MFJ MFJ-5124K Instruction Manual download pdf (Page 9)

MFJ-993B IntelliTuner Automatic Antenna Tuner Instruction Manual

Fast Start

WARNING

● Never operate the tuner with its cover removed. Contact with the components inside the

tuner while transmitting will result in painful RF burns.

● Locate the tuner so that the rear terminals are not accessible during operation. The single

wire and balanced line connection may have high voltage while transmitting.

● Disconnect all antennas from the tuner during lightning storms.

● Always tune with low power (about 10 watts). Apply maximum power only after tuning up.

● Never exceed tuner specifications.

● Do not transmit with a high SWR for extended periods of time.

1. Connect the MFJ-993B to a 12-15 VDC voltage source capable of supplying at least 1 amp.

2. Connect your transmitter to the TRANSMITTER connector using a 50-ohm coaxial cable.

3. Connect your coax-fed antenna to the ANTENNA 1 connector using a 50-ohm coaxial cable, or

connect your random wire to the WIRE binding post, or connect your balanced line antenna to the

BALANCED LINE binding posts and connect a jumper between the other two posts as indicated.

4. Connect your ground connection to the GROUND post.

5. Press the [POWER] button to turn on the MFJ-993B tuner. Place the [ANT] button in the out

position to select antenna 1. Press the [AUTO] button in to select semi-automatic mode.

6. Key your transmitter to output a carrier of 10 watts CW, FM or AM.

7. Press and hold the [TUNE] button on the MFJ-993B for one second to start the automatic tuning

process. When completed, check to ensure an SWR of 2.0 or less before increasing RF power.

8. You are ready to transmit.

Note: During the automatic tuning process, the tuner will make some noise. These are the relays

switching at a very fast pace and it is normal operation. Do not be alarmed.

Note: When the tuner power is OFF, the tuner is in bypass mode and RF from the transmitter goes

directly to the antenna (ANTENNA 1) with no matching. When the tuner power is ON,

pressing [C-DN] and [L-DN] simultaneously or pressing [TUNE] quickly places the tuner in

bypass mode (zero inductance and zero capacitance) and indicates by the reflected needle

bouncing to 20 watts.

Transmitter MFJ-993B

50-ohm Coax

Antenna 1

RF Ground 12 VD

ntenna 2

Figure 1. Installation Block Diagram.

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MFJ MFJ-5124K Instruction Manual Page 9