MFJ VersaTuner III Instruction Manual
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MFJ VersaTuner III Instruction Manual

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Summary of Contents for MFJ VersaTuner III

  • Page 2 Long wire antennas can be connected to the WIRE terminal in the BAL.LINE setting. The antenna switching board uses nine 16A 1KV relays to switch the antennas. Note the tuner requires 12V to operate which can come from the station power supply or one of the MFJ power adapters. Understanding Power Ratings There are no standardized power rating systems for tuners.

  • Page 3: Peak Reading Swr/Wattmeter

    MFJ-962E Instruction Manual reactance loads. T-network tuners always handle the least power when operated on 160 meters into low impedance capacitive reactive loads. Front Layout Figure 1 Peak Reading SWR/Wattmeter The cross-needle meter measures the peak or average FORWARD power, REFLECTED power, and SWR.

  • Page 4: Installation

    OFF switch turns the meter lamp on and off. The antenna relay switching network and the peak power circuit requires power from an external 12 VDC source, such as the optional MFJ-1312B power supply. The rear panel jack accepts a 2.1 mm coaxial plug with the center conductor positive (+) and the sleeve negative (-).
  • Page 5 Using The MFJ-962E WARNING: Never change the Antenna Selector position while transmitting! Never apply more than 800 Watts to the MFJ-962E ! In any conventional "T" network tuner, maximum power handling and the smoothest tuning occurs when the capacitance in the network is as large as possible.

  • Page 6: Operation

    Note: Always use the most capacitance (settings closest to 0) for the most power handling and the least loss. Use the smallest possible inductance (the highest number possible) also. Note: The MFJ Air Core™ Roller Inductor is designed with an exclusive Self-Resonance Killer™ that keeps potentially damaging self-resonances away from your operating frequency.

  • Page 7: Operating Notes

    MFJ-962E Instruction Manual Then place the POWER switch in the LO and AVG meter positions. 4. Starting from the minimum INDUCTOR position (highest number), turn the INDUCTOR control counter-clockwise (adding more inductance) while applying a slight amount of power (less than 25 watts). Tune for the lowest reflected power and maximum forward power (lowest SWR).
  • Page 8 MFJ-962E Instruction Manual WARNING: 1. Never operate the tuner with the top removed. Contact with the components inside the tuner while transmitting will result in painful RF burns. 2. Never rotate the ANTENNA SELECTOR switch while transmitting. Doing so may permanently damage the relays.

  • Page 9: Antenna System Hints

    For operator safety, a good outside earth ground or water pipe ground should always be installed and connected to the case of the MFJ-962E. Make certain the safety ground also connects to the transmitter and other station accessories. A wing nut post marked GROUND is provided for ground connection(s).
  • Page 10 MFJ-962E Instruction Manual One example where this problem occurs is on 80 meters when an odd quarter-wave (60 to 70 foot) open wire line is used to feed a half-wave (100 to 140 foot) dipole. The odd quarter-wave line transforms the dipole's low impedance to over three thousand ohms at the tuner. This is because the mismatched feedline is an odd multiple of 1/4 wavelength long.
  • Page 11 MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.
  • Page 12 MFJ-962E Instruction Manual...
  • Page 13 MFJ-962E Instruction Manual Logged Tuning Chart Use the chart below to log values for your station. You may want to copy this chart and post it by your tuner. Frequency (MHz) Transmitter Inductor (counter indicator) Antenna 3.75 3.75 3.75 7.15 7.15...
  • Page 14 MFJ-962E Instruction Manual NOTES...
  • Page 15 MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.
  • Page 16 MFJ ENTERPRISES, INC. MFJ-962E Manual 300 Industrial Park Road Version 0A Starkville, MS39759 Printed in U.S.A.

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