MFJ MFJ-1890, Instruction Manual

Final Assembly

Check the alignment of the elements and make sure all hardware is tight.  Mount the antenna
in the final location.
Connect the coax balun to a high quality low loss cable such as LMR-400 or equivalent. 

SWR Check

Resonance can be checked with an MFJ-256 or MFJ-269.  Alternately a transceiver and 
SWR meter can be used.  Resonance may be changed by adjusting the length of the elements.  
If the resonance point is too low, shorten the element length.  If the resonance point
is too high,  lengthen the element length.  

Grounding Considerations

Although this antenna is designed to operate efficiently without the requirement of an earth
ground,  safety grounding must still be provided to protect equipment, property and persons 
from the hazards fo lightning strikes and other weather related electrical discharges.  In addition,
the coaxial cable feeding the antenna should have the shield grounded to eliminate the risk of 
any indoor equipment failure allowing hazardous voltages that could create a shock hazard.
Adequate protection can be accomplished by grounding the shield of the coax to a good earth 
ground where it enters the building, or directly burying the cable in the earth for several feet
before it enters the building.  For maximum lightning protection, the coaxial cable should be
totally disconnected from the station during threatening weather conditions.

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