Should you use the included D15 connector harness the layout of the signals on the grey ribbon
cable is as follows:
A1
This signal is on the cable with the red marker band
C4
A2
D4
A4
Ground
B1
Ground
B2
Ground
B4
Ground
C1
Ground
C2
The ALT-4 altimeter will measure altitudes typically to around 42000 ft, however, this requires a
transponder that uses signal D4. Transponders that do not have D4 can only transmit altitudes up
to 35000 ft.
The ALT-4 produces inverted Gillman codes as required by virtually all transponders. The outputs
are open collector types and will sink currents up to 0.5A but this is not recommended in praxis.
Typical sink currents with transponders are only a few mA at the most.
It is recommended to use shielded cable for the connection between encoding altimeter and the
transponder if a long cable needs to be used. The shield should be connected to ground at one
point only (either on the encoding altimeter side or on the transponder side).
Following is a table of commonly used transponders and their Gillman code connections.
Please consult your transponders installation manual on the physical position of every contact.
Ensure that you wire the Gillman codes correctly and securely.
Installation of the wiring requires solder work. This needs to be done using electronic resin flux
solder wire and proper temperature controlled soldering stations. Do not attempt this if you are
unfamiliar with electronic soldering techniques. Please get professional assistance to do this. Bad
connections can result in your transponder broadcasting incorrect altitude codes.
Summary of Contents for Stratomaster Maxi Single ALT-3
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