What is swr antenna

If the feedline has no loss and has the same impedance as the transmitter output and the antenna input impedance, then maximum power will be delivered to the antenna. In this case, the VSWR will be and the voltage and current will be constant over the whole length of the feedline. The proportion of power to the antenna that is reflected back down the feedline is known as reflected power.

Look here for a very detailed discussion about SWR. Any instrument that is placed between the transmitter and the antenna changes the characteristics of the transmission line. Simply put, the better tuned your antenna is, the better range you will get. How can I check my SWR? Connect the SWR meter between the antenna and the radio, as per the diagram above. Now you need to make sure the radio is connected to power and turned on. Then you need to transmit on the radio using the microphone.

Whilst transmitting you will see the needle move on the meter. Now transmit again, using the microphone, whilst checking the meter reading. This will be the SWR reading of your antenna on that channel. What does the reading mean? Check the table below to find how well your antenna is tuned in. Which is the best channel to check the SWR on? What if my SWR is too high? Tuning Instructions Most mobile antennas have a grub screw, which you can unscrew slightly to alter the length of the antenna whip.

With poor load match, standing waves appear in the cable, which worsen the work of Wi-Fi equipment as a result of: - reduces the efficiency of the feeder, and, therefore, the overall efficiency of the transmitter; the real sensitivity of the receiver decreases; - reduces maximum power that can be brought to the antenna-feeder device; - matching of the transmitter and receiver with the antenna-feeder device is difficult.

Recent posts. How to shutdown a computer programmatically in Windows September 08, How to read connection string from App. October 29, This ensures that the impedances of the feedline and the antenna match perfectly, so that all available power is being radiated. To tune your antenna, you will need to use a SWR meter. This device is attached between your antenna and radio. This device measures the amount of signal being reflected into your transmitter to help you measure the quality of your outgoing broad cast as well as any potential threat to your radio.

Antenna tuning is the single most important thing you can do to ensure peak CB performance. If you would like step-by-step instructions on how to tune your antenna, please refer to our CB Antenna Tuning Guide.