4 DSP
Figure 4-6 Results of Amplitude and Frequency Analysis of the Digital IF Filter (CW Mode)
0 Hz in the center that corresponds to the pitch frequency
4.3.2 Types of Digital IF Filters
The following table provides possible choices of the filters and the default value (shown in bold) for respective modes.
| LOW CUT | 0 Hz, 50 Hz, 100 Hz, 200 Hz, 300 Hz, 400 Hz, 500 Hz, 600 Hz, 700 Hz, | |
| 800 Hz, 900 Hz, 1000 Hz | ||
SSB Mode |
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HI CUT | 1.0 kHz, 1.2 kHz, 1.4 kHz, 1.6 kHz, 1.8 kHz, 2.0 kHz, 2.2 kHz, 2.4 kHz, | ||
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| 2.6 kHz, 2.8 kHz, 3.0 kHz, 3.4 kHz, 4.0 kHz, 5.0 kHz | ||
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| WIDTH | 50 Hz, 80 Hz, 100 Hz, 150 Hz, 200 Hz, 250 Hz, 300 Hz, 400 Hz, 500 Hz, | |
CW Mode | 600 Hz, 1000 Hz, 1500 Hz, 2000 Hz, 2500 Hz | ||
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| SHIFT | Between 300 Hz and 1 kHz (in steps of 50 Hz), default value 800 Hz | |
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| WIDTH | 50 Hz, 80 Hz, 100 Hz, 150 Hz, 200 Hz, 250 Hz, 300 Hz, 400 Hz, 500 Hz, | |
| 600 Hz, 1000 Hz, 1500 Hz, 2000 Hz, 2500 Hz | ||
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SHIFT | 1000 Hz, 1100 Hz, 1200 Hz, 1300 Hz, 1400 Hz, 1500 Hz, 1600 Hz, | ||
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| 1700 Hz, 1800 Hz, 1900 Hz, 2000 Hz, 2100 Hz, 2210 Hz | ||
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AM mode (LOW CUT | LOW CUT | 0 Hz, 100 Hz, 200 Hz, 300 Hz | |
filters are AF filters) | HI CUT | 2.5 kHz, 3.0 kHz, 4.0 kHz, 5.0 kHz | |
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FSK Mode | WIDTH | 250 Hz, 500 Hz, 1000 Hz, 1500 Hz | |
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| LOW CUT | 0 Hz, 50 Hz, 100 Hz, 200 Hz, 300 Hz, 400 Hz, 500 Hz, 600 Hz, 700 Hz, | |
| 800 Hz, 900 Hz, 1000 Hz | ||
FM mode (AF filters) |
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HI CUT | 1.0 kHz, 1.2 kHz, 1.4 kHz, 1.6 kHz, 1.8 kHz, 2.0 kHz, 2.2 kHz, 2.4 kHz, | ||
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| 2.6 kHz, 2.8 kHz, 3.0 kHz, 3.4 kHz, 4.0 kHz, 5.0 kHz | ||
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