MFJ -998 Instruction Manual download pdf (Page 6)

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna

4. Tighten the screws on the rear of the base plate against the surface of the support. The

screws should be tightened in equal increments to keep the force on the spacer plate

proportioned.

5. Loosen the Counterpoise Attachment.

6. Insert the end of the counterpoise wire

7. Tighten to secure the counterpoise.

8. Connect your transceiver’s output to the SO-239 (UHF female) connector labeled

TRANSMITTER on the back of the tuner.

9. Decide which mount placement will be used on the mounting bracket according to your

situation. There are five placements available. (See Choosing a Mounting Position

Section)

10. Connect the MFJ-63 Loading Coil Assembly and the MFJ-1956 12 ft. telescopic whip

antenna to the 3/8x24 stud on the top of the mounting bracket and extend to its full

length.

Using the MFJ-1625

CAUTION: Never Change The Antenna or Inductor Selector Switch Position While

Transmitting! Never Apply More Than 200 Watts To The MFJ-1625.

Preset the controls on the MFJ-1625 as follows:

• ANTENNA to maximum inductance - Position "A"

• MATCHING to minimum capacitance – Position “10”

• NORM/+C switch to NORM

• COUNTERPOISE to minimum inductance – Position “L”

• Hi-Z/Lo-Z switch (back of unit) to Lo-Z

• SENSITIVITY control fully clockwise (maximum sensitivity)

• LOADING COIL tap on turn 0

Most modern solid-state transceivers do not require tuning and loading adjustments. If the

transceiver has a built in antenna tuner, be sure it is turned off or disabled. If your transmitter

has an adjustable output circuit, it must be properly tuned to a 50-ohm load at the operating

frequency before adjusting the tuner. This should be done with a dummy load.

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MFJ -998 Instruction Manual Page 6