User's Manual

TY91/TY92 VHF Radio Installation Manual 11 April 2012
00839-00 Issue AA
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12 Trig Avionics Limited
Applicable documents
EUROCAE ED-23C, EUROCAE ED-14F (RTCA
DO-160F), RTCA DO-186B
Software
ED-12B (RTCA DO-178B) Level B
Altitude
35,000 feet
Humidity
95% @ +50°C for 6 hours; 85% @ +38°C for 16
hours. Tested to Category A in DO-160F
Operating Temperature
-20°C to +55°C
Physical Specifications (behind the panel)
Height
44mm (1.8”)
Width
63mm (2.4”)
Length
54mm (2.1”)
Weight
0.11lbs. (90 g)
3.4 Low Voltage Operation
Normal operating voltage for the TY91 is any voltage between 11 and 33 volts,
whilst normal operating voltage for the TY92 is any voltage between 22 and 33
volts. At these voltages all functions behave normally, and transmitter power
meets the applicable Class requirements of ED-23C.
The radio will continue to operate at a lower voltage than these ranges. As the
available voltage falls, the transmitter output power will be reduced, and at 9
volts the nominal transmitter power will be approximately 2.5 watts. The
transmitter will be inhibited below 8 volts.
The receiver also works below the nominal voltage. All receiver functions will
work normally, but as a safety feature to preserve battery power in an
emergency, at 10 volts or below the available speaker volume will reduce
significantly.
In addition a warning message will be displayed on the controller when the bus
voltage falls below 10 volts in a TY91, or 18 volts in a TY92.