ICOM IC-22 and IC-240 HAM-Radio

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Software for Icom

Block Diagram B-200D PLL Board

FrequencyStep = f_ref : 1024 = 12800000Hz : 1024 = 12500Hz
VCO_frequency = (f_LoopMixer x 3) + (N x FrequencyStep x 2)
VCO_frequency = (43,575MHz x 3) + (N x 12,5kHz x 2)
where N is 1 to 256.
For N = 1; VCO_frequency = (43,575MHz x 3) + (1 x 12,5kHz x 2) = 130,750MHz
For N = 256; VCO_frequency = (43,575MHz x 3) + (256 x 12,5kHz x 2) = 137,125MHz
Receive and Transmit frequency = VCO_frequency + 10,7MHz.

B-200D Oscillator and PLL-Board Schematic

B-200D Oscillator and PLL PCB

B-200D PLL-board

Adjustment	Description	Frequency
C2	PLL Reference Oscillator	12.800MHz	Frequency Counter to CP
C38	Mixer Oscillator	43.575MHz	LoopMixing frequency

IC-240 PLL-board

Adjustment	Description	Frequency
C2	PLL Reference Oscillator	6.400MHz	Frequency Counter to CP
C38	Mixer Oscillator	43.900MHz	LoopMixing frequency

IC-22 PLL-board

Adjustment	Description	Frequency
C2	PLL Reference Oscillator	7.680MHz	Frequency Counter to CP
C38	Mixer Oscillator	44.563 333MHz	LoopMixing frequency

Main Board

COMPONENTS

TC5080P Programmable DividerTC5081P PLL Phase-Locked-LoopTC5082P Oscillator and Reference DivideruPC577H Balanced RF AmplifierLM3028BH Balanced RF Amplifier2SC2094 Finale Transistor