ATH2425384

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A Division of Transcrypt EF Johnson ® , A Division of Transcypt Operations Center:, 299 Johnson Avenue• Waseca, MN 56093 800-328-3911•507-835-6222•Fax 507-835-8356 Transcrypt International, Incorporated Corporate Headquarters: 4800 NW 1 st Street •Lincoln, NE 68521 800-894-2615•402-474-4800•Fax 402-474-4858 www.transcrypt.com e  Radio Systems Secure Office  Solutions Crypto-Voice-Plus  Technology 22 March, 1999 Linda Elliot Federal Communications Commission Electronic Filing, OET Equipment Authorization Internet:www.fcc.gov RE: Correspondence Reference Number: 6536 731 Confirmation Number: EA93417 Pursuant to Section 0.457 (d) (1) (ii) and 0.459 of the commission's rule, EF Johnson requests confidential of some of the information accompanying with this application. Block Diagram, Schematic Drawings and Technical Descriptions items to confidential is found in: Circuit Description These materials contain trade secrets and proprietary information should not be available to the public. The public disclosure of these matters might be harmful to EF Johnson and could benefit our competitors. EF Johnson understand that pursuant to rule 0.457 (d) (1) (ii), disclosure of the application and all the documentation will not be available prior of the grant for this application. Sincerely, John Oblak Director, Wireless Product Engineering Cc: Jay Holcomb file

Page 1 of 2 FCC LABEL: RULE PART NUMBER:2.983 (f) The label is located on the outside bottom of the chassis near the heat sink. Page 2 of 2 FCC ID: ATH2425384

008-5384-001 Page 1 of 4 PHOTOGRAPHS: RULE PART NUMBER:2.983 (g) Top view without covers (RF board with shield and PA) 008-5384-001 Page 2 of 4 PHOTOGRAPHS: RULE PART NUMBER:2.983 (g) Top view without covers (RF board without shield) 008-5384-001 Page 3 of 4 PHOTOGRAPHS: RULE PART NUMBER:2.983 (g) Bottom view without covers (logic) 008-5384-001 Page 4 of 4 PHOTOGRAPHS: RULE PART NUMBER:2.983 (g) Back of control head view (showing PCB and speaker, mid tier)

008-5384-001 Page 1 of 6 DESCRIPTION OF CIRCUITRY RULE PART NUMBER:2.983 (d)(10) THEORY OF OPERATION 1.0 PURPOSE This report has been prepared to support the application for FCC Type Acceptance PER CODE OF FEDERAL REGULATIONS, TITLE 47, PARTS 2 AND 90 for the transmitter subsystem of the Transcrypt International / E.F. Johnson Radio Systems Model 242-538X Mobile. The report presents necessary information concerning electrical circuit description, measured performance and physical construction and configuration. 2.0 MOBILE Introduction The 5300-series transceivers contain the PC board assemblies listed below. Components are mounted on only the top side of all boards. Therefore, most components can be changed without removing the board from the chassis. General descriptions of the main sections such as the receiver, synthesizer, and exciter follow and detailed descriptions are located in later sections. RF Board - Contains the receiver, synthesizer, and exciter sections. PA Board - Contains the transmitter power amplifier section. Audio/Logic - Contains the control logic and audio processing sections. Display - Contains the display, display controller, and interface processor. Interface - This small board provides the electrical connections between the display and audio/logic boards. It also contains the front panel controls and microphone jack. Circuit Protection (Fuses) Circuit protection is provided by a 15-ampere in-line power cable fuse, 3-ampere fuse F500 on the RF board (in the UN- switched battery supply line from the PA board), and by voltage regulators which automatically limit current. The 15- ampere power cable fuse protects the driver and final stages on the power amplifier board, and the 3-ampere fuse protects the remainder of the circuitry. In addition, there are two 0.6-ampere fuses on the audio/logic board. One fuse (F100) limits the current of the switched battery supply fed to accessory connector J101 and the microphone jack on the interface board. The other fuse (F300) limits the current of the 8-volt supply fed to modem jack J301. Analog Mode Receive Mode The signal is routed from the antenna connector to the RF Board where it is filtered, amplified, and mixed with the first local oscillator frequency generated by the synthesizer. The resulting IF signal is also filtered and amplified and sent to the ABACUS chip. The signal is then mixed with the second local oscillator frequency to create a second IF signal of 450 kHz. The second IF signal is then sampled at 14.4 Msps and downconverted to baseband. The baseband signal is then decimated to a lower sample rate that is selectable at 20 kHz. This signal is then routed via a serial interface using a differential current output to the ADSIC chip on the Digital Board. On the Digital Board the ADSIC digitally filters the input signal, performs frequency discrimination to obtain the message signal and then routes the message signal to the DSP. The DSP first performs a carrier- detection squelch function on the radio. If a signal is determined to be present, the audio portion of the signal is resampled to an 8 kHz rate and then filtered appropriately. The filtered signal is then routed back to a D/A in the ADSIC to produce an analog signal for output to the audio power amplifier (PA) and then the speaker. Any detected signaling information is decoded and the resulting information is sent to the microcontroller. Transmit Mode The signal from the microphone is amplified by the audio PA and is then routed to the ADSIC chip where it is first digitized at a 16 ksps rate and then sent to the DSP. The DSP performs the required filtering, adds the desired signaling, converts the sample rate to 48 ksps and then sends the resulting signal back to a D/A in the ADSIC to produce the analog modulation signal for the VCO. The modulated VCO signal is then sent to the RF PA for transmission. 008-5384-001 Page 2 of 6 APCO 25 Digital Mode Introduction In APCO 25 Digital Mode, the carrier is modulated with 4 discrete deviation levels. These levels are ± 600 Hz and ± 1800 Hz. Digitized voice is created using an IMBE™ vocoder. Receive Mode The signal is processed in the same way as an analog mode transmission until after the squelch function is performed. If a signal is detected to be present, the DSP resamples the signal from 20 kHz to 24 kHz. This is done so that the sample rate is an integer multiple (5x) of the data rate of the digital modulation which is 4800 symbols/sec (9600 bits/sec). The resampled signal is then processed by a demodulator routine to extract the digital information. The resulting bit stream (9600 bps) is sent to a routine that performs unframing, error-correction, and voice decoding. The result of these operations is a reconstructed voice signal sampled at 8 kHz. The sampled voice signal is sent to a D/A in the ADSIC to produce an analog signal for output to the audio power amplifier and speaker. Transmit Mode The microphone signal is processed as in analog mode until it reaches the DSP. At this point the audio signal is processed by a voice encoding routine to digitize the information. The resulting samples are then converted to a bit stream that is placed into the proper framing structure and error protected. The resulting bit stream has a bit rate of 9600 Hz. This bit stream in then encoded, two bits at a time, into a digital level corresponding to one of the four allowable frequency deviations. This produces 16-bit symbols with a rate of 4800 Hz. The symbols are resampled to a rate of 48 kHz and filtered to comply with channel bandwidth requirements. The filtered signal is then sent to a D/A in the ADSIC to produce the analog modulation signal for the VCO. The modulated VCO signal is then mixed up to the final transmit frequency and then sent to the RF PA for transmission. RF Board NOTE: The RF Board is not field serviceable. It must be replaced as a unit with a new board. The receiver front end consists of a preselector…

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008-5384-001 Page 1 of 3 TRANSISTOR, DIODE, AND IC FUNCTIONS RULE PART NUMBER:2.983 (d)6) Transmitter JEDEC or DesignatorPart Number Vendor TypeFunction A 201 587-5000-003 NUF6411J 800 MHz RF Module Power Amplifier Board CR 508523-2906-001MR2535L Transient Suppresser CR 601523-2016-120BZX84C12LT1 Power Control CR 501523-1504-032MA47059-1079 Antenna Switch CR 509523-1504-016MMBD701LT1 Detector Diode CR 502523-1504-032MA47059-1079 Antenna Switch Q 502576-0003-612MMBT4403LT1 Power Control Q 506576-0003-6582N3904 Switch Q 509 576-0004-817 MRF847 RF Power Transistor U 504544-4001-127MHW2821-1 RF Power Module 008-5384-001 Page 2 of 3 TUNING PROCEDURE For Stealth Mobile Radio 1.0 Software Installation Insert disk #1 into drive A: and from the start button on Win 95 choose “Run...”. You then can select “Setup” from drive A: and follow the installation instructions. The Tuning software will add a shortcut on your start menu. You should have two installation disks. 2.0 Connection to Radio Connect one of the 9 Pin serial ports on your PC through a RPI box to the Stealth Mobile radio with the Hardware provided. 3.0 Tuning Procedure Upon start up, the tuning software will instruct the user to select mobile or portable radios to be tuned. Make sure to select the appropriate type of radio. Select “Complete Tuning” under Tuning on the menu bar to start tuning of the radio. The software will then connect to the radio indicating band type. A message box will instruct you as it steps through the tests listed below. 3.1 TX Frequency The radio should be connected as instructed by the software. Prepare the Monitor to measure the indicated frequency and click the OK button, the software will make the radio transmit on the appropriate frequency. Next Click on the “+” and “-“ buttons to decrease the frequency error, when you get as close as possible click the OK button to end the test. 3.2 TX Modulation The radio should be connected as instructed by the software. Click on the OK button and type in Deviation into the dialog box as measured by the monitor. Then simply follow the instructions. You will be adjusting the Deviation with the “+” and “-“ buttons between two values for each of the transmit frequencies. 3.3 TX Power The radio should be connected as instructed by the software. The radio will transmit on different frequencies and you are instructed to click on the “+” and “-“ buttons to adjust the TX power. 3.4 RX Sensitivity This test doesn’t take place on all band!!. The radio should be connected as instructed by the software. Generate the instructed signals with your monitor and click on the OK button for the radio to make measurements over a range of frequencies. 3.5 Squelch The radio should be connected as instructed by the software. Adjust the RF level of the generated signal to produce the instructed SINAD level (12dB or 8dB) and click on the OK button. The radio will be taking measurements. 008-5384-001 Page 3 of 3 3.6 RSSI The radio should be connected as instructed by the software. Adjust the RF level as instructed and click the OK button. The radio will be taking measurements and will repeat for different RF levels. 4.0 Power Down The radio will reset it self after tuning is complete.

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