What Is Acceptable SWR?

Is a longer CB antenna better?

Yes, taller/longer is better for range of distance when it comes to an antenna and the optimal antenna length is 1/4 wavelength.

That translates to 102 inches (8.5 feet), too tall to be practical for most mobile applications..

Why is my SWR reading so high?

Short. The most common cause of a high SWR is an antenna shorted to ground. There are two places a short can occur in a CB antenna system, in the coax and in the antenna stud.

How do I fix high SWR?

Antenna Mounting Location The location you mount your antenna can cause a high SWR as well. If you mount the antenna low on the vehicle and close to the body, the signal will bounce back into the antenna rather than getting out. The only option in this case would be to raise the antenna up, or reposition the antenna.

Does coax length affect SWR?

Because it does not radiate and serves only to transfer RF between two components of the transmitter system, it’s performance in terms of efficiency is affected by length, but only in terms of overall resistance. … The drawback is that resistance and slight impedance mismatch of the coax affects the overall SWR reading.

Can high SWR damage a radio?

High SWR can reflect enough power back into the radio to create enough heat to cook the final RF transistor. It isn’t usually an immediate failure, it takes some time for that heat to build up and do damage.

How do I increase the range on my CB radio?

How to Increase the Receiving Range on a CB RadioInstall an antenna specifically manufactured for use with CB radios. … Place your antenna as high as possible, in a place where radio signals can hit it from 360 degrees. … Adjust the squelch on your radio so that it blocks out static, but is not maxed out.More items…

How can I improve my CB reception?

There are several procedures for ensuring maximum output.TUNE THE RADIO. A CB radio is only as good as the coax and antenna connected to it. … USE CB-SPECIFIC ANTENNAS. … ESTABLISH A GROUND PLANE. … CHECK THE VSWR. … ELIMINATE RESISTANCE.

What SWR is too high?

For instance a SWR too high (over 3:1) all over the band can be an indication of a bad part or junction, poor ground or poor location. An SWR too low over the whole band (1:1 for all 40 channels) can indicate a low efficiency antenna or lossy component. Safe operation of your CB should be with an SWR of 2:1 or less.

What does SWR stand for?

standing wave ratioFrom Wikipedia, the free encyclopedia. In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide.

What does an SWR reading of 4 1 indicate?

What does an SWR reading of 4:1 mean? An antenna loss of 4 dB. A good impedance match. An antenna gain of 4. An impedance mismatch.

Is 1.5 SWR good?

SWR 1.0-1.5: The ideal range! If your SWR is under 1.5, you’re in great shape. … Occasionally, due to installations or vehicle variables, it’s impossible to get SWR lower than than this. You should try to get it lower, but performance should still be acceptable in this range.

Can SWR be too low?

To answer the original question very simply, no, SWR can’t be too low. It can be too high. And, an swr of something around 1.5:1 isn’t a problem especially with the average 102″ whip (in fact, it’s pretty good).

Can I use 75 ohm coax for CB?

RG-59 and RG-6 are 75 Ohm coaxial cables designed for cable television applications, they tend to have wide frequency response and low line loss. … You can use these cables with a 50 Ohm amateur radio antenna system, but because of the impedance mismatch, your SWR will be a little higher.

How do I know if my CB antenna is bad?

Testing for a Defective CB AntennaUsing your multimeter, touch one of the probes to the metallic end of the antenna. For fiberglass antennas, this will usually be the tunable tip on the antenna’s end. … Touch the other probe to the metallic threads at the end of the antenna. … As you maintain contact with both probes, measure the circuit’s resistance.