User's Manual

Site Preparation – continued

DRAFT

4812ET RF and Power Cabinet Hardware Installation Manual

Apr 2001

It may not be necessary or desirable to run the transmission

lines in any conduit at all. In this case the transmission

lines should be protected from falling objects (i.e., ice,

etc.) or from being stepped on.

NOTE

Table 2-6: Heliax Cable Loss and Minimum Bend Radii

Heliax Motorola Part

dB loss per meter dB loss per foot Min. bend radius

Heliax

Cable

Motorola Part

No.

@ 1 GHz @ 2 GHz @ 1 GHz @ 2 GHz Metric U.S.

RG 142 CGDSRG142BU .49 .66 .15 .20 10 mm .4”

3/8” LDF N/A .115 .167 .035 .051 95 mm 3–3/4”

1/2”LDF SGDN4232A .0768 .1132 .0234 .0345 125 mm 5”

1/2” FSJ4 N/A .119 .177 .0363 .0541 13.75 mm 1.25”

7/8”LDF SGDN4234A .0430 .0646 .0131 .0197 250 mm 10”

1–1/4”LDF SGDN4235A .0317 .0476 .00967 .0145 380 mm 15”

1–5/8”LDF SGDN4233A .0269 .0410 .00819 .0125 510 mm 20”

NOTE

As an additional rule of thumb, allow 0.1 dB additional loss for each connection point.

Table 2-7: Number of wires in Conduit

Conduit

Foam Heliax Trade Size (Cable Type LDF)

Conduit

Trade Size

9.5 mm (3/8”) 12.7 mm (1/2”) 21.4 mm (7/8”) 31.8 mm (1–1/4”) 41.3 mm (1–5/8”)

2” 5 2 1 – –

2–1/2” 7 3 1 – –

3” 11 5 3 – –

4” 19 9 5 1 1

6” 20 20 12 3 2

* IMPORTANT

The values listed above were calculated based on the percent of conduit cross–section filled and recommended

limits set forth by Andrew Corporation. These limits are based on common conditions or proper cabling and

alignment of conductors where the length of pull and the number of bends are within reasonable limits. It

should be recognized that for certain conditions a larger size conduit or a lessor fill should be considered.

Power Cabinet AC Power Connection

208–240 VAC – Flexible Liquid Tight Conduit is recommended.