QRP EFHW (unun with Winder 2643625002)

• With winder integrated, the total weight is about 200g when using 20AWG wires, it can easily fit your pocket.
• The ferrite 2643625002, according to MM0OPX's test, can reach almost 90% efficiency from 1.8Mhz to 28Mhz
• With compensation coil you can bring down the resonate point of 15m/10m band to commonly used frequencies.

For assembly guide, visit my blog: https://blog.edward-p.xyz/hamradio/2025/06/assembly/

Sorry for Chinese only, but mostly pictures, should be fine :）

Have fun, and 73!