Digital Derringer™ Project 25 Micro Digital & Analog Transmitter/Recorder T-2500-M
how to contact DTC copyright notice trademarks 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. Copyright © 2007 Trademarks of DTC Communications, Inc. include: 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.
manual conventions 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. NOTE: Describes special issues you should be aware of while using a particular function. TIP: Describes application hints. TABLE OF CONTENTS Overview ..............................................................................4-5 Quick Start ..............................................................................
OVERVIEW Alignment Mark for Large Pin of 5-pin Locking Connector This manual describes the operation of the Digital Derringer™ T-2500-M. This transmitter operates in the following modes: • Analog Narrow Clear • Analog Narrow Scrambled • Analog Wide Clear • Analog Wide Scrambled • Digital Clear • Digital Encrypted Status LED The T-2500-M is a synthesized VHF, digital and analog audio transmitter with a power output of up to 500 mW.
OVERVIEW ANTENNA (Female MMCX Connector) This RF connector accepts the noodle antenna. 5-PIN LOCKING CONNECTOR This connector supports the external 36” microphone, DC power input, and external ON/OFF. USB CONNECTOR This connector mates with the programming cable during programming. STATUS LED The unit has a Bi-Color (green/red) LED that is used to give status indication.
QUICK START Using A Separate Microphone with the Noodle Antenna Programming Cable NOTE: Do not operate the transmitter without an antenna installed. Line up longest pin with dot. 8 6 STATUS 0 NOTE: The channel being used must be programmed to use the internal or 36” external mic by selecting Audio Input in Edit Channel Settings (see page 22).
QUICK START The Status LED is used to give status indication. The LED function is controlled by a global setting to be one of three modes: OFF: Unit gives power ON and OFF status but no other indications, COVERT: Unit indicates state change for approximately 5 seconds every time the state changes, ON: Unit constantly indicates the status using the LED.
RECORDING Recording You can set the recording feature ON or OFF for each of the ten T-2500-M channels. This is accomplished by clicking the Recording On or Recording Off button for each channel in the DTC Universal Programming Software (see page 22). To make a recording, the desired channel must have the Recording On button checked, For the purposes of this tutorial, the Recording Messages radio button should be set to ON via the DTC Universal Programmer. 1. 2. 3. 4.
AUDIO MESSAGES The following messages are transmitted at power-ON or when the channel selector is changed during operation: Voice Message Description More than 4 hours recording time remaining. More than 4 hours recording time remaining. More than 3 hours recording time remaining. More than 3 hours (but less than 4 hours) recording time remaining. More than 2 hours recording time remaining. More than 2 hours (but less than 3 hours) recording time remaining.
OPERATING TIPS Audio Circuit and Body Mounting Tips: All body worn transmitters are susceptible to clothing noise. Reducing this noise is accomplished in a variety of ways. Attach the transmitter to the body with a secure mounting method, such as an ace bandage or a custom harness to reduce rubbing. Then follow these steps: 1 Locate the microphone in the desired location. 2 Always provide a small amount of strain relief on the microphone cable itself.
OPERATING TIPS Additional Operational Notes: The T-2500-M operates on two or three CR2 batteries in series (6 or 9 VDC). A fresh set of batteries will operate the unit (transmit mode) for more than 2.5 hours. The four AA battery pack will provide 10 hours of operation time at low power. An optional four AAA battery pack is also available from DTC, which will provide five hours of operation time.
SPECIFICATIONS Care should be taken when selecting the proper output power for the T-2500-M. Higher power will give the greatest range but will increase the chance of counter detection. DTC recommends using the lowest possible transmit power that can safely do the job.
PROGRAMMING Introduction DTC has built a great deal of flexibility into the programming options you have on the T-2500-M. DTC factory programs your frequencies at time of order at no additional charge to you. Software and programming cable are included with the kit, enabling you to change your frequencies and other associated features. This is ideal if you work with other agencies, or anticipate the equipment being used by a multi-jurisdictional task force.
PROGRAMMING Installing DTC Universal Programming Software on your PC NOTE: Uninstall any previous versions by going to Add/Remove Programs, clicking on Universal Programmer, and clicking on uninstall. Place the DTC Universal Programming Software CD into your CD drive and complete the following steps: 1 Click on Start, click on Run... 2 Click on the Browse button. 3 In the Browse window, select your CD drive. DTC Software Installation Wizard 4 Double-click install.exe. 5 Click OK in the Run... dialog box.
PROGRAMMING 1. Ensure that your transmitting antenna is connected to the TX. 2. Use fresh batteries or connect a suitable DC power source. 3. Install one end of the USB programming cable to the USB connector on the TX. 4. Connect the other end of the USB programming cable to an available USB port on your computer. 2 1 USB Port 3 Battery Pack 5. Launch the Universal Programmer application. The Connect Device Dialog box displays. It will automatically close when the new device is recognized. 6.
PROGRAMMING OPEN and SAVE By selecting FILE > SAVE, it is possible to save a particular suite of channel settings to a file for future recall. Similarly, FILE > OPEN can be used to recall a suite of saved channel settings that can then be programmed into the TX. User Comments are NOT saved when the channel setting information is saved to a file. User Comments are NOT overwritten if the TX is programmed from a file that was recalled.
7. In the TX Channels tab, select the channel that you want to modify. In the example (page 16), Channel 1 is selected. Press the Edit Chan button. The Edit Channel Settings dialog box displays. A B C D E F G H 8. Enter the following configuration parameters for your device: A Enter frequency in MHz. See note (right). B Transmit mode. Select Analog Wide, Analog Narrow, Digital Clear, or Digital Encrypted. C Selects microphone operation. Internal Mic: the internal microphone is used.
PROGRAMMING 9 Select the TX Options tab. The TX Options tab displays. See dialog boxes on page 23. 11. From the TX Options tab, select the following configuration parameters: • LED Mode Select Normal to enable full LED operation. Select OFF to disable LED operation. Select Covert to enable LED operation for only a few seconds when performing settings changes. • Device Clock Pressing Update sets the TX internal clock to the PC clock time. • Encryption Keys Click Edit to display the Edit List dialog box.
PROGRAMMING From the TX Options, encryption_Keys parameter, click Edit. The Edit List dialog box displays. Edit List Dialog Box Select the Type-ID in the Edit List dialog box. Click the Add Item button. The Edit Encryption Item dialog box (bottom) displays. In this example, we have added the item AES-0000. In the next example, we have edited the item DES-0000.) NOTE: Enter any changes to this dialog box carefully. Double-check and write down the information before clicking the OK button.
PROGRAMMING For DES-OFB encryption, the Edit Encryption dialog box displays as shown here (left). NOTE: Enter any changes to this dialog box carefully. Doublecheck and write down the information before clicking the OK button. Edit Encryption Item Dialog Box Add DES Item 20 DTC COMMUNICATIONS, INC.
PROGRAMMING Hexadecimal Binary 0 0000 1 0001 2 0010 3 0011 4 0100 5 0101 6 0110 7 0111 8 1000 9 1001 A 1010 B 1011 C 1100 D 1101 E 1110 F 1111 Use Table 1. (left) to convert to hexadecimal numbers. Table 1 DTC COMMUNICATIONS, INC.
WAVE CHECKER Digital Watermark The digital watermark is a specially encoded header, which is added to the (.wav) file. The audio data itself is not changed, and it in no way affects the audio playback. Wave Checker is a handy utility that can be used to authenticate the audio wave (.wav) files created with the TX by examining the watermark. The application installation is described on page 14. To use the Wave Checker utility, complete the following steps: 1. Double-click the Wave Checker.exe file.
WAVE CHECKER 3. Navigate to the (.wav) file that you want to authenticate and select the file. Click the Open button (Fig. 2.). One of three results will display: Unmodified (Fig. 3.), Unmodified but date/time not correct (Fig. 4.), or Audio data modified (Fig. 5.). Fig. 3. Result: Unmodified wave file. Fig. 4. Result: Unmodified wave file but time/date not correct. The result shown in Figure 3 indicates that the file is trustworthy. Fig. 5. Result: Wave file audio has been modified.
NOTES 24 DTC COMMUNICATIONS, INC.
NOTES DTC COMMUNICATIONS, INC.
TWO YEAR WARRANTY 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.
CONTACT US Contact Information Nashua Main Office Numbers 486 Amherst Street Nashua, New Hampshire 03063 USA (T) 603 880- 4411 (F) 603 880-6965 Toll Free in the USA 1- 800 233- 8639 Inside Sales Technical Customer Support 603-880-4411 1-800-233-8639 Systems Integration 603 546-2110 Law Enforcement 603 546-2217 Military 434 295-3330 A complete listing of Contact Individuals can be located on our website at: www.dtccom.
486 Amherst Street • Nashua, New Hampshire 03063 • 603-880- 4411 www.dtccom.
