MFJ MFJ-260CN User Manual

MFJ-260 DUMMY LOAD

The MFJ-260 Dummy load is a dry, air coooled, resistive dummy load. This resistor load
is capable of dissipating RF power without the bulk or mess of oil or other coolants. It is
capable of handling up to 300 Watts for a short period of time. For added convenience a
derating curve is shown below and on the end plate of the dummy load.

Operation

1. Become familiar with the duty cycle derating curve so that over-heating of the resistor
is avoided.

2. Connect the transmitter or amplifier to the input of the dummy load with a PL-259
connector.

NOTE:

Do not let the dummy load resistor get hot enough to glow red. If the dummy
load resistor starts to glow red, turn off the transmitter immediately and allow the dummy
load to cool down before touching it.

Specifications

IMPEDANCE: 50 Ohms, ± 10 %

VSWR: Max: 1.3:1, 0-650 MHz

POWER 300 Watts for 30 seconds
DISSIPATION: 90 Watts continuous

DIMENSIONS:

1

227

1

1

××

2

2

′′

POWER CURVE

Derating curve for the MFJ260 Dummy Load.

2