Vislink DPA3 User Manual

Download

Vislink, Waterside House, Earls Colne Business Park, Colchester, Essex, CO6 2NS, UK

Telephone: +44 (0)1442 431300 ● Facsimile: +44 (0) 1494 775356 ● Email: sales@vislink.com ● 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

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

UKsupport@vislink.com

+44 (0) 1442 431410

Americas

USsupport@vislink.com

+1 978 330 9292

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.

………………………………………….

Issue No: 01A Page: iii

Version

Date

Modification

Updated By

03/08/2015

First release of document.

A.Jackson

01A

15/02/2017

Updated to new template. No technical change

R.Swindells

Issue No: 01A Page: iv

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

Issue No: 01A Page: 5

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

Issue No: 01A Page: 6

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

10W

30W

OMNI

2.5

1 1 1.5

2.5

HELIX

100

5.6 9 15.5

PARABOLIC DISH

3,162

22.5

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

Issue No: 01A Page: 7

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

Issue No: 01A Page: 8

This page is intentionally unused.

DPA3 Digital Power Amplifier User Manual Specifications

Issue No: 01A Page: 9

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

Issue No: 01A Page: 10

This page is intentionally unused.

DPA3 Digital Power Amplifier User Manual Monitoring and Control Functions

Issue No: 01A Page: 11

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

Issue No: 01A Page: 12

This page is intentionally unused.

DPA3 Digital Power Amplifier User Manual Connector and Pin Outs

Issue No: 01A Page: 13

Connector Type:

Amphenol 62GB-16F14-12SN

Description

NC B Forward power alarm (open collector)

NC +20 – 30Vdc (ADL & MET Option Only)

Forward power alarm (open collector)

NC J +20 – 30Vdc – STD OPTION

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

Issue No: 01A Page: 14

This page is intentionally unused.

DPA3 Digital Power Amplifier User Manual Installation Requirements

Issue No: 01A Page: 15

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

This page is intentionally unused.

Vislink DPA3 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual