Does high SWR affect receive?
Simplified answer: There is no relationship between SWR and receive performance. There is one condition for this simplification to be true: the received RF noise floor must be above your receiver’s noise floor.
What is a bad SWR?
You might have a bad SWR meter, something wrong with your antenna or antenna connection, or possible have a damaged or defective radio. If the SWR reading on channel 1 is higher than the reading on channel 40, your antenna system is too short and you need to lengthen your antenna.
What causes an antenna to fail with a high SWR?
A common misconception is that a high SWR due to a large impedance mismatch causes the power which is reflected back to its source to be absorbed by the transmitter output stage, overheating the output device (RF transistor finals, for example) and eventually burning them up. This is not the mechanism for failure during high SWR operation.
How does VSWR affect the transmission of power?
VSWR not only affects the efficient transmission of power but can have a severe effect on the transmitted audio. As a result of a mismatch, there is a portion of the RF signal that is reflected back towards the transmitter. When this reflected signal reaches the transmitter, it is reflected back towards the load.
Can a VSWR cause a range of impedances?
Take the load at the end of the transmission line, transform it according to the electrical length of the feedline, and put that equivalent impedance right at the transmitter’s terminals and you will have the same damage. A particular VSWR can result in a range of impedances.
Can a high impedance antenna be connected to a low impedance transmitter?
Would it be okay to connect a high-impedance antenna feedpoint directly to a transmitter without problems, whereas a low-impedance antenna might still cause an overcurrent condition? The VSWR isn’t the problem per se, it’s just the impedance that appears at the transmitter’s terminals.