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
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
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