Users Manual

FCC ID: H25T2350

Users Manual

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FCCID_525997

T-2350-1Watt Audio Transmitter Project 25 Digital & Analog Project Users Manual DTC COMMUNICATIONS INCORPORATED Draft

How to contact DTC Copyright Notice Warranty For operator and troubleshooting Copyright © 2004 DTC warrants its manufactured components against information, customers are encouraged to refer to DTC Communications, Inc. All rights defects in material and workmanship for a period of the details in this manual. For additional reserved. No part of this document may be two (2) years, commencing on the date of original clarification or instruction, or to order parts, reproduced, transmitted, transcribed, stored in a re- purchase. contact DTC. trieval system or translated into any Products manufactured by others that are approved Customer Service is available Monday through language or computer language, in any form or by for use with DTC equipment are warranted for the Friday between the hours of 9:00 AM and 5:00 PM any means, including but not limited to electronic, manufacturer’s warranty period, commencing from EST at: Tel: 603-880-4411 magnetic, mechanical, optical, chemical, manual or the date of shipment from DTC. Fax: 603-880-6965 otherwise, without the prior written permission of Website: www.dtccom.com DTC Communications, Inc. Intellectual Property Rights Email: info@dtccom.com Notice Disclaimer The information in the document is subject to change Digital Voice Systems, Inc. (DVSI) claims 486 Amherst Street without notice. DTC makes no representations or certain rights, including patent rights under Nashua, New Hampshire 03063 warranties with respect to the contents hereof, and US Patents #5,870,405, #5,826,222, USA specifically disclaims any implied warranties of mer- #5,754,974, #5,701,390, #5,715,365, chantability or fitness for a particular purpose. DTC #5,649,050, #5,630,011, #5,581,656, reserves the right to revise this publication and to #5,517,511, #5,491,772, #5,247,579, make changes from time to time in the content hereof #5,226,084, #5,195,166, and under other US without obligation of DTC to notify any person of such and foreign patents patents and patents revision or changes. pending, in IMBE Vocoder technology and Trademarks software embedded in this product. Any use of this technology or software requires Trademarks of DTC Communications, Inc. include: a separate written license grant • DTC • MiniPIX® from DVSI. • DynaPIX® Other product names used in this manual are the IMBE is a registered trademark of Digital properties of their respective owners. Voice Systems, Inc. 2

Table of Contents Manual Conventions Overview ............................................................................. 4 Connections ...................................................................... 5 NOTE Describes special issues you should be aware Quick Start Option 1 .......................................................... 6 of while using a particular function. Quick Start Option 2 .......................................................... 7 WARNING Calls out situations in which equipment miniSDTM Card ................................................................. 8-9 could be damaged or a process could be incorrectly Recording to a miniSDTM Card ......................................... 10 implemented, but in which operator safety is not a factor. Trouble Shooting ............................................................... 11 Tips ................................................................................... 12 TIP Describes application hints. Specifications .................................................................. 13 Programming .............................................................. 14-16 Programming Options ................................................ 17-20 Encryption ......................................................................... 21 Accessories Antennas ..................................................... 22 Warranty ............................................................................ 23 3

Overview 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 Channel Select WAV file format per MB of storage. Switch The T-2350 has 10 programmable channels. It is designed for body worn personal protection and evidence gathering missions. Its miniature size and Internal rugged design insures safe concealment and long lasting performance. The Batteries 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) Front of Transmitter 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 TM a need for interoperability, the Association of Public Communications safety miniSD Card 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. Back of Transmitter 4

ANTENNA (Female Lemo Connector) This connector accepts both the mic/antenna and the noodle antenna. Connections Top View MULTI-PIN CONNECTOR (Male multi-pin connector) This connector mates with an external microphone and is used in conjunction Multi Pin Connector Antenna Connector 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 Status LED On / Off Switch few seconds, and remain off or flash green at 1 second intervals. (See program- Internal Microphone 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 NOTE: When using the noodle the switch to the green dot turns the power ON. Sliding the switch to the red dot antenna, the unit must be pro- turns the power OFF. grammed to use the alternate microphone. If no external CHANNEL SELECT SWITCH (Rotary Switch) microphone is connected, the unit The channel select switch allows you to change transmit channels and is will automatically use the internal located on the front of the transmitter. It is a rotary switch which requires the use microphone. of the supplied screwdriver to turn the switching mechanism. Select a transmit channel number by turning the rotary switch. 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. 5

QUICK START Option1 Using The Antenna/Mic Assembly NOTE: The channel being used must be programmed NOTE: Do not operate to use the antenna/mic the transmitter without an antenna installed. 1 Install 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.) 2 Ensure that the power switch on the transmitter is set to OFF. (Red dot is OFF). 3 Slide 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. 4 Using a small screwdriver, turn the recessed rotary switch located on the front cover, to the desired channel. 5 Turn 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. 6

Using A Separate Microphone with the Microphone QUICK START Option 2 Noodle Antenna NOTE: Do not operate NOTE: The channel being used must be programmed the transmitter without to use the internal mic. an antenna installed. 1 Install the 36” remote microphone into the auxiliary (multi-pin) connector on the transmitter 2 Install 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.) 3 Ensure that the power switch on the transmitter is set to OFF. (Red dot is OFF). 4 Slide 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. 5 Using a small screwdriver, turn the recessed rotary switch located on the front cover to the desired channel. 6 Turn the unit on by sliding the switch to the ON position.(Green dot is ON.) 7

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 miniSDTM be purchased at most major retailers in various densities from 32 Mb to Card 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 miniSDTM Card TM miniSD The miniSD™ card slot is accessed by sliding the side panel down (Figure 2). Adapter (to be Card The Card is inserted with the gold tabs facing the same side as the Channel used with Card Switch. When installed, a red LED will be illuminated indicating that the card Reader) 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. NOTE: Never insert or remove the card while power is ON. SD Card Reader 8

miniSDTM Card 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. Side View of the miniSDTM slot 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. miniSDTM slot 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 Figure 2 face the same side as the Channel Select Rotary switch of the T-2350 transmitter. 4. Replace the aluminum cover plate 9

Recording to a miniSDTM Card Recording 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. NOTE: Pre-recorded messages are broadcast but not recorded. 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. 10

Trouble Shooting 11

Tips Disconnecting the noodle Additional Operational Notes: antenna or the mic/antenna 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. assembly. Battery reversal guards are integral to the battery compartment to eliminate the possibility of cell reversal. SLIDE BLACK SLEEVE UP 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. PULL UP ON SECTION INDICATED TO RELEASE LOCK AND REMOVE 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; NOTE: This is a push-on, push off 1 Try to locate the microphone in an area that “pickup” will be best and rubbing locking connector. The connector noise is least. Avoid the arms, legs, crotch or under the arms or the waist will rotate 360° in the transmitter area. Front torso mounting is ideal. without disconnecting. Use extreme 2 Always provide a small amount of strain relief on the microphone cable itself. caution when connecting or This reduces the noise caused by the microphone cable and element being removing the mic/antenna or tugged and prevents cable damage. noodle antenna. To remove slide 3 Secure the microphone cable to the body with medical adhesive tape in at the black sleeve back, and pull up least two spots, the final being about an inch below the element. Remember on the metal base, then pull the to leave a strain relief loop! mic/antenna or noodle antenna 4 Completely cover the microphone element (facing outward) with an ordinary straight out. 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. 12

Specifications ITEM SPECIFICATION Care should be taken when selecting the proper output 500mW Power (RF) power for the T-2350. Higher power will give the greatest 1000mW range but will shorten the battery life and increase the • 10 position rotary channel/mode switch chance of counter detection. DTC recommends using the Controls and Indicators • Sliding ON/OFF power switch • Bi-color Status LED lowest possible transmit power that can safely do the job. Mic/antenna, combination external Connectors mic/power/programming and multi-pin connector The power level must be selected in software. Each Frequency Stability Within +/- 2.5 ppm over -30° C to +65° C channel can be individually set to either high or low 10 User programmable with DTC Universal Channel Capacity power. Software • 150 - 174 MHz (VHF-High) Frequency Range • 138 - 150 MHz (Option VHF-Low) N/A: Transmitter can be programmed to any channel Minimum Tuning Step within specified frequency band. 5 KHz (wide) or TIA/EIA-102 compliant Deviation 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 2.275” W x 3.70” L x 0.525” D Weight Unit .188 lbs / Unit and Batteries .288 lbs NTIA Compliant TIA/EIA-102 - Analog and Digital mode All specifications at 25° C and RF measurements NOTE taken into 50 Ohms unless otherwise stated. 13

Programming 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. TIP: Make sure that you program In general, this allows you to program at the depot for most variations you your transmitter to match the might encounter in the field. frequencies of your receiver, and test the components as a system The configuration of each channel is managed with DTC programming prior to going into the field! software. The programming software included with your T-2350 allows you to do all of the following: - Assign frequencies to each channel - Select Automatic Gain Control mode - Select the mode of operation for each channel (High Gain AGC, Low Gain AGC, No AGC (digital clear, digital encrypted, analog narrow or (Digital Clear/Encryption Only) analog wideband) - Select LED operation - Select the 56-bit DES-OFB encryption key and (normal operation or disabled) 16-bit key ID - Enable/disable recording for each channel - Select power level for each channel (High or Low) - Turn on/off pre-recorded miniSD™ status and - Select which microphone to use battery status messages (mic/antenna or alternate microphone). - Set internal clock 14

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. 1 Click on Start, click on run. 2 Click on the Browse button. 3 Click on or find your CD drive 4 Install the JAVA Runtime Environment Application first (CD provided). 5 Follow the install wizard screens. 6 Install the Universal Programming software next (floppy provided). 7 Click on Start, click on run. 8 Click on the Browse Button. 9 Click on your floppy drive. 10 Double click on the setup. 11 Follow the install wizard screens. Your programming software is installed 15

Programming 1 Connect the antenna to the T-2350 transmitter. 2 Install the programming cable into the connector on 3 the T-2350. 3 Plug the serial cable of the programming cable into 1 2 the COM1 or COM2 port of your computer. 4 From the Start Menu, Select Programs>DTC Communications>COM1 or COM2 on your computer. 6 9 Enter your new settings and click OK. (See Programming 5 The cycle power screen displays. Options pages 18-21) You can change the frequencies, 6 Slide the power switch to the ON position and click OK. mode, key ID, misc source, AGC, and bandwidth A message screen displays T-2350 downloading. The programming software returns to the TX channels screen with your new settings displayed, and an asterisk (*) beside the channel that has changed. 7 Click on the TX Channels Tab. 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 8 Click on the channel you need to change and click on successfully uploaded. the Edit Channel button Your new settings have been installed. NOTE: Width refers to channel spacing. 12.5 kHz = 16 Narrowband. 25 kHz = Wideband

Programming Options Uploads new channel information Click this button to establish to the unit. Click this button when all communication between unit and PC. of the necessary configuration changes are complete Follow the on-screen instructions. Individual channel information See Page 18 Global transmit options. Model Number See Page 20 Firmware Version Denotes band of operation Figure 1 17

Programming Options Click on the channel of interest, then click this button to edit individual channel settings. Repeats channel settings Refer to Page 19. from previously set channel Figure 2 18

Programming Options Enter frequency C D in MHz A B Select RF Power Sets encryption key to be Selects Modulations associated with this channel mode Figure 3 A. Selects AGC mode. In analog transmission C. Selects RF power operation when unit is in a low battery modes, AGC Off is not available and will operate as condition. When the internal microprocessor detects that the LOW when selected. In digital transmission mode battery voltage has dropped below 4.1 VDC, the transmit all three settings are available. power will be controlled according to these settings. Selecting Low Power or Off will prolong battery life, and will B. Selects microphone or auxiliary input. When not affect recording settings. selecting Internal/ALT1, the internal microphone will be automatically selected unless there is an external D. Record mode. Disables or enables recording on individual channels. The Switched setting is intended to be used with source connected to ALT1 on the circular connector. the optional remote recording switch. 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 19 connected to ALT2 on the circular connector.

Programming Options Turns low battery Warnings On/Off F E Turns external status LED On/Off Edits encryptions codes and keys. See Page 21 Figure 4 E. Turns audio messages On/Off F. Updates clock None - No recording status or warnings will be broadcast. Selecting yes will update the T-2350 internal clock using Power Up - The status of the card will be broadcast on the time from your computer. The update will be made power up only, not during operation. when the Upload button is clicked. 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. 20

Encryption 1. To start entering KeyID/Key pairs, select the “Tx Options” tab , and click the Edit Encryption 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 Figure A 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. Digital Encryption the Encryption Key must have odd In the “Digital Encrypt” mode of opera- parity. Odd parity means that the tion, this unit uses a 56-bit DES-OFB number of “one’s” in the binary (0/1) Encryption Key per the APCO Project 25 representation of the 8-bit byte must be specification. Each Encryption Key is odd. For example, the following is a identified/labeled using a shorter Key valid Encryption Key: 2F AB 08 E3 B5 Hexa Identifier (16 bits), known as the KeyID. decimal Binary 9D 4C 16 . If the unit uses the Digital Encrypt mode 1 0000 of operation, one or more KeyID/key Associating a Key/KeyID pair with a 2 0001 Channel 3 0010 pairs need to be entered. 4 0011 For each channel with the “Digital 0100 Entering Key/KeyID pairs 5 Encrypt” mode selected, a Key/KeyID 0101 6 The KeyID is essentially a label for the pair must be selected. Under the “Tx 7 0110 DES-OFB Encryption Key. The KeyID is 0111 Channels” tab, select the channel and 8 1000 a 16-bit value, represented by four click “Edit Chan”. The Key/KeyID pair 9 1001 hexadecimal digits, with each hexadeci- is selected under “key_IDs”. Note that A 1010 B 1011 mal digit representing 4-bits (see Table you only see the KeyID, not the Key C 1100 1 below). The Encryption Key is a 64-bit itself. Note that multiple channels D 1101 value (56-bit key + 8 bits parity), repre- may use the same KeyID/Key pair if E 1110 sented by eight hexadecimal digits. Per desired. If the mode is not “Digital F 1111 the APCO Project 25 specification, each Encrypt”, the key_ID setting is ignored (Table 1) 21 byte (i.e. pair of hexadecimal digits) in and has no effect.

Accessories Antennas 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) NOODLE ANTENNA DTC part number 7011151 138 - 225 MHz (adjustable) MICROPHONE/ANTENNA DTC part number Frequency Range 7011149 150 - 174 MHz 7001073 140 - 150 MHz 7001077 210 - 225 MHz 22

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. 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. 23

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Document Created: 2005-01-11 12:13:17
Document Modified: 2005-01-11 12:13:17
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