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Table of Contents
- 1 General Information
- 2 Peak Reading Swr/Wattmeter
- 3 Antenna Selector
- 4 Dummy Load
- 5 Interconnections
- 6 Installation
- 7 Using the MFJ-949E
- 8 Adjustment Procedure
- 9 Tuning Chart
- 10 In Case of Difficulty
- 11 Grounding Hints
- 12 Antenna Hints
- 13 Location
- 14 Matching Problems
- 15 Technical Assistance
- 16 Schematic
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Table of Contents
Related Manuals for MFJ MFJ-949E Versa Tuner II
Summary of Contents for MFJ MFJ-949E Versa Tuner II
- Page 1 This file was downloaded from the website of G7SYW http://www.g7syw.co.uk...
- Page 2 Instruction Manual General Information The MFJ-949E is a 300 watt RF output power antenna tuner that will match any transmitter or transceiver to virtually any antenna. Peak or average forward and reflected power and SWR can be read on the illuminated cross-needle meter.
- Page 3 The wattmeter has an internal lamp that backlights the meter scale. The lamp circuit requires power from an external 12 Vdc source, such as the optional MFJ-1312C power supply. The rear panel jack accepts a 2.5 mm coaxial plug with a positive center pin polarity.
- Page 4 RF voltages may also damage anything contacting or within a half inch of the terminals. 2. Install the MFJ-949E between the transmitter and antenna as shown in the diagram above. Use a 50 ohm coaxial cable to connect the transmitter or transceiver to the SO- 239 (UHF female) labeled TRANSMITTER on the back of the tuner.
- Page 5 5. A balanced feedline (twin lead, open wire, or twin-axial line) may be connected to the two binding posts marked BALANCED LINE. Connect a jumper wire from the WIRE binding post, as indicated by the dotted line on the MFJ-949E, to one of the BALANCED LINE posts. This connection activates the internal 4:1 balun.
- Page 6 MFJ-949E Versa Tuner II Adjustment Procedure When using the MFJ-949E in receive only applications, adjust the MFJ-949E for the highest "S" meter or signal level. The Tuning Chart can be used as a starting reference. To use the MFJ-949E for transmitting, follow the steps below: 1.
- Page 7 MFJ-949E Versa Tuner II 6. Increase the transmitter power until the Forward power level is full scale (30 watts) and observe the reflected power or SWR. If the reflected power and SWR are not satisfactory, adjust the MATCHING controls again.
- Page 8 Antenna Hints WARNING: For operator safety a good outside earth ground or water pipe ground should ALWAYS be installed and connected to the case of the MFJ-949E. 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 9 MFJ-949E Versa Tuner II The following suggestions will reduce the difficulty in matching an antenna with a tuner: 1. Never center feed a half-wave multi-band antenna with a high impedance feedline that is close to an odd multiple of a quarter-wave long.
- Page 10 MFJ Technical Service at 601-323-0549 or the MFJ Factory at 601- 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.
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Questions and answers
What is the replacement light bulb for the tuner? 12v
The original light bulb in the MFJ-949E tuner is a small incandescent bulb with an orange tinge. It can be replaced with a 3-volt LED and a resistor in series.
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