GL-T8541 PA
Glenayre Document Number: 9110.01002
CHECKOUT AND MAINTENANCE
09/10/99
Page: 7-6
Copyright © 1997 Glenayre
7.6.5 Checking Isolator Loss
This setup can also be used to determine the loss of the isolator, refer to Figure 7-4. The
RF output power of the PA Must be in calibration and set at 250 watts. This is the power
into the isolator. Table 7-2 lists the losses for a single, dual, and three section isolators, and
the power output based on 250 watts input. The loss of the isolator under test can be calcu-
lated using the formula below:
Where:
Loss
dB
= isolator loss in dB
P
in
= power amplifier output power
P
out
= isolator output power
Figure 7-4 Isolator loss Test Setup
Table 7-2 GL-T8541 PA Optional Isolator RF Power Output
Isolator Type
Insertion Loss
Output Power
(with 250 watts input)
Single section
0.35 dB
230 watts
Dual section
0.6 dB
220 watts
Triple section
0.85 dB
210 watts
Loss
dB
10
P
ou t
P
in
----------
log
=
VDT
DSP
Exciter
Power
Amplifier
Isolator
RF Wattmeter
RF Test
Load
Short length of low-loss
RF cable
