Question: What Does An SWR Reading Of 4 1 Indicate?

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..

Can SWR be too low?

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.

Does rain affect SWR?

When it rains, all the elements of the antenna becomes wet and thus changes the SWR. Almost all antennas have this down side to rain (and snow).

Does SWR change with power?

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

Is higher or lower antenna gain better?

To Gain or Not to Gain… That is the Antenna Question. When looking at mobile two-way radio coverage, many users jump to the conclusion that the higher the gain rating is on an antenna, the better the coverage. … Since an antenna does not make power, increasing gain in one direction will decrease propagation in another.

Where do I put the SWR meter?

The SWR indicator in the radio should go near flat after auto tune while the meter between the tuner and the antenna may move some but not go flat because that point in the system is not being matched. The meter at that point will prove it.

What is a good antenna return loss?

1.2. As you can see, higher return losses mean more power into the antenna. Although more return loss is better here, there is little benefit above 10 dB return loss, since more that 90% of available power is already being delivered to the antenna. Return losses above 10 dB have little practical benefit.

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.

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.

What does a very high SWR reading mean?

What does a very high SWR reading mean? The transmitter is putting out more power than normal, showing that it is about to go bad. The antenna is the wrong length, or there may be an open or shorted connection somewhere in the feed line. There is a large amount of solar radiation, which means very poor radio conditions.

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.

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 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.

Does antenna gain affect reception?

Higher gain antennas can increase your reception (it will be directional and match the transmission pattern of that specific antenna.). 2. You are still at the mercy of the weakest transmitting power (distance).

Why does my SWR go up when I talk?

One of the most common causes of high SWR readings is incorrectly connecting your SWR meter to your radio and antenna. When attached incorrectly, readings will be reported as being extremely high even if everything is installed perfectly.

What is a good SWR ratio?

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.

How do you reduce VSWR?

VSWR Reduction. One technique to reduce the reflected signal from the input or output of any device is to place an attenuator before or after the device. The attenuator reduces the reflected signal two times the value of the attenuation, while the transmitted signal receives the nominal attenuation value.

What is an acceptable VSWR?

A VSWR of less than 1.5:1 is ideal, a VSWR of 2:1 is considered to be marginally acceptable in low power applications where power loss is more critical, although a VSWR as high as 6:1 may still be usable with the right equipment.