Section 7: i
6881091C63-F
Section 7: Low Band Service Information
Table of Contents
Chapter 1 Model Charts and Technical Specifications
1.0 Low Band Range 1 (29.7–36 MHz) Model Charts ............................................7:1-1
1.1 CDM Series Model Chart ............................................................................7:1-1
1.2 PRO Series Model Chart.............................................................................7:1-1
2.0 Low Band Range 2 (36–42 MHz) Model Charts ...............................................7:1-2
2.1 CDM Series Model Chart.............................................................................7:1-2
2.2 PRO Series Model Chart.............................................................................7:1-2
3.0 Low Band Range 3 (42–50 MHz) Model Charts ...............................................7:1-3
3.1 CDM Series Model Chart.............................................................................7:1-3
3.2 PRO Series Model Chart.............................................................................7:1-3
4.0 Technical Specifications ...................................................................................7:1-4
Chapter 2 Theory of Operation
1.0 Introduction .......................................................................................................7:2-1
2.0 Low Band Receiver Front-End..........................................................................7:2-1
2.1 Receiver Front-End .....................................................................................7:2-1
2.2 Front-End Bandpass Filters and Pre-Amplifier............................................7:2-2
2.3 First Mixer and High Intermediate Frequency (IF).......................................7:2-2
2.4 High Intermediate Frequency (IF) and Blanker Switches............................7:2-2
2.5 Low Intermediate Frequency (IF) and Receiver Back-End..........................7:2-3
2.6 “Extender” (Noise Blanker)..........................................................................7:2-3
3.0 Low Band Transmitter Power Amplifier (PA) 60 W...........................................7:2-4
3.1 Power Controlled Stage...............................................................................7:2-4
3.2 Driver Stage.................................................................................................7:2-5
3.3 Final Stage ..................................................................................................7:2-5
3.4 Antenna Switch............................................................................................7:2-5
3.5 Harmonic Filter ............................................................................................7:2-5
3.6 Power Control..............................................................................................7:2-6
3.7 TX Safety Switch .........................................................................................7:2-6
4.0 Low Band Frequency Synthesis .......................................................................7:2-7
4.1 Fractional-N Synthesizer .............................................................................7:2-7
4.2 Voltage Controlled Oscillator (VCO) and Buffers ........................................7:2-8
4.3 Synthesizer Operation.................................................................................7:2-9
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