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- SmarTrunk Systems
- Transceiver
- ST-3118D
- Service Manual
SmarTrunk Systems ST-3118D Service Manual
Summary of ST-3118D
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Vhf fm digital transceiver st-3118d (450mhz ~ 520mhz) service manual smartrunk systems, inc. St-3118d sm r1.1.
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St-3118d sm r 1.1 smartrunk systems, inc. 2 contents 1. Specifications: ............................................................................................................................... 5 2. St-3118 exploded view ............................................................................
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St-3118d sm r 1.1 smartrunk systems, inc. 3 5.6.2.1. High power level alignment ..................................................................................... 16 5.6.2.2. Mid power level alignment ...................................................................................... 17 5.6.2....
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St-3118d sm r 1.1 smartrunk systems, inc. 4 9. St-3118 front board schematic ............................................................................................... 33 10. Component locator .........................................................................................................
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4. - st-3118 rf description 4.1. Circuit configuration the receiver is a single receiver with built 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 voice from 0hz to 3500hz. Demodulated signals ar...
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St-3118d sm r 1.1 smartrunk systems, inc. 9 analyzes the expected signaling programmed on the current channel table. In case of not any additional signaling must be decoded, or the signal has been detected, the main processor (u13) asks to the audio processor (u12) to open the audio path, unmuting t...
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St-3118d sm r 1.1 smartrunk systems, inc. 10 and fed it to the audio power amplifier (u8). 4.3. Transmitter system 4.3.1. Analog tx signal the mic signal coming from the front connector, the external mic signal coming from the accessory connector or the output of the pwm filter and fed into an analo...
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St-3118d sm r 1.1 smartrunk systems, inc. 11 4.3.3. Drive and final amplifier stages final rf is amplified on q1 (2sc5226) adjusting the impedance, then filtered to be fed to q2 (2sc3357) then finally amplified by u3 (ra60h1317) up to 50 watts output power. The transmit signal then passes through fo...
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St-3118d sm r 1.1 smartrunk systems, inc. 12 5. St-3118 alignment 5.1. Introduction the st-3118 series is carefully aligned at the 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 compo...
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St-3118d sm r 1.1 smartrunk systems, inc. 13 is clearly isolated electrically from all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented. 5.3. Required test equipment rf signal generator with calibrated output level at 1 ghz ...
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St-3118d sm r 1.1 smartrunk systems, inc. 14 please be sure you turn the radio on before continue with this alignment procedure. 5.5. Main radio alignment before setup any parameter, run sdr programming software then select radio alignment from top bar menu. A complementary message will be displayed...
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St-3118d sm r 1.1 smartrunk systems, inc. 15 setup the test equipment as shown for transceiver alignment, apply 13.8v dc power to the transceiver. The rf parameters are typed on the alignment software to facilitate the alignment within all radio band avoiding special programming of the radio before ...
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St-3118d sm r 1.1 smartrunk systems, inc. 16 for power alignment, you can do a fine-tuning as per your desire frequency sub-band. The software lets you linearize the complete band dividing the complete band into five steps to let you focus into your frequency bands. Even when the software has alread...
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St-3118d sm r 1.1 smartrunk systems, inc. 17 5.6.2.2. Mid power level alignment repeat the same procedure to align high power, but select power medium level on the alignment menu. Figure 13: medium power level alignment 5.6.2.3. Low power level alignment repeat the same procedure to align high power...
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St-3118d sm r 1.1 smartrunk systems, inc. 18 5.6.4. Modulation gain alignment: this is a critical parameter, which may not be realigned to different values other than factory default. Lower gain means a very high microphone gain must be assigned to get the proper radio voice deviation, and higher ga...
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St-3118d sm r 1.1 smartrunk systems, inc. 19 as soon the desired value is reached, press [finish] to store the value on radio memory. If you want to retrieve factory default, press [factory] instead of [start]. You will be asked to confirm the factory default alignment, and then if you confirm it, o...
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St-3118d sm r 1.1 smartrunk systems, inc. 20 reference tone for alignment proposes. As soon the desired value is reached, press [finish] to store the value on radio memory. Default value correspond to 1.8khz deviation for narrow band channels. If you want to retrieve factory default, press [factory]...
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St-3118d sm r 1.1 smartrunk systems, inc. 21 press start then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation. Radio will generate 134.4hz audio tone for alignment proposes. As soon the desired value...
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St-3118d sm r 1.1 smartrunk systems, inc. 22 press [start] then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation. Radio will generate a 1000hz alignment reference tone for alignment proposes. As soon ...
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St-3118d sm r 1.1 smartrunk systems, inc. 23 5.7. Receiver alignment setup the test equipment as shown for receiver alignment, apply 13.8 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 a...
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St-3118d sm r 1.1 smartrunk systems, inc. 24 6. 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-3118d sm r 1.1 smartrunk systems, inc. 25 6.1.2. Analog external mic gain: it aligns external microphone accessory port) sensitivity. Default factory value is 0.0db. Figure 29: external microphone sensitivity alignment alignment step is 3.2db. For noisy environments or when voice encryption is us...
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St-3118d sm r 1.1 smartrunk systems, inc. 26 gain on the mic gain then check the digital acg check box. For example, if you want a dynamic gain which causes the same effect that a gain of 15.0db when the voice on the microphone causes 50mv rms in the microphone switch output (standard voice at 4 inc...
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St-3118d sm r 1.1 smartrunk systems, inc. 27 6.1.7. Disable rf power use this box to check when you do not want to use the rf power amplifier. It is commonly used for dealers to make a demonstration of the radio features without interfering to any other existing user in the frequency or for operatio...
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St-3118d sm r 1.1 smartrunk systems, inc. 28 7. Radio appearance alignment under user mode, login radio appearance can be aligned. Select edit then appearance from radio top toolbars to access to the appearance screen: figure 33: access to the appearance menu a soon as appearance option is selected,...
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St-3118d sm r 1.1 smartrunk systems, inc. 29 second folder on appearance screen allows the user to adjust the tones, which are played back in any event. Tones can be changed by the dealer. Please refer to appendix ii to learn about it. Check key ptt if you want to play back a key tone acknowledge an...
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St-3118d sm r 1.1 smartrunk systems, inc. 30 status: powered on, powered off, fix, etc. Check rssi if you want the radio plays a concerning message back any time you ask for current rssi. Press ok once you finish setting all desired messages. This feature will be stored into the file then it will be...
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St-3118d sm r 1.1 smartrunk systems, inc. 31 notes:.
Page 30: Fcc Notices
Fcc notices federal communications commission interference statement this equipment has been tested and found to comply with the limits for a class b digital device, pursuant to part 15 of the fcc rules. These limits are designed to provide reasonable protection against harmful interference in a res...