Motorola Cm Radio Vhf2 Information Manual
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Commercial SeriesCM Radios VHF2 (146-174MHz) Service Information Issu e: December 2 003
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ii Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motorola computer programs stored in semiconductor memories or other media. Laws in the United States and other countries preserve for Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described...
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iii Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CM140/CM340/CM160/CM360 Model Chart ....................................................... 1-1 2.0 Technical Specifications ...................................................................................... 1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction .......................................................................................................... 2-1 2.0 VHF (146-174MHz)...
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iv 8.0 Transmit Signalling Circuits ............................................................................... 2-17 8.1 Sub-Audio Data (PL/DPL) ............................................................................ 2-17 8.2 High Speed Data .......................................................................................... 2-18 8.3 Dual Tone Multiple Frequency (DTMF) Data ............................................... 2-18 9.0 Receive Audio...
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Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CM140/CM340/CM160/CM360 Model Chart CM Series VHF2 146-174MHz Model Description MDM50KNC9AA2_NCM140 146-174 MHz 1-25W 8-Ch MDM50KNC9AN2_N CM340 146-174 MHz 1-25W 10-Ch MDM50KNF9AA2_NCM160 146-174 MHz 1-25W 64-Ch MDM50KNF9AN2_N CM360 146-174 MHz 1-25W 100-Ch Item Description X FUD1183_ S. Tanapa VHF2 25W 8 Ch BNC XPMUD1879_S. Tanapa VHF2 25W 10 Ch BNC X PMUD1874_ S. Tanapa VHF2 25W 64 Ch BNC XPMUD1881_S. Tanapa VHF2 25W 100 Ch BNC X X FCN6288_...
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1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS 2.0 Technical Specifications Data is specified for +25°C unless otherwise stated. General Specification VHF2 Frequency Range:146-174 MHz Frequency Stability (-30°C to +60°C, 25°C Ref.)±2 PPM Channel Capacity:CM140 - 8 CM340 - 10 CM160 - 64 CM360 - 100 Channel Spacing: 12.5/20/25 kHz Power Output:1-25W Power Supply: 13.2Vdc (10.8 - 15.6 Vdc) negative vehicle ground Dimensions (L X W X H)118mm X 169mm X 44mm Weight: Low power (1-25W) 1.02 Kg Operating...
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Technical Specifications1-3 *Availability subject to the laws and regulations of individual countries.Tr a n s m i t t e r Specification VHF2 Frequency Stability: +/- 2.5ppm Modulation Limiting:±2.5 kHz @ 12.5 kHz ±4.0 kHz @ 20 kHz ±5.0 kHz @ 20/25 kHz Current Drain Transmit: 7A (25W) FM Hum and Noise:-40 [email protected] kHz -45 dB@ 20/25 kHz Conducted/Radiated Emissions:-36 dBm < 1 GHz -30 dBm > 1 GHz Adjacent Channel Power-60dB @12.5, -70dB @ 20/25kHz Audio Response: ( 300 to 3000Hz)+1, -3dB Audio...
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1-4 MODEL CHART AND TECHNICAL SPECIFICATIONS
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Chapter 2 THEORY OF OPERATION 1.0 Introduction This Chapter provides a detailed theory of operation for the VHF circuits in the radio. Details of the theory of operation and trouble shooting for the the associated Controller circuits are included in this Section of the manual. 2.0 VHF (146-174MHz) Receiver 2.1 Receiver Front-End The received signal is applied to the radio’s antenna input connector and routed through the harmonic filter and antenna switch. The insertion loss of the harmonic...
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2-2THEORY OF OPERATION 2.2 Receiver Back End The IF signal from the crystal filter enters the IF amplifier which provides 20 dB of gain and feeds the IF IC at pin 1. The first IF signal at 44.85 MHz mixes with the second local oscillator (LO) at 44.395 MHz to produce the second IF at 455 kHz. The second LO uses the external crystal Y301. The second IF signal is amplified and filtered by two external ceramic filters (FL303/FL302 for 12.5KHz channel spacing and FL304/FL301 for 25KHz channel spacing)....