TYPE OF EXHIBIT: INSTRUCTION MANUALS FCC PART: 2.1033 (c) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: SST-144 TYPE OF UNIT: VHF-FM Handheld Transceiver FCC ID: AIERIT13-144 DATE: April 25, 2001 Included is a draft of the Maintenance and Operating Manual for RITRON Model Patriot SST-144 VHF-FM Handheld Transceiver.
TABLE OF CONTENTS TOPIC SST-144 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-144 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-144 CONTROLS GENERAL FCC ID: AIERIT13-144 FCC Rule Parts: 22, 74, 90, 95 Frequency Range: 150 to 162 MHz Max. Freq. Separation: 12 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: 5 KHz Frequency Stability: +/-2.
SPECIFICATIONS SST-144 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-144 FCC REGULATIONS GENERAL RITRON's SST-144 handheld is a small, programmable two-way radio, designed to operate in the 150-162 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-144 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-144 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-144 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-144. 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-144 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-144 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-144 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-144 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-144 PROGRAMMING METHODS Each SST-144 can be programmed to operate on up to 10 channels. The SST-144 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-144 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-144 COMPUTER SOFTWARE COPYRIGHTS Code Frequency Description 01 02 03 04 05 06 07 08 09 10 11 12 154.600 154.570 151.625 151.955 151.925 154.540 154.515 154.655 151.685 151.715 151.775 151.805 Green Dot Blue Dot Red Dot Purple 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 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.
PROGRAMMING THE RADIO SST-144 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. Feature Battery Saver - Enabling this option allows the radio to go into battery saver mode when the radio remains idle.
PROGRAMMING THE RADIO SST-144 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-144 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-144 is frequency synthesized, with all functions of the radio controlled by microcontroller. POWER SUPPLY AND VOLTAGE DISTRIBUTION The SST-144 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 L208, C222, C219, C218, C217, L207, and C220 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-144 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-144 +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 SST-144 7) WARNING! An authorized RF service technician must perform test and alignment of the SST-144. Do not attempt service of the SST-144 if not completely familiar with the operation of frequency synthesized radio operation. The SST-144 can operate in both Narrow Band (2.5 KHz deviation) and Wide Band (5 KHz deviation) systems.
ALIGNMENT PROCEDURE SST-144 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 RECEIVER SENSITIVITY AND SQUELCH The SST-144 receiver is factory tuned for a frequency range of 150 - 162 MHz. The SST-144 receiver is configured from the factory for Wide Band operation, with a Narrow Band Model available as an option. The SST-144 receiver bandwidth is configured on a per radio basis, it cannot be switched on a per channel basis. The receiver may be programmed to any frequency between 150-162 MHz.
VOLTAGE CHART SST-144 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-144 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-144 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 SST-144 PIN TX RX SB DESCRIPTION Q 204 1 2 3 0.5 0.0 5.3 0.0 0.0 0.0 0.0 0.0 0.0 TX RF driver amplifier Q 301 1 2 3 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 5.0 5.0 4.3 5.0 5.0 5.0 5.0 * +5V switching Q 307 1 2 3 0.0 0.0 7.5 5.0 4.3 6.8 0.0 0.0 7.
SCHEMATIC REFERENCE PARTS LIST SST-144 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 C308 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 C365 C366 C367 C368 C369 C370 C371 C372 15111102 15182103 15119104 15181102 15182103 15181102 15181102 15181102 15182103 15181102 15181102 15181102 15181102 15181102 15180
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description C373 C384 C401 C402 C403 C404 C405 C406 C409 C410 C411 C412 C413 C414 C415 C416 C417 C418 C419 C420 C421 C423 C424 C425 C426 C427 C428 C429 C430 C431 C432 C433 C434 C435 C436 15119104 152B6106 15180101 15110101 15181102 15180101 15181102 15110101 15119104 15110100 15111102 15181102 151105A6 152B6106 15181102 15180101 15181102 15180101 15181102 15181102 15180101 151101A0 151105A6 15180101 15111103 152AB224 15181102 15111223 15180101 15110100 151801
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description IC306 IC307 IC308 IC309 IC401 310K0001 31010004 310K0002 310E0002 313K0005 02100001 02100053 SST-144 X Y Theta Loc DS1806E 6 PROG POTS 10K OHM 20-PIN TSSOP 242 LM386MX-1 AUDIO AMP SO-8 1331 MAX7410 5TH ORDER SW CAP BUTTERWORTH LPF403 REGULATOR,LDO,LP2980,5V,W ENABLE,SOT-25 162 SYNTHESIZER, MC145193, TSSOP 891 2185 567 2935 504 1265 0 90 0 0 180 2.5MM PC-MT JACK; ANT-CHGR 3.5MM STEREO JACK; PANEL MOUNT 1178 1560 4668 4646 0 0 4.
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description SST-144 X Y Theta 527 175 645 756 565 469 388 251 167 411 529 349 489 551 155 155 117 49 9 78 800 669 908 1555 1618 1384 899 536 475 316 623 410 535 998 1127 1257 704 461 704 1184 1260 738 760 799 704 705 643 752 294 371 332 416 585 624 479 174 664 269 207 246 561 39 3955 3530 4275 4355 4187 3824 3484 3450 3450 946 904 966 946 966 2174 2089 1676 1486 1486 1635 3384 3248 3151 2244 2264 3842 4425 686 479 546 639 547 1867 3143 3328 2891 2191 4622
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description R336 R337 R338 R339 R340 R341 R342 R343 R344 R345 R346 R347 R348 R349 R350 R351 R352 R353 R354 R355 R356 R357 R358 R359 R360 R361 R401 R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414 R415 R416 R417 R418 R419 R420 R421 R422 R423 R424 R425 47180104 47180103 47180224 47180394 47180104 47180104 47180184 47180564 47180104 47180104 47180102 47180100 47180473 47180473 47180224 47180222 47100225 47180103 47180102 47180103 47180273 4718010
SCHEMATIC REFERENCE PARTS LIST Ref Ritron PN Description SST-144 X Y Theta Loc TRANSFORMER T101 05600018 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 43.650 MHz Crystal Filter +/-6.0KHz UM-1 FILTER,CERAMIC,450KHz,+/-7.
SCHEMATIC REFERENCE PARTS LIST Ritron PN SST-144 Description SST-144 MODELS ONLY CASE LABELS 14220001 14222029 14290002 14200037 14200104 LABEL, CONTROLS, SST LABEL, NAMEPLATE, SST BLANK LABEL, .75" X .25" GLOSSY WHITE LABEL SST/JMX MFG DATE CODE LABEL, FCC SERIAL, SST-144 BATTERY PACK AND INSULATOR BPS-6N-SC 14230088 25300600 25606000 25601600 BATTERY,RECHG,7.