Motorola Cm Vhf1 136 162mhz Low Power Manual
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Commercial Series CM Radios VHF1 (136-162MHz) Low Power Service Information Issue: October 2004
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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 1MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CM140/CM30/CM160/CM360 Model Chart ......................................................... 1-1 2.0 Technical Specifications ...................................................................................... 1-2 Chapter 2THEORY OF OPERATION 1.0 Introduction .......................................................................................................... 2-1 2.0 VHF (136-162MHz)...
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iv 8.3 Dual Tone Multiple Frequency (DTMF) Data ............................................... 2-18 9.0 Receive Audio Circuits....................................................................................... 2-19 9.1 Squelch Detect ............................................................................................. 2-19 9.2 Audio Processing and Digital Volume Control.............................................. 2-20 9.3 Audio Amplification Speaker (+) Speaker (-)...
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Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 Model Chart (VHF1 136-162 MHz) CM Series VHF1 136-162MHz Model Description MDM50JNC9AA2_NCM140 136-162 MHz 1-25W 8-Ch MDM50JNF9AA2_N CM160 136-162 MHz 1-25W 64-Ch MDM50JNF9AN2_NCM360 136-162 MHz 1-25W 100-Ch Item Description X PMUD1936_ S. Tanapa VHF1 25W 8 Ch BNC XPMUD1940_S. Tanapa VHF1 25W 64 Ch BNC X PMUD1941_ S. Tanapa VHF1 25W 100 Ch BNC XFCN6288_Control Head X X FCN5523_ Control Head XXXHKN4137_Battery Power Cable XX XRMN5018_ HMN3596_Mag One...
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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 VHF1 Frequency Range:136-162 MHz Frequency Stability (-30°C to +60°C, 25°C Ref.)±2.5 PPM Channel Capacity:CM140 - 8 CM340 - 10 CM160 - 64 CM360 - 100 Channel Spacing: 12.5/20/25 kHz Power Supply:13.8 Vdc (11 Vdc - 16.6 Vdc) negative Vehicle ground Dimensions (L x W x H) 4.65” X 6.67” X 1.73” (118mm X 169.5mm X 44mm) Weight2.22 lbs (1.01 kg) FCC...
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Technical Specifications1-3 Transmitter Specification VHF1 Power Output1-25W Conducted/Radiated Emissions:-36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: (from 6 dB/ oct. Pre-Emphasis, 300 to 3000Hz) +1, -3dB Tx Audio Distortion < 3% Modulation Limiting:±2.5 kHz @ 12.5 kHz ±4.0 kHz @ 20 kHz ±5.0 kHz @ 25 kHz FM Hum and Noise: -40 [email protected] kHz -45 dB@25 kHz Receiver Specification VHF1 Sensitivity (12 dB SINAD):0.35 µV @ 12.5 kHz 0.3 µV @ 25 kHz Intermodulation: 65 [email protected] kHz 75 dB@25 kHz Adjacent...
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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 associated Controller circuits are included in this Section of the manual. 2.0 VHF (136-162MHz) 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 filter/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 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)....