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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

 

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Содержание LS 108

Страница 1: ...ASSEMBLING MANUAL LS 108 HF Log Periodic Antenna 14 30 MHz ...

Страница 2: ...30 МHz continuously Gain average 9 5 dBi Front to Back Ratio 20 dB Nominal Input Impedance 50 Ohm SWR typ 1 5 1 Maximum Input Power 1500 W continuously 3000 W PEP Boom Length 8 m 26 25 ft Boom Diameter 50 mm 1 97 Mast Diameter 50 mm 1 97 Longest Element 11 m 36 1 ft Turning Radius 6 8 m 22 3 ft Wind load Area 1 5 m2 16 15 sq ft Wind Survival no ice 145 km h 90 0 mph Weight Operating 30 kg 67 lbs S...

Страница 3: ...r blocks and each element is driven by the phase line 2 1 Boom Assembly The boom is composed of four pieces sections which are to be assembled together The section ends to be joined together are marked by letters A A B B and C C directly on the tubes Sections have the element supporting insulators mast bracket balun transformer and the boom guys readily installed in the factory You will find the r...

Страница 4: ...nstallation They have the same marking 1L and 1R Lay the two half elements in the corresponding channels Select two bolts M5x60 mm and place a plain flat washer on each bolt Align the mount holes of the half elements and the insulator Push the two bolts upside down through insulator and half elements Use the holes located next to the boom Please note that the bolts heads are underside of insulator...

Страница 5: ...arest strap insulating spacer located between ELEMENT 10 and ELEMENT 9 Together with the cable fasten also the legs skirts on the two strap spacer sides see Fig 5 Phase line straps mounting Continue fastening the cable with two ties at each spacer until you reach the mast Now fasten also the strap insulating spacers in the other part of the boom although there is no cable there 2 6 Boom to Mast As...

Страница 6: ...sulator 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 electrica...

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