DTC Communications T2350 T-2350 1Watt Audio Transmitter User Manual T2300manual 2

DTC Communications Inc. T-2350 1Watt Audio Transmitter T2300manual 2

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Users Manual

DTC COMMUNICATIONS INCORPORATED Draft

T-2350-1Watt

Audio Transmitter

PrPr

Project 25 Digital & Analogoject 25 Digital & Analog

oject 25 Digital & Analogoject 25 Digital & Analog

oject 25 Digital & Analog

Users ManualUsers Manual

Users Manual

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

warranties with respect to the contents hereof, and

specifically disclaims any implied warranties of mer-

chantability 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.

Intellectual Property Rights

Notice

Digital Voice Systems, Inc. (DVSI) claims

certain rights, including patent rights under

US Patents #5,870,405, #5,826,222,

#5,754,974, #5,701,390, #5,715,365,

#5,649,050, #5,630,011, #5,581,656,

#5,517,511, #5,491,772, #5,247,579,

#5,226,084, #5,195,166, and under other US

and foreign patents patents and patents

pending, in IMBE Vocoder technology and

software embedded in this product. Any

use of this technology or software requires

a separate written license grant

from DVSI.

IMBE is a registered trademark of Digital

Voice Systems, Inc.

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.

Manual Conventions

Table of Contents

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

Connections ...................................................................... 5

Quick Start Option 1 .......................................................... 6

Quick Start Option 2 .......................................................... 7

miniSDTM Card ................................................................. 8-9

Recording to a miniSDTM Card ......................................... 10

Trouble Shooting ...............................................................11

Tips................................................................................... 12

Specifications .................................................................. 13

Programming .............................................................. 14-16

Programming Options ................................................ 17-20

Encryption ......................................................................... 21

Accessories Antennas..................................................... 22

Warranty ............................................................................ 23

The T-2350 is a synthesized VHF, digital and analog audio transmitter with a

software selectable power output of 1 Watt. The T-2350 has an optional

removable Mini SDTM Card that can record approximately 1 minute of audio in

WAV file format per MB of storage.

The T-2350 has 10 programmable channels. It is designed for body worn

personal protection and evidence gathering missions. Its miniature size and

rugged design insures safe concealment and long lasting performance. The

time to half power with fresh AAA Alkaline batteries is 5 hours. The transmission

is programmable for digital P25 clear, digital P25 encrypted, analog

narrowband, or analog wideband operation. The T-2350 transmission is either

duplexed on the mic/antenna cable (meaning the microphone is the antenna)

or transmitted on a stand-alone noodle antenna, in which case the internal

microphone or remote microphone must be used.

Concerned with the rapid evolution of digital communication technologies and

a need for interoperability, the Association of Public Communications safety

Officials (APCO) developed an open architecture, digital standard for public

safety and government communications systems. Products compliant with

APCO Project 25 standard are interoperable, regardless of the manufacturer.

The National Telecommunications and Information Administration (NTIA) has

adopted the APCO Project 25 interoperability standard, also known as TIA/EIA-

102. The T-2350 is compliant with this standard.

Overview

Front of Transmitter

Channel Select

Switch

Internal

Batteries

Back of Transmitter

miniSDTM Card

Connections

ANTENNA (Female Lemo Connector)

This connector accepts both the mic/antenna and the noodle antenna.

MULTI-PIN CONNECTOR (Male multi-pin connector)

This connector mates with an external microphone and is used in conjunction

with the noodle antenna. This connector also mates with the programming

cable.

STATUS LED

Once power is applied (after approximately 3 seconds), the Status LED will turn

on (green), which indicates a successful self-test. The LED will turn off after a

few seconds, and remain off or flash green at 1 second intervals. (See program-

ming section)

ON/OFF SWITCH (Slide Switch: Green dot is ON, Red dot is OFF)

The ON/OFF switch controls the power to the transmitter. The power is supplied

through the internal battery compartment, which holds six AAA batteries. Sliding

the switch to the green dot turns the power ON. Sliding the switch to the red dot

turns the power OFF.

CHANNEL SELECT SWITCH (Rotary Switch)

The channel select switch allows you to change transmit channels and is

located on the front of the transmitter. It is a rotary switch which requires the use

of the supplied screwdriver to turn the switching mechanism. Select a transmit

channel number by turning the rotary switch.

On / Off Switch

Multi Pin Connector

Top View

Internal Microphone

Status LED

Antenna Connector

NOTE: When Cycling power on the

unit, power switch must be left in

the off postion for at least 2

seconds before turning it back on.

NOTE: When using the noodle

antenna, the unit must be pro-

grammed to use the alternate

microphone. If no external

microphone is connected, the unit

will automatically use the internal

microphone.

QUICK START Option1 Using The Antenna/Mic AssemblyUsing The Antenna/Mic Assembly

Using The Antenna/Mic AssemblyUsing The Antenna/Mic Assembly

Using The Antenna/Mic Assembly

NOTE: The channel being used must be programmed

to use the antenna/mic

1Install the antenna/mic into the antenna connector

on the transmitter.

NOTE: This is a push-on, push off locking connector.

The connector will rotate 360° in the transmitter

without disconnecting. Use extreme caution when

connecting or removing the mic/antenna.(See

illustration on page 12.)

2Ensure that the power switch on the transmitter is set

to OFF. (Red dot is OFF).

3Slide the battery door to the right and install six, fresh

AAA batteries, being careful to observe proper polarity.

Slide the battery door to the left to close the battery

compartment.

4Using a small screwdriver, turn the recessed rotary

switch located on the front cover, to the desired

channel.

5Turn the unit on by sliding the switch to the ON

position. (Green dot is ON.)

NOTE: Once power is applied (after approximately 3

seconds), the Status LED will turn on (green), which

indicates a successful self-test. The LED will turn off

after a few seconds.

NOTE: Do not operate

the transmitter without

an antenna installed.

QUICK START Option 2

Using A Separate MicrUsing A Separate Micr

Using A Separate Microphone with theophone with the

ophone with theophone with the

ophone with the

Noodle AntennaNoodle Antenna

Noodle Antenna

NOTE: The channel being used must be programmed

to use the internal mic.

1Install the 36” remote microphone into the auxiliary

(multi-pin) connector on the transmitter

2Install the noodle antenna into the antenna connector

on the transmitter. Adjust length to center of operating

frequencies. (See example on Page 22)

NOTE: This is a push-on, push off locking connector.

The connector will rotate 360° in the transmitter without

disconnecting. Use extreme caution when connecting

or removing the noodle antenna.(See illustration on

page 12.)

3Ensure that the power switch on the transmitter is set

to OFF. (Red dot is OFF).

4Slide the battery door to the right and install six, fresh

AAA batteries, being careful to observe proper polarity.

Slide the battery door to the left to close the battery

compartment.

5Using a small screwdriver, turn the recessed rotary

switch located on the front cover to the desired

channel.

6Turn the unit on by sliding the switch to the ON

position.(Green dot is ON.)

NOTE: Do not operate

the transmitter without

an antenna installed.

miniSDTM

Card

miniSDTM Card

Adapter (to be

used with Card

Reader)

miniSDTM Card

miniSDTM

Card

miniSDTM Card

The T-2350 uses an industry-standard miniSD™ card to make audio

recordings. A 512 MB card, an SD to miniSD adapter, and an SD card reader

are provided with a new T-2350. The audio is recorded in a Windows PCM

waveform format (.wav file). Should the need to replace the card arise, they can

be purchased at most major retailers in various densities from 32 Mb to

512 Mb. Higher densities may be available in the future. As an example, a 32Mb

card will provide approximatley 30 minutes of recording time, 64Mb wil provide

about 60 minutes, etc. The 512 Mb card included with the transmitter will

provide well over 8 hours of recording time. Generally speaking, 1 MB of

memory will provide about 1 minute of recording.

Every new miniSD™ must be properly formatted before it can be used.

Formatting is a simple process that can be done on almost any Microsoft

Windows equipped PC, Laptop, Notebook, and some hand-held PCs. Typically,

this will only need to be done once on each card.

Installing miniSDTM Card

The miniSD™ card slot is accessed by sliding the side panel down (Figure 2).

The Card is inserted with the gold tabs facing the same side as the Channel

Switch. When installed, a red LED will be illuminated indicating that the card

should not be removed due to file management activity. Wait until the red LED

is OFF before removing the card by gently pushing in until it releases.

SD Card

Reader

NOTE: Never insert or remove the card while power is ON.

miniSDTM Card

miniSDTM

slot

Figure 2

Formatting Instructions for Desktop, Laptop, and Notebook computers.

1. Double click on ‘my computer’ to display your list of drives.

2. Insert the miniSD™ card into the miniSD™ to SD adaptor as shown.

3. Insert the adaptor into the SD card reader included with the

transmitter.

4. Insert the card reader into an available USB port on your computer.

The computer should acknowledge the installation by adding another

drive icon in the drive list called ‘Removable Disk’ and followed by a

drive letter.

5. Right click on this new drive, pick Properties, and then Format.

WARNING: Do not perform this function on any drive whose name or type is

“LOCAL DRIVE”. Doing so could permanently harm your computer.

6. Ensure that the ‘Quick Format’ and ‘Enable Compression’ boxes are

NOT checked, then click ‘Start’.

7. Click OK in the Warning box that appears. When the dialog box that

confirms that the format is complete appears, click OK. The format is

now complete and the miniSDTM card can be used in the T-2350.

Installing the miniSDTM card into the T-2350

1. Power OFF the T-2350.

2. Remove the aluminum cover plate access the miniSDTM slot.

3. Install the miniSDTM card so the gold fingers of the miniSDTM card will

face the same side as the Channel Select Rotary switch of the T-2350

transmitter.

4. Replace the aluminum cover plate

Side View of the miniSDTM slot

Recording to a miniSDTM Card

Each of the ten selected channels on the T-2350 can have the recording feature

turned on or off independently from each other. This is accomplished by

clicking the ‘recording on’ or ‘recording off’ button for each channel in the DTC

Universal Programming Software (refer to Figure 3 page 19 for details). To

make a recording, the desired channel must have the ‘recording on’ button

checked, and a properly formatted miniSD card with some available space

must be installed in the T-2350 miniSD slot. For the purposes of this tutorial,

the ‘recording messages’ radio button should be set to ON via the DTC

Universal Programmer.

1. Install a properly formatted miniSDTM card with some available space into

the T-2350, gold connectors facing the side with the channel switch, and

slide the door closed.

2. Set the channel switch to a channel with recording enabled.

3. Turn on a radio reciever tuned to a matching frequency.

4. Turn on the T-2350. First, a message broadcasting “Media Present With

More Than Four Hours Of Recording Time” will be heard on the receiver, then

a few seconds later you will hear the message “Recording Start”.

5. Speak into whichever microphone is enabled, allowing for the recording to

progress for a few moments

6. Set the power switch to the OFF position.

7. Ensure that the red LED in the card slot is NOT on, then push the card in to

remove.

8. Insert the card into the miniSD-SD adaptor, then insert the adaptor into the

reader.

9. Using Windows Explorer, open the SD card and double click on the newly

created .wav file. This should launch the application that plays audio files.

10. Ensure the PC speakers are turned on and at a comfortable listening level.

The recording you just made should now be playing.

NOTE: Pre-recorded messages are

broadcast but not recorded.

Recording

Trouble Shooting

Tips

SLIDE BLACK SLEEVE

PULL UP ON SECTION INDICATED

TO RELEASE LOCK AND REMOVE

NOTE: This is a push-on, push off

locking connector. The connector

will rotate 360° in the transmitter

without disconnecting. Use extreme

caution when connecting or

removing the mic/antenna or

noodle antenna. To remove slide

the black sleeve back, and pull up

on the metal base, then pull the

mic/antenna or noodle antenna

straight out.

Disconnecting the noodle

antenna or the mic/antenna

assembly.

Additional Operational Notes:

The T-2350 operates on six AAA batteries in series, which produce 9 VDC. A fresh

set of batteries will operate the unit for over five hours when in high power mode.

Battery reversal guards are integral to the battery compartment to eliminate the

possibility of cell reversal.

NOTE: Always turn the unit off and remove used batteries when not in use. It is

imperative to discard partially used batteries, as their remaining life is not

predictable. Always start an operation with a fresh set of batteries.

Audio Circuit and Body Mounting Tips:

All body worn transmitters are susceptible to “clothing noise”. Reducing this

rubbing effect is accomplished in a variety of ways. Attach the transmitter to the body

with a secure mounting method, such an ace bandage or a custom harness.

Then;

1Try to locate the microphone in an area that “pickup” will be best and rubbing

noise is least. Avoid the arms, legs, crotch or under the arms or the waist

area. Front torso mounting is ideal.

2Always provide a small amount of strain relief on the microphone cable itself.

This reduces the noise caused by the microphone cable and element being

tugged and prevents cable damage.

3Secure the microphone cable to the body with medical adhesive tape in at

least two spots, the final being about an inch below the element. Remember

to leave a strain relief loop!

4Completely cover the microphone element (facing outward) with an ordinary

Band Aid™. This provides a damped baffle for the microphone and a slick

surface for clothing to rub on, and actually does not impact audio pickup level

at all.

Specifications

Care should be taken when selecting the proper output

power for the T-2350. Higher power will give the greatest

range but will shorten the battery life and increase the

chance of counter detection. DTC recommends using the

lowest possible transmit power that can safely do the job.

The power level must be selected in software. Each

channel can be individually set to either high or low

power.

ITEM SPECIFICATION

Power (RF) 500mW

1000mW

Controls and Indicators • 10 position rotary channel/mode switch

• Sliding ON/OFF power switch

• Bi-color Status LED

Connectors Mic/antenna, combination external

mic/power/programming and

multi-pin connector

Frequency Stability Within +/- 2.5 ppm over -30° C to +65° C

Channel Capacity 10 User programmable with DTC Universal

Software

Frequency Range • 150 - 174 MHz (VHF-High)

• 138 - 150 MHz (Option VHF-Low)

Minimum Tuning Step N/A: Transmitter can be programmed to any channel

within specified frequency band.

Deviation 5 KHz (wide) or TIA/EIA-102 compliant

2.5 KHz (narrow) , programmed by channel

Microphone Electret-fet

Spurious and Harmonics -50 dBc max

Operating Temp Range -30° C to + 70° C

Power Sources Six AAA batteries

Battery Life 5 hours min with AAA batteries measured to half-life

of transmitter output power

Dimensions

Weight

2.275” W x 3.70” L x 0.525” D

Unit .188 lbs / Unit and Batteries .288 lbs

NTIA Compliant TIA/EIA-102 - Analog and Digital mode

NOTE All specifications at 25° C and RF measurements

taken into 50 Ohms unless otherwise stated.

Introduction

DTC has improved the flexibility in the programming options you have on the

T-2350 audio transmitter. You can choose to use some, all, or none of this

flexibility.

When you order a T-2350 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

channels.

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

enabling you to change any programmable option. 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 at the depot for most variations you

might encounter in the field.

The configuration of each channel is managed with DTC programming

software. The programming software included with your T-2350 allows you

to do all of the following:

Programming

-Assign frequencies to each channel

-Select the mode of operation for each channel

(digital clear, digital encrypted, analog narrow or

analog wideband)

- Select the 56-bit DES-OFB encryption key and

16-bit key ID

-Select power level for each channel (High or Low)

-Select which microphone to use

(mic/antenna or alternate microphone).

TIP: Make sure that you program

your transmitter to match the

frequencies of your receiver, and

test the components as a system

prior to going into the field!

- Select Automatic Gain Control mode

(High Gain AGC, Low Gain AGC, No AGC

(Digital Clear/Encryption Only)

- Select LED operation

(normal operation or disabled)

-Enable/disable recording for each channel

- Turn on/off pre-recorded miniSD™ status and

battery status messages

- Set internal clock

Programming

Installing DTC Universal Programming Software

on your PC

NOTE: Uninstall any previous versions by going to Add/Remove Pro-

grams, 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

Programming

Your new settings have been installed.

NOTE: Width refers to channel spacing. 12.5 kHz =

Narrowband. 25 kHz = Wideband

1Connect the antenna to the T-2350 transmitter.

2Install the programming cable into the connector on

the T-2350.

3Plug the serial cable of the programming cable into

the COM1 or COM2 port of your computer.

4From the Start Menu, Select Programs>DTC

Communications>COM1 or COM2 on your computer.

5The cycle power screen displays.

6Slide the power switch to the ON position and click OK.

A message screen displays T-2350 downloading.

7Click on the TX Channels Tab.

9Enter your new settings and click OK. (See Programming

Options pages 18-21) You can change the frequencies,

mode, key ID, misc source, AGC, and bandwidth

The programming software returns

to the TX channels screen with

your new settings displayed, and

an asterisk (*) beside the channel

that has changed.

10 Click on the upload button.

A message screen displays the new settings being

uploaded to device.

A message screen

displays that your

settings have been

successfully uploaded.

8Click on the channel you need to change and click on

the Edit Channel button

Programming Options

Click this button to establish

communication between unit and PC.

Follow the on-screen instructions.

Uploads new channel information

to the unit. Click this button when all

of the necessary configuration

changes are complete

Global transmit options.

See Page 20

Individual channel

information

See Page 18

Model Number

Firmware Version

Denotes band of

operation

Figure 1

Programming Options Click on the channel of

interest, then click this button

to edit individual channel

settings.

Refer to Page 19.

Figure 2

Repeats channel settings

from previously set channel

Programming Options

Figure 3

Sets encryption key to be

associated with this channel

Select RF Power

Selects Modulations

mode

Enter frequency

in MHz AD

A. Selects AGC mode. In analog transmission

modes, AGC Off is not available and will operate as

LOW when selected. In digital transmission mode

all three settings are available.

B. Selects microphone or auxiliary input. When

selecting Internal/ALT1, the internal microphone will

be automatically selected unless there is an external

source connected to ALT1 on the circular connector.

In both settings, an external source will automatically

be selected when connected. When selecting

Antenna Mic/ALT2, you must have either the Antenna

Mic (DTC PN 7011149) or an external input source

connected to ALT2 on the circular connector.

C. Selects RF power operation when unit is in a low battery

condition. When the internal microprocessor detects that the

battery voltage has dropped below 4.1 VDC, the transmit

power will be controlled according to these settings.

Selecting Low Power or Off will prolong battery life, and will

not affect recording settings.

D. Record mode. Disables or enables recording on individual

channels. The Switched setting is intended to be used with

the optional remote recording switch.

E. Turns audio messages On/Off

None - No recording status or warnings will be broadcast.

Power Up - The status of the card will be broadcast on

power up only, not during operation.

Active Only - Record status and warnings will be broad-

cast during operation, but NOT on power up.

All - Record status and warnings will be broadcast during

operation AND on power up.

Figure 4

Turns low battery

Warnings On/Off

Turns external

status

LED On/Off

Edits encryptions

codes and keys.

See Page 21

Programming Options

F. Updates clock

Selecting yes will update the T-2350 internal clock using

the time from your computer. The update will be made

when the Upload button is clicked.

Digital Encryption

In the “Digital Encrypt” mode of opera-

tion, this unit uses a 56-bit DES-OFB

Encryption Key per the APCO Project 25

specification. Each Encryption Key is

identified/labeled using a shorter Key

Identifier (16 bits), known as the KeyID.

If the unit uses the Digital Encrypt mode

of operation, one or more KeyID/key

pairs need to be entered.

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

(Table 1)

Encryption

Figure A

Hexa

decimal Binary

Encryption

1. To start entering KeyID/Key pairs, select the “Tx Options” tab , and click the Edit

button under “Encryption_Keys”.

2. To enter a new pair, click “Add Item”. In the dialog box (see Figure A), enter a

four-digit hexadecimal number for the KeyID and click “OK”.

3. The KeyID will be displayed at the top of the dialog box, and the program will

then ask to enter the Encryption Key (16 hexadecimal digits). When done

entering the Key, click OK, and the KeyID/Key pair will be entered into the avail-

able list. If the parity of any of the bytes is not odd, the user will be warned

“Wrong parity entered” and the KeyID/Key will have to be re-entered. To protect

the Key, it will not be shown or displayed once it is entered.

Associating a Key/KeyID pair with a

Channel

For each channel with the “Digital

Encrypt” mode selected, a Key/KeyID

pair must be selected. Under the “Tx

Channels” tab, select the channel and

click “Edit Chan”. The Key/KeyID pair

is selected under “key_IDs”. Note that

you only see the KeyID, not the Key

itself. Note that multiple channels

may use the same KeyID/Key pair if

desired. If the mode is not “Digital

Encrypt”, the key_ID setting is ignored

and has no effect.

Entering Key/KeyID pairs

The KeyID is essentially a label for the

DES-OFB Encryption Key. The KeyID is

a 16-bit value, represented by four

hexadecimal digits, with each hexadeci-

mal digit representing 4-bits (see Table

1 below). The Encryption Key is a 64-bit

value (56-bit key + 8 bits parity), repre-

sented by eight hexadecimal digits. Per

the APCO Project 25 specification, each

byte (i.e. pair of hexadecimal digits) in

the Encryption Key must have odd

parity. Odd parity means that the

number of “one’s” in the binary (0/1)

representation of the 8-bit byte must be

odd. For example, the following is a

valid Encryption Key: 2F AB 08 E3 B5

9D 4C 16 . 1

NOODLE ANTENNA

DTC part number

7011151 138 - 225 MHz

(adjustable)

The “noodle” antenna may be adjusted over the frequency range of 138 MHz to 225

MHz by adjusting the amount of wire that is folded back along side the end of the

antenna.

The total length may be calculated by the following formula.

Length (inches) = 2950 / (Freq MHz)

MICROPHONE/ANTENNA

DTC part number Frequency Range

7011149 150 - 174 MHz

7001073 140 - 150 MHz

7001077 210 - 225 MHz

Accessories Antennas

DTC Communications, Inc. (DTC) warrants its RF transmitting and receiving products to be free

from defects in workmanship or material for a period of two (2) years from the date of shipment

unless otherwise stated.

The liability of DTC, Inc. under this warranty is limited to replacing, repairing, or issuing credit, at

option, for any products, which are returned by the purchaser during such warranty period, provided:

DTC is notified and a Repair Authorization Number is issued by DTC Customer Service within 30

days after discovery of such defects by Customer.

The defective units are returned to DTC with transportation charged Prepaid by the Customer.

Product damaged in shipment must be reported to and claim forms filed with the Carrier by the

Customer. In shipments to the factory, notice and claim procedures will be initiated by DTC.

DTC’s examination of such products shall disclose to its satisfaction that such defects exist and

have not been caused by misuse, misapplication, neglect, improper installation, improper storage,

alteration, physical damage or accidents.

The warranty shall not apply to microphones, batteries, antennas, crystals or material ordinarily

susceptible to field damage or any accessories of a disposable nature. The warranty shall not apply

to Engineering Prototypes or Customer requested modifications to electronic circuits.

This warranty does not apply to and DTC does not independently warrant items or systems sold by

DTC which are produced by other manufacturers. With respect to such items, the Customer shall

look to the warranty of the original manufacturer and DTC disclaims all warranty, expressed or

implied.

Nothing in this warranty, or any statement, brochure, bulletin, or advertisement is to be interpreted as

establishing the suitability of any product for particular application or use. Applications of the product

and the determination of suitability for any application, is the sole responsibility of the Customer.

TWO YEAR WARRANTY

486 Amherst Street • Nashua, New Hampshire 03063 • 603-880-4411

DTC Communications T2350 T-2350 1Watt Audio Transmitter User Manual T2300manual 2

DTC Communications Inc. T-2350 1Watt Audio Transmitter T2300manual 2

Users Manual

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