DTC Communications T2071 User Manual

Derringer

Audio Transmitter

T-2071-M

DTC COMMUNICATIONS INCORPORATED

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:
1-800-233-8639
T el: 603-880-441 1
Fax: [phone]
Website: www.dtccom.com
Email: [e-mail]

486 Amherst Street
Nashua, New Hampshire 03063
USA

Copyright Notice

Copyright © 2003
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

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

2

OP1920175 Rev 1

TABLE OF CONTENTS

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.

Overview ............................................................................. 4

Quick Start........................................................................... 5

Tips..................................................................................... 6

Connections ....................................................................... 7

Specifications .................................................................. 8-9

Programming ..............................................................10-13

Accessories...................................................................... 14

Contact ............................................................................. 15

What should you expect to receive with your Derringer
transmitter?

• T2071-M Transmitter

• 2 9V Batteries

• 1 “AA” Battery Pack

• Programming Software kit with programming cable

• 36" Microphone

• Noodle antenna

• Data sheet and 1 Operator’s Manual

• Screwdriver

3

OVERVIEW

.313

.145

.210

.

00

000

.000

0

Top View

.313
.145

.200

.420

.250

.000

.210
.000

Using The Derringer

The T2071-M Derringer is a small audio transmitter which
can transmit a secure and clear audio signal. It has up to 10
programmable channels for the RF transmission,
accessed through a PC with DTC programming software
installed. The transmitter is designed for personal protec­tion and evidence gathering missions. Its miniature size
and rugged design ensures safe concealment and long­lasting performance. The frequency is programmable for

Front View

INTERNAL

MICROPHONE

ANTENNA

MULTI-PIN

CONNECTOR/

EXTERNAL

MICROPHONE

narrowband (TIA/EIA 102 compliant) or wideband operation.

.000

1.100

1.1

These parameters may be saved in memory. The Derringer
has a built-in internal microphone, the abilty to use an 36”
external microphone, and built-in scrambler.

Channel Programming Includes

• Frequency

• AGC (Automatic Gain Control) On/Of f

• Width (Narrow / Wide band)

• Scrambled / Clear Signal ON/OFF

625.625

Note: Do not operate the transmitter without the

noodle antenna installed.

NOTE: To prevent unwanted interference keep the

000

microphone and the noodle antenna separated.
Do not allow them to come into contact with each

4

.590

2.14

.2.140

other.

Using A Separate Microphone

1 Install the 36” microphone into the microphone

connector on the transmitter.

2 Install the noodle antenna into the antenna connector

on the transmitter. Adjust length according to band of
operating frequencies.

3 Attach fresh batteries to the snap on connector.
4 Using a small screwdriver, turn the recessed rotary

switch located on the front cover to the desired
channel. The configuration of each channel is
managed with DTC programming software. The
programming software included with your Derringer
allows you to assign frequencies, and set the
deviation.

The NOODLE ANTENNA

1

2

Example:
CH1: 150.000
CH2: 151.000
CH3: 152.000
Length (inches) = 2950/151
Total length = 19.5"

QUICK START

4

3

Center of operating frequency

DURCELL

PROCELL

The “noodle” antenna may be adjusted over the frequency
range of 138 MHz to 174 MHz by adjusting the amount of wire
that is folded back along side the end of the antenna. Use
heatshrink tubing to hold the adjusted length.

The total length may be calculated by the following formula.
Length (inches) = 2950 / (Freq MHz)

Length

2950 151 = 19.5

Loop

5