Equations:
Compute the modulation pre-scaler divider:
S
=
k
F
(truncated to integer value 1)
Compute the number of points for the modulation waveform length:
P
=
2 x C
(1 + S) x F
(rounded down to even number)
Waveshapes are automatically expanded or compressed to match length
“P” computed above and downloaded into modulation RAM.
Example: Assume that you need to phase-continuously frequency hop
between the following nine frequencies every 200
ms.
15.0 MHz, 1.001 MHz, 9.780 MHz, 12.375 MHz, 0.5695 MHz,
3.579 MHz, 0.8802 MHz, 0.6441 MHz, and 10.230 MHz.
Solution: Create a modulation arbitrary waveform that is precisely
sampled in
FM modulation.
F = 1 / (9 x 200
ms) = 555.555 Hz (modulation frequency)
Round down in sixth digit to get modulation frequency to set.
S = 624 / 555.555 = 1.1232 (truncate to 1)
P
=
2 x C
(1 + S) x F
(rounded down to even number)
7
Chapter 7 Tutorial
Modulation
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