TY96/TY96A Installation Manual

TY96/96A and TY97/97A VHF Radio Installation Manual

01238-00

6.2.5 Frequency Step Size

22 June 2017

Issue AE

The TY96/TY97 is capable of operating in both an 8.33 kHz and 25 kHz environment. If 8.33 kHz operation is not required, the 8.33 kHz channels can be disabled to simplify the tuning operation.

Note: 8.33 kHz operation is required in some European airspace.

The TY96A/TY97A are only capable of operating in a 25 KHz environment.

6.2.6 Auxiliary Input Volume

The auxiliary input is a low-fidelity monophonic input intended for nav radio ident inputs and simple annunciators. This setting controls the relative volume of the auxiliary audio input.

6.2.7 Auxiliary Input Muting

This allows the auxiliary input to be muted when the radio is receiving or transmitting speech. Turn this feature ON if the auxiliary input is being used for non-essential services, like an MP3 player. Turn this feature OFF if the auxiliary input is being used for essential services like annunciators or traffic alerts.

6.2.8 Sidetone Volume

The audio sidetone is the transmitted audio signal; this setting controls the level of the sidetone in the headphones.

6.2.9 Receiver Squelch Offset

The receiver has a factory set nominal squelch point of approximately -95 dBm which should be appropriate for most installations. In some aircraft with noisy electrical environments, such as vintage or experimental aircraft, the factory setting may lead to nuisance squelch breaking.

The receiver squelch offset allows the installer to moderately increase the squelch set point.

6.2.10 Audio Test Tones

The audio test tones provide a simple way of testing that the installation is correctly wired. The radio has two stereo headphone outputs, a mono line output, and a cabin speaker output. The audio test tone generator sends a sequence of tones to each of those outputs in turn.

Use the small right hand knob to scroll through the output choices, and check that each output in turn is correct. The stereo music and intercom functions will appear in the wrong positions if the wiring is incorrect.

During the test the volume knob controls the active outputs.

6.2.11 Microphone gain adjustment

The factory set microphone adjustment provides a nominal sensitivity of 100 mV RMS which is compatible with most conventional aviation headset microphones. Automatic gain control takes care of variations in speaking voice and variation between different microphones. Microphone adjustment is therefore only required to correct for alternative installation choices. If the installation uses unusually high output microphones, or an audio panel with built-in amplification, the radio input can be overloaded and cause distortion on the transmitted audio. If the microphone output is too low, the transmitted modulation will be low, and may be unreadable. Each microphone input can be adjusted separately.

The microphone gain is adjusted in steps of 1 dB. The left end stop on the range corresponds to a nominal sensitivity of 200 mV; the right end stop corresponds to a nominal sensitivity of 6 mV. The factory original setting is 6 steps from the left of the range.

6.2.12 LCD Dim Point

The LCD backlight illumination is controlled automatically by the ambient light sensor. Depending on

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