Metrics
Sensitivity: -123 dBm (continuous tone for 10 seconds) (vibration is not continuous)
If the separation interval is less than 400 Hz, use an average frequency of 200 Hz.
Field strength indicator(RSSI)Accuracy
< -110 dBm ... +1/-7 dB
... ±0 dB at -110 to -34 dBm
> -34 dBm ... - 0/+∞ dB (saturated)
Adjacent frequency suppression: Suppress by 30 dB when the absolute value exceeds 2 kHz.
Time taken for CIC to be established (sum of all steps) 27ms
Allow CW rate of 40 WPM
Principle
Using the SI4463 chip (product library uploaded), STM32F103 as the main controller.
Using the four sub-carriers of 4FSK, each sub-carrier corresponds to a frequency, and by reading the data packets, you can decode the CW frequency.
Test video
[Homemade linear satellite transceiver, reception part debugging] https://www.bilibili.com/video/BV1hjbX6VE9w/?share_source=copy_web&vd_source = 4669ce004a77435c01a0f38927f44d18
Test image
Additionally, I would appreciate feedback on the GUI. If you have any suggestions or comments, please let me know, and I will do my best to make changes to the code.
Cost
The cost of producing individually is approximately 400 yuan, while the cost of bulk production is approximately 250 yuan, which represents a significant cost saving.
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