Microair Avionics M760 Transceiver Installation & User Manual
M760Q Install & User Manual 01R12.doc Page 8 of 36 30
th
March 2010
3.2 COAX TERMINATION
The coax is cut to length and terminated in a BNC
connector. Soldered or crimp type connectors are
preferred to the solderless variety, as they have
lower signal loss and better shielding.
Microair recommends using only soldered or
crimped BNC connectors.
Solderless BNC connectors are NOT recommended,
as their performance is not good enough for VHF
transmissions.
3.3 ANTENNA
For certified aircraft the M760 should only be
operated with a TSO compliant antenna. The
antenna may be ¼ wave whip or ½ wave dipole,
using 50ohm coaxial cable and a BNC connector for
connection. The VSWR should ideally be less than
2:1 across the 118.000MHz to 136.975MHz airband.
For non-certified aircraft using a non-TSO
compliant antenna, the VSWR must be checked to
ensure the ratio does NOT exceed 3:1 on
118.000MHz, 127.000MHz, and 136.975Mhz. The
M760 will tolerate a VSWR of 5:1 without injury to
the transceiver, but the performance is severely
deteriorated.
Do not use the stubbie “rubber duckie” antennas meant for use with handheld radios.
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