Transponder Operation
SkyView HDX Pilot’s User Guide – Revision B 7-15
VFR
The VFR button controls an On/Off VFR mode. When the VFR button is selected ON – green bar
is shown at the top of the button – the transponder is automatically tuned to the VFR squawk
code. This is usually 1200 in the US and 7000 in Europe. (Refer to the Installation Guide to set
the VFR code that this button tunes.)
Once selected ON, the VFR mode will remain in effect until either of the following actions
occurs:
• Selecting the VFR button while it is ON will toggle the button and the VFR mode to OFF.
The transponder will be reset to the last discrete code tuned.
• Entering a new valid transponder code will reset the VFR button and mode to OFF.
BACK SPACE
The BACK SPACE button is selected to erase an erroneous digit while entering a new
transponder code. This action will only have effect when a partial code – containing one, two
or three digits – has been entered. Once a valid code is entered, the BACK SPACE button will
have no effect.
Number Buttons
Eight numbered buttons – “0” through “7” – are used to enter a discrete transponder code.
Enter a new code by pressing the desired 4 numbers in sequence. If you make a mistake while
entering a code, press the BACK SPACE button to erase an undesired digit. Codes that are
standardized include:
If the TRANSPONDER page is closed while an incomplete code value is shown in the upper left
corner (green text), the incomplete code is disregarded and the transponder will continue
transmitting with the last valid code entered.
SBY (Standby mode)
Select the SBY button to set the transponder to Standby mode. In Standby mode, the
transponder will not respond to interrogations from ground or airborne radar. When active,
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