TYPE OF EXHIBIT: INSTRUCTION MANUALS FCC PART: 2.1033 (c)(3) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: SST-442 TYPE OF UNIT: UHF-FM Handheld Transceiver FCC ID: AIERIT13-442 DATE: May 11, 2001 Included in this exhibit is a draft of the Maintenance and Operating Manual for RITRON Model Patriot SST-442 UHF-FM Handheld Transceiver.
TWO-WAY RADIO BY RITRON RITRON MODEL SST-442 UHF FM BAND PROGRAMMABLE HANDHELD RADIO MAINTENANCE / REPAIR / OPERATING MANUAL FOR USE BY AUTHORIZED SERVICE/MAINTENANCE PERSONNEL ONLY SST-442-MRM REV A COPYRIGHT 2001 RITRON, INC. • ALL RIGHTS RESERVED RITRON, JOBCOM, and QUIET CALL, ARE REGISTERED TRADEMARKS OF RITRON, INC.
TABLE OF CONTENTS TOPIC SST-442 PAGE TOPIC PAGE IMPORTANT MAINTENANCE/REPAIR INFORMATION .. 1 THEORY OF OPERATION SPECIFICATIONS INTRODUCTION ............................................................. 16 POWER SUPPLY AND VOLTAGE DISTRIBUTION........ 16 Power Strobe............................................................. 16 Low Battery Voltage Detection................................... 16 REFERENCE OSCILLATOR ........................................... 16 SYNTHESIZER ........................
IMPORTANT REPAIR / MAINTENANCE INFORMATION SST-442 Surface Mount Repair PC Board Removal - Special Tool RITRON surface mount products require special equipment and servicing techniques. Improper servicing techniques can cause permanent damage to the printed circuit boards and/or components, which is not covered by RITRON’s warranty. If you are not completely familiar with surface mounted component repair techniques, RITRON recommends that you defer maintenance to qualified service personnel.
SPECIFICATIONS SST-442 CONTROLS GENERAL FCC ID: AIERIT13-442 FCC Rule Parts: 22, 74, 90, 95 Frequency Range: 450 to 470 MHz Max. Freq. Separation: 10 MHz RF Channels: Up to 10 Channels, Independent TX/RX frequencies. Push Button Controls: On/Volume Up, Volume Down/Off, PTT, Channel Speaker Beep Indicators: Synthesizer Step Size: 12.5 KHz Frequency Stability: +/-2.
SPECIFICATIONS SST-442 BATTERY RECEIVER Wide band Models Narrow band Models Battery Pack: Modulation Acceptance: +/- 7.0 KHz +/- 3.75 KHz Sensitivity: (12 dB SINAD) 0.25 µV +7.2 VDC, 800 mAH rechargeable NiCd battery pack standard +7.2 VDC, 1500 mAH rechargeable MiMH battery pack optional 0.
INTRODUCTION SST-442 FCC REGULATIONS GENERAL RITRON's SST-442 handheld is a small, programmable two-way radio, designed to operate in the 450-470 MHz professional FM communications band. This handheld features push-button operating controls, with the Push-To-Talk and Channel buttons on one side of the radio. The On / Volume Up and Volume Down / Off, volume and monitor controls are on top. Each radio can be “dealer” programmed to contain a unique set of operating frequencies and options.
BATTERY CARE SST-442 BATTERY REPLACEMENT CHARGING The handheld is powered by a rechargeable battery, which fits into the radio case (see FIG-1). The battery pack can lose its charge during storage and shipment, and should be fully charged before the radio is used. Thereafter, the battery should be charged overnight after each day of use, to ensure peak radio performance for the next day. Using the cube charger (model BC-A), the battery should charge completely in 12 hours.
BATTERY CARE SST-442 BATTERY CONDITIONING BATTERY MAINTENANCE With daily use and recharging, a battery’s service life is about one year. To ensure maximum service life, follow these guidelines: • DO NOT discharge a battery that is already “run down.” If the battery cannot power your radio, recharge the battery. • DO NOT overcharge a battery. The standard battery should not be left to charge continuously. • Condition battery packs once a month as directed in Battery Conditioning.
OPERATION SST-442 DESCRIPTION OF CONTROLS AND CONNECTORS Antenna The flexible antenna radiates and receives radio signals. Before using the radio, be sure the antenna base is threaded fully into the radio’s antenna bushing. Antenna Jack Cover Use only the antenna(s) available from RITRON for the SST-442. Do not attempt to substitute with any other antenna. Vol Down/Off Audio Accessory Jack On/Volume Up On/Vol Up This button switches on the radio, then increases the volume if you continue to press.
OPERATION SST-442 RADIO OPERATION On-off/Volume To switch on the radio - press the On/Volume Up button. The radio will beep a number of times equal to the current channel number. To adjust the volume - press the volume up button until you reach the desired level. You should hear noise and any broadcasts on the channel. To turn off the radio - press and hold the Off/Volume Down button until two tones sound. To determine whether the radio is on - press the volume down button.
OPERATION SST-442 WHAT THE RADIO TONES MEAN OPTIONAL RADIO TONES The handheld responds to certain instructions by sounding a beep or series of tones. These tones can tell you whether the radio is working as you expect. The SST-442 can be programmed using the RITRON PC Programmer for optional alert tones. Receive Squelch Tone Power On/Self Check “OK” When it is first turned on, the radio runs a quick “self test” to confirm basic functions.
OPERATION SST-442 TROUBLESHOOTING If you have trouble operating the handheld, review the radio controls and operation sections. If you think the radio is malfunctioning, check the following table. GENERAL The radio does not work at all. • • Make sure the battery is installed correctly, as shown in FIG-1. Recharge or replace the battery. (See note 1.) An error tone sounds while you are talking. (and the transmitter shuts off). • BATTERY The battery loses its charge sooner than expected.
PROGRAMMING THE RADIO SST-442 PROGRAMMING METHODS Each SST-442 can be programmed to operate on up to 10 channels. The SST-442 may be programmed using the Push-to-Talk switch or an optional RITRON PC programming kit. PTT (PUSH-TO-TALK) PROGRAMMING allows you to program any channel to one of the radio frequencies listed in Table 1 and any Quiet Call code listed in Table 2. The radio will transmit and receive on the programmed table frequency and QC code.
PROGRAMMING THE RADIO SST-442 PTT Programming a Radio Channel Four valid digits must be entered for the radio to accept PTT programming. The first two digits entered are the frequency code from Table 1, followed by the two digits for the QC code from Table 2. 1. Place the radio in Program / Readout mode as described in Fig-3 on page 11. 2. Press the Channel Selector button to select the radio channel you would like to program. 3.
PROGRAMMING THE RADIO SST-442 COMPUTER SOFTWARE COPYRIGHTS Code Frequency Description 01 02 03 04 05 06 07 08 09 10 11 12 467.7625 467.8125 464.5500 464.5000 467.8500 467.8750 467.9000 467.9250 469.2625 462.5750 462.6250 462.6750 J K Yellow Dot Brown Dot Silver Star Gold Star Red Star Blue Star White Dot Black Dot Orange Dot Table 1 – PTT Programming Frequency Table QC Code Freq (Hz) QC Code Freq (Hz) 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 67.0 71.9 74.
PROGRAMMING THE RADIO SST-442 Programmable Features Descriptions of Features The following features may be programmed on a per channel basis, or will affect all channels together. Automatic Inactivity Turn-off - The radio automatically shuts itself off if four hours go by without the microcontroller detecting input from the volume, PTT or channel controls.
PROGRAMMING THE RADIO SST-442 Quiet Call (CTCSS) - Programming a Quiet Call code allows you to screen out transmissions that do not carry your code. Your code is broadcast when you press the PTT to make a call. Quiet Call Encode Only - The Quiet Call code programmed for the channel is transmitted with your calls. However, no Quiet Call code is programmed for receive mode, allowing all traffic on the channel to be heard. Receive Frequency - The radio frequency that receives broadcasts from other units.
THEORY OF OPERATION INTRODUCTION The SST-442 is a four-channel handheld transceiver built on a single multi-layer printed circuit board. Both sides of the main printed circuit board are populated with components, with the bottom side containing only surface mounted components. The SST-442 is frequency synthesized, with all functions of the radio controlled by microcontroller. POWER SUPPLY AND VOLTAGE DISTRIBUTION The SST-442 is powered by an internal 6-cell rechargeable battery pack.
THEORY OF OPERATION to change divisors is determined by the channel frequency. IC401 contains a digital phase detector that works as follows: when an operating channel is changed or the receive/transmit mode switched, a new synthesizer operating frequency is selected. Microcontroller IC301 clocks new data into IC401 internal buffer in synchronization with clock pulses. The channel information is stored in EE memory of IC302 and is loaded into RAM when the channel is selected.
THEORY OF OPERATION 1st Mixer The amplified received input signal is applied to the gate of FET mixer Q103. The 1st local oscillator signal from the synthesizer module is applied to the source of Q103. L106, C117 and C118 tune the drain output of Q103 to 43.65 MHz and apply it to YF101, a 43.65 MHz two-pole crystal filter. Q104 and associated components amplify the 43.65 MHz IF signal and apply it to the input of the 2nd mixer at Pin 16 of IC101.
THEORY OF OPERATION ANTENNA SWITCHING / LOW PASS FILTER A low-pass filter comprised of filter L203, C213, C214, L204, C217, L207, and C216 removes harmonics from the transmitter output before applying the RF signal to the antenna. Received signals pass through the low-pass filter before entering the receiver RF amplifier circuitry. Two PIN diodes (CR201, CR101) and associated components form the antenna switching circuit.
THEORY OF OPERATION MICROCONTROLLER The SST-442 handheld transceiver is electronically controlled by IC301, an 8-bit microcontroller. IC301 has four 8-bit A/D inputs for processing analog signals. PIN DESCRIPTION 1 RESET is connected to the SST-442 +5V to start the radio in a known state on power up. 2 TX KEY input is pulled LOW when either the internal or external PTT switch is pressed to initiate transmitter operation.
ALIGNMENT PROCEDURE WARNING! SST-442 7) An authorized RF service technician must perform test and alignment of the SST-442. Do not attempt service of the SST-442 if not completely familiar with the operation of frequency synthesized radio operation. The SST-442 can operate in both Narrow Band (2.5 KHz deviation) and Wide Band (5 KHz deviation) systems.
ALIGNMENT PROCEDURE SST-442 TRANSMITTER VOICE DEVIATION MODULATION BALANCE Transmitter modulation balance has been set at the factory and should not require adjustment. Transmitter voice deviation has been set at the factory and should not require adjustment. 1) Select “Mod Bal” from the PC Programmer “Alignment” screen. 1) Select “Voice” from the PC Programmer “Alignment” screen. 2) Set the RF communications test set to the Alignment Frequency on the Alignment screen.
ALIGNMENT PROCEDURE SST-442 SYNTHESIZER RECEIVER NOISE SQUELCH The noise squelch sensitivity is set at the factory for a 12dB SINAD signal. Using the PC Programmer, squelch sensitivity can be adjusted on a per channel basis by adjusting the “Squelch Tightener” number to between 0-7. The higher number will require a stronger received signal to open squelch. 1) Select “Channel” from the PC Programmer “Edit” menu on the main screen. 2) Select the channel to be set and press “Edit” button.
VOLTAGE CHART SST-442 Measurement Conditions REF Supply voltage at 7.5 VDC, radio in operating mode, volume control at minimum, power strobe enabled, transmitter set for full power. CR402 IMPORTANT: Because the SST-442 portable is constructed with grounding sub-planes, use a system ground in the same proximity as the circuit being measured. All readings indicated as GND are true system ground. KEY: All measurements are in VDC unless indicated otherwise.
VOLTAGE CHART REF IC303 IC304 IC305 IC306 IC307 PIN TX 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2.4 2.4 2.4 5.0 2.4 2.4 2.4 2.4 2.4 2.4 GND 2.4 2.4 2.4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 RX SST-442 SB DESCRIPTION REF 2.4 * 2.4 * 2.4 * 5.0 * 2.4 * 2.4 * 2.4 * 2.4 * 2.4 * 2.4 * GND GND 2.4 * 2.4 * 2.4 * Audio processing IC308 1 2 3 4 5 6 7 8 2.4 2.4 GND 5.0 2.4 2.4 5.0 3.2 2.4 * 2.4 * GND GND 5.0 * 2.4 * 2.4 * 5.0 * 3.2 * Tone low pass filter IC309 1 2 3 4 5 7.5 GND 7.5 NC 5.0 7.5 GND 7.
VOLTAGE CHART REF PIN TX RX SST-442 SB DESCRIPTION Q 204 1 2 3 0.2 0.0 0.0 GND GND GND 7.0 0.0 0.0 TX RF driver amplifier Q 205 1 2 3 GND GND GND 0.0 0.0 0.0 7.5 7.5 7.5 TX RF Final amplifier Q 301 1 2 3 5.0 0.0 0.0 GND GND GND 0.0 5.0 5.0 PTT detection Q 302 1 2 3 4.3 5.0 5.0 5.0 5.0 0.0 5.0 5.0 0.0 PTT detection Q 303 1 2 3 5.0 4.3 6.8 5.0 4.3 6.8 5.0 4.3 6.8 Battery +V switching Q 304 1 2 3 6.8 7.5 7.5 6.8 7.5 7.5 6.8 7.5 7.5 Battery +V switching Q 306 1 2 3 4.3 5.
SCHEMATIC REFERENCE PARTS LIST SST-442 NOTE: This parts list reflects the most current component values. If a component value given in the schematic differs from this list, the parts list should be considered the most current.
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description C304 C305 C306 C307 C309 C310 C311 C312 C313 C314 C315 C316 C317 C318 C319 C320 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C331 C332 C333 C334 C335 C336 C337 C338 C339 C340 C341 C342 C343 C344 C345 C346 C347 C348 C349 C350 C351 C352 C353 C354 C355 C356 C357 C358 C359 C360 C361 C362 C363 C364 C365 C366 C367 C368 15181102 15180101 15180101 15182103 15182103 15119104 15181102 15182103 15181102 15181102 15181102 15182103 15181102 15181102 15181
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description C369 C370 C371 C372 C373 C374 C401 C402 C403 C404 C405 C406 C407 C408 C409 C410 C411 C412 C413 C414 C415 C416 C417 C418 C419 C420 C421 C422 C423 C424 C425 C426 C427 C428 C429 C430 C431 C432 C433 C434 C435 15180101 15181102 15181102 15111103 15119104 15181102 15180101 151104A7 15181102 15181102 15180101 151101A5 151104A7 151104A7 15119104 151104A7 15180101 15181102 151102A7 152B6106 15181102 15180101 15180101 15180101 15181102 15181102 15180101 151
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description SST-442 X Y Theta Loc INTEGRATED CIRCUITS IC101 IC301 IC302 IC303 IC304 IC305 IC306 IC307 IC308 IC309 IC401 31030003 314G0306 31210005 310K0004 311K0003 310K0003 310K0001 31010004 310K0002 310E0002 313K0005 MC3371D SUBSYSTEM IC, SO-16 314 MCU, 28 PIN, SOIC, SST/JMX 4 SERIES v06 992 EEPROM, 512X8, 24C04 989 LMV324MT RAIL TO RAIL QUAD OP AMP 474 SWITCH,ANALOG,TRIPLE SPDT,4053,TSSOP-16 226 LMV358MM DUAL OP AMP, GP LV R/R TSSOP 404 DS1806E 6 PROG
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description Q301 Q302 Q303 Q304 Q306 Q307 Q308 Q401 Q402 Q403 Q404 Q405 Q406 48010R02 4801002A 4801001Q 480100DH 480100DH 4801001Q 480100DH 482100V0 482100V0 482100V0 4801001Q 4801006A 48010R02 SST-442 X Y Theta Loc MUN2211T1, NPN, INT 10K/10K BIAS, "8A", MMBT3906 PNP, SOT23 MMBT5088, NPN, SOT-23 BCW68GLT1 .8AMP PNP SOT-23 BCW68GLT1 .8AMP PNP SOT-23 MMBT5088, NPN, SOT-23 BCW68GLT1 .
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description R319 R320 R321 R322 R323 R324 R325 R326 R327 R328 R329 R330 R331 R332 R333 R334 R335 R336 R337 R338 R339 R340 R341 R342 R343 R344 R345 R346 R348 R349 R350 R352 R353 R354 R355 R356 R357 R358 R359 R362 R401 R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414 R415 R416 R417 R418 R419 R420 R421 R422 R423 47180471 47180471 47180103 47180393 47180823 47180224 47180104 47180183 47180183 47180103 47180153 47180100 47180104 47180154 47180473 4
SCHEMATIC REFERENCE PARTS LIST SST-442 SPEAKER SP301 05500045 SPEAKER, 45MM, 1W, LOW PROFILE SST/RTX 0 0 0 Bottom SWITCH SPST MOMENTARY MINI PC 260GM SWITCH SPST MOMENTARY MINI PC 260GM SWITCH, TACT LO PROFILE RT ANGLE 160gf SWITCH, TACT LO PROFILE RT ANGLE 160gf 268 788 82 82 4587 4588 3097 3948 180 180 270 270 Top Top Top Top 455KHZ IF TRANSFORMER (5MM) 128 1822 180 Top 23050003 TCVCXO, 14.400 MHz, 1.5 PPM, VC=30 PPM/V 146 837 90 Top 02301403 02301013 43.
SCHEMATIC REFERENCE PARTS LIST Ritron PN SST-442 Description SST-442 MODELS ONLY CASE LABELS 14220001 14222029 14290002 14200037 14200100 LABEL, CONTROLS, SST LABEL, NAMEPLATE, SST BLANK LABEL, .75" X .25" GLOSSY WHITE LABEL SST/JMX MFG DATE CODE LABEL, FCC SERIAL, SST-442 BATTERY PACK AND INSULATOR BPS-6N-SC 14230088 25300600 25606000 25601600 BATTERY,RECHG,7.
