Motorola SC 4812ET RF Hardware Installation Manual page 44

Site Preparation
2
Heliax Heliax
Cable
RG 142 CGDSRG142BU
3/8" LDF N/A
1/2"LDF SGDN4232A
1/2" FSJ4 N/A
7/8"LDF SGDN4234A
1–1/4"LDF SGDN4235A
1–5/8"LDF SGDN4233A
NOTE
As an additional rule of thumb, allow 0.1 dB additional loss for each connection point.
Conduit Conduit
Trade Size
9.5 mm (3/8")
2"
2–1/2"
3"
4"
6"
* 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.
44
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Table 2-6: Heliax Cable Loss and Minimum Bend Radii
dB loss per meter
Motorola Part Motorola Part
No.
@ 1 GHz
.49
.115
.0768
.119
.0430
.0317
.0269
Table 2-7: Number of wires in Conduit
Foam Heliax Trade Size (Cable Type LDF)
12.7 mm (1/2")
5 2
7 3
11 5
19 9
20 20
Power Cabinet AC Power Connection
208–240 VAC – Flexible Liquid Tight Conduit is recommended.
SC 4812ET RF and Power Cabinet Hardware Installation Manual
TM
NOTE
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.
dB loss per foot
@ 2 GHz @ 1 GHz
.66 .15
.167 .035
.1132 .0234
.177 .0363
.0646 .0131
.0476 .00967
.0410 .00819
21.4 mm (7/8") 31.8 mm (1–1/4")
1
1
3
5
12
Min. bend radius
@ 2 GHz Metric
.20 10 mm
.051 95 mm
.0345 125 mm
.0541 13.75 mm
.0197 250 mm
.0145 380 mm
.0125 510 mm
41.3 mm (1–5/8")
–
–
–
1
3
DRAFT
U.S.
.4"
3–3/4"
5"
1.25"
10"
15"
20"
–
–
–
1
2
Apr 2001