Manual mfj 259

Estimating transmission line loss Adjusting Tuners Adjusting Amplifier Matching Networks Testing RF Transformers Testing Baluns Measuring Inductance and Capacitance Measure capacitance. Measure inductance.

Resonant Frequency of tuned circuits Testing RF Chokes Technical Assistance MFJ Parts List Previous Page. Next Page. Failure to follow the operating instructions may cause false readings or even damage this unit. The MFJ has a standard 2. A pictorial polarity marking appears on the case near the power jack. The load must be 50 ohms of pure resistance for a meter reading of The common misconception that 25 ohms of reactance and 25 ohms of resistance in a load will give a SWR is absolutely untrue.

The SWR can be measured on any frequency from 1. No other devices are required. Page 6: Resistance Meter If a short jumper is placed from the center of the SO connector to the center of the BNC connector, the output of the MFJ oscillator will be displayed on the counter readout.

The frequency displayed will be the same on both Channel A and Channel B, while the jumper is in place. A coupling loop is useful for directing RF at a reduced level into the counter. A coil of wire, or even a straight piece of wire attached to the BNC connector may be sufficient for operation.

Page 8: Adjusting Simple Antennas Tuning basic antennas fed with 50 ohm coaxial cable can be accomplished with the following steps: 1. Connect the feedline to the MFJ Read the frequency display. Divide the measured frequency by the desired frequency. The method is as follows: 1. Connect one end of the cable to the MFJ input. For critical stubs you may want to gradually trim the stub to frequency. Measure inductance in uH and capacitance pF at actual operating frequencies.

Large easy-to-read two line LCD screen and side-by-side meters clearly display your information. Trim dipoles, verticals for lowest SWR at your favorite frequency. Adjust your Yagi, quad, loop and other antennas, change antenna spacing and height. Watch SWR, resistance and reactance change instantly. Adjust your antenna tuner or a perfect without creating QRM. Take the guesswork out of building andadjusting matching networks and baluns and antennas. Accurately measure distance-to- short or open in failed coax.

Measure coax length in feet, loss in dB, velocity factor and impedance.