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Roman Piksaykin 2023-11-13 01:35:14 +03:00 zatwierdzone przez GitHub
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@ -6,8 +6,6 @@ necessary build files to build a custom application which turns pico into
precise PLL digital frequency oscillator of the portion of HF radio spectrum precise PLL digital frequency oscillator of the portion of HF radio spectrum
1.1 to 9.4MHz with high resolution. 1.1 to 9.4MHz with high resolution.
https://youtube.com/shorts/qe6UaCIKlow?feature=share
# Precise frequency resolution # Precise frequency resolution
The library provides 1 Hz frequency resolution in initialize function. This The library provides 1 Hz frequency resolution in initialize function. This
resolution can be easily increased to 23 millihertz, which is limited by resolution can be easily increased to 23 millihertz, which is limited by
@ -35,6 +33,10 @@ Owing to the meager frequency step, it is possible to use 3, 5, or 7th harmonics
of generated frequency. The practical resolution will be quite the same - far of generated frequency. The practical resolution will be quite the same - far
below 1 Hz. Such solution completely cover all HF and low band up to 65.8 MHz. below 1 Hz. Such solution completely cover all HF and low band up to 65.8 MHz.
# Tests of RF spectrum quality
Sweep (5Hz step, carrier is 9.4MHz) test: https://youtu.be/nYC1VDBiz4o
Pseudorandom MFSK (5Hz step, carrier is 9.4MHz) test: https://www.youtube.com/shorts/CEPW8hwlG7k
# For what? # For what?
This is an experimental project of amateur radio hobby and it is devised by me This is an experimental project of amateur radio hobby and it is devised by me
in order to experiment with QRP narrowband digital modes. in order to experiment with QRP narrowband digital modes.