Avidyne 00060 Users Manual

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Avidyne DVX-740/750 VHF Nav/Com

Module Installation & Initial Checkou

AVIDY
CORPORATION

55 Old Bedford Road

Lincoln, MA 01773

and

420 N. Wickham Rd, Suite B

Melbourne, FL 32935

Document Number 610-00060-xxx Control Category CC2
Revision Description ECO Date

00 Release for FCC testing 6/15/2006 DCO-06-104 06/13/06
01 Revised per FCC Timco review 10/03/2006 DCO-06-211 10/09/06

Confidential property of Avidyne Corporation

Not to be disclosed without permission

DVX-740/750 VHF Nav/Com Installation & Checkout Manual

Table of Contents

1. Scope and Purpose............................................................... 3

2. Configuration of the DVX-750 Module................................. 3

3. Specification of the DVX-750 Module.................................. 5

3.1 - FAA Certification Objectives............................................................................................7

TSO Applicability..............................................................................................................7

Environmental Category................................................................................................... 8

Computer Software ..........................................................................................................9

Hardware Assurance........................................................................................................9

3.2 - FCC Certification Objectives............................................................................................9

4. Circuit Description and Theory of Operation ................... 10

5. Initial Checkout and Test Procedure................................. 17

6. Glossary............................................................................... 21

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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DVX-740/750 VHF Nav/Com Installation & Checkout Manual

1. Scope and Purpose

The purpose of this manual is to verify functionality of the DVX-750 VHF Nav/Com
radio before installation into a host PFD chassis. End user operation of the DVX-750 is
defined by the user I/O devices and displays that are provided by the host chassis.
Therefore, this is not a “User’s Manual” for the end user (customer), but provides some
direction for those who need to operate the DVX-750 module “stand-alone” during
development, certification, production, or repair activities.

2. Configuration of the DVX-740/750 Module

The DVX-750 top level module, Part# 710-00060-( ), consists of metal and mechanical
parts as captured in the top level part as well as the following internal boards:

a. RF Board, 320-00116-( )

b. DSP Board, 320-00115-( )

The DVX-740 is the same module but with the Marker Beacon receiver disabled on the
RF Board. There are no changes to the Digital Board. The BNC connector for the
Marker Beacon receiver is installed, so the external connection of the module thru the
rear panel of the chassis is the same with either configuration.

Fig 1.1 – DVX-740/750 VHF Nav/Com Module.

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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DVX-740/750 VHF Nav/Com Installation & Checkout Manual

The assembled DVX-750 slides into the host chassis, engaging the 60-pin backplane
connector which provides power and ground connections as well as the Byteflight data
interface for control (input) and data output. Installation steps are simply seating the
unit in the cardguides and ensuring that the backplane connector is engaged, then
tightening the Allen head retainer screws. After the rear panel is installed on the
chassis the BNC retainer nuts with star washers must be installed.

Figure 1.2 – DVX-750 Module installed in a Primary Flight Display (Chassis shown is
Avidyne Part#, 700-00078-000).

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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DVX-740/750 VHF Nav/Com Installation & Checkout Manual

3. Specification of the DVX-740/750 Module

The DVX-750 VHF radio module operates as an airborne VHF COMM transceiver
allowing a flight crew to aurally communicate with Air Traffic Control (ATC), other
ground stations, or different aircraft in the VHF aeronautical band. It also operates as
an airborne ILS/VOR receiver for radio aided navigation and guidance. The DVX-750
must be hosted by a PFD (Primary Flight Display) chassis, which provides conditioned
DC power and digital interface to control radio functions.

In ILS mode the VHF radio estimates own aircraft horizontal and vertical deviation
from the selected ILS localizer and glide paths. In VOR mode it estimates own aircraft
bearing to the selected VOR ground station relative to magnetic north (at the station).
In addition, any speech or identification audio signals are presented aurally to the flight
crew.

The DVX-750 radio can also operate as an airborne Marker Beacon receiver and
provides some Audio Panel functionality allowing it to interface to headsets
(microphone and headphones), a cabin speaker and a transmitter key without requiring
and audio panel.

Table 3-1. VHF Radio Characteristics Summary

Audio System 6 microphone or line in

5 headphone or line out

1 speaker out

Headphone outputs: 35mW into 150 ohm <1% THD,
65mW into 150 ohm <10% THD

Speaker output: 8W into 4 ohms

-Frequency response: 300 to 6000Hz within 6dB

Marker Beacon
Receiver
(optional)

Glideslope
Receiver

Operating frequency: 75MHz

Selectivity: 6dB at least

Sensitivity (high): 200uV (factory default)

Operating frequency: 328.60 to 335.40 MHz

Channel # / spacing: 40 channels at 150 kHz spacing

Selectivity: 6dB at least

Sensitivity (flag): 36uV max

Spurious response: -60dB or better

Centering accuracy: 0

Defection response: 67% of final value in 600msec

+10 kHz, 40dB no more than +200 kHz

+21 kHz, 40dB no more than +160 kHz

+0.02 DDM or better

Localizer Rcvr Operating frequency: 108.00 to 112.00 MHz

Channel # / spacing: 40 channels at 50 kHz spacing

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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DVX-740/750 VHF Nav/Com Installation & Checkout Manual

Selectivity: 6dB at least

Sensitivity (flag): 10uV max

Sensitivity (aural): 10uV max for 20dB (s+n)/n with 1kHz 30% mod

Spurious response: -60dB or better

Centering accuracy: 0

Deflection response: 67% of final value in 600msec

Audio response: 350 to 2500Hz <6dB, <20dB at <150Hz, >9kHz

VOR Receiver Operating frequency: 108.00 to 117.95 MHz

Channel # / spacing: 160 channels at 50 kHz spacing

Selectivity: 6dB at least

Sensitivity (flag): 5uV max

Sensitivity (aural): 5uV max for 6dB (s+n)/n with 1kHz 30% mod

Spurious response: -60dB or better

Bearing accuracy:

Audio response: 350 to 2500Hz <6dB, <20dB at <150Hz, >9kHz

VHF COMM
Digital Receiver

Operating frequency: 118.000 to 137.975 MHz

Channel # / spacing: 760/2280 channels at 25/8.33 kHz spacing

+17 kHz, 40dB no more than +80 kHz

+0.007 DDM or better

+17 kHz, 40dB no more than +80 kHz

+2.0 degrees or better

VHF COMM
Analog
Transmitter

Selectivity (8.33/25kHz): -40dB no more than

Sensitivity: 2uV max for 6dB (s+n)/n with 1kHz 30% mod

Spurious response: (S+N)/N is > 6dB for 10mV spurious signal

AGC Characteristics: <6dB audio variation from 10uV to 10mV

Squelch: Automatic with carrier override

Audio response: 350 to 2500Hz within 6dB, down 18dB at 4kHz

Frequency Range : 118.000 – 136.992

Carrier Power Output: 16W minimum, 18W typical

Emission Type: dual sideband AM, Emission Designator – 6K00A3E

DC Power to Final Amplifier: 3A @ 28V = 84W

Duty cycle: 25% (30sec transmit, 90 sec receive)

Spurious content: -60dBc or better

Modulation capability: 70% minimum, 80% limiting

Modulation Fidelity: 350 to 2500 Hz within 6dB, <20% THD

+7.37kHz /+25 kHz

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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DVX-740/750 VHF Nav/Com Installation & Checkout Manual

3.1 - FAA Certification Objectives

The VHF radio module will be developed such that the hosting integrated avionics product can
be installed and certified in Part 23, Class I, II, and III aircraft via STC or TC modification. To
achieve this end, the equipment will be certified at the equipment level via the TSO process. This
process plus the additional certification objects for this product are summarized below.

(1) FAA airworthiness approvals - This includes detailed performance and environmental
testing, as well as some additional susceptibility tests. These tests are discussed in detail in the
following sections. The FAA issues Technical Standard Orders (TSO's) that refer to the relevant
RTCA (Radio Technical Commission for Aeronautics) specifications. The RTCA documents in
turn refer to ISO (International Standards Organization), ARINC (Aviation Radio Incorporated),
and ICAO (International Civil Aviation Organization) documents.

(2) Derived functionality - Additional features not covered in the FAA standards must also be
tested (such as channel scanning, back-end interfaces, speech intelligibility enhancements, and
other value-added features).

(3) European approvals - EUROCAE (European Organization for Civil Aviation Electronics)
were allowed to comment and contribute to the RTCA documents, so there are few distinctions
to achieve European certification. One notable exception is the extended frequency coverage of
the VHF DSB-AM up to 156 MHz (which is not a part of this radio's specification).

TSO Applicability

The VHF radio, when installed in the host integrated avionics product, shall comply with the
minimum performance standards defined by the following technical standard orders (TSO):

Table 3-2. VHF Radio Required TSO Objectives

TSO

Number

TSO-C34e ILS Glide Slope Receiving Equipment Operating within the Radio

Frequency Range of 328.6-335.4 Megahertz (MHz)

TSO-C36e Airborne ILS Localizer Receiving Equipment Operating within the Radio

Frequency Range of 108-112 Megahertz (MHz)

TSO-C40c VOR Receiving Equipment Operating within the Radio Frequency Range

of 108-117.95 Megahertz (MHz)

TSO-C128 Devices that prevent blocked channels used in two-way radio

communications due to unintentional transmissions

TSO-C169 VHF Radio Communications Transceiver Equipment Operating Within

the Radio Frequency Range 117.975 to 137.000 Megahertz

The following TSOs are optional:

Table 3-3. VHF Radio Optional TSO Objectives

Subject Title

TSO No. Subject Title

TSO-C35d Airborne Radio Marker Receiving Equipment

Confidential property of Avidyne Corporation 610-00060­Not to be disclosed without permission Revision: -01 Date:10/09/2006

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