DTC Communications DSS950TX User Manual Operators Manual

DTC Communications Inc. Operators Manual

Operators Manual

DOCUMENT NUMBER: OP1920052 REV. BDESCRIPTION: DSS-950-TX500mW Digital Spread SpectrumAudio Surveillance TransmitterUSER’S MANUAL ECO NUMBER: 2130 Page 0 of 4 Date: 11/23/1999 Orig:_____________ SIGN OFF DATE: mm/dd/yyProj Eng._________________Mfg Mgr. _________________Documentation ____________Eng. Mgr._________________Purchasing _______________
OP1920052 REV B DTC COMMUNICATIONS INC 11/23/1999 1 of 4DSS-950-TX500 mW Digital Spread SpectrumAudio Surveillance TransmitterUser’s ManualNovember 1999Document OP1920052DTC COMMUNICATIONS, Inc.75 Northeastern Blvd.Nashua, NH 03062
OP1920052 REV B DTC COMMUNICATIONS INC 11/23/1999 2 of 4DescriptionThe DSS-950TX is a 900 MHz, low power, spread spectrum audio surveillance transmitter usedfor law enforcement applications. The transmitter employs digital modulation with direct sequencespread spectrum on one of three factory-selected channels in the 902-928 MHz range.The DSS-950TX has a power output of 500mW to an integral patch antenna built into thehousing, which meets the technical and safety requirements of FCC Part 15.203. This device iscompatible with the DTC Communications DSS-900-KT Audio Surveillance System. Range willbe approximately 2 to 3 times that of a 50 mW unit.Two microphone modes are supported, internal and external. The microphone audio is processedby an amplifier equipped with an automatic gain control (AGC) which may be turned ON or OFFwith an external switch. Microphone audio is secure; processed digitally with a continuouslyvariable slope delta-modulation (CVSD) speech coder at a rate of 32 kbps.The DSS-950TX is a portable device; DC powered by three AA batteries, which supply a nominal4.5 VDC. A step-up switcher is employed, which maintains the full half-Watt of output power overthe entire life of the batteries. Alkaline batteries will provide more than two hours of operating lifeand Lithium-Ion AA’s will provide more than four hours.The DSS-950-M is a flying lead module based on the same device, but is made roughly half thesize. This module operates from an external 10 – 32 VDC via stripped and tinned leads and isdesigned for use with larger battery packs and vehicular power. The antenna is also integral tothis unit.Using the TransmitterKeep in mind that the TX patch antenna must be facing away from the agent’s body to workproperly. The patch antenna is housed under a black plastic-like cover at the top of the unit.There is no external antenna on this unit. This is a high current drain device (500 mA); alwaysreplace the batteries before using the unit.• He internal top-fire mike is located between the two slide switches. It is active unless anexternal mike is plugged into the locking subminiature connector. Two microphones aresupplied with the DSS-9500; they differ only in cable length and color. External microphonesmay be extended up to 100 feet from the transmitter. PowerOff On AGCOff On InternalMicrophone ExternalMicrophoneANTENNA SIDE (AWAY FROM BODY)Figure 1 TX Control Panel
OP1920052 REV B DTC COMMUNICATIONS INC 11/23/1999 3 of 4Using the Transmitter (Cont.)CAUTION:ALWAYS MAKE SURE THAT THE PLASTIC ANTENNA COVER IS FACING OUTWARDS;AWAY FROM THE TORSO, IN ORDER TO MAXIMIZE RANGE AND MINIMIZE RADIOFREQUENCY ABSORBPTION INTO THE BODY. THIS DEVICE HAS BEEN TESTED ANDHAS BEEN FOUND TO BE WITHIN SAFE LEVELS FOR LOCALIZED SPECIFICABSORPTION FOR UNCONTROLLED ENVIRONMENT/GENERAL POPULATIONEXPOSURE WHEN USED PROPERLY.1. Start the surveillance session with fresh AA batteries. Duracell™ MN1500 or Energizer™ E91LR6 AM3 or Ultra™ batteries are all good choices for Alkalines. The Energizer L91 Lithiumwill provide better than double the life of the best Alkalines. Slide the battery door open toinsert the batteries. (Figure 2).2. The TX unit is labeled with its frequency.3. Set the CHANNEL SELECT on the RECEIVER to 1 for 905.5 MHz, 2 for 915 MHz and 3 for924.5 MHz. Always check that the receiver is set on your frequency. At this power level, thetransmitter may bleed into an adjacent channel and cause a false indication when thetransmitter is very close to the receiver.4. Turn the TX ON (Green Dot) using the slide switch at the top of the unit.5. Set the AGC switch to ON (Yellow Dot). This provides the optimum audio at the RX. Turn theAGC OFF (Black) if a loud, interfering noise, such as a jukebox, is near the microphone.6. Mount the transmitter as high on the torso as possible, to maximize range and performance,especially when the agent may enter a vehicle.SLIDE COVER+++Figure 2 Battery Door
OP1920052 REV B DTC COMMUNICATIONS INC 11/23/1999 4 of 4SpecificationsInput: FET-Electret Mic. (internal and external with 24“ cable-auto. switching)Controls: Power ON/OFF, AGC ON/OFFAntenna: Linear PatchPower Output: 500 mWAudio Coder Rate: 32 kbpsAGC Range 45 dBModulation: Direct Sequence Spread SpectrumChip Rate: 704 kilochips per secondProcessing gain: Greater than 10 dBSpreading Code Proprietary 37-chip code (Factory fixed)Spurious Radiation Greater than -45 dBc:Frequencies: A = 905.5 MHz; B = 915.0 MHz; C = 924.5 MHz(3 Channel capability; single channel factory selected)Battery: 4.5 VDC with 3 AA batteriesBattery Life: 2 Hours Minimum Alkaline, 4 Hours minimum LithiumDimensions: 2.5” X 4.45” X 0.67”Weight: 10 oz including external microphone and batteries 0.67ANTENNA SIGNAL RADIATIONBAT DOOR4.452.5BODY SIDECopyright © 1999 DTC Communications Inc.

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