ACOM LS108 HF Log-periodic Antenna
bracket downwards along the mast in order to hook the guys. Unlock the shackle-locking pin. Align the
drawing bracket, shackle holes, and re-insert the locking pin. Tighten properly.
Now move the drawing bracket upwards again and stretch the guys until the boom is essentially
straightened. Tighten the two U-shaped bolts securely. When the guys are properly installed, the bracket-to-
boom distance should be at least 70 cm (2.3 ft).
With guys attached to the drawing bracket, adjust the two turnbuckles in order to get the boom accurately
horizontal. If needed, either guy length could be adjusted via loosing its wire-rope clip - see
Fig. 8 Boom
Support Assembly.
Check up whether all antenna elements are horizontal. If alignment is needed, loosen the two U-shaped
bolts of the respective element-holding insulator and get the element horizontal.
Now tighten properly all the nuts that hold the phase line (remember the caution note in
S.2.4 Attachment of
Phase-line Straps).
Do not over tight!
Check all antenna dimensions per
Table 1 - Half-Element Lengths
and
Fig. 9 LS108 Dimensional
Drawing
before to start lifting the antenna on your permanent tower structure
.
Check the quality of all mechanical and electrical joints.
Do not miss checking the hermetic seal of the coaxial connection at the balun transformer once again!
Moisture irrecoverably increases coaxial cable loss when persisting for prolonged periods and it could result
in electric breakdown in both coaxial cable and either coaxial connector.
This completes the antenna assembly. You must get acquainted with and observe the producers, safety
requirements and installation instructions about your rotator and permanent tower structure before to
continue with lifting the antenna.
END
1mm=39.37mil 1cm=10mm=0.3937” 1m=100cm=3.281ft 1kg=2.205lbs 1m =10.764sq.ft
1km/h=0.62137mph
5
2
