MFJ HF Amp meters

Inserted directly into the antenna feedline, measures antenna current in three calibrated ranges.
Use the RF current meters for precise measurements of antenna currents, while tuning your amplifier or tuner, calculate the impedance of your antenna feedpoint. Highly suitable for experiments with antennas or monitor changes of the antenna during operation.

Tuning for maximum antenna current usually results in highest radiated power (power rises to the square of the current). The minimum SWR is not necessarily the point where the highest antenna current is found. Or compare the efficiency of various tuners, the MFJ HF current meters identify losses quite easily.
The MFJ HF current meters are solid constructed devices for shortwave. Frequency range 1 to 30MHz, calibrated ranges for max. 0,3, 1 or 3A. 3A correspnd to 450W on a 50Ω antenna.

MFJ-834, HF current meter, Coax, max. 3A

Connectors PL sockets for direct insertion into the feedline. Large, backlit analog instrument, size 152 x 89 x 114mm, weight 425g.

Order No.
MFJ-834 105.80


MFJ-835, HF Ampèremeter, Parallel wire, max. 3A

Ideal to check the current balance of parallel wire feeds. The large bar in the middle of the instrument clearly identifies the range of balanced current on both wires. Balanced currents lead to less radiation from the feedline, reduces distortion of the antenna pattern, less risk of TVI and BCI. The MFJ-835 allows you to analyse the problems exactly.

Binding posts for parallel wire. Large, backlit analog cross-needle instrument, size 152 x 89 x 114mm, weight 620g.

Order No.
MFJ-835 166.80


MFJ-854,HF Current meter

The MFJ-854 is a very sensitive HF current meter. The sense coil snaps over any wire, radiator or cable and measures the true current flow in that conductor. This allows to measure currents in parts of an antenna, in radial or ground networks or on coaxcales. Also detects induced current in other conductors, like any household appliance and helps in identifying interferences like TVI or BCI.
Five fixed ranges from 30mA to 3A or one variable range selectable. The variable range has a minimum sensitivity of 1mA, enough to sense smallest currents like those from the MFJ SWR meters MFJ-259C or MFJ-269.

Delivery does not include a power supply!

Order No.
MFJ-854 152.40


MFJ-826B Digital SWR/Watt Meter

Measures power and SWR on HF and 6m.

Forward and reflected power, SWR and tx frequency can be displayed at the same time. Alternatively TX power and SWR can be displayed as easy to read bar graphs. The MFJ-826B has as backlit 2 line LC display. Softwareupdate are possible over the RS232 serial interface.

Power ranges: 25/250/1500 Watt
Frequency range: 1.8 - 54 MHz
Operating Voltage: 12-15 V
Power requirements: 250 mA
Size: 165x70x170 mm
Connectors: 2x PL female


Order No.
MFJ-826B 229.00


MFJ-813: QRP Wattmeter

SWR/Wattmeter for QRP

The MFJ-813 offers a calibrated scale up to max. 5 Watt and allows measurements of power and SWR, the minimum power is 100mW. The sensor (system Bruene) detects RF voltage and current for a uniform accuracy over a wide range of impedances, frequencies and power. Frequency range 1.8 to 50MHz, aluminium case, 2x SO-239 (PL) connectors, size 11.5 x 6 x 7.5 cm.

Order No.
MFJ-813 55.00

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