Table of Contents
Advertisement
Primary-Line SWR
Test
Specification
NOTE
Swept-Frequency Test
Description
Performance Tests
≤
1.15
To test a 775D use another good 775D as the directional coupler in Figure 8.
Refer to
Figure 8
SWR is measured by measuring return loss with a leveled source. As with
any reflectometer, first calibration is performed by reflecting all of the
signal. Then the 775D under test is connected and the SWR measured.
From a reflectometer calculator, we find that an SWR of 1.15 equals a return
loss of 23.1 dB. However, with the ambiguity of 40 dB couplers, we must
test for a return loss of 24.5 dB or greater to be sure of an SWR of 1.15.
Figure 8
Swept-Frequency Primary-Line SWR Test Setup
14 775D Operating and Service Manual
for test setup and for test equipment.
Advertisement
Table of Contents
