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ICOM IC-240

ICOM IC-22 and IC-240 HAM-Radio


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Software for Icom



Block Diagram B-200D PLL Board

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

B-200D Oscillator and PLL-Board Schematic

B-200D Oscillator and PLL PCB

Component Layout PLL Unit

B-200D PLL-board
AdjustmentDescriptionFrequency
C2PLL Reference Oscillator12.800MHzFrequency Counter to CP
C38Mixer Oscillator43.575MHzLoopMixing frequency

IC-240 PLL-board
AdjustmentDescriptionFrequency
C2PLL Reference Oscillator6.400MHzFrequency Counter to CP
C38Mixer Oscillator43.900MHzLoopMixing frequency

IC-22 PLL-board
AdjustmentDescriptionFrequency
C2PLL Reference Oscillator7.680MHzFrequency Counter to CP
C38Mixer Oscillator44.563 333MHzLoopMixing frequency

Main Board

Analaog Board

COMPONENTS

TC5080P Programmable Divider
TC5081P PLL Phase-Locked-Loop
TC5082P Oscillator and Reference Divider
uPC577H Balanced RF Amplifier
LM3028BH Balanced RF Amplifier
2SC2094 Finale Transistor