AT APPENDIX G: USER’S MANUAL
AT MODEL 1225 TRANSCEIVER TECHNICAL MANUAL produced by: APPLIED TECHNOLOGY SOLUTIONS, INC. 4200-F Technology Court Chantilly, VA 20151 This manual contains information proprietary to Applied Technology Solutions, Inc. and may not be re-produced without expressed permission.
AT MODEL 1225 TRANSCEIVER TECHNICAL MANUAL produced by: APPLIED TECHNOLOGY SOLUTIONS, INC. 4200-F Technology Court Chantilly, VA 20151 Document: FCC1225manual.
APPLIED TECHNOLOGY SOLUTIONS, INC. TABLE OF CONTENTS SECTION PAGE TITLE ONE INTRODUCTION ...................................................................................................................... 1 1.0 GENERAL ................................................................................................................................. 1 1.1 SPECIFICATIONS..................................................................................................................... 1 1.
APPLIED TECHNOLOGY SOLUTIONS, INC. SECTION ONE INTRODUCTION 1.0 GENERAL This document is the Operating Manual for the Model 1225 Hand Held Transceiver produced by Applied Technology Solutions, Inc. The Model 1225 is one component of the Voice Privacy Low Probability of Detection (VPLPD) System 1200. Other System 1200 components include the Model 1245 Monitor System and the Series 1250 Transmitters.
APPLIED TECHNOLOGY SOLUTIONS, INC. RF CHARACTERISTICS RF Channels: 2, Crystal Controlled Normal Mode: Transmit/Receive Channel A or B Repeater Mode: Transmit Channel A, Receive on Channel B Transmit 900 mW Power Output: Emissions Spurious: Out Of Band: Freq.
APPLIED TECHNOLOGY SOLUTIONS, INC. 1.2 CONTROLS, INDICATORS, USER I/O This section describes the user interfaces and indicators provided by the Model 1225 Hand Held Transceiver. USER CONTROLS VOLUME Dual function rotary switch. It is the power on/off switch plus volume control CHAN The channels are A, B and R where R refers to repeater operation. CODE A two position switch allowing selection of either the common (C) or private (P) code.
APPLIED TECHNOLOGY SOLUTIONS, INC. SECTION TWO OPERATION 2.0 GENERAL The ATS Model 1225 Hand Held Transceiver is one of the System 1200 devices. The System 1200 devices were designed to provide secure communications to law enforcement agencies. This section describes the operation of the Model 1225 with the other units in the System 1200 family. 2.1 ATS 1200 SYSTEM COMPONENTS The ATS System 1200 components include the Model 1245 monitor Station and the Series 1250 Transmitters. 2.
APPLIED TECHNOLOGY SOLUTIONS, INC. NOTE For non-repeater applications, all system transceivers MUST be set to the same channel and code. Cross channel or cross code operation is not possible. During idle periods, the Model 1225 will power down most of the receive circuits. The Model 1225 Hand Held unit only transmits when the PTT switch is depressed. The integral, side panel mounted PTT is a momentary switch and must be held down for the duration of the transmit interval.
APPLIED TECHNOLOGY SOLUTIONS, INC. THEORY OF OPERATION 3.0 GENERAL The Model 1225 Hand Held Transceiver is a push-to-talk, spread spectrum transceiver. It uses digitized audio. The digital data stream is scrambled before modulation for security. The combination of spread spectrum modulation and scrambled, digitized audio give the Model 1225 its low probability of detection and interception characteristics. 3.1 FUNCTIONAL DESCRIPTION The Model 1225 block diagram can be divided into two sections.
APPLIED TECHNOLOGY SOLUTIONS, INC. In the receive direction, the FPGA demodulates the BPSK (binary phase shift keyed) signal from the 2 IF to recover the scrambled digital data. At the same time, the lock detector determines when a valid system signal is present, and controls the lock functions. . The demodulator produces the baseband data signal, which is a scrambled CVSD data stream. The descrambler removes the scrambler key stream from the baseband data signal to recover the CVSD RX data signal.
APPLIED TECHNOLOGY SOLUTIONS, INC. These signals drive the despreader mixer which produces a BPSK at the 2nd IF frequency. This signal is further amplified and filtered, prior to going to the FPGA for demodulation. Receive AGC control for the RF and first IF amplifiers is generated from the composite IF signal by the AGC generator. The AGC loop maintains a fixed signal level at the despreader output.
APPLIED TECHNOLOGY SOLUTIONS, INC. SECTION FOUR MAINTENANCE 4.0 TROUBLESHOOTING When supplied with power, the top panel PWR LED should light. If the PWR LED blinks, the battery is low and must be replaced or recharged. If the PWR LED does not illuminate at all, verify LED operation by keying the transmitter and verifying the TX indicator lights. If the TX LED does not illuminate, attach different battery pack and retry. If the LED still does not illuminate return the unit for repair.
APPLIED TECHNOLOGY SOLUTIONS, INC. Document: FCC1225manual.
APPLIED TECHNOLOGY SOLUTIONS, INC. Document: FCC1225manual.
APPLIED TECHNOLOGY SOLUTIONS, INC. Document: FCC1225manual.
APPLIED TECHNOLOGY SOLUTIONS, INC. Document: FCC1225manual.
APPLIED TECHNOLOGY SOLUTIONS, INC.
