In true Chinese style, downgrade knock offs of Arduino boards (eg the Arduino nano) have appeared, the downgrade is achieved by use of CH340 USB to RS-232 converters instead of the FTDI chips on the genuine nano. Information is scarce as their website is mostly in Chinese language.ĬH34x chips have become more common, perhaps as consumers have fled the Chinese Prolific product line (for good reason). One of the several sources of chips for USB to RS-232 converters is WCH, a Chinese firm offering their CH340 and CH341 chipsets. Resolve measurement of I1, I2 and I12 into Ic and Id.Loop in ground (LiG) for rx only on low HF – #8 measurement and observation.Choosing a ferrite mix for a 160m unun rationally.A mid life kicker for the 2500VA 230V 50Hz genset.Loop in ground (LiG) for rx only on low HF – #10 SND comparison with LoG.
The oft asked question of how much an LNA improves a 70cm weak signal station – Rules of Thumb.On testing two wire line loss with an analyser / VNA – part 4.Loop in ground (LiG) for rx only on low HF – #11 three terminal equivalent Z.The Smith chart, a thing of beauty… and great utility.
NanoVNA-H4 – a ferrite cored test inductor impedance measurement – s11 reflection vs s21 series vs s21 pi.The Smith chart, a thing of beauty… and great utility #2.On testing two wire line loss with an analyser / VNA – part 5.InsertionVSWR of Chinese 1-9 balun module.InsertionVSWR of Chinese 1-9 balun module – that load resistor.On testing two wire line loss with an analyser / VNA – part 6.NanoVNA-H4 v4.3 – improving the SD card slot.NanoVNA-H4 v4.3 – broken SMA connector.A 1:4 RF transformer for measurements – based on Noelec 1:9 balun assembly.ESP8266 relay module review – Yunshan WiFi relay – a new life.InsertionVSWR of Chinese 1:9 balun module #2.InsertionVSWR of Chinese 1:9 balun module #3 – correcting Z using e-delay.NanoVNA-App – driver for NanoVNA firmware updates.NanoVNA-H4 – inductor challenge -part 1.NanoVNA-H4 – inductor challenge – part 2.NanoVNA-H4 – inductor challenge – part 3.NanoVNA-H4 – inductor challenge – part 4.NanoVNA-H4 – inductor challenge – part 5.Ferrite cored RF chokes in Class-E RF power amplifiers.NanoVNA-H4 – inductor challenge – part 6.Ferrite cored RF chokes in Class-E RF power amplifiers – core material issues.NanoVNA – trying the DiSlord built in cable length measurement feature.