89000046-014 KSN 780/8XX/900 AeroNav AML STC Installation Manual for Helicopters
Rev 0 Page-3-7
© Honeywell International Inc. Do not copy without express permission of Honeywell.
3.4.4 Voltage Standing Wave Ratio
The VSWR should not exceed 2:1 over the VHF communication radio frequency range. A VSWR over
2:1 may result in loss in transmitting power up to 50%.
3.4.5 VHF Antenna
The VHF Communication Antenna should meet one of the following Technical Standard Orders (TSO):
TSO-C37( ), TSO-C38( ), TSO-C169( ).
3.4.6 Antenna Ground Plane
The VHF Communication Antenna should be mounted on a minimum of 18 x 18 inch metal surface or
ground plane.
3.5 Navigation Antenna
Note: This section is N/A for the AeroNav 880/780.
3.5.1 VOR/LOC Antenna
The NAV Antenna should be a standard 50Ω horizontally polarized antenna. The VOR/LOC antenna
should be installed using the manufacturer’s installation instructions and FAA AC 43.13-( ).
The VOR/LOC Antenna should meet Technical Standard Order (TSO): TSO-C36 ( ), TSO-C40 ( ).
3.5.2 Navigation Coaxial Cable
The antenna cable should be made of RG-142B, RG-400, or an equivalent 50Ω coaxial cable.
3.5.3 Navigation Coaxial Cable Connector
The connectors on the VHF navigation coaxial cable should be assembled per the connector
manufacturer’s assembly instructions.
3.5.4 Diplexer
The AeroNav XXX requires separate Glideslope and Navigation antenna inputs. A diplexer will be
required if a single navigation coax delivers both VHF navigation and Glideslope navigation signals to
the AeroNav XXX location, such as if a combined Nav/Glideslope antenna is used, or a Nav/Glideslope
diplexer is installed to combine signals at the antenna location. The diplexer should be installed per
the manufacturer’s installation manual.
3.6 Glideslope Antenna
Note: This section is N/A for the AeroNav 880/905/780.
3.6.1 Glideslope
The Glideslope Antenna should be standard 50Ω horizontally polarized antenna. The Glideslope
antenna should be installed using the manufacturer’s installation instructions and FAA AC 43.13-( ).
The AeroNav XXX has separate VOR/LOC and Glideslope antenna inputs. See Diplexer text in Section
3.5.4.
The Glideslope Antenna should also be installed with a clear line of sight. The Glideslope Antenna
should meet Technical Standard Order (TSO): TSO-C34( )
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