NanoVNA-H version 3.6.1 uses a screen driven by the ST7789 driver, therefore it requires new firmware.
The VCO frequency range of the SMC5351A is close to that of the MS5351M, so you can select MS5351 in the mode. The use of SMC5351A instead of MS5351M is because the SMC5351A has excellent consistency, and almost all SMC5351As can stably output 300MHz, whereas many MS5351Ms cannot operate at 300MHz. Therefore, when producing NanoVNA-H with MS5351M, we must perform screening to meet our requirements. Since 300MHz is an application beyond the manual range, we chose to use the more suitable SMC5351A after testing to replace the Si5351 and MS5351M. The power consumption of the SMC5351A and SI5351A is lower than that of the MS5351M. In addition, the phase noise of the SMC5351A at the IF offset where NanoVNA needs to be used is also the best, but the phase noise of the SMC5351A at other offsets may be very poor. If you need to use the SMC5351A to create other applications, you will need to re-evaluate the phase noise.
