MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 6
d) Provide a display with the best possible viewing qualities over a wide temperature range,
taking into account operation in bright sunlight as well as low light conditions.
e) Provide a system that offers long term stability and reliability.
f) Provide a system that is easy to install and that maintains its usefulness should a different
type of engine be installed in the aircraft.
Many of the objectives have been achieved using the latest available embedded processing
devices, which result in a drastic reduction of the amount of individual components required.
This has a direct effect on improving reliability and reducing EMI (Electromagnetic
interference), long a bane of digital systems.
For the computer minded: The Stratomaster Ultra and the RDAC unit are programmed using
Embedded Pascal, a powerful and unique development system created by the same people
that designed your Stratomaster instrument! Embedded Pascal, released to the public in
1998 has become a successful development environment used in many countries.
SPECIFICATIONS:
General specifications
Size: 202x135 mm. Mounting depth 95mm (including connectors and wiring). Panel cutout
196x122 mm.
Weight: 980 grams. Excluding external senders, including RDAC unit.
Power supply requirements: 12V DC nominal. Range 7.5V DC to 18V DC. Internally
protected to 40 V DC.
Current consumption: 80 mA without back light, 280 mA with back light.
(includes current consumption of RDAC EIS unit)
Rev counter input: High impedance. Accepts signals up to 100V RMS.
Maximum frequency 10 Khz. Internally protected against over voltage.
External temperature sensor input: Optimized for National Semiconductor LM335
temperature sender.
Fuel flow sender connection: Optimized for RS 256-225 flow sender. Will accept other
senders with a 5 volt TTL output.
Engine temperature senders:
Thermocouple inputs for K or J type senders.
NTC inputs for Rotax senders and MGL senders (standard automotive senders).
Accepts MGL precision semiconductor senders for water and oil temperature (optional items)
Fuel level sender: Optimized for standard automotive level senders from 100 to 500 ohms
resistance, any slope (increasing resistance with level or decreasing resistance with level).
Alarm contacts: Uncommitted reed relay output. Recommended not to exceed 500 mA DC
current. Maximum voltage 50 volts. Please note: heavy inductive loads must be protected by
means of a reverse polarity diode in order to prevent sparks from destroying the reed relay
contacts.
Air-talk link: Two Air-talk links are provided. These are used to connect to other Air-Talk
compatible devices. Standard audio RCA cable and connectors are used as medium. Air-talk
is intended as a short distance, multi master communications link allowing Air-talk compatible
devices to share information. The Stratomaster Ultra uses the Air-talk link to connect to
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