DTC VBS2-250, VBL-250, VBS-250 User Manual

DTC COMMUNICATIONS INCORPORATED PN OP1920256 REV6

VBS2-250 Frequency 2200-2300 MHz

VBS-250 Frequency 2400-2500 MHz

VBL-250 Frequency 1700-1850 MHz

1/4 W1/4 W

1/4 W1/4 W

1/4 W

att, Body Watt, Body W

att, Body Watt, Body W

att, Body W

ornorn

ornorn

orn

VV

VV

V

ideo Tideo T

ideo Tideo T

ideo T

ransmitterransmitter

ransmitterransmitter

ransmitter

ManualManual

ManualManual

Manual

DTC COMMUNICATIONS, INC.

2

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: [phone]
Fax: [phone]
Website: www.dtccom.com
Email: [e-mail]

486 Amherst Street
Nashua, New Hampshire 03063
USA

Copyright Notice

Copyright © 2002
DTC Communications, Inc. All rights
reserved. No part of this document may be
reproduced, transmitted, transcribed, stored in a re­trieval 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 war­ranties with respect to the contents hereof, and spe­cifically disclaims any implied warranties of merchant­ability 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 obliga­tion 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 prop­erties 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 pur­chase.
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 web­site at:

www.fcc.gov

You can also contact the FCC using their FAX back
service at: [phone]

Additional instructions are available by telephone at:
[phone]

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.

4

QUICK START GUIDE

1 Make sure that the ON/OFF switch is set to OFF. (Red dot is OFF).
2 Install 4 “AA” batteries in the internal battery compartment of the module.

(Lithium batteries are recommended)

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

channel number.

4 Connect an antenna to the ANTENNA connector on the module.
5 Connect the microphone or microphones to the MIC-1 and MIC-2 connectors

on the module.

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

5

7 1

4

6

3

2

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.

6

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.

8

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 BW

1.5dB

= 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 BW

1.5dB

= 6 Hz - 5.0 MHz

Input Impedance 75 Ohms
Input Level 1V

p-p

Max.

S/N 60 dB min.
Pre-Emphasis Per CCIR 405 525 line curve
Differential Gain 5%

RF

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