Acom LS 86 Montaj Kılavuzu - Sayfa 3

Anten Acom LS 86 için çevrimiçi göz atın veya pdf Montaj Kılavuzu indirin. Acom LS 86 15 sayfaları. Hf log - periodic antenna 14 - 30 mhz

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ACOM LS86 HF Log-periodic Antenna

1.5. Location

The antenna should be mounted on a support tower structure at a height between 10 and 15 meters (33-50

ft) above the ground level. It must be located in the clear, away from trees, power installations, buildings,

other antennas etc. Such objects can be dangerous and they can reduce the antenna efficiency or cause

interference. If metal guy wires are used for the tower, they should be broken electrically with strain

insulators, at 2 meters (6 ft) apart or less.

1.6. Your first steps

The first step to installation is to fully read this manual. Then, carefully inspect the shipping cartons for any

physical damage. ACOM ships antennas in highly protected containers, but it cannot assure that

mistreatment by shippers will not occur. If there is any such damage, notify your ACOM dealer immediately.

Failure to do so may invalidate your warranty.

Select a large and clear area (8 x 11 m or 26 x 36 ft minimum) to assemble the antenna. Provide some

supports for holding the boom at a suitable working height.

The ACOM production uses metric (European) system of measurement units. The antenna elements (two

halves) and the phase-line straps are placed in separate polythene sleeves, marked respectively. The

hardware is bagged by size (there are some spares). A set of required tools to do the job is enclosed, too.

2. ASSEMBLING

The antenna comprises the following main components: boom, mast, eight elements, balun transformer, and

phase line (called also distribution feeder). The set includes also guys, installation elements, hardware, as

well as required tools.

An overall view of the antenna is shown in Fig. 1 LS86 - Appearance. All the eight elements are isolated-

mounted on the boom by eight supporting insulator blocks and each element is driven by the phase line.

2.1. Boom Assembly

The boom is composed of three pieces (sections), which are to be assembled together. The section ends to

be joined together are marked by letters A-A and B-B 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 required hardware situated along the boom sections.

Locate the three boom sections. Put them in order and orient letter markings so that "A" faces "A" and "B"

faces "B" as shown in Fig. 2 Boom Assembly.

Join together the sections marked A-A. Align the mount-hole pairs. Insert 2 bolts M6x60 mm through the

holes. Place a lock washer on each free bolt end. Screw in a nut on each bolt and tighten properly but

without losing the tubes shape.

Fit the second boom joint (B-B) together similarly. This completes the boom assembly.

2.2. Element Assembly

Each antenna element has two symmetrical halves, called half-elements hereafter. They consist of sections,

which are partly assembled in the factory to the longest suitable transportation length. The customer should

do the final assembly as described below.

For transportation, the element sections are bundled up in pairs and packed each element in a separate

polythene sleeve. The polythene sleeves are marked as follows: ELEMENT 1, ELEMENT 2, etc to

ELEMENT 8.

Note: The shortest half-elements (number 8) are fully assembled in the factory.

Locate all polythene sleeves and identify them before to start assembling. Do not take out sections of more

than one sleeve at a time to avoid mixing up of sizes and lengths.

Begin with ELEMENT 1. Put all sections in the size order. Insert the smallest-size section into the next one at

a distance of about 100 mm (4") - see Fig. 3 Element Riveting.

1mm=39.37mil 1cm=10mm=0.3937" 1m=100cm=3.281ft 1kg=2.205lbs 1m

=10.764sq.ft

1km/h=0.62137mph