DTC Communications VXS250 Video Transmitter User Manual VTX 1920256

DTC Communications Inc. Video Transmitter VTX 1920256

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DTC COMMUNICATIONS INCORPORATED PN OP1920256 REV6

VBS2-250 Frequency 2200-2300 MHz

VBS-250 Frequency 2400-2500 MHz

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DTC COMMUNICATIONS, INC.

How to contact DTC

For operator and troubleshooting

information, customers are encouraged to refer to

the details in this manual. For additional clarification

or instruction, or to order parts, contact DTC.

Customer Service is available Monday through

Friday between the hours of 9:00 AM and 5:00 PM

EST at:

Tel: 603-880-4411

Fax: 603-880-6965

Website: www.dtccom.com

Email: info@dtccom.com

486 Amherst Street

Nashua, New Hampshire 03063

USA

DTC Communications, Inc. All rights

reserved. No part of this document may be

reproduced, transmitted, transcribed, stored in a re-

trieval system or translated into any

language or computer language, in any form or by

any means, including but not limited to electronic,

magnetic, mechanical, optical, chemical, manual or

otherwise, without the prior written permission of DTC

Communications, Inc.

Disclaimer

The information in the document is subject to change

without notice. DTC makes no representations or war-

ranties with respect to the contents hereof, and spe-

cifically disclaims any implied warranties of merchant-

ability or fitness for a particular purpose. DTC reserves

the right to revise this publication and to make changes

from time to time in the content hereof without obliga-

tion of DTC to notify any person of such revision or

changes.

Trademarks

Trademarks of DTC Communications, Inc. include:

• DTC

• MiniPIX®

• DynaPIX®

Other product names used in this manual are the prop-

erties of their respective owners.

Warranty

DTC warrants its manufactured components against

defects in material and workmanship for a period of

two (2) years, commencing on the date of original pur-

chase.

Products manufactured by others that are approved

for use with DTC equipment are warranted for the

manufacturer’s warranty period, commencing from the

date of shipment from DTC.

FCC information

The following information is provided as a

service to our law enforcement customers who

require a Part 90 station license for video

surveillance operations using the 2450 to 2483.5 MHz

band.

You will need to provide:

• Form 600 (the application form)

Forms can be obtained from the FCC on their web-

site at:

www.fcc.gov

You can also contact the FCC using their FAX back

service at: (888) 418-3676

Additional instructions are available by telephone at:

(888) 225-5322

The filing fee form is returned to:

Federal Communications Commission

1270 Fairfield Road

Gettysburg, PA 17325-7245

DTC COMMUNICATIONS, INC. 3

Manual Conventions

NOTE Describes special issues you should be aware of

while using a particular function.

WARNING Calls out situations in which equipment

could be damaged or a process could be incorrectly

implemented, but in which operator safety is not a

factor.

TIP Describes application hints.

TABLE OF CONTENTS

RF EXPOSURE STATEMENT

When used as directed, the maximum SAR of this device is

2.7 W/kg, which meets the limits set forth by the FCC. Refer

to Appendix A in this manual for instruction in the proper use

of antennas with this device.

Quick Start ........................................................................... 4

Overview .............................................................................. 5

Features ............................................................................... 6

Specifications ....................................................................... 7

Battery Drain ........................................................................ 9

Connectors ......................................................................... 10

Connections ........................................................................11

Equipment Configurations ................................................. 13

Optional Accessories ........................................................ 14

Programming ..................................................................... 22

Appendix A ......................................................................... 26

FCC ID# H25VXS250

DTC COMMUNICATIONS, INC.

QUICK START GUIDE

1Make sure that the ON/OFF switch is set to OFF. (Red dot is OFF).

2Install 4 “AA” batteries in the internal battery compartment of the module.

(Lithium batteries are recommended)

3Using a screwdriver, turn the channel selector to the correct transmission

channel number.

4Connect an antenna to the ANTENNA connector on the module.

5Connect the microphone or microphones to the MIC-1 and MIC-2 connectors

on the module.

6Connect a video source to the Video/Multi I/O connector.

7Slide the power switch to the ON position (Green dot is ON) to apply power to

the transmitter.

Note: While installing the batteries, observe proper polarity as printed in the

battery compartment. Reverse polarity protection is a built-in design feature of

the transmitter. If a battery is installed backwards, this feature prevents the

transmitter from powering up, without damaging the transmitter or battery.

Warning: Do not apply power to the transmitter until an antenna has been

connected in step 4.

Warning: Refer to Appendix A of this manual for information on the proper

use of antennas.

7 1

DTC COMMUNICATIONS, INC. 5

OVERVIEW

What should you expect to receive with your 250mW

Transmitter?

1 VBS/VBL Video Transmitter

1 Dipole antenna with right angle SMA connector

1 One Video and Power In “Y” cable

1 DTC programming software package

1 DTC programming cable

8 Batteries

NOTE: The dipole antenna included is not recommended for normal

use! This antenna enables you to quickly set up your transmitter

and ensure proper operation. DTC highly recommends the use of

circularly polarized antennas for the best rejection of multi-path.

NOTE: DTC has provided you with a “Y” cable (power and video)

terminated with an RCA connector and a BNC adapter for your

convenience.)

The VBL/VBS series video transmitters from DTC represent the first true “video body wires” available. DTC has developed a

fully user programmable video transmitter and mated it with an integral AA battery pack. This dramatically simplifies wiring,

lowers the risk of detection, and increases the chances of operational success.

For best results, DTC recommends the use of its VidiWIRE on body dual patch antenna system with phase matching module,

and a DTC diversity receiver.

Users should also consider using the VBL/VBS series transmitters for rapid deployment drop cameras. Packaging the

transmitters with miniature board cameras is exceptionally easy, and in the case of 5 volt cameras, power may be provided to

the camera directly from the VBL/VBS transmitter’s internal battery pack.

This product in only available for sale to legitimate state, local, federal and friendly foreign government agencies.

DTC COMMUNICATIONS, INC.

FEATURES

Feature Description

Remote Switching Capability

External Power Loop Through

Programmable

Audio

Efficient Switching Power Supply

Camera Power Available through

Multi I/O Connector

•You may turn the device ON remotely, by attaching a switch to one

of the pins on the Multi I/O connector. DTC provides hard-wired and wireless

switches for this application.

• The power applied to the Multi I/O pin is automatically looped through the

unit, and available on a second pin to power a remote device, such as a

camera. If you apply 9 Volts in, you will get 9 Volts out. Applying power through

the multi I/O connector automatically disables the internal AA battery pack.

WARNING: Make sure your camera will operate on the voltage being supplied

to the transmitter.

User programmable video channels, selectable in 250 kHz steps. Two user

programmable audio sub carriers, selectable in 10 kHz steps from 6 MHz to

7.5 MHz.

• Audio sub carriers are OFF unless microphones are attached. The

transmitter automatically senses when a microphone has been attached.

• The audio sub carriers are phase locked, and will not drift into the video

signal.

• Automatic Gain Control is provided on each audio input, amplifying soft

sounds.

• They generate far less heat than a traditional video transmitters.

• They operate significantly longer than traditional video transmitters on the

same power source.

• When powering the device using the internal battery pack, regulated 5 VDC is

available on the multi I/O connector, limited to 200 mA current drain.

DTC COMMUNICATIONS, INC. 7

SPECIFICATIONS

Specifications for the body worn VBS/VBL-250

Power Supply Internal batteries 4 “AA” batteries or external 9-16 VDC.

Power Consumption 2.5 Watts (not including camera)

Battery life 3 hours - Alkaline AA

Reverse polarity

protection Yes

Dimensions 2.5 x 4.5 x 0.675”

Camera Power Using external power input: Same as supply voltage,

switched (200 mA max)

Using internal batteries: 5 VDC @ 175 mA, switched

(internal regulator)

Controls 10 channel select rotary switch

Panel mounted, slide ON/OFF switch

Connectors 2 pin Lemo: Mic 1

2 pin Lemo: Mic 2

SMA: Antenna

6 pin Multi I/O: Video in, Data in, DC input 9 -16 VDC,

camera power, Remote ON/OFF, Multiplexed Data out,

Ground

Programmability Video: 2400 - 2500 MHz (VBS-250)

1700 - 1850 MHz (VBL-250)

250 KHz resolution steps

Audio: User programmable from 6.0 - 7.5 MHz, in

10 kHz steps

Chassis notes Machined solid aluminum with rounded edges.

Audio

General Mic level input (line level factory opt.) 50 - 3000 Hz

Phased locked with AGC on both inputs. Sub-carrier auto

sensing, only active when microphone is attached.

Number of sub-carriers 2

Sub-carriers frequencies 6.0 - 7.5 MHz , user programmable

Four lithium “AA” batteries

FRONT PATCH

ANTENNA

BACK PATCH

ANTENNA

SPLITTER

CAMERA

MICROPHONES

TRANSMITTER

DTC COMMUNICATIONS, INC.

SPECIFICATIONS Sub-carrier ON/OFF

control Subcarriers are activated when mic is connected.

Subcarrier frequency

stability +/- 0.003%, -30°C to +70°C

Sub-Carrier Deviation 50 kHz peak

Audio S/N 45 dB min.

Frequency Response BW1.5dB = 50 - 3000 Hz

Total Harmonic Distortion <2%

Input Level 8 mVpp @ 400 Hz for 50 kHz peak dev.

Pre-Emphasis 75 uS

Input Impedance 10 k Ohm

Video

Video Frequency

Response BW1.5dB = 6 Hz - 5.0 MHz

Input Impedance 75 Ohms

Input Level 1Vp-p Max.

S/N 60 dB min.

Pre-Emphasis Per CCIR 405 525 line curve

Differential Gain 5%

Operating Frequency 1700 - 1850 MHz, 250 KHz resolution steps

2400 - 2500 MHz, 250 KHz resolution steps

Power output 250 mW min. @ nominal supply voltage, 25 Deg. C.

-3 dB @ 3.6 VDC int

-2 dB over temp.

Output Impedance 50 Ohms

Spurs and Harmonics

output -50 dBc

Load Pull Stability 8:1 VSWR

DTC COMMUNICATIONS, INC. 9

Frequency Stability +/- 0.003%, -30°C to +50°C

Modulation Sensitivity 8 MHz/V nom.

Modulation Sensitivity

Variation +/- 5% across the band

Peak Carrier Deviation 4 MHz nom.

Number of channels 10 max. (user programmable)

Sub-carrier sideband

level -28 dBc, +/- 2 dB

Environmental

Temperature Range -30°C - +70°C

Humidity 90% (non-condensing)

SPECIFICATIONS

Four lithium batteries

Transmitter & Camera

Battery Type Part Number Transmitter Only Camera 9V@153mA Camera 12V@120mA

9 AA Alkaline Pack 4045131 6 hours 3.3 hours 3.6 hours

(External)

9 AA Lithium 4045132 9 hours 5 hours 5.5 hours

(External)

9 AA NiMH 4045130 7 hours 4 hours 4.3 hours

Rechargeable

(External)

4 AA

(Internal)

4 AA Lithium

(Internal

DTC COMMUNICATIONS, INC.

MICROPHONE CONNECTORS

Two connectors accommodate two microphone inputs. Each connector has two

contacts and provides power to the microphone as well as connecting the audio

signal into the transmitter. The audio sub-carriers are activated by the presence of the

microphone. If a microphone is removed, that sub-carrier is removed from the

transmit signal. Turning off the unused sub-carrier saves power and improves picture

quality.

CONNECTORS

Microphone Connectors

Lemo Male Part # (FFS.01.250.DLAE31)

DTC Male Part # (8570003)

Hirose Part # HR10A-7P-6P (02)

DTC Part # 954020

Standard Male SMA connector

MATING CONNECTORS

DTC COMMUNICATIONS, INC. 11

ANTENNAS

A standard SMA connector is used as the antenna connector on both the VBS/VBL-

250. Refer to a list of DTC antennas available beginning on page 18.

TIP: You may use the VBS/VBL series transmitters with other manufacturers

antennas. Verify that they are suited for the band you are operating in.

WARNING: Refer to Appendix A of this manual for information on the proper use

of antennas.

CHASSIS MOUNTED POWER ON/OFF SWITCH

A slide switch is provided for local control of power ON and OFF. Green dot is ON,

Red dot is OFF.

NOTE: REMOTE ON overrides the chassis mounted OFF switch. (i.e. When the

chassis mounted power switch is set to OFF, REMOTE ON can be used to turn

the transmitter ON.)

CHANNEL SELECT SWITCH

Select a transmission channel by using the rotary switch located on the front surface of

the transmitter. Use a screwdriver to rotate the switch to the desired channel number.

MULTI I/O CONNECTOR

The multi I/O (6-pin Multi I/O) connector is mainly used as the video and external

power input connector. It also provides access to many transmitter functions, such as:

• Programming the device

• Video in

• Power in

• Remote on

• Camera power

CONNECTIONS

On/OFF

Switch

Antenna Connector

Channel Select

Multi I/O Connector

NOTE: Same as supply voltage. Do

not exceed 200mA.

Pin 3: Camera

Power Output

Pin 1: Ground

Pin 2: Ext power

input 9-16VDC

Pin 6: Video in

Pin 5: RS-232 in

Pin 4: Remote on,

switched to ground

DTC COMMUNICATIONS, INC.

EXTERNAL CAMERA POWER

TRANSMITTER

SPLITTER

CAMERA

FRONT PATCH

ANTENNA

BACK PATCH

ANTENNA

MICROPHONE

The basic VBS/VBL-250 configuration

consists of the video transmitter, Vidi-Wire

Antenna, and DTC cable part number

4045170-024. This cable is connected to the

multi I/O port of the transmitter, and is

configured to supply:

• The video signal from the camera to the

transmitter.

• Power to the transmitter through the

internal battery pack.

NOTE: You will need external camera

power if voltage to the transmitter is not

compatible with your camera’s operating

voltage, and/or you need greater battery

life, and/or your camera draws more than

200mA.

DTC COMMUNICATIONS, INC. 13

The basic VBS/VBL-250 configuration consists

of the video transmitter, Vidi-Wire Antenna, and

DTC cable part number 4045194-024. This

cable is connected to the multi I/O port of the

transmitter, and is configured to supply:

• The video signal from the camera to the

transmitter.

• Power to the transmitter and camera

through the internal battery pack.

FRONT PATCH

ANTENNA

BACK PATCH

ANTENNA

SPLITTER

CAMERA

MICROPHONES

TRANSMITTER

TRANSMITTER AND CAMERA (INT)

DTC COMMUNICATIONS, INC.

EXTERNAL TRANSMITTER POWER The VMS/VML-250 configuration, which uses

the loop through power source for the camera,

consists of the video transmitter and DTC cable

part number 4045189-024 . This cable is

connected to the multi I/O port of the transmit-

ter.

It is configured to supply:

• The video signal to the transmitter

from the camera.

• Power to the transmitter through a

molex connector that can be easily

connected to DTC’s battery packs.

• Power to the camera through a

molex connector that can easily be

connected to DTC’s optional

cameras.

CAMERA

ANTENNA

POWER SOURCE

for transmitter only,

9-16 V.

STRIPPED AND

TINNED LEADS

STANDARD

OPTIONAL

BATTERY

PACKS

TRANSMITTE

A4045131 (AA non-rechargeable)

B4045177( D-Cell battery pack)

Alkaline

C4045130 (AA rechargeable)

MiMH

DTC COMMUNICATIONS, INC. 15

NOTE: You will need external camera power if

voltage to the transmitter is not compatible

with camera’s operating voltage, and/or you

need greater battery life, and/or your camera

draws more than 200mA.

This configuration consists of the video transmitter,

Vidi-Wire antenna, and DTC cable part number

4045192-024. This cable is connected to the multi/

IO port of the transmitter, and is configured to

supply:

• The video signal from the camera to the

transmitter.

• Power to the transmitter and camera through

the internal battery pack.

• Remote on function through a hard wired

switch or remote Key FOB transmitter. This

remote on function overrides the OFF switch

located on the transmitter chassis.

ADDING REMOTE ON FUNCTION TO BASIC

FRONT PATCH

ANTENNA

BACK PATCH

ANTENNA

SPLITTER

CAMERA

MICROPHONES

TRANSMITTER

HARD WIRED

SWITCH

KEY FOB

SWITCH

RECEIVER

KEY FOB

SWITCH

TRANSMITTER

STRIPPED AND

TINNED LEADS

STANDARD

DTC COMMUNICATIONS, INC.

ACCESSORIES Part Number Description

1088185 Vidi Vest™

The VidiVest™ is designed to be used in conjunction with

DTC’s body worn video transmitter. The vest supplies

compartments for the video transmitter, associated wiring,

antenna system (i.e. VidiWire™), microphones, and a button

camera. The garment is ventilated for comfort and can be

adjusted with velcro straps at the waist and shoulders. The

vest is intended to be worn as an undergarment with a loose

fitting shirt or other garment over the vest.

4045181 Camera with 3-pin connector

Assembly

This camera is a high-resolution color CCD type, which has

been modified to look like a shirt button. This allows for easy

concealment through a regular button hole.

4045192-024 VidiVest cable harness

This cable harness connects all of the components, such as,

the transmitter, battery packs, microphones, and VidiWire

antenna system.

DTC COMMUNICATIONS, INC. 17

Part Number Description

VW-ANT-2-SMA VidiWire antenna system 2.4-2.5 GHz

VW-ANT-1-SMA VidiWire antenna system 1.7-1.9 GHz

The VidiWire™ antenna system was specifically designed for video transmission

from on-body transmitters. This DTC Proprietary system provides the best

possible omnidirectional video transmission from a body-worn system. The

system is composed of three parts: two special patch-type antennas, and a

phasing module.

WARNING: VidiWire Antennas are housed in a milled aluminum cover which

shields the wearer from RF energy. Make sure the antennas radiating side is

directed away from the body.

WARNING: Do not use the VidiWire antenna system on the body with any

transmitter outputting more than 250mW of RF energy.

COMPONENTS

WARNING: Refer to Appendix A of this manual for information on the proper

use of antennas.

Specifications

Type DTC proprietary

VidiWire™ design

Polarization Dual Polarized

Peak Gain Pseudo-Isotropic

Horizontal Beamwidth Omnidirectional

Vertical Beamwidth Omnidirectional

Nominal Impedance 50 Ohms

Groundplane Requirements Not applicable

Size Antennas: 2.0” W x 2.0” H x 0.25” D

(51 mm x 51 mm x 6.35 mm)

Phasing Unit 2.0” W x 1.5” H x 0.25” D

(51mm x 38mm x 6.35mm)

Net Weight 6oz

VW-ANT-2-SMA 2.4 to 2.5 GHz SMA male connector

VW-ANT-2-TNC 2.4 to 2.5 GHz TNC male connector

VW-ANT-1-SMA 1.7 to 1.9 GHz SMA male connector

DTC COMMUNICATIONS, INC.

ACCESSORIES Part Number Description

4045170-024 Video In, 24”standard.

Video In: Multi I/O to RCA(M) with BNC

adaptor. (YELLOW)

4045193-024 Video In/Remote On, 24”standard.

Video In: Multi I/O to RCA(M) with BNC

adaptor. (YELLOW)

Remote On: 24 AWG wire with a molex

connector and stripped and tinned leads. (GREEN)

4045189-024 Video In/EXT Power/Camera Power cable, 24”standard.

Video In: Multi I/O to RCA(M) with BNC

adaptor. (YELLOW)

Ext. Power: 24 AWG wire with a molex connector

and stripped and tinned leads. (RED)

Camera Power:24 AWG wire with a molex

connector and stripped and tinned leads.(GRAY)

DTC COMMUNICATIONS, INC. 19

ACCESSORIES

Part Number Description

4045194-024 Video In/Camera Power, 24”standard.

Video In: Multi I/O to RCA(M) with BNC

adaptor. (YELLOW)

Camera Power: 24 AWG wire with a molex

connector and stripped and tinned leads. (GRAY)

4045192-024 Video In/Camera Power/Remote On, 24”standard.

Video In: Multi I/O to RCA(M) with BNC

adaptor. (YELLOW)

Camera Power: 24 AWG wire with a molex

connector and stripped and tinned leads.(GRAY)

Remote On: 24 AWG wire with a molex

connector and stripped and tinned leads. (GREEN)

DTC COMMUNICATIONS, INC.

ANTENNAS Part Number Description

VDAR-1 Single 5 dBic “Hybrid-Patch”™ Antenna with mounting

options.

Connector: TNC Female on chassis

The VDAR video antennas are designed to operate with traditional single video

receivers and multiple antenna configurations for diversity receivers. The antenna

uses the DTC Hybrid-Patch system to ensure high purity circular polarization. This

ensures the highest possible performance in video reception, especially in

diversity systems. It is available in three different bands. Reversible and adjust-

able suction cup mounts come standard for quick and easy installation on the

inside or outside of window or other hard, smooth surfaces.

VDAR-1

Specifications

Type Three Hybrid Patch™

elements

Polarization RHCP

Peak Gain 5dBic

Horizontal Beamwidth 90°

Vertical Beamwidth 90°

Nominal Impedance 50 Ohms

Groundplane Req. Built-in

Size 6.6” H x 6.6” W

(167mm x 167 mm)

Weight 12 Oz. (34g)

DTC Part Number Frequency Range

7011156-1 1700 to 1850 MHz

7011156-3 1990 to 2110 MHz

7011156-2 2400 to 2500 MHz WARNING: Refer to Appendix A of this manual for information on the proper

use of antennas.

DTC COMMUNICATIONS, INC. 21

ANTENNAS

Part Number Description

QHA-4 Quadrifilar Helix Antenna with Ring-Hybrid feed

Connector: TNC Female

Must be used with SMA to TNC antenna cable

(4045174-006).

The QHA family of antennas was developed to provide a compact solution for

pattern-tailored circularly polarized antennas. This rugged antenna is omnidirec-

tional when the antenna is vertical. The pattern is slightly elevated to allow

overhead coverage. The base of the antenna includes a special flat with #10-32

threaded hole, 0.25-in. deep for mounting. It is available in both RHCP and

LHCP versions.

WARNING: Refer to Appendix A of this manual for information on the proper

use of antennas.

QHA-4 Specifications

Type Quadrifilar Helix with

Ring-hybrid feed

Polarization Circular

Peak Gain 4dBiC at 24° above

horizon

Horizontal Beamwidth Omnidirectional

Vertical Beamwidth 46°

Nominal Impedance 50 Ohms

Groundplane req. Not Required

Size 8.0” L x 1.25” dia

(203 mm x 32 mm dia)

Weight 3.7 oz. (105 g)

DTC Part Number Frequency Range

QHA-4-2-R 2.4 to 2.5 GHz, RHCP

QHA-4-2-L 2.4 to 2.5 GHz, Lhcp

DTC COMMUNICATIONS, INC.

ANTENNAS

ANT-5-PIG 5 dBi Patch Antenna Connector: SMA or TNC Male on

18" coax. “pigtail”.

DTC has developed a series of circularly polarized patch antennas for use in the

2.0 to 2.5 GHz indoor and short term outdoor installations. The ANT-5-P is a 5dbi

gain, 90 degree wide beamwidth, antenna, mounted on a 0.125 in. thick alumi-

num plate. Typical uses include disguised transmitters and vehicular-mounted

transmitter antennas and in a variety of receive applications.

Part Number Description

Specifications

Type Patch antenna with integral

ring hybrid

Polarization RHCP

Peak Gain 5dBic

Horizontal Beamwidth 90°

Vertical Beamwidth 90°

Nominal Impedance 50 Ohms

Groundplane Req. Built-in

Size 4.0” W x 4.0” H X 0.625” D

(102mm x 102mm x 16mm)

Weight 6.4 Oz. (180 g)

DTC Part Number Frequency Range

ANT-5-P-SMA 2.0 to 2.5 Ghz with SMA

male connector

ANT-5-P-TNC 2.0 to 2.5 Ghz with TNC

with male connector

WARNING: Refer to Appendix A of this manual for information on the proper

use of antennas.

Ant-5P

DTC COMMUNICATIONS, INC. 23

ANTENNAS

Part Number Description

ANT-10 9dBic Wideband Panel Connector: TNC Female

DTC has developed a series of circularly polarized panel antennas for use in

wideband transmit and receive applications from 1.7 to 2.7 GHz. The ANT-10-R

is a very wide bandwidth, unidirectional log-spiral array. This antenna has

useful gain, with some sidelobe variation, to 4 GHz. It can be mounted to a wall

or swivel mounted with the MAF-1 grip on two surfaces, via two pairs of “1/4-20”

tapped holes located in the rear center and the bottom center of the aluminum

housing. The front of the antenna is a radome made of a polycarbonate

material. The antenna is suitable for indoor and short-term outdoor use. It must

be protected for extended outdoor use and installations since it is not water- Specifications

Type Log-spiral slot array, absorber

loaded

Polarization RHCP

Peak Gain 9dBic

Horizontal Beamwidth 30°at 2.0 GHz

Vertical Beamwidth 30°at 2.0 GHz

Nominal Impedance 50 Ohms

Groundplane Req. Not required

Size 9” W x 9” H x 1.2” D

(227mm x 227 mm x 30 mm)

Weight 1.7 lb. (750g)

DTC Part Number Frequency Range

4044411 1.7 to 2.7 GHz; RHCP

7011142 1.7 to 2.7 GHz; RHCP with

MAF - 1 grip included

WARNING: Refer to Appendix A of this manual for information on the proper

use of antennas.

Ant-10

DTC COMMUNICATIONS, INC.

Introduction

DTC has built in a lot of flexibility in the programming options you have on the VBL

and VBS series transmitters. You can choose to use some, all or none of this

flexibility.

When you order a VBL or VBS transmitter, DTC will factory program your frequen-

cies at no additional charge to you. You may want to place a sticker over the

rotary switch on the chassis, so users in the field don’t attempt to change frequen-

cies. This is often the best path for state and local agencies with limited frequen-

cies available to them.

DTC will also provide you with free software and a free programming cable,

enabling you to change your video frequencies and their associated audio sub-

carriers. This is ideal if you often work with other agencies, or anticipate the

equipment being used by a multi-jurisdictional task force. You can program up to

ten channel settings per unit. In general, this allows you to program most varia-

tions you might encounter in the field at the depot level.

As a practical matter, your VBL or VBS transmitter’s video frequencies and audio

sub-carriers will be dictated by the frequency and sub-carriers(s) of your receiver

and/or repeater. In many cases, these devices are crystal controlled or have few

channel options.

TIP: Make sure that you program your transmitter to match the frequencies

and audio sub-carriers or your receiver, and test the components as a

system prior to going into the field!

PROGRAMMING

DTC COMMUNICATIONS, INC. 25

PROGRAMMING

Installing DTC Universal Programming Software on your PC

NOTE: Uninstall any previous versions by going to Add/Remove Programs,

clicking on DTC Universal Programming, and clicking on uninstall.

1Click on Start, click on run.

2Click on the Browse button.

3Click on or find your CD drive.

4Install the JAVA Runtime Environment Application first (CD provided).

5Follow the install wizard screens.

6Install the Universal Programming software next (floppy provided).

7Click on Start, click on run.

8Click on the Browse Button.

9Click on your floppy drive.

10 Double click on the setup.

11 Follow the install wizard screens.

Your programming software is installed.

DTC COMMUNICATIONS, INC.

PROGRAMMING

SERIAL PORT OF

COMPUTER

COM1 OR COM2

1Make sure the video transmitter ON/OFFswitch is set to OFF. The red dot is

OFF.

2Make sure the transmitter has an antenna installed into the antenna connec-

tor prior to programming.

3Install the programming cable into the Multi I/O connector on the transmitter.

4Plug the serial cable of the programming cable

into the COM1 or COM2 port of your computer.

5Turn the transmitter switch to ON. The green dot

is ON.

6Select Start, programs, DTC communications on

your computer.

7The system allows you to select device COM1 or

COM2, depending on which serial port you are

connected to.

8Follow the instruc-

tions on the DTC

Universal Program-

ming screens to

begin the download

process.

DTC COMMUNICATIONS, INC. 27

9Click on the “Tx Channel” tab in the programmer screen.

10 Select a channel and click on the Edit Channel button to change settings.

11 Enter your new frequency and settings.

12 To change any of the MIC-2 or MIC-1 settings, click on the settings provided,

then click OK.

13 Click on the Upload button to upload your new settings to the transmitter.

Your new settings have been installed.

PROGRAMMING

DTC COMMUNICATIONS, INC.

APPENDIX A Using Antennas with the VBS/VBL-250 Video Transmitter

Bodyworn applications:

When the VBS/VBL-250 video transmitter is to be worn on the body, only the DTC

VidiWire antenna system should be used. This antenna has been extensively

tested and found to be safe when used as directed. The antennas used in the

VidiWire system are clearly labeled as to which side of the antenna should be

placed against the body. These directions must be observed to insure safe and

effective operation.

Non-portable applications:

In fixed location applications any suitable antenna may be used. However, to

insure safe operation, it is imperative that proper spacing be maintained between

the radiating surface of the antenna and any persons body. The required spacing

depends on the RF output power of the transmitter and the gain of the antenna

being used. The chart below shows the correct minimum spacing for antennas

used with the VBS/VBL-250 transmitters. If the gain of the antenna is unknown,

contact the manufacturer of the antenna for this information. To insure that proper

spacing is maintained, locate the transmitter or arrange physical barriers in such

away that people are prevented from approaching too closely.

DTC COMMUNICATIONS, INC. 29

APPENDIX A

Minimum Allowable Spacing Between the Antenna and the Human Body

(VBS/VBL-250 Video Transmitter)

0 5 10 15 20 25

Antenna Gain (dB)

Minimum Spacing (inches)

Using Antennas with the VBS/VBL-250 Video Transmitter

486 Amherst Street • Nashua, New Hampshire 03063 • 603-880- 4411 www.dtccom.com

DTC Communications VXS250 Video Transmitter User Manual VTX 1920256

DTC Communications Inc. Video Transmitter VTX 1920256

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