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Why do We Need Standing Wave Ratio (SWR)?

Date:2021/3/15 11:58:16 Hits:


What is Standing Wave Ratio?Why do we need standing wave ratio? The following content will introduce you the most detail about the reason to why we nedd SWR.


Why do We Need Standing Wave Ratio (SWR)? 

The term “SWR” means standing wave ratio. A “SWR” meter is used to measure how well the transmit power signal emitted from a transceiver (radio) is traveling through the antenna system into the atmosphere.


If you are serious about the CB radio hobby than it’s probably one of the biggest keys in measuring the efficiency of your CB radio system.


Checking and setting the antenna is critical to overall performance of transceiver (radio). During installation of a Business Band, CB, Ham or Marine radio or installing a new antenna, the SWR must be checked to ensure the transmit power coming from the radio is traveling through the antenna system correctly.

A poor performing antenna system significantly reduces (transmit & receive) range and can damage the transceiver (radio). When the signal does not travel through the antenna system correctly, the transmit power is reflected back into the transceiver which causes reduced range and potential damage to the internal parts.


To measure SWR you need an SWR meter which are readily available at about any CB shop, Radio Shack, or online.



SWR Meter for Tuning a Antenna: AW-07


Checking and setting the “SWR” on all radio applications is the most important step in obtaining the best performance possible.


When testing and adjusting the antenna, make sure to check “SWR” on the lowest channel and the highest channel. A SWR of 2.0 or below is good enough in most cases for you to operate your radio safely. 

Anything above that and the reflected power coming back to your radio can cause damage over time.


If you are running an amplifier with your setup an SWR of 1.3 or lower is recommended.


By adjusting and setting the “SWR” on the entire bandwidth (high and low channels), it will ensure optimum performance on all of your radio channels. The radio will receive and transmit well with a good “SWR” reading of 2.5 or less across all channels. The lower the “SWR” reading the better your radio will perform.


Check SWR on AM only, not on SSB. Your other readings will be ok if you have good SWR readings on AM. 



Also read:

What is VSWR and how to measure VSWR?

How to Eliminate Noise on AM and FM Receiver

Simple and Budget DIY - How to Make An FM Transmitter?

What is the Difference between AM and FM?


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