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SmarTrunk ST-2112C Service Manual

Summary of ST-2112C

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    St-2112c (400mhz ~ 470mhz) uhf fm digital transceiver service manual smartrunk systems, inc. St-2112c sm r1.2.

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    St-2112c sm r 1.2 smartrunk systems, inc. 2 table of contents 1. Specifications: ............................................................................................................................... 5 2. St-2112 exploded view ...................................................................

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    St-2112c sm r 1.2 smartrunk systems, inc. 3 5.5.2.1. High power level alignment ..................................................................................... 17 5.5.2.2. Mid power level alignment ...................................................................................... 18 5.5.2....

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    St-2112c sm r 1.2 smartrunk systems, inc. 4 8.1.3. Leds: .................................................................................................................................... 29 8.2. Tones ...................................................................................................

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    1. Specifications: specification st-2112c g en er a l frequency range [mhz] 400 to 470 channels 512 groups/banks 64 power [vdc] 6.4 to 8.8 dimensions [mm] 130(h)x36(d)x52(w) weight [gr] (oz) 320 - (11.3) temperature range - 30 °c ~ 60 °c (-22°f ~ +140°f) signaling 51 ctcss tones / 183 dcs tones / 65...

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    2. St-2112 exploded view st-2112v jack chang daniel martin 2 . St-2112 exploded view.

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    3. St-2112 simplified diagram lpf ant sw d1/d3 final amp q1 power detection d2 driver q3 buffer amp q2 tx ctrl [u3] clock [y1] power ctrl [u2] flash memory [u4] ram memory [u7] display gps g-sensor pwm keyboard side keys usb serial port main processor [u8] radio u1 audio processor modem [u5] vocoder...

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    Notes:.

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    St-2112c sm r 1.2 smartrunk systems, inc. 9 4. - st-2112 rf description 4.1. Circuit configuration the receiver is a single receiver with built-in dsp fully integrated. Incoming signals from the antenna, after passing through lpf filter, are fed direct to the dsp down converter to get the baseband v...

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    St-2112c sm r 1.2 smartrunk systems, inc. 10 expected for the current programmed squelch threshold, then the processor analyzes the expected signaling programmed on the current channel table. In case of not any signaling is required, or the signal has been detected, the processor ask to the audio pr...

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    St-2112c sm r 1.2 smartrunk systems, inc. 11 and fed it to the audio power amplifier (u10). 4.3. Transmitter system 4.3.1. Analog tx signal the af signal from the internal microphone (mk1) or external microphone (j5) are processed as differential signal, then it is conditioned and transformed into c...

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    St-2112c sm r 1.2 smartrunk systems, inc. 12 4.3.4. Automatic transmit power control the rf power detector (rb705d) detects transmitted feedback then sends the readout to audio processor u5 (cmx-7141). Audio amplifier compares the transmitted power against the referred level stored on current channe...

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    St-2112c sm r 1.2 smartrunk systems, inc. 13 5. Rc-2112 alignment 5.1. Introduction the st-2112 series is carefully aligned in factory for the specified performance, across the frequency range depending for each version. Realignment should therefore not be necessary except in the event of a componen...

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    St-2112c sm r 1.2 smartrunk systems, inc. 14 all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented. Required test equipment rf signal generator with calibrated output level at 1 ghz deviation meter (linear detector) in-line w...

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    St-2112c sm r 1.2 smartrunk systems, inc. 15 in case the battery has not enough charge, the test will be aborted by the software. Please ensure the battery has more than 50% of remaining charge to complete the test. 5.4. Main radio alignment before setup any parameter, run sdr programming software t...

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    St-2112c sm r 1.2 smartrunk systems, inc. 16 7.5v power supply pc compatible on line wattimeter 30db pad deviation meter frequency counter setup the test equipment as shown for transceiver alignment, apply 7.5 v dc power to the transceiver. The rf parameters are typed on the alignment software to fa...

  • Page 17

    St-2112c sm r 1.2 smartrunk systems, inc. 17 5.5.2. Transmit power alignment: st-2112 has three power levels to be selected for each channel. High, medium and low power level can be aligned as per radio usage requirement. For power alignment, you can do a fine tuning as per your desire frequency sub...

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    St-2112c sm r 1.2 smartrunk systems, inc. 18 otherwise the alignment should be not correct. 5.5.2.2. Mid power level alignment repeat the same procedure to align high power, but select power medium level on the alignment menu. 5.5.2.3. Low power level alignment repeat the same procedure to align hig...

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    St-2112c sm r 1.2 smartrunk systems, inc. 19 lower gain means a very high microphone gain must be assigned to get the proper radio voice deviation, and higher gain means a risk because the max deviation limit must be reached by any signal which makes the limiter to introduce distortion to avoid over...

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    St-2112c sm r 1.2 smartrunk systems, inc. 20 5.5.6. Tdma data modulation alignment: to align 4fsk signaling deviation for tdma mode, select tdma deviation on alignment screen. Actual alignment value will be displayed on alignment slider. Press [start] then move the slider to reach the desired value ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 21 actual alignment value will be displayed on alignment slider. Press [start] then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation. Radio will generate a 100...

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    St-2112c sm r 1.2 smartrunk systems, inc. 22 actual alignment value will be displayed on alignment slider. Press [start] then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation. Radio will generate 123.0...

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    St-2112c sm r 1.2 smartrunk systems, inc. 23 5.6. Receiver alignment setup the test equipment as shown for receiver alignment, apply 7.5 v dc power to the transceiver. The rf frequency must be loaded on receiver frequency of the alignment software to facilitate the alignment within all radio band av...

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    St-2112c sm r 1.2 smartrunk systems, inc. 24 6. Complementary radio alignment 6.1. Battery warning level st-2112 generates acoustic and visual alerts when battery has reached a low voltage. Visual information is displayed on battery icon which flashes with a cross on it when the minimum hardware val...

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    St-2112c sm r 1.2 smartrunk systems, inc. 25 7. Complimentary user alignment the above parameters only can be aligned under dealer login and most of them should be critical for proper radio performance. Additional complimentary parameters should be also aligned on user login mode; it means the user ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 26 for noisy environments or when voice encryption is used, we recommend keeping it as low as possible. Press [ok] to store it in the file. The value will be updated after the file is transferred to the radio. 7.1.3. Analog agc st-2112 has an automated gain ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 27 press [ok] to store it in the file. The value will be updated after the file is transferred to the radio. 7.1.5. Minimum volume level: this alignment lets the user to ensure the speaker level should be audible, evenly when the volume control potentiometer...

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    St-2112c sm r 1.2 smartrunk systems, inc. 28 to disable the rf power amplifier, check the box: press [ok] to store it in the file. The value will be updated after the file is transferred to the radio. 8. Radio appearance alignment radio appearance can be customized as per user requirement. Select ed...

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    St-2112c sm r 1.2 smartrunk systems, inc. 29 the option to activate or deactivate the power on text is disabled. 8.1.3. Leds: future version will allow the user to disable the function of rx and tx led. Some application, as security, sometime demands no lights on the radio. 8.2. Tones second folder ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 30 message back any time squelch function is changed. Check battery level if you want the radio plays a concerning message back any time battery level is below the value programmed as battery warning level on alignment screen. Check power if you want the rad...

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    St-2112c sm r 1.2 smartrunk systems, inc. 31 this page left blank intentionally.

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    9. St-2112 schematic u10 bh7824 ctlr 1 b_out 2 b_in 3 sp_in 4 sp1 5 vcc 6 gnd 7 sp2 8 title size document number rev date: sheet of dm-0911-15 f rc-2112 r1.4 ref lay out 1.4 d 1 1 friday , july 11, 2014 csram paena c173 10nf c44 1nf f1 c2q 3 + c93 10uf c175 1uf c174 1uf 2k2 r141 6.8k d6 dan222 1 3 2...

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    10. St-2112 from board schematic csa sck u4 lis302 vddio 1 gnd 2 vdd 3 gnd 4 gnd 5 vdd 6 cs 7 int1 8 int2 9 gnd 10 gnd 11 miso 12 mosi 13 sck 14 cbl 3vd c21 104 r43 220 3vd 3va +5v +7v d5 d3 d7 d1 jp1 header 18x2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ...

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    11 st-2112 component locator (top layer).

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    St-2112c sm r 1.2 smartrunk systems, inc. 35 12 st-2112 component locator (bottom layer).

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    St-2112c sm r 1.2 smartrunk systems, inc. 36 13 st-2112 pcb top layer.

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    St-2112c sm r 1.2 smartrunk systems, inc. 37 14 st-2112 pcb bottom layer.

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    St-2112c sm r 1.2 smartrunk systems, inc. 38 15 st-2112 pcb ground layer.

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    St-2112c sm r 1.2 smartrunk systems, inc. 39 16 st-2112 pcb power layer.

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    St-2112c sm r 1.2 smartrunk systems, inc. 40 17 st-2112 front board component locator (top layer).

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    St-2112c sm r 1.2 smartrunk systems, inc. 41 18 st-2112 front board component locator (bottom layer).

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    St-2112c sm r 1.2 smartrunk systems, inc. 42 19 st-2112c bom location description value smartrunk pn package main pcb epl211010d c1 cap cer 150pf 50v c0g 0402 150pf ck1151ak5a 0402 c14 cap cer 150pf 50v c0g 0402 150pf ck1151ak5a 0402 c15 cap cer 150pf 50v c0g 0402 150pf ck1151ak5a 0402 c18 cap cer 1...

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    St-2112c sm r 1.2 smartrunk systems, inc. 43 c48 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c65 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c70 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c71 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c73 cap 1000pf 50v ceramic x7r ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 44 c204 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c205 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c206 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c207 cap 1000pf 50v ceramic x7r 0402 1nf ck1102ak5x 0402 c208 cap 1000pf 50v ceramic...

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    St-2112c sm r 1.2 smartrunk systems, inc. 45 c4 cap ceramic .01uf 50v x7r 0402 10nf ck5103ak5x 0402 c20 cap ceramic .01uf 50v x7r 0402 10nf ck5103ak5x 0402 c83 cap ceramic .01uf 50v x7r 0402 10nf ck5103ak5x 0402 c85 cap ceramic .01uf 50v x7r 0402 10nf ck5103ak5x 0402 c90 cap ceramic .01uf 50v x7r 04...

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    St-2112c sm r 1.2 smartrunk systems, inc. 46 c156 cap .10uf 16v ceramic y5v 0402 100nf ck5104ak5x 0402 c167 cap .10uf 16v ceramic y5v 0402 100nf ck5104ak5x 0402 c176 cap .10uf 16v ceramic y5v 0402 100nf ck5104ak5x 0402 c177 cap .10uf 16v ceramic y5v 0402 100nf ck5104ak5x 0402 c100 cap .10uf 16v cera...

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    St-2112c sm r 1.2 smartrunk systems, inc. 47 c183 cap cer 1uf 16v 10% x5r 0402 1uf ck5105ak7r 0402 c217 cap cer 1uf 16v 10% x5r 0402 1uf ck5105ak7r 0402 c106 cap cer 10uf 6.3v 20% x5r 0402 10uf ckc106ak6t 0402 c120 cap cer 10uf 6.3v 20% x5r 0402 10uf ckc106ak6t 0402 c124 cap cer 10uf 6.3v 20% x5r 04...

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    St-2112c sm r 1.2 smartrunk systems, inc. 48 r50 res 10k ohm 1/16w 5% 0402 smd 10k rcy041034z 0402 r55 res 10k ohm 1/16w 5% 0402 smd 10k rcy041034z 0402 r59 res 10k ohm 1/16w 5% 0402 smd 10k rcy041034z 0402 r60 res 10k ohm 1/16w 5% 0402 smd 10k rcy041034z 0402 r61 res 10k ohm 1/16w 5% 0402 smd 10k r...

  • Page 49

    St-2112c sm r 1.2 smartrunk systems, inc. 49 r85 res 1.0k ohm 1/16w 5% 0402 smd 1k rcy041024z 0402 r86 res 1.0k ohm 1/16w 5% 0402 smd 1k rcy041024z 0402 r97 res 1.0k ohm 1/16w 5% 0402 smd 1k rcy041024z 0402 r100 res 1.0k ohm 1/16w 5% 0402 smd 1k rcy041024z 0402 r111 res 1.0k ohm 1/16w 5% 0402 smd 1k...

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    St-2112c sm r 1.2 smartrunk systems, inc. 50 r21 res 47 ohm 1/16w 5% 0402 smd 47 rcy044704z 0402 r40 res 47 ohm 1/16w 5% 0402 smd 47 rcy044704z 0402 r79 res 47 ohm 1/16w 5% 0402 smd 47 rcy044704z 0402 r117 res 47 ohm 1/16w 5% 0402 smd 47 rcy044704z 0402 r22 res 2.2k ohm 1/16w 5% 0402 smd 2k2 rcy0422...

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    St-2112c sm r 1.2 smartrunk systems, inc. 51 r127 res 2.2 ohm 1/16w 5% 0603 smd 2.2 rcy062294z 0603 sw4 push sw sw key-ym061 ewps33083x u1 single chip radio transceiver rda1846 ynrd01846z u2 operational amplifier mcp6241u ynmr6241ut u12 operational amplifier mcp6241u ynmr6241ut u3 ldo linear regulat...

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    St-2112c sm r 1.2 smartrunk systems, inc. 52 20 st-2112 keyboard & display bom item qty description smtk pn 1 1 key pcb epl211030z 2 2 resistor 0 ohm (0402) rcy040004z 3 1 resistor 10 ohm (0402) rcy041004z 4 4 resistor 330 ohm (0402) rcy043314z 5 1 resistor 200 ohm (0402) rcy042014z 6 9 resistor 1k ...

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    21 accessory port: in the side of the radio, you will find four connectors: 1 – usb: usb 2.0 compliance 2 – external mic, external ptt and rx serial data (2.5mm) 4 3 2 1 mic (-) rx serial (ttl) mic (+)/ptt.

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    St-2112c sm r 1.2 smartrunk systems, inc. 54 3 – external speaker, tx serial data (3.5mm) 4 – accessory port pin function comments gnd ground main radio gnd sda high speed serial data i/o 0-3v up to 400khz scl high speed serial clock 0-3v up to 400khz i/o 3 digital input/output 1k ohm, 0-3.3v i/o 2 ...

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    St-2112c sm r 1.2 smartrunk systems, inc. 55 22 st-2112 service manual revisions author release date remarks daniel martin 1.0 jun-2013 initial release version daniel martin 1.1 jun-2013 added software zone specification copyright 2014 printed in malaysia www.Smartrunk.Com st-2112c sm r1.2.