LUN 1794

Synchro/Resolver to ARINC converter

Lun 1794 thumbnail
LUN 1794

The converter is used to convert voltage signal levels Synchro/Resolver to ARINC digital value corresponding to the angle measured. The digital value is broadcasted on the ARINC bus. The device has three channels (3× – XYZ, 3× – reference phase) and for each channel it is possible to set the type of input signal synchro/resolver. A logical signal informing about the validity is attached to each channel.


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

The converter is also capable of performing self-diagnostics; it monitors supply voltage level and input signal or its validity. If an error is detected the converter halts and signalizes error.

LUN 1794.3 is successfully installed on L-410, L-410 UVP, Jak-40, Tu-154, An-26 and L-39 aircraft and MI-24, MI-17 helicopters.

There are many old synchro or resolver systems (LUN 1205 Electrical gyro horizont, russian GMK gyro among others) which can serve as sources of analogue signals for LUN 1794 output ARINC interface is directly connected to safety aircraft systems from Bendix/King – Honeywell (EGPWS, TCAS System).

LUN 1794 is also successfully instaled on russian Mi-171, Mi-17V-5 and Mi-24 helicopters. It works as the signal source for heading GMK and for roll and pitch AGB-96D, AGB-3K, ARK-15 or ARK-UD.


Variants specification

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 them.

LUN 1794: Synchro/Resolver to ARINC 429

Inputs

  • 3× Synchro/Resolver (ARINC 407/Russian)

Outputs

  • ARINC 429 LS/HS

Basic Synchro/Resolver to ARINC 429 variant.

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 to ARINC429 LS/HS OBS selector

Inputs

  • 1× Russian Synchro, vertical & lateral deviation

Outputs

  • ARINC 429 LS/HS OBS selector (Resolver)

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. More 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: 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.


Supported airplanes and helicopters

Aircrafts
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

lun1794 block diagram

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