User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
6--31
(e) As an example, suppose the following insertion losses have been measured:
Antenna Port Antenna Port Measured Loss
0 90 8.5 dB
0 180 5.5 dB
90 180 8.0 dB
It can be seen that when the coax connected to the 90 degree port is included in
the measurement, there is excessive loss. Simple algebra can be used to
determine that this coax has 5.5 dB of insertion loss.
NOTE: 1 dB of excessive loss in one cable can result in about 3.5 degrees of
intruder bearing error.
(14) If the VSWR tests and RF insertion loss test comply, return the d irectional antenna to
the manufacturer for further testing. Install a new directional antenna in accordance
with Aircraft Maintenance Manual procedures.