Vislink DPA3 User manual

Vislink, Waterside House, Earls Colne Business Park, Colchester, Essex, CO6 2NS, UK
Telephone: [phone] ●Facsimile: [phone] ●Email: [e-mail] ●Website: www.vislink.com
Company Registered in England & Wales no. 10523708 ●VAT registration no. GB 260 012 169
Registered Office: Waterside House, Earls Colne Business Park, Colchester, Essex, CO6 2NS, UK

Issue No: 01A Page: ii
Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
The information contained in this manual remains the property of Vislink. Do not use,
disclosed or reproduced any of its content in any other form whatsoever without the prior
written permission of Vislink.
Vislink reserves the right to alter the equipment and specification appertaining to the
equipment described in this manual without notification.
This document is supplied on the express terms that it is to be treated as confidential and
that it may not be copied, used or disclosed to others for any purpose except as authorized
by Vislink.
Add any additional Trademark content from external companies from their websites
trademark pages etc.
NOTE: Notes show to convey additional information.
CAUTION: Cautions show where potential equipment damage could occur.
WARNING: Warnings show where there is potential for personal danger or risk of death.
Read all warnings and understand them before carrying out work on any
equipment. This includes peripherals and any related equipment in use. The
danger is real and not reading and understanding the warning could lead to
injury, harm or potential death.
Region
Contact Details
Worldwide
[email protected]
[phone]
Americas
[email protected]
[phone]
When contacting Technical Support, please include the following information:
Model number and serial number of the unit (located on a label on the bottom of
each unit).
………………………………………….
Approximate date of purchase.
………………………………………….

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Version
Date
Modification
Updated By
1
03/08/2015
First release of document.
A.Jackson
01A
15/02/2017
Updated to new template. No technical change
R.Swindells

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Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
1. General Information .................................................................................................. 5
1.1. Health and Safety.......................................................................................................................5
1.2. Environmental Operating Conditions ........................................................................................5
1.2.1. Exposure to Non-ironizing (RF) radiation/Safe Working Distances...........................................5
1.3. Maximum RF Power Density Limits ...........................................................................................6
2. Introduction .............................................................................................................. 7
3. Specifications ............................................................................................................ 9
4. Monitoring and Control Functions............................................................................ 11
4.1. Front Panel Layout ...................................................................................................................11
5. Connector and Pin Outs ........................................................................................... 13
5.1. Multiway Mil-C Connector .......................................................................................................13
5.2. RF Input and Output.................................................................................................................13
5.3. Fan Power ................................................................................................................................13
6. Installation Requirements........................................................................................ 15
6.1. Handling Precautions ...............................................................................................................15
6.2. Installation................................................................................................................................15
Figure 4-1 Front Panel Layout ...................................................................................................... 11
Table 3-1 Specifications ................................................................................................................ 9
Table 4-1 Front Panel Description............................................................................................... 11
Table 5-1 Amphenol 62GB-16F14-12SN Connector Overview ................................................... 13

DPA3 Digital Power Amplifier User Manual
General Information
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Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
The personnel concerned with the operation or maintenance of the equipment must study
and understand the following health and safety information, together with local site
regulations to ensure awareness of potential hazards.
WARNING: RF Power Hazard: High levels of RF power are present in the unit. Exposure to
RF or microwave power can cause burns and may be harmful to health.
WARNING: GaAs/BeO Hazard: Certain components inside the equipment contain toxic
substances, such as Gallium Arsenide and Beryllium Oxide. While these are safe
to handle under normal circumstances, individual components must not be cut,
broken apart, incinerated or chemically processed. In the case of Beryllium
Oxide, a white ceramic material, the principal hazard is from the dust or fumes,
which are carcinogenic if ingested, inhaled or enter the body via damaged skin.
Please consult your local authority before disposing of these components.
CAUTION Tantalum Capacitors: When subjected to reverse or excess forward voltage,
ripple current or temperature these components may rupture and could
potentially cause personal injury.
CAUTION: This system contains MOS devices. Ensure you use adequate Electro-Static
Discharge (ESD) precautions to prevent accidental damage.
The safe working distance from a transmitting antenna may be calculated from the
relationship:
D =
In which:
D = safe working distance (metres)
PT = transmitter or combiner power output (Watts)
GR = antenna gain ratio = anti log (gain dBi ÷ 10)
w = power density (Watts/square metre)
The RF power density value is determined by reference to safety guidelines for exposure of
the human body to non-ionising radiation. It is important to note that the guidelines
adopted differ throughout the world and are from time-to-time re-issued with revised
guidelines. For Vislink use, apply a maximum power density limit of 1W/m² when
calculating minimum safe working distances.
WARNING: Any transmitting equipment radiating power at frequencies of 100 kHz and
higher, has the potential to produce thermal and athermal effects upon the
human body.
PT. GR
4 W

DPA3 Digital Power Amplifier User Manual
General Information
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To be safe:
a. Operators should not stand or walk in front of any antenna, nor should they
allow anyone else to do so.
b. Operators should not operate any RF transmitter or power amplifier with any of
its covers removed, nor should they allow anyone else to do so.
Worked examples:
Antenna
Transmitter Power
Type
Gain (dBi)
Gain Ratio
2W
4W
10W
30W
OMNI
4
2.5
1
1
1.5
2.5
HELIX
20
100
4
5.6
9
15.5
PARABOLIC DISH
35
3,162
22.5
32
50
87
MINIMUM SAFE DISTANCE (METRES)
The RF Radiation Power Density limit figure recommended by Vislink is based upon
guideline levels published in:
a. IEEE standard C95.1 1999 - IEEE Standard for Safety Levels with respect to
Human Exposure to Radio Frequency Electromagnetic Fields, 3kHz to 300GHz.
b. Guidelines for Limiting Exposure to Time-varying Electric, Magnetic &
Electromagnetic Fields (up to 300GHz) published in 1998 by the Secretariat of the
International Commission on Non-Ionising Radiation Protection (ICNIRP).
Both documents define guideline RF power density limits for "Controlled" and
"Uncontrolled" environments. An uncontrolled environment is defined as one in which the
person subjected to the RF radiation may be unaware of and has no control over the
radiation energy received. The uncontrolled environment conditions can arise, even in the
best-regulated operations and for this reason, the limits defined for the uncontrolled
environment are assumed for the Vislink recommended limit.
Documents a. and b. also show the RF power density guidelines to be frequency
dependent. The two documents present different power density/frequency characteristics.
To avoid complexity and areas of uncertainty, Vislink recommend the use of a single power
density limit across the frequency range of 100 kHz to 300GHz. The 1W/m² power density
limit we recommend satisfies the most stringent of the guidelines published to date.
NOTE: The IICNIRP document are free to download from the internet
(www.icnirp.de/emfgdl - PDF file). The IEEE standard is available on loan from Essex
County Library on payment of a search fee.

DPA3 Digital Power Amplifier User Manual
Introduction
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Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
Vislink designed the Digital Power Amplifier (DPA3) as an add-on to our digital transmitters
to provide increased output power. Typical applications include mobile transmitters, such
as helicopter downlinks.
The DHPA operates over frequencies between 1.3 to 7GHz, in bands, with a typical factory
set bandwidth of 400MHz and a nominal output power of up to 20W. The amplifiers
feature excellent linearity as required for COFDM digital modulation.
The unit may be powered from +20VDC to +30VDC.

DPA3 Digital Power Amplifier User Manual
Introduction
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DPA3 Digital Power Amplifier User Manual
Specifications
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Feature
Details
Frequency Band
1.3 to 7.0GHz
Output Power
Up to 20W
Linear Pre-distortion Correction
Automatically enabled
Reverse Power
Protected by circulator
Impedance
50Ω in/out
Spurious
Better than -60dBc
Gain Flatness
+/-1dB over frequency range
Gain vs. Temperature
+/-1dB over temperature range
Third Order Intercept
+62dBm
Input VSWR
1.4.1
RF Input Connector
N Type
RF Output Connector
N Type
Power Connector
MIL-C Specification
Monitoring LEDs
DC present
RF present
Load fault
Over temperature
Power Requirement
+20 to +30VDC at 150W (typical)
Weight
2.6Kg
Environmental
Safe use:
-20° to +50°C
To spec:
-10° to +45°C
Altitude:
3500m
Humidity:
95% long term
Table 3-1 Specifications

DPA3 Digital Power Amplifier User Manual
Specifications
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DPA3 Digital Power Amplifier User Manual
Monitoring and Control Functions
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The unit provides optional monitoring of output RF power in the form of open collector
logic –see Section 5.1.
The unit has no control functions other than on/off through the application of DC power
via the MIL spec connector.
Figure 4-1 Front Panel Layout
Item
Description
Notes
VSWR LED
Indicates fault on RF output.
Check load is 50Ω.
RF LED
Output RF present.
-
DC LED
DC input power present.
-
TEMP LED
PA temperature exceeds 60°C.
Check fan operation.
CIRCUIT BREAKER
DC input over-current trip.
Press to reset.
Table 4-1 Front Panel Description

DPA3 Digital Power Amplifier User Manual
Monitoring and Control Functions
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DPA3 Digital Power Amplifier User Manual
Connector and Pin Outs
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Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
Connector Type:
Amphenol 62GB-16F14-12SN
Pin
Description
A
NC
B
Forward power alarm (open collector)
C
NC +20 –30Vdc (ADL & MET Option Only)
D
NC +20 –30Vdc (ADL & MET Option Only)
E
NC +20 –30Vdc (ADL & MET Option Only)
F
NC +20 –30Vdc (ADL & MET Option Only)
G
Forward power alarm (open collector)
H
NC
J
+20 –30Vdc –STD OPTION
K
0 V
L
0 V
M
+20 –30Vdc –STD OPTION
Table 5-1 Amphenol 62GB-16F14-12SN Connector Overview
Connector Type:
N-type 50Ω
The fan derives power internally, and is always on when the unit has power connected.

DPA3 Digital Power Amplifier User Manual
Connector and Pin Outs
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DPA3 Digital Power Amplifier User Manual
Installation Requirements
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Ref: DPA3-ASUM-7xxx Copyright © 2017 Vislink plc
Should you need to make any user-changes to the unit, ensure you read and understand
the following warnings and cautions.
CAUTION: Vislink strongly recommend returning any equipment requiring RF servicing to
the factory.
CAUTION: During the insertion or removal of interface connectors ensure that the
connectors are free from debris and be sure not to damage the contact pins.
WARNING: Switch off power supplies before removing covers or disconnecting any RF
cables, and before inspecting damaged cables or antennas.
WARNING: Avoid standing in front of antennas fed by high power amplifiers and never look
into the open end of a waveguide or cable where RF power may be present.
WARNING: Wipe off any water or fluids immediately.
WARNING: Do not open or modify the assembly.
1. Refer to Section 6.1 above regarding handling precautions.
2. Secure the unit using the mounting holes in the interface plate at the base of the
unit.
NOTE: Orientation of the unit is non-specific for operation.
NOTE: The unit is fitted with a cooling fan integrated into the heat sink. Adequate free air
circulation is required around the unit to allow the fan to dissipate the heat
generated by the amplifier.
NOTE: See Section 3 (Specifications) for power consumption information.

DPA3 Digital Power Amplifier User Manual
Installation Requirements
Issue No: 01A Page: 16
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