MFJ-834H – HI PWR In-Line RF Ammeter 1-30 MHz


Introducing the MFJ-834H HI PWR In-Line RF Ammeter 1-30 MHz, the ultimate tool for optimizing your antenna system performance. Building on the success of its predecessor, the MFJ-834, this advanced ammeter offers additional high current ranges of 3, 10, and 30 Amps.


Designed to provide accurate measurements, the MFJ-834H allows you to easily measure antenna feedline current in three calibrated ranges. By simply connecting the ammeter between your antenna and tuner/transmitter/amplifier, you can fine-tune your equipment for maximum radiated power.

Whether you’re troubleshooting, checking for changes, or comparing antennas and tuners, the MFJ-834H is your go-to companion. It helps you determine the best antenna tuner settings and calculate your antenna feed point impedance by dividing your applied power by the square of the feed point current.

Unlike relying solely on minimum SWR readings, using the MFJ-834H ensures that you’re maximizing your power transfer and achieving a stronger radiated signal. This is because any adjustment that increases feedline current improves power transfer, resulting in a rapid increase in radiated power.

Measuring accurately over the frequency range of 1 – 30 MHz, the MFJ-834H delivers reliable readings in three linear ranges (3, 10, and 30 Amps). With SO-239 connectors, it ensures a secure and stable connection. The meter itself features a large 3-inch display that is easily readable, even in low-light conditions.

Compact and rugged, the MFJ-834H is built to withstand the demands of daily use. Measuring just 6″ (W) x 3″ (H) x 4″ (D), it can easily fit into your setup without taking up unnecessary space. It can be powered using either 12V DC or 110V AC with the MFJ-1312D power supply.

Experience the power of optimization with the MFJ-834H HI PWR In-Line RF Ammeter 1 – 30 MHz. Enhance your antenna system’s performance, maximize your radiated power, and take full control of your ham radio operations. Order yours now and revolutionize your setup today!

Additional information

Weight 0.8 kg