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MFJ-948 Versa Tuner II

 

WARNING:  To avoid problems, a dipole antenna should be a full half-wave on the 

lowest band.  On 160 meters, an 80 or 40 meter antenna fed the normal 
way will be extremely reactive with only a few ohms of feedpoint 
resistance.  Trying to load an 80 meter (or higher frequency) antenna on 
160 meters can be a disaster for both your signal and the tuner.  The best 
way to operate 160 with an 80 or 40 meter antenna is to load either or 
both feedline wires (in parallel) as a longwire.  The antenna will act like a 
"T" antenna worked against the station ground. 

 

Technical Assistance 
 

If you have any problem with this unit first check the appropriate section of this manual. If 
the manual does not reference your problem or your problem is not solved by reading the 
manual, you may call 

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. 
 
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, 
Starkville, MS 39759; by FAX to 601-323-6551; or by email to [email protected].  
Send a complete description of your problem, an explanation of exactly how you are using 
your unit, and a complete description of your station. 

 

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Содержание MFJ-948

Страница 1: ...he peak or average FORWARD power REFLECTED power and SWR The wattmeter is active in all the ANTENNA SELECTOR positions To use the wattmeter without the tuning circuit select one of the ANTENNA SELECTOR positions under BYPASS The meter s full scale forward and reflected power range is controlled by the left METER switch that selects 300W or 30W If your transmitter runs more than 30 watts of output ...

Страница 2: ...m eleven red SWR curves that range from 1 1 to infinity SWR is measured by observing the point where the forward and reflected power needles cross The SWR is indicated by the red curve closest to the needle crossing point No cumbersome or time consuming SWR sensitivity adjustments are required with this meter The wattmeter has an internal lamp that backlights the meter scale The lamp circuit requi...

Страница 3: ...h high RF voltages These voltages may cause serious RF burns These high RF voltages may also damage anything contacting or within a half inch of the terminals 2 Install the MFJ 948 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 3 Coaxial feed...

Страница 4: ...tance in position A and minimum inductance in position L Less inductance is needed as the frequency is increased If too little inductance is used the tuner may not match the load properly If too much inductance is used the tuner will be touchy and power handling will be compromised The chart in the tuning instructions shows typical INDUCTANCE switch settings for each amateur band NOTE If your tran...

Страница 5: ...nd ANTENNA MATCHING controls and the INDUCTOR SELECTOR switch in the bottom Tuning Chart position for the operating frequency Tuning Chart Freq MHz Transmitter Inductor Antenna 1 8 4 1 2 A 4 1 2 1 8 1 B 1 2 0 5 1 2 A 5 1 2 2 0 3 B 3 3 5 9 B 9 3 5 6 C 6 3 5 4 D 4 3 75 7 C 7 3 75 5 D 5 3 75 3 E 3 4 0 7 C 7 4 0 6 D 6 4 0 4 E 4 7 15 8 F 8 7 15 6 G 6 10 1 9 G 9 10 1 8 H 8 14 2 9 1 2 H 9 1 2 18 1 9 1 2 ...

Страница 6: ... maximum power available 7 After a low SWR is obtained the transmitter power may be increased to any value up to 300 watts carrier or 300 watts PEP Your VERSA TUNER II will reduce the SWR of most antenna systems to 1 1 In some cases a perfect 1 1 SWR may not be obtainable If this is the case the length of the antenna or the feedline can be changed slightly until a low SWR can be obtained See the a...

Страница 7: ... especially if they are all connected together with jumper wires but the best RF grounds are radial systems or multi wire counterpoises that provide large low resistance surfaces for RF energy Ground rods by themselves are almost useless for dependable RF grounding RF and lightning travels on the surface of conductors Braided or woven conductors have high surface resistance to lightning and RF Gro...

Страница 8: ...ll wave high impedance antenna 100 to 140 foot The half wave line repeats the high antenna impedance at the tuner The antenna system looks like several thousand ohms at the tuner on 40 meters 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...

Страница 9: ...stance If you have any problem with this unit first check the appropriate section of this manual If the manual does not reference your problem or your problem is not solved by reading the manual you may call 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 qu...

Страница 10: ...MFJ 948 Versa Tuner II 10 Schematic Downloaded from www g7syw com www g7syw com ...

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