User's Manual

Push Buttons

IDT

Press the IDT button when ATC instructs you to “Ident” or

“Squawk Ident”. This activates the SPI pulse in the transponder

replies for 18 seconds. IDT will appear in the display.

Pressing the FUNC button provides access to changing the Flight

ID.

VFR

Pressing the VFR button sets the transponder to the pre-

programmed conspicuity code. Pressing the button again

restores the previous squawk code.

ENT

The ENT button enters a digit in the code selector.

Code Selector Knob

The right hand knob is used to set squawk codes and the Flight ID. The FN

button selects which will be updated. Turning the knob will highlight the first

digit on the display, and the digit can be changed as required. Press the ENT

button to advance to the next digit. When ENT is pressed on the last digit, the

new squawk code or Flight ID will replace the previous value. If the code entry

is not completed within 7 seconds, the changes are ignored and the previous

code restored.

1200

VFR code in the USA

7000

VFR code commonly used in Europe.

7500

Hijack code

7600

Loss of communications

7700

Emergency code

The Flight ID should correspond to the aircraft call sign entered on your flight

plan. If no flight plan is active, the aircraft registration should be used as your

Flight ID. Use only letters and digits. If the Flight ID is less than 8 characters

long, entering a blank character will end it.

Altitude Encoder Warm Up

The built in altitude encoder uses a sensor that is temperature dependent. A

small internal heater circuit keeps the sensor at the correct temperature.

When the ambient temperature is below 0C there may be a delay between

switching on the transponder and seeing an altitude reported. In very cold

weather this delay can be several minutes. You should always switch on the

transponder (usually to GND mode) before taxiing to the runway, to ensure

that the sensor is operating before you become airborne.

General Low Temperature Operation

The transponder is certified to operate correctly down to -25C, but at low

temperatures the display may be impaired. On a cold day you may need to

wait for the cockpit to warm up to ensure normal operation.