Motorola Cm Radio Midband 66 88mhz Information Manual
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Commercial SeriesCM Radios Midband (66-88MHz) 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 CM340/CM360 Model Chart ................................................................................ 1-1 2.0 Technical Specifications ...................................................................................... 1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction .......................................................................................................... 2-1 2.0 Midband (66-88MHz) Receiver...
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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 CM340/CM360 Model Chart CM Series Midband 66-88 MHz Model Description MDM50FNC9AN2_NCM340 66-88 MHz 1-25W 10-Ch MDM50FNF9AN2_N CM360 66-88 MHz 1-25W 100-Ch Item Description X FUC1601_ S. Tanapa Midband 25W 10 Ch BNC XFUC1603_S. Tanapa Midband 25W 100 Ch BNC X FCN6288_ Control Head XFCN5523_Control Head X X HKN4137_ Battery Power Cable XXHMN3596_Compact Microphone XXGLN7324_ Low Profile Trunnion XX6866546D02_RTTE Leaflet XX 6866537D37_ Safety...
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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 Midband Frequency Range:66-88 MHz Frequency Stability (-30°C to +60°C, 25°C Ref.)±5 PPM Channel Capacity:CM340 - 10 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 Temperature-30 to 60 o...
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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 Midband Frequency Stability: +/- 5ppm Modulation Limiting:±2.5 kHz @ 12.5 kHz ±4.0 kHz @ 20 kHz ±5.0 kHz @ 20/25 kHz Current Drain Transmit: 8A (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 Midband 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 Midband (66-88MHz) Receiver 2.1 Receiver Front-End The received signal from the antenna connector is filtered by the harmonic filter (common to both receive and transmit) and routed to the front end via the antenna...
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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 (U2) at pin 1. The first IF signal at 21.4 MHz mixes with the second local oscillator (LO) at 20.945 MHz to produce the second IF at 455 kHz. The second LO uses the external crystal Y2. The second IF signal is amplified and filtered by two external ceramic filters (FL4/FL3 for 12.5KHz channel spacing and FL5/FL2 for 25KHz channel spacing). The IF...