Useful guidelines on using a VSWR meter

Discussion in 'General Announcements' started by G3YWX, Jul 27, 2018.

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  1. G3YWX

    G3YWX Ham Member QRZ Page

    There are plenty of myths about VSWR, and as a result there is a lot of uncertainty about the topic. Even using VSWR meters can be difficult for some.

    When a wave travels along a feeder such as coax, it needs a perfect match for all the power to be absorbed. If the match is not perfect, some of the power cannot be accepted and it is reflected back along the line. The voltages and currents from the forward and reflected waves sum together and set up standing waves. These can damage a PA, cause the TX power to be reduced if protection circuitry is included in the transmitter. It can even cause damage to the feeder if high powers are being used.

    As part of our demystifying VSWR set of articles, we've put together an article on how to use a VSWR meter. This gives some useful insights into using VSWR meters, how to make the measurements, what results are good, etc. Then for those who want to delve deeper, there are many more pages on VSWR.

    Attached Files:

    KG7OOM, K4AGO and N0JZQ like this.

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