Filter
Top Products
Step 14. Verify the measured insertion loss against the calculated insertion loss:
Type Attenuation (dB/ft)
´ Length (ft) = Loss (dB)
First Jumper
LDF4-50A 0.0325 20 0.65
Main Feeder
LDF5-50A 0.0186 150 2.79
Top Jumper
LDF4-50A 0.0325 10 0.325
The number of connector pairs (3) times the loss per pair (in dB) equals the con
-
nector loss: 3 ´ 0.14 = 0.42.
The insertion loss of the transmission system is equal to:
First Jumper loss + Main Feeder Loss + Top Jumper Loss + Connector Loss = Insertion Loss
0.65 + 2.79 + 0.325 + 0.42 = 4.19 dB
Figure 4-3 is an example of a typical transmission line cable loss trace.
Chapter 4 Measurements
4-6
Figure 4-3. Typical Transmission Line Cable Loss Trace