Quick Answer: What Does A Very High SWR Reading Mean?

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 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.

How do you tell if your CB antenna is grounded properly?

An easy way to test your antenna’s ground is check continuity between the CB antenna mount and your vehicle ground, because if the antenna mount is well grounded, so is your antenna. To test for continuity of electrical signal, you will need to touch the probes for your multi-meter in two locations.

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.

What affects SWR?

There are many things other than the antenna that can cause high SWR. SWR meter readings take into consideration the antenna, the coaxial cable, the mount, the mounting location, the vehicle and objects in the antennas near-field environment.

How do I find SWR?

SWR can be calculated from the formula: As you can see by the final expression, SWR and VSWR and ISWR are equal. The smaller the ratio, the better the match between the load and the transmission line. Thus, a 1:1 ratio indicates there are no standing waves and the load is a perfect match.

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.

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).

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.

What does an SWR reading of 1 1 mean?

What does an SWR reading of 1:1 mean? The best impedance match has been attained. An antenna for another frequency band is probably connected. No power is going to the antenna.

How do you adjust the SWR on a CB radio?

Turn the radio to channel 1. Key the microphone (depress the button and hold it). Turn the knob on the SWR meter labeled “SET” or “ADJUST” until the needle reaches the setting position at the end of its range. While still keying the microphone, flip the switch on the SWR meter to the “REF” or “SWR” position.

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 is an acceptable SWR reading?

What is a good SWR reading ? The best reading possible is 1.01:1 (46dB return loss), but usually a reading below 1.5:1 is acceptable. Outside the perfect world a 1.2:1 (20.8dB return loss) is spot on in most cases. To ensure an accurate reading, it is best to connect the meter at the base of 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.

Does SWR affect reception?

Simplified answer: There is no relationship between SWR and receive performance. … SWR is a measure of the impedance mismatch between your antenna and transceiver. Whether transmitting or receiving, a higher SWR correlates with a less efficient coupling of energy between the transceiver and antenna.

How do you lower the SWR on a dipole antenna?

To raise the frequency of minimum SWR, trim the antenna shorter. Cut each of the dipole’s segments by equal amounts so that the two halves maintain equivalent lengths. If the minimum SWR is minimized at a higher frequency than desired, you must lengthen the wire segments.

Does SWR change with power?

SWR really doesn’t increase with power. It’s always the same.

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.

What does S RF mean on CB?

S-RF meter is a signal strenthg meter, on transmit it shows the strength of the outgoing signal, on recieve the strength of the incoming signal or the background noise if no incoming signal. You have to go to the 76 series Unidens to get an SWR meter.