Becker RT6512 Installation And Operation Manual

Remote-Controlled

Installatio n and Operation

Manual DV17501.03

VHF-AM Transceiver

RT6512

Issue 06 April 2018
Article-No. 0645.702-071

Becker Avionics GmbH • Baden-Airpark B108 • 77836 Rheinmünster • Germany

 +49 (0) 7229 / 305-0 • Fax [phone] / 305-217

http://www.becker-avionics.com • E-mail: [e-mail]

Installation and Operation

Becker Avionics

Contact Data for

America, Australia, Japan

Approved Production and Maintenance Organization

Certificates see: http://www.becker-avionics.com/company-about/ →Certificates

Germany: Becker Avionics GmbH

Baden-Airpark B108
77836 Rheinmünster (Germany)
Tel.: + 49 (0) 7229 / 305-0
Fax: + 49 (0) 7229 / 305-217
Internet: www.becker -avionics.com
Email: [e-mail]

Sales:

Email: [e-mail],

Customer Service:

Email: [e-mail]

Email: [e-mail]

WARNING - USER RESPONSIBILITY

FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS DESCRIBED
HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY
DAMAGE.

• This document and other information from Becker Avionics GmbH provide product or system
options for further investigation by users having technical knowledge.

• The user is responsible for making the final selection of the system and components. The user
has to assure that all performance, endurance, maintenance, safety requirements of the
application are met and warnings be observed.
For this the user has to include all aspects of the application to be compliant with the applicable
industry standards and the requirements of the responsible aviation authority. The product
documentations from Becker Avionics GmbH have to be observed.

• To the extent that Becker Avionics GmbH provide component or system options based upon data
or specifications provided by the user, the user is responsible for determining that such data and
specifications are suitable and sufficient for all applications and reasonably foreseeable uses of
the components or systems.

Term definition: User in the sense of user, installer, installation company.

2 RT6512 DV17501.03 Issue 06 April 2018

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Installation and Operation

Preface

Remote

Dear Customer,

Thank you for purchasing a Becker Avionics product. We are pleased that you have chosen our
product and we are confident that it will meet your expectations.

For development of our products, the gui delines for highes t quality and reliab ility have been borne in
mind, supplemented by selection of high quality material, responsible production and testing in
accordance to the corresponding standards.

Our competent customer support department will respond on any technical question you may have.
Please do not hesitate to contact us at any time.

-Controlled VHF-AM Transceiver

DV17501.03 Issue 06 April 2018 RT6512 3

RT6512 (Remote Transceiver)

without mounting tray

Installation and Operation

Becker Avionics

List of Effective Pages and Changes

Only technical relevant modifications are described in this table.

Document: DV17501.03 / issue 06 Article Number 0645.702-071

Cover Page 04/2018
Introduction 04/2018
Chapter 1 – 4 04/2018

Issue Page No.:

06

1-60 all Changed: Editorial adjustments.

-- all Added: Descriptions about RCU6512.

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© by Becker Avionics GmbH / all rights reserved

4 RT6512 DV17501.03 Issue 06 April 2018

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Installation and Operation

Table of Contents

1 General Description .................................................................................................................... 11

1.1 Introduction.................................................................................................................................. 12

1.2 Purpose of Equipment ................................................................................................................. 13

1.3 Variants Overview ....................................................................................................................... 14

1.4 Associated Device s ..................................................................................................................... 14

1.5 Scope of Functionality ................................................................................................................. 15

Receive Mode ................................................................................................................... 15

Transmit Mode .................................................................................................................. 15

Emergency Mode .............................................................................................................. 15

Audio Inputs and Outputs ................................................................................................. 16

1.5.4.1 Microphone Input ......................................................................................................... 16

1.5.4.2 Audio Input LINE IN ..................................................................................................... 16

1.5.4.3 Audio Output LINE OUT .............................................................................................. 17

Control Inputs .................................................................................................................... 17

1.5.5.1 /ON (Unit Power ON/OFF Control) .............................................................................. 17

1.5.5.2 /PTT (Push-To-Talk) .................................................................................................... 17

1.5.5.3 /COM2 (Com Addressing Line) ................................................................................... 17

1.5.5.4 /SEL422 (Serial Interface Selection Line).................................................................... 17

1.5.5.5 /RX_ATT (External RX Attenuation Control) ............................................................... 18

1.5.5.6 /SERV_EN (Enabling the Setup Modes) ..................................................................... 18

1.5.5.7 /TX-ENABLE (Enabling the TX) ................................................................................... 18

1.5.5.8 /EMERG (Enabling the Emergency Mode) .................................................................. 18

Status and Control Outputs .............................................................................................. 19

1.5.6.1 /FAILURE ..................................................................................................................... 19

1.5.6.2 RX_AGC (AGC Voltage of the RX-RF-AGC) .............................................................. 19

1.5.6.3 /SQL_EVAL ................................................................................................................. 19

Digital Interfaces to the Control Unit ................................................................................. 20

1.5.7.1 Interface ARINC 429 .................................................................................................... 20

1.5.7.2 Interface RS422 ........................................................................................................... 20

1.6 Safety-Conscious Utilization ....................................................................................................... 20

1.7 Restriction for Use ....................................................................................................................... 21

1.8 Technical Data ............................................................................................................................ 22

General Characteristics .................................................................................................... 22

Typical Power Consumption ............................................................................................. 22

Receiver Data ................................................................................................................... 23

Transmitter Data ............................................................................................................... 24

Dimensions & Weight........................................................................................................ 24

Software ............................................................................................................................ 25

Hardware .......................................................................................................................... 25

Continued Airworthi nes s ................................................................................................... 25

Environmental Conditions ................................................................................................. 26

Certifications ..................................................................................................................... 27

1.8.10.1 RT6512 meets the Requirements of: ........................................................................... 27

1.8.10.2 Guidelines followed for Design and Development ....................................................... 27

1.8.10.3 FCC Approval .............................................................................................................. 28

1.9 Order Code.................................................................................................................................. 29

RT6512 ............................................................................................................................. 29

Accessories ....................................................................................................................... 29

2 Installation .................................................................................................................................... 31

2.1 Packaging, Transport, Storage ................................................................................................... 31

2.2 Device Assignment ..................................................................................................................... 32

Scope of Delivery .............................................................................................................. 32

Additional Required Equipment (optional) ........................................................................ 32

Type Plate ......................................................................................................................... 33

Meaning of Status LEDs ................................................................................................... 33

2.3 Mounting Requirements .............................................................................................................. 34

Mounting Distance ............................................................................................................ 34

Grounding ......................................................................................................................... 34

Antenna Cables ................................................................................................................ 35

2.3.3.1 Attenuation: Cable length versus coax cable type ...................................................... 35

Antenna Installation .......................................................................................................... 36

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Installation and Operation

Becker Avionics

2.3.4.1 Required Antenna Type ............................................................................................... 36

2.3.4.2 Antenna Mounting Location ......................................................................................... 36

2.3.4.3 Recommendation for Installation of two RT6512 in one Aircraft ................................. 38

2.3.4.4 Radio Setting and Wiring for dual installation .............................................................. 38

2.4 Dimensions .................................................................................................................................. 39

RT6512 .............................................................................................................................. 39

RT6512 with Mounting Tray MT6512 ................................................................................ 40

2.5 Connector Pin Assignments ........................................................................................................ 41

Connector P1 (RT6512) .................................................................................................... 41

2.6 Equipment Configuration Samples .............................................................................................. 43

RT6512 with RCU6512 ..................................................................................................... 43

RT6512 with RMU5000 ..................................................................................................... 43

RT6512 with ARINC 429 Controller .................................................................................. 43

2.7 Aircraft Wiring .............................................................................................................................. 44

RT6512-(XX0) with RCU6512 as Primary Controller ........................................................ 45

RT6512-(XX0) with ARINC 429 Controller ........................................................................ 46

RT6512-(XX1) with ARINC 429 Controller ........................................................................ 47

2.8 Post Installation Tests ................................................................................................................. 48

Mechanical Installation and Wiring Check ........................................................................ 48

Power Supply .................................................................................................................... 48

Receiver / Transmitter Operation ...................................................................................... 48

Antenna Check .................................................................................................................. 48

Interference Check ............................................................................................................ 48

Flight Test Check .............................................................................................................. 50

3 Operating Instructions ................................................................................................................ 51

3.1 Device Description....................................................................................................................... 51

Device Assignment ........................................................................................................... 51

3.2 Operating with RCU6512 ............................................................................................................ 51

3.3 Operating with RMU5000 ............................................................................................................ 51

3.4 Operating with OEM Controller ................................................................................................... 51

3.5 Start-Up ....................................................................................................................................... 52

Built In Tests (BIT) ............................................................................................................ 52

3.5.1.1 Initiated Built In Test (IBIT) .......................................................................................... 54

3.5.1.2 Power On Built In Test (PBIT) ...................................................................................... 54

3.5.1.3 Continuous Built In Test (CBIT) ................................................................................... 54

3.5.1.4 Error Indication ............................................................................................................. 55

3.6 RS422 Protocol supported by RT6512 ....................................................................................... 57

3.7 ARINC 429 Protocol supported by RT6512 ................................................................................ 57

3.8 Contact Data ................................................................................................................................ 58

4 Index .............................................................................................................................................. 60

List of Figures

Figure 1: Standard Microphone Input Schematic ................................................................................................... 16

Figure 2: LINE_IN Schematic ................................................................................................................................. 16

Figure 3: LINE_OUT .............................................................................................................................................. 17

Figure 4: /FAILURE Output Schematic .................................................................................................................. 19

Figure 5: Type Plate (Example) .............................................................................................................................. 33

Figure 6: RT6512 with MT6512 - mounting area .................................................................................................... 34

Figure 7: Antenna Installation ................................................................................................................................. 36

Figure 8: RT6512 Dimensions (without and with Main Connector applied) ............................................................ 39

Figure 9: RT6512 with Mounting Tray MT6512 ...................................................................................................... 40

Figure 10: RT6512 with RCU6512 ......................................................................................................................... 43

Figure 11: RT6512 with RMU5000 ......................................................................................................................... 43

Figure 12: RT6512 with ARINC 429 Controller ...................................................................................................... 43

Figure 13: RT6512-(XX0) with RCU6512 as Primary Controller ............................................................................ 45

Figure 14: RT6512-(XX0) with ARINC 429 Controller ............................................................................................ 46

Figure 15: RT6512-(XX1) with ARINC 429 Controller ............................................................................................ 47

Figure 16: Thermal Behavior for TX Function ........................................................................................................ 53

6 RT6512 DV17501.03 Issue 06 April 2018

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Installation and Operation

List of Abbreviations

List of Abbreviations

A3E

Amplitude modulation double-sideband with full carrier

AGC

Automatic Gain Control

AM

Amplitude Modulation

AOC

Air Operations Centre

ARINC

Aeronautical Radio Incorporated

ARINC 429

Data bus for commercial aircraft

ATS

Air Traffic Services

BIT

Built In Test

BNC

Bayonet Neill Concelman (connector)

CBIT

Continuous Built In Test

CU

Control Unit

DAL

Design Assurance Level

DC

Direct Current

EUROCAE

European Organization for Civil Aviation Equipment

EASA

European Aviation Safety Agency

FAA

Federal Aviation Administration

IBIT

Initiated Built In Test

n/a

not applicable

LED

Light Emitting Diode

OEM

Original Equipment Manufacturer

PBIT

Power On Built In Test

PSB

Power Supply Board

PTT

Push To Talk

RCU

Remote Control Unit

RMU

Radio Management Unit

RX

Receiver

Std

Standard

TX

Transmitter

VDC

Volts Direct Current

VHF

Very High Frequency

VSWR

Voltage Standing Wave Ratio

TufLok®

Registered trademark. Thread loc kin g patch

ELASTOSIL®

Registered trademark. Silicon produ cts.

DV17501.03 Issue 06 April 2018 RT6512 7

Installation and Operation

Becker Avionics

Units

A

Ampere

mA

Milliampere

°C

Degree Celsius

dBm

Power ratio in Decibel referenced to 1 mW

dB

Decibel

ft

Foot

g

Gram

in

Inch

kHz

Kilohertz

MHz

Megahertz

mm

Millimeter

NM

Nautical Mile

kΩ

Resistance kilo Ohm

Ohm (Ω)

Resistance

ppm

Part per million

s

Second

V

Volt

mV

Millivolt

W

Watt

mW

Milliwatt

Indicates a hazardous situation which, if not avoided, will result in death or serious

Indicates a hazardous situation which, if not avoided, could result in death or

Indicates a hazardous situation which, if not avoided, could result in minor or

Is used to address practices not related to physical injury.

Safety instructions (or equivalent) signs indicate specific safety-related

Units

General Safety Instructions

injury.

serious injury.

moderate injury.

instructions or procedures.

8 RT6512 DV17501.03 Issue 06 April 2018

Becker Avionics

Installation and Operation

Disposal

The packaging material is inflammable, if it is disposed of improperly by

The device(s) may be installed on an aircraft only by an approved aeronautical

The user is responsible for a safe installation and/or additional safety measures

burning, toxic fumes may develop.

This product contains materials that fall under the special disposal regulation, which corresponds to
the EC directive for dangerous disposal material. We recommend disposing of the respective materials
in accordance with the respectively valid environmental laws.

• Dispose circuit boards via a technical waste dump which is allowed to take on e.g.
electrolytic aluminium capacitors. Do under no circumstances dump the circuit boards with
normal waste dump.

Warranty Conditions

company (e.g. EASA Part 145) which shall also examine and verify the

User conversions and changes are not permitted.

Any change on the product, made by the user, excludes any liability of Becker Avionics GmbH.

• For installation, opening the device is not required.

• Do not make any modifications to the device, except for those described in the manual.

• Make connections to the inputs, outputs and interfaces only in the manner described in

the manual.

• Install the devices according to the instructions.
We cannot provide any guarantee for other mounting methods.

installation.

Conditions of Utilization

General introductory notes
With this device you b ought a product, which was manufactured and tested before delivery with th e

utmost care.
Please take your t ime to read the f ollowing notes, whic h you should follo w closely during insta llation

and operation.
Otherwise, all claims under the warranty will become void an d a reduced service life or even parti al

damage is not excludable.

in order to prevent damages to persons or the electric installations of the
airplane. In case of deviations to the descriptions in this document perform all
work in accordance with the airplane service manual or take the AC43-13, in its
latest revision, into account.

Additional Conditions of Utilization
Please refer to "Safety-Conscious Utilization", page 20.

Non-Warranty Clause

We checked the co nte nts o f this publication for com pli ance with the associat ed h ard a nd s of tware. We
can however, not exclude discrepancies and do therefore not accept any liability for the exact
compliance. The inf ormation in this public at ion is u nde r goin g a regularly review, necessary correc tio ns
will be part of the subsequent issues of this publication.

DV17501.03 Issue 06 April 2018 RT6512 9

Installation and Operation

Becker Avionics

Blank Page

10 RT6512 DV17501.03 Issue 06 April 2018

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General Description

Introduction

1 General Description

In this chapter you can read about:

1.1 Introduction.................................................................................................................................. 12

1.2 Purpose of Equipment ................................................................................................................. 13

1.3 Variants Overview ....................................................................................................................... 14

1.4 Associated Devices ..................................................................................................................... 14

1.5 Scope of Functionality ................................................................................................................. 15

Receive Mode ................................................................................................................... 15

Transmit Mode .................................................................................................................. 15

Emergency Mode .............................................................................................................. 15

Audio Inputs and Outputs ................................................................................................. 16

Control Inputs .................................................................................................................... 17

Status and Control Outputs .............................................................................................. 19

Digital Interfaces to the Control Unit ................................................................................. 20

1.6 Safety-Conscious Utilization ....................................................................................................... 20

1.7 Restriction for Use ....................................................................................................................... 21

1.8 Technical Data ............................................................................................................................ 22

General Characteristics .................................................................................................... 22

Typical Power Consumption ............................................................................................. 22

Receiver Data ................................................................................................................... 23

Transmitter Data ............................................................................................................... 24

Dimensions & Weight........................................................................................................ 24

Software ............................................................................................................................ 25

Hardware .......................................................................................................................... 25

Continued Airworthi nes s ................................................................................................... 25

Environmental Conditions ................................................................................................. 26

Certifications ..................................................................................................................... 27

1.9 Order Code.................................................................................................................................. 29

RT6512 ............................................................................................................................. 29

Accessories ....................................................................................................................... 29

This manual describes the Becker Avionics remote-controlled VHF-AM transceiver RT6512-(XXX).
The t ype plate on your device shows the part number for identification purposes (see "T ype Plate",

page 33).
Before starting operati on of the device(s) please read t his manual c arefull y, with particul ar attention t o

the description referring to your device(s).

DV17501.03 Issue 06 April 2018 RT6512 11

General Description

Becker Avionics

Introduction

1.1 Introduction

The technical information in this document applies to the described product(s) RT6512-(XXX). For
further descriptions we are using the term RT6512 instead writing the complete model number.

If a description ref ers to only one of the product var iants its full nam e, e.g. "RT6512-(100)", will be
used.

The manuals Maintenance & Repair (M&R) and Installation & Operation (I&O) contain the following
sections:

Section

DV 17501.04

M&R

DV 17501.03

I&O

General Description X X
Installation X X
Operation Instructions X X
Theory of Operation X N/A
Maintenance and Repair X N/A
Illustrated Parts List X N/A
Modification and Changes X N/A
Circuit Diagrams X N/A
Certifications X N/A
Attachments X N/A

12 RT6512 DV17501.03 Issue 06 April 2018

Becker Avionics

General Description

Purpose of Equipment

1.2 Purpose of Equipment

The mechanical design of the remote-controlled VHF-AM transceiver RT6512 is rugge dized and well
suited for installati on in the av ion ics c ompartment (non-press ur ized a nd not temperature control led) by
means of a mounting tra y and in all types of aircraft.

The remote-controlled VHF-AM transceiver RT6512 meets RTCA and EUROCAE airworthiness
requirements applicable at the time the unit received certification. There are no restrictions for
installation of the u nit as long as it w ill be installed in areas, where data of the proven env ironmental
categories will not exceed.

• RT6512 is a simplex vo ice c ommunication system in the standard avionics VHF frequency
range 118.000...136.975 MHz (136.9916 MHz with 8.33 kHz channel spacing) or opti ona l
with extended frequency range up to 155.975 MHz and uses stan dard amplitude
modulation (A3E). RT6512 is capable to operate in both, the 25 or 8.33 kHz channel
spacing is primarily intended for aeronautical operational control (AOC) and air traffic
services (ATS) safety communications.

• RT6512 uses ARINC 429 and RS422 interfaces for communication with a co ntro l dev ice.

• RT6512 provides frequency and mode control, either by means of the Becker RCU6512 or

RMU5000 controller using the RS422 communication port, or by means of any OE

oduct using the standard ARINC 429 communication bus.

pr

• With transmitter power of 20W, RT6512 is able to support simultaneous communication
over a range exceeding 200 NM direct line of sight, within the frequency range.

M

DV17501.03 Issue 06 April 2018 RT6512 13

General Description

Becker Avionics

RT

6512

- ( X X X

)

Device

Function/Manufacturer

RCU6512

Becker Avionics Remote Control Unit

RMU5000

Becker Avionics Radio Management Unit

Control unit

Gables G7610 (Control unit for VHF-COMM only)

Control unit

Universal RCU

Glass cockpit

Genesys IDU680

Associated Devices

1.3 Variants Overview

Within the part number, the meaning of "RT6512-(XXX)", is:

Type Identifier

Model Number

1.4 Associated Devices

Following devices can operate with RT6512-(XXX):

0 – Standard
1 – with Emergency Mode

0 - Standard

1 – Std. Freq. Range 118...136.975 MHz
2 – Ext. Freq. Range 118...155.975 MHz

14 RT6512 DV17501.03 Issue 06 April 2018

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General Description

Scope of Functionality

1.5 Scope of Functionality

RT6512 performs AM (amplitude modulation) voice communication.
Mechanics: Case serves as heat sink:
Front side conta ins the main connect or for connection to the aircraft wiri ng system, and the a ntenna

jack. Three front panel LEDs indicate basic information about overall equipment status.

Receive Mode

RT6512 is equipped with a high-quality Class C, E and H2 receiver:

• Standard sensitivity 5 µV, high dynamic range, and high blocking rejection.

• It can receive a weak signal while a 2

transmitting.

• The RT6512 can operate with offset carrier in both 25 kHz and 8.33 kHz channel spacing.

Transmit Mode

RT6512 is equipped with a high-quality Class 3 and 5 transmitter:

• Output power of 20 W under standard operating conditions.

• Output power of at least 16 W under the specified environmental operating conditions

(when using antenna with VSWR≤2:1, for VSWR>3:1 outp ut po wer lowers ).

• AM depth >70% - standard value for airborne application.

• During transmission, the transmitter delivers a natural sidetone signal, which is available

on the LINE_OUT output (if enabled).

• RT6512 is equipped with a protective function to prevent from blocking the frequency
channel by a stuck transmit button or a short circuit on the key line.

• RT6512 provides status information if device is transmitting via serial protocol (RS422 and
ARINC 429). This status can be used to inform the crew about terminated transmission
(as required by TSO-C128a/ETSO-2C128).

• RT6512 transmitter is protected from overheating. VSWR on antenna connector is also
monitored. See "Status and Control Outputs", page 19 for details.

nd

VHF-AM transceiver in the same aircraft is

Emergency Mode

• The RT6512-(201) var ia nt suppor ts Em ergency Mode in which device is automaticall y tuned to
emergency channel 121.500 MHz in 25 kHz channel spacing.

• External control of transceiver is prohibited with remaining device status monitoring.

Note: Operators Remark

121.5 MHz = International voice aeronautical emergency.

123.1 MHz = International worldwide voice SAR use (e.g. Italy).

DV17501.03 Issue 06 April 2018 RT6512 15

General Description

Becker Avionics

Scope of Functionality

Audio Inputs and Outputs

1.5.4.1 Microphone Input

Figure 1: Standard Microphone Input Schematic

RT6512 is designed for a standard microphone:

• Unbalanced,

• DC coupled,

• DC supplied from RT6512.

The bias current for s tandard microphone is drawn from RT6512 internal source 15 VDC via series
resistor 470 Ohm. The inp ut audio signal is routed to a dynamic compressor keeping the modulation
factor limited over a wide input voltage range. T he microphon e input uses the c able guard as ground
compensation so microphone input shall be connected exactly as specified on Installation diagrams.

1.5.4.2 Audio Input LINE IN

The RT6512 symmetr ical line input has no DC co nnection to ground. I nput impedance is 600 Ω. The
maximum input lev el without clipp ing can be set as high as 6 V. The input audio signal is routed to a
dynamic compressor keeping the modulation factor limited over a wide input voltage range.

16 RT6512 DV17501.03 Issue 06 April 2018

Figure 2: LINE_IN Schematic

Becker Avionics

General Description

Scope of Functionality

1.5.4.3 Audio Output LINE OUT

Figure 3: LINE_OUT

The audio output LINE OUT design is symmetrical an d has no DC con necti on to gr ound. If volume set
to maximum, the audio output power delivered is 100…125 mW into 600 Ω or 200 mW into 150 Ω.

Control Inputs

1.5.5.1 /ON (Unit Power ON/OFF Control)

/ON signal to switch ON/OFF the RT6512.
The /ON line is used to activate an internal electronic switch to power-up the unit.
It is active if the level on th e /ON pin is less than 4.0 V or a resistance of less than 1 kΩ connects to

ground.
The /ON line is inactive if the level on the /ON pin is higher than 8.0 V or a resistance higher

than 50 kΩ connects to ground.

1.5.5.2 /PTT (Push-To-Talk)

/PTT is used to initiate transmission.
It is active when /PTT-input level is below 4.0 V, or a resistance to ground of less than 1 kΩ.
The /PTT line is inactive if the level on the /PTT-input is higher than 8.0 V, or a resistance higher

than 50 kΩ connects to ground.

1.5.5.3 /COM2 (Com Addressing Line)

/COM2 defines device sub address for ARINC communication.
The device detects a LOW state (Active state) on the /COM2 input when an external resistance of

lower than 1 kΩ is connected to ground.
The device detects a HIG H state (Inactive state) on the /CO M2 input when an external res istance of

higher than 50 kΩ is connected to ground.

• Com addressing line bit:

o LOW (Active) state selects COM2.
o HIGH (Inactive) state selects COM1.

1.5.5.4 /SEL422 (Serial Interface Selection Line)

/SEL422 selects RS422 or ARINC 429 communication.
The device detects a LOW state (Active state) on the /SEL422 input when an external resistance of

lower than 1 kΩ is connected to ground.
The device detects a HIGH state on the /SEL422 input when an external resistance of higher

than 50 kΩ is connected to ground.

• Serial interface selecti on line:

o LOW (Active) state selects RS422.
o HIGH (Inactive) state selects ARINC.

DV17501.03 Issue 06 April 2018 RT6512 17

General Description

Becker Avionics

For an aircraft installation /TX-ENAB L E input shall be connected to ground

Scope of Functionality

1.5.5.5 /RX_ATT (External RX Attenuation Control)

/RX_ATT reduces the RF gain of the RX section to reduce cross talk effects.
The /RX_ATT line is us ed for an optiona l desensitizati on of the RT6512 rec eiver. The des ensitization

nd

can be required wh en a 2

st

line from 1

VHF-AM trans c eiv er s ha ll be connected to /RX _ AT T input of 2nd device and / PT T from 2nd

device shall be connected to /RX_ATT input of the 1

VHF-AM transc eiver i n th e s ame aircraft is transm ittin g. In s uch c as e / PT T

st

device.

The /RX_ATT is active if /RX_ATT-input level is less than 4.0 V, or a resistance less than 1 kΩ
connects to ground.

The /RX_ATT line is inac tive if the level on the /RX_ATT -input is higher than 8.0 V, or a resistance
higher than 50 kΩ connects to ground.

1.5.5.6 /SERV_EN (Enabling the Setup Modes)

/SERV_EN enables the setup modes.
/SERV_EN is a read/write access for all setup data, not available for standard user
The device detects a LOW state (Active sta te) on the /SER V_EN input when an e xter nal res istance of

lower than 1 kΩ is connected to ground.
The device detects a HIGH state ( Inactive s tate) on the / SERV_EN input when an ex ternal r esistanc e

of higher than 50 kΩ is connected to ground.

1.5.5.7 /TX-ENABLE (Enabling the TX)

/TX-ENABLE enables the transmitter.
RT6512 detects a low state on the /TX_ENABLE in put when an external resist ance lower than 1 kΩ

connects to ground.
RT6512 is detecting high state on the /TX_ENABLE input when an external resistance higher

than 50 kΩ connects to ground. In such case transmission is permanently blocked.

directly on the main connector. / TX-ENABLE line cannot be routed as part
of installation cable bundle.

Note: Do not apply DC voltage above 5 Volts to /TX_ENABLE to avoid
device damage!

1.5.5.8 /EMERG (Enabling the Emergency Mode)

/EMERG enables the Emergency Mode for variant –(201) only.
RT6512-(201) detects a low stat e on the /EMERG in put when an external r esistance lower tha n 1 kΩ

connects to ground. In such case transceiver activates Emergency Mode operation.
RT6512-(201) is detecting high state on the /EMERG input when an external resistance higher

than 50 kΩ connects to ground.

18 RT6512 DV17501.03 Issue 06 April 2018