TY91/TY92 VHF Radio Installation Manual 24 November 2014
00839-00 Issue AF
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44 Trig Avionics Limited
SMALL knob then steps through the individual frequencies for that airport.
After you have stepped through all the loaded airports, or if there is no GPS
attached, the built-in memory of the TC90 is displayed.
The TC90 has nine frequency memories. Each frequency position can be
selected by turning the SMALL tuning knob.
Whether from a GPS or from the onboard memory bank, the selected
frequency is loaded into the standby window. Pressing MEM again leaves the
stored frequency in the standby window. Pressing the Flip-flop button loads
the stored frequency directly into the active channel.
To store a frequency in one of the memory locations it must first be tuned and
active. Press MEM to enter the memory mode in the usual way. Select the
channel you want to overwrite with the tuning knobs. Now press, AND
HOLD, the MEM button for 2 seconds. The current active frequency will be
moved to the selected memory location, overwriting the existing contents.
8.8 Dual Control Operation
If two control heads are installed for a dual control setup then changes made to
one controller will be automatically updated on the second controller. There is
a small time lag between operating one controller and updating the display on
the second controller. This is purely a delay in the display and there is no
delay in the tuning or operation of the TY91/TY92 radio.
The exception is that the radio volume knob works on a “loudest wins” basis.
The radio volume will always correspond to the control head that has the
volume knob set to the highest position. This means that only one of the
controllers needs to be turned up to operate the radio normally, for example
when flying a tandem aircraft solo.
8.9 Dual Control Individual Functions
The following functions are local to the individual control head and will not
automatically update or transfer between two controllers:
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