User's Manual Part 2

RBS 2308 and RBS 2309 User’s Guide
Table 21 Delay Spec
ifications for Different Cables
Feeder Type Andrew
Delay, ns/m
1/4-in. LDF1
3.9
1/4-in. FSJ1 (flex)
4.0
3/8-in. LDF2
3.8
3/8-in. FSJ2 (flex)
4.0
1/2-in. LDF4
3.8
1/2-in. FSJ4 (f
lex)
4.1
7/8-in. LDF5
3.7
11/4-in. LDF6
3.7
15/8-in. LDF7
3.8
Note: If the cable type is not found in the table above, the values must be
taken from the manufacturer’s specifications.
See figure in the previous chapter for feeders and jumpers
mentioned in the example.
The feeder length has been measured at 40 m.
1. Cables used:
RBS jumper (A):
Andrew 3/8-in. LDF2
Length: 2 m
The delay is 3.8 ns/m.
See the table in this chapter.
Delay for antenna jumper:
2 x 3.8 = 7.6 ns
Feeder (B):
Andrew 1/2-in. LDF4
Length: 40 m
The delay is 3.8 ns/m.
See the table in this chapter.
Feeder delay:
40 x 3.8 = 152 ns
2. Total delay:
7.6 + 152 = 159.6 ns 160 ns
3. Enter the results in the test record.
Example 3 Calculating the Total Feeder Delay
100
EN/LZT 720 0027 Uen R8A 2006-06-27