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The ALT-4 encoding altimeter is uncertified equipment and may normally only be used in 
uncertified aircraft, homebuilt aircraft and microlights (ultralights). Special operations permits for 
other aircraft may be required. 
 
Please be very aware that any wiring mistake related to the application of Gillman codes to your 
transponder will result in incorrect altitudes broadcast by your transponder.  
Any installation involving the CNV-ALT2 must be checked by a suitably equipped aircraft 
instrument maintenance outfit before operation. Failure to do this may be a criminal offence in 
your country. 
 

Attention: 
Your country may have regulations that do not allow you to install a transponder or an 
encoding altimeter yourself. The installation may have to be performed by an authorized 
person or company. Please check your applicable regulations with your aviation 
authorities. 

Summary of Contents for Stratomaster Maxi Single ALT-3

Page 1: ...ve altimeter In addition it offers a wide range VSI vertical speed indicator as standard option ALT 4 and ALT 5 models include a gillman code and serial transponder interface The altimeter conforms to...

Page 2: ...ce altitude in the menu This you would do if you need to set a reference that is not obtainable through your current flight profile Setting up the ALT 2 3 4 Press the Menu key to enter the menu You ca...

Page 3: ...ion number that has been determined to result in the most accurate reading of your altimeter This is the value that should be entered here Should you have access to an accurate reference you may use t...

Page 4: ...ure setting The altitude is padded with leading zeros if required to make up five digits This is followed by the letter T a the two digits 25 and a single byte checksum over all the characters in the...

Page 5: ...setting of the instrument Note that it is possible for the first altitude to be positive and the second altitude to be negative or vice versa This is then followed by the character L and a four digit...

Page 6: ...connection to a Microair T2000 transponder Other transponders are similar View of the encoder output connector of the ALT 4 from behind the instrument Pin 1 of the D15 connector is on the upper right...

Page 7: ...t 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 po...

Page 8: ......

Page 9: ...vent voltage transients in excess of this limit MGL Avionics recommends the fitment of a fuse in line with a 33V transorb available from MGL Avionics at low cost to protect electronic instruments radi...

Page 10: ...result in incorrect altitudes broadcast by your transponder Any installation involving the CNV ALT2 must be checked by a suitably equipped aircraft instrument maintenance outfit before operation Fail...

Page 11: ...tor Static port RED marker grey ribbon cable A1 C4 A2 D4 A4 C2 C1 B1 B2 B3 ground ground ground ground ground D15 connector is available on ALT 4 only Transponder interface signals RS232 RCA connector...

Page 12: ...ll not drop below 8V during operation as this may result in incorrect altitude readings Connect the static port to a suitable static air pressure line If you have a slow aircraft or an aircraft were t...

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