LUN 1794, is used to convert voltage signal levels from Synchro/Resolver systems to ARINC digital values corresponding to the angle measured. The device has three channels, with options for input signal types of synchro or resolver for each channel. A logical signal indicating validity is attached to each channel. The digital values are then broadcasted on the ARINC bus.
Technical parameters
Analog Input Type: Synchro (XYZ) or Resolver (SIN/COS)
Number of channels: 3 fully independent
Analog Input:
- 3x Synchro/Resolver
- 3x 26V/36V 400 Hz
- 3x reference signal, 26V/36V 400 Hz (ARINC 407 or Russian)
Digital Input:
- 3x flag input – opto isolated
Communication interface:
- ARINC 429
- RS 232 for service only
General Parameters
Input Impedance: 20 kOhm, f=400 Hz
Conversion Accuracy: ±0,3 °
Power Supply: 14…32 V DC
Power Consumption: 5 W
Operating temperature: -55 – 70 °C
Storage temperature: -55 – 85 °C
Humidity: max. 95 %
Connectors: MIL-37, CAN 9
Dimensions: 206 x 70 x 100 mm
Weight: 1500 g
Supported ARINC labels
320 – Magnetic Heading
321 – Drift Angle
324 – Pitch Angle
325 – Roll Angle
235 – Baro Correction inHg
162 – ADF Bearing
274 – Heading Status
222 – Bearing
LUN 1794 has been successfully installed on a variety of aircraft and helicopters, including L-410, L-410 UVP, Jak-40, Tu-154, An-26, L-39, MI-24, and MI-17. Other supported aicraft are listed below.
Old synchro or resolver systems, such as the LUN 1205 Electrical Gyro Horizont and Russian GMK Gyro, can serve as sources of analog signals for LUN 1794. The output ARINC interface of LUN 1794 is directly connected to safety aircraft systems i.e. from Bendix/King and Honeywell, including the EGPWS and TCAS systems.
LUN 1794 also works as a signal source for systems like heading GMK, roll, and pitch AGB-96D, AGB-3K, ARK-15, or ARK-UD.
Available variants
LUN 1794 is available in multiple variants based on available input and output types and use cases. Click on one of the variants for more information about it.
LUN 1794: Synchro/Resolver to ARINC 429
Inputs
- 3× Synchro/Resolver (ARINC 407/Russian)
Outputs
- ARINC 429 LS/HS
Most common Synchro/Resolver to ARINC 429 variant. Used as a signal source for heading, roll and pitch.
LUN 1794.1: Synchro/Resolver and Synchro DC to ARINC 429
Inputs
- 2× Synchro/Resolver (ARINC 407/Russian)
- 1× Synchro DC (DESYN)
Outputs
- ARINC 429 LS/HS
Synchro/Resolver and Synchro DC to ARINC429 variant.
LUN 1794.2: Synchro/Resolver and 1 phase gyro to ARINC 429
Inputs
- 1× Synchro/Resolver (ARINC 407/Russian)
- 2× 1 phase gyro (ECFR 251)
Outputs
- ARINC 429 LS/HS
Synchro/Resolver and 1 phase gyro (ECFR 251) to ARINC429 variant.
LUN 1794.3: Russian Synchro/Resolver to ARINC429 LS/HS OBS selector
Inputs
- 1× Russian Synchro
- Vertical deviation
- Lateral deviation
- TO/FROM signals
Outputs
- ARINC 429 LS/HS OBS selector (Resolver)
- Vertical deviation
- Lateral deviation
- TO/FROM signals
Converts analog signals of vertical deviation, lateral deviation and signals of vertical and lateral deviation validity from main output of GNS430 unit to format suitable for Russian navigation indicator NPP or similar. Converts OBS(ZK) selection from Russian NPP to GNS OBS Resolver input.
LUN 1794.4: Synchro/Resolver and Synchro DC to ARINC 429
Inputs
- 1× Synchro/Resolver (ARINC 407/Russian)
- 2× Synchro DC (DESYN)
Outputs
- ARINC 429 LS/HS
- 1x GPO Relay
Synchro/Resolver and Synchro DC to ARINC 429 variant.
LUN 1794.5: Synchro/Resolver to ARINC 429 and Synchro/Resolver (ARINC 407) to connect EHSI
Inputs
- 1× Synchro/Resolver (ARINC 407/Russian)
Outputs
- ARINC 429 LS/HS
- 1× Synchro/Resolver output (ARINC 407)
Synchro/Resolver to ARINC 429 and Synchro/Resolver (ARINC 407) to connect EHSI variant.
LUN 1794.6: Synchro/Resolver and DC Baro Correction inHg to ARINC 429
Inputs
- 2× Synchro/Resolver (ARINC 407/Russian)
- 1× DC
Outputs
- ARINC 429 LS/HS
Synchro/Resolver and DC Baro Correction inHg to ARINC 429 variant
LUN 1794.7: Synchro/Resolver to ARINC 429 to Runway Markers (GPO Relays)
Inputs
- 3× Synchro/Resolver (ARINC 407/Russian)
- ARINC 429
Outputs
- ARINC 429 LS/HS
- 3x GPO Relay
Synchro/Resolver to ARINC 429 and ARINC 429 to Runway Markers (GPO Relays)
LUN 1794.8: Synchro/Resolver, Deviation and TO/FROM signals to ARINC 429
Inputs
- 2× Synchro/Resolver (ARINC 407/Russian)
- Vertical deviation
- Lateral deviation
- TO/FROM signals
Outputs
- ARINC 429 LS/HS
Converts analog signals of vertical deviation, lateral deviation and TO/FROM signals to ARINC 429.
Examples of supported aircraft
Airplanes
L-410, L-410 UVP, L-39, An-24, An-26, An-28, Jak-40, Tu-154, Dassault Falcon 50, Mig 21, Mig 29, McDonnell Douglas MD-11
Helicopters
MI-24, MI-171, MI-171S, MI-171Sh, MI-172, MI-17V-5, MI-8, Bell Helicopters
Block diagram
