COVID-19 Notice 

We want to assure our valuable customers that we are doing our part to limit the spread of this disease by following guidelines regarding handwashing, regularly cleaning and disinfecting our facility and equipment, and asking employees to stay home if they are feeling sick or having symptoms.  What will never change is our commitment to ALWAYS providing excellent customer service.  Our business is open and we are shipping orders.  Please understand that there may be possible delays in delivery/transit times due to carrier restrictions.  Customers are having concerns as to whether or not packages are safe to receive and handle- The WHO and CDC have stated that the likelihood of catching the COVID-19 virus by touching cardboard or other shipping container is low.  We hope this information helps!

From all of us here, we wish you the very best. 

How to Test Coax for Continuity

Knowing how to test coax cable is an important part of diagnosing CB radio and antenna issues. Problems with transmission, problems with receive, high SWR, and low power output are all problems that can be caused by a bad CB coax. Testing your coax cable is a fairly simple process.

There are three tests to perform on your CB Coax Cable. All can be done with a test light or a multimeter. If you are not familiar with using these tools, see our guide to using multimeters and test lights. In our example, we use a multimeter.

Test 1: Center Conductor Continuity

The first thing to check on your coax cable is that you have good continuity in the center conductor from one end of the cable to the other. To test this, touch one probe from your multimeter to the center conductor on one end of the cable, and the other probe to the center conductor at the opposite end of the cable. The meter should read no resistance. If the needle doesn't move, or only moves a little, you will need to replace your cable.

Coax Center Conductor Continuity Test

Coax Center Conductor Continuity Test

Test 2: Shield Continuity

The next thing to check on your coax is that you have good continuity in the shield from one end of the cable to the other. To test this, touch one probe from your multimeter to the shield on one end of the cable, and the other probe to the shield at the opposite end of the cable. The meter should read no resistance. If the needle doesn't move, or only moves a little, you will need to replace your cable.

Coax Shield Continuity Test

Coax Shield Continuity Test

Test 3: Shield to Center

The last thing to check is continuity between the shield and the center conductor. In this case, you do not want continuity between the shield and the center conductor. If you find that you have continuity here, you have a shorted cable, which is bad. Pick one end of your cable and touch one probe to the center conductor and the other probe to the shield. Make sure not to let the probes touch each other, and don't let the probe touching the center conductor contact the shield as well. When you do this, your meter should not react. If it does, you have a short in your coax cable.

How to test coax cable Shield To Center

 

If you are testing NGP (no ground plane) coax, you should show resistance since there is a capacitor in the coax.