The MFJ-1026 is an electronic device that selectively attenuates undesired signals and noise, while allowing the desired signal to pass unabated. To accomplish this, it uses two antenna inputs: one for the primary receive/transmit antenna, and the other for a secondary antenna that the amateur radio operator locates for maximum reception of the undesired noise. The MFJ-1026 compares the signals from the two antennas, and nulls signals that are stronger from the noise antenna than they are from the primary antenna. The resulting signal is then ready to connect to the antenna jack of a ham transceiver.
- Skill level:
Things you need
- Solid copper wire
- Coax jumper with PL-259 connector at each end
- Zip wire, red/black, 26 gauge
- Coaxial power plug, 2.1mm
- Phono jumper with RCA plug at each end
Connect a solid copper ground wire from the "GND" stud on the rear panel of the MFJ-1026 to the same ground point to which you connected the transceiver.
Disconnect the antenna feedline from the transceiver. Connect the coax jumper to the "RADIO" jack on the back of the MFJ-1026. Connect the other end of the coax to the main antenna terminal on the transceiver.
Connect the red lead to the centre conductor of the power connector. Connect the black lead to the barrel of the connector. Connect the other end of the red lead to the positive terminal of the station 12 volt power supply, and connect the black lead to the negative terminal. Plug the power connector into the "POWER" jack on the back of the MFJ-1026.
Plug one end of the phono jumper into the "T/R CONTROL" jack on the back of the MFJ-1026. Plug the other end of the phono jumper into the T/R relay jack on the transceiver.
Connect the main antenna to the "MAIN ANTENNA" jack on the back of the MFJ-1026. Connect the auxiliary antenna to the "AUXILIARY ANTENNA" jack.
Tips and warnings
- If the signal you wish to null is noise from electrical appliances in your home, you can use the built-in whip antenna instead of an auxiliary antenna.
- Do not allow your antennas or feedlines to cross any electrical power lines.
- Disconnect all antennas during electrical storms.
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