Motorola Pr400 Detailed 6881096c25 B Manual
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VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)7-716881096C25-BJune, 2005 C157C121C158 C122C130 C132 C131 C135C133C134 C140 C136 C137 C141 D120 D121 L120L121 L130 L131 L132 L140 R120 R121 R150 R151U151 C102 C108 C109C110C116 C170 C155 C171 C100 C101 C103 C106 C111 C114 C120 C124 C150 C151 C152 C154 C159 C172 C104 C105C107 C115C123 C153 C156 L100 L101 L110 L102 L103 Q100 Q150 Q170 4 3 61 R107 R157R156R106 R103 R105 R100 R102 R101 R104R110 R111 R152 R153R154 R155 R158...
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7-72VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)June, 20056881096C25-B Component Side Solder SideD1 D2 D3 D4 D5 D6 D7 D8 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 C1 C2 C3 C4C5 C6 C7 C8 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 G1 G2 9 J1 281 g1 g2J2 43 Q1 4 3 Q24 3 Q3 4 3 Q44 3 Q5 43 Q6 4 3 Q74 3 Q8 4 3 Q9 4 3 Q10 4 3 Q11 4 3 Q12 R1 R2 R3R4 R5 R6 R7R8 R9 R10 R11 R12 R13R14R15R20 Figure 7-58. VHF (146-174 MHz) Keypad Board (8466565A03-B)
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VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)7-736881096C25-BJune, 2005VHF (146-174 MHz) Radio Parts List (8486769Z04-C)Circuit RefMotorola Par t No.DescriptionC1 2115153H41 CAP, 22pF C2 2115153H46 CAP, 36pF C3 2115153H49 CAP, 47pF C4 2115153H37 CAP, 15pF C5 2115153H14 CAP, 3pF C6 2115153H37 CAP, 15pF C7 2115153H45 CAP, 33pF C8 2115153H44 CAP, 30pF C9 Not_Placed - C20 2113945A09 CAP, 1000pF C22 2113945A09 CAP, 1000pF C23 2113945A09 CAP, 1000pF C24 Not_Placed -...
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7-74VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)June, 20056881096C25-BC410 2313960D07 CAP, 10uFC411 2113946K02 CAP, 100000pF C412 2113945A09 CAP, 1000pF C413 2113946K02 CAP, 100000pF C414 2113946K02 CAP, 100000pF C415 2113945A09 CAP, 1000pF C416 2113945A09 CAP, 1000pF C417 2113945A09 CAP, 1000pF C418 2113946K02 CAP, 100000pF C419 2113945A09 CAP, 1000pF C420 2113945B02 CAP, 10000pF C421 2113945B02 CAP, 10000pF C422 2113945B02 CAP, 10000pF C425 2113946E02 CAP, 1uF C426...
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VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)7-756881096C25-BJune, 2005R53 0613952R13 RES, 33KR54 0613952Q90 RES, 5100 R55 0613952Q61 RES, 330 R57 0613952Q89 RES, 4700 R60 0613952Q82 RES, 2400 R61 0613952R25 RES, 100K R62 0613952Q85 RES, 3300 R63 0613952R15 RES, 39K R64 0613952R08 RES, 20K R65 0613952R15 RES, 39K R66 0613952R08 RES, 20K R67 0613952R08 RES, 20K R72 0613952Q63 RES, 390 R73 0613952Q79 RES, 1800 R74 0613952Q75 RES, 1200 R75 0613952R03 RES, 12K R76 0613952Z55...
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7-76VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)June, 20056881096C25-B VHF (146-174 MHz) Keypad Board Parts List (8466565A03-B) T41 2515121H01 Balun Transformer T42 2515121H01 Balun Transformer U51 5115281H01 SA616 U52 5115070H01 TC7W04FU U110 0178034A01 PA Module U150 5114005A01 LM2904DR U151 2415954H01 INDCTR Bead U201 5185177Y01 AT25016 U251 5105750U56 VCO Buffer IC U310 5115746H01 Voltage Regulator U320 5115679H01 Voltage Regulator U330 5115745H01 Voltage Regulator...
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Chapter 8 403-440 MHz UHF Theory Of Operation 8.1 Introduction This chapter provides a detailed theory of operation for the radio components. Schematic diagrams for the circuits described in the following paragraphs are located in Chapter 12 of this manual. 8.2 UHF Receiver The UHF receiver covers the range of 403-440 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems. The receiver is divided into two major blocks, as shown in Figure 8-1. • Front End...
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June, 20056881096C25-B 8-2403-440 MHz UHF Theory Of Operation: UHF Receiver The output of the RF amplifier is applied to the interstage filter, a fixed-tuned 4-pole Butterworth shunt-coupled resonator design having a 3 dB bandwidth of 68 MHz centered at 462 MHz, and insertion loss of 3.5 dB. This filter yields an image rejection of 58 dB at 350 MHz, assisted by a transmission-zero at 300 MHz implemented by C524 for the reasons mentioned above. The output of the interstage filter is connected to the...
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6881096C25-BJune, 2005 403-440 MHz UHF Theory Of Operation: UHF Transmitter 8-3 8.3 UHF Transmitter The UHF transmitter covers the range of 403-440 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 8-2. • Power Amplifier • Harmonic Filter • Antenna Matching Network • Power Control. Figure 8-2....
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June, 20056881096C25-B 8-4403-440 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry 8.3.4 Antenna Matching Network The harmonic filter presents a 50Ω impedance to antenna jack J140. A matching network, made up of C140-C141 and L140, is used to match the antenna impedance to the harmonic filter. This optimizes the performance of the transmitter and receiver into the impedance presented by the antenna, significantly improving the antennas efficiency. 8.3.5 Power Control The power control...