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MFJ-945D                                                                                                     Instruction Manual 
 

You can also send questions by mail to MFJ Enterprises, INC., PO. Box 414, Mississippi State, 
MS 39762; by FAX to 601-323-6551; through Compuserve at 76206.1763; 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. 

 
 
Schematic 

 
 
 

Содержание 945D

Страница 1: ...hand FORWARD meter scale This scale is calibrated from 0 to 30 watts and is read directly in the 30 watt position In the 300W HI position the forward power scale must be multiplied by 10 Reflected power is read on the right hand REFLECTED meter scale This scale indicates 5 watts full scale when the 30W power sensitivity is selected and 50 watts full scale when the 300W power scale is selected This...

Страница 2: ...MFJ 945D Instruction Manual 2 Interconnections ...

Страница 3: ...n should be used between the coax from the tuner to the wire feed to the antenna 4 A ground post is provided for an RF ground connection Using The MFJ 945D CAUTION Never Change The Antenna or Inductor Selector Switch Position While Transmitting Never Apply More Than 300 Watts To The MFJ 945D In any conventional T network tuner maximum power handling and smoothest tuning occur when the capacitance ...

Страница 4: ... adjusted The transmitter can be touched up after the MFJ 945D is fully tuned Set the GROUND MATCHING controls at zero maximum capacitance and L minimum inductance unless you already know the correct position for the band you are using Ground matching is done after the tuner is adjusted for lowest SWR Adjustment Procedure When using the MFJ 945D for receiving only simply adjust the MFJ 945D for th...

Страница 5: ... 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 I 9 1 2 18 1 8 1 2 J 8 1 2 21 2 9 1 2 J 9 1 2 21 2 7 K 7 24 9 9 K 9 28 5 9 1 2 K 9 1 2 5 If a perfect or very low SWR can not be obtained stop transmitting Increase the INDUCTOR SELECTOR control higher letter and decrease the capacitance lower number T...

Страница 6: ... of this tuner is 300 watts on 80 meters and above and 175 watts on 160 meters If this tuner arcs at the rated power levels please double check all connections and follow the tuning procedures again Be sure you are using the highest inductance letter and the lowest capacitance number possible to match the load on the operating frequency If you are still unsuccessful but the tuner does adjust and o...

Страница 7: ...RF grounds help the signal in almost any transmitting installation it is extremely important to have good RF grounds with long wire or other Marconi style antennas Matching Problems Most matching problems occur when the antenna system presents an extremely high impedance to the tuner When the antenna impedance is much lower than the feedline impedance an odd quarter wavelength feedline converts th...

Страница 8: ... 35 60 170 195 or 210 235 feet Avoid 130 260 ft 80 meter dipole 34 40 90 102 or 160 172 feet Avoid 66 135 190 ft 40 meter dipole 42 52 73 83 112 123 or 145 155 feet Avoid 32 64 96 128 ft Some slight trimming or adding of feedline may be necessary to accommodate the higher bands 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 ...

Страница 9: ...NC PO Box 414 Mississippi State MS 39762 by FAX to 601 323 6551 through Compuserve at 76206 1763 or by email to 76206 1763 Compuserve com Send a complete description of your problem an explanation of exactly how you are using your unit and a complete description of your station Schematic ...

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