Recently I knew ATS-25+ AIR at YOUTUBE. There is the HIZ-AIR unit of the option for the current ATS-25. Also ATS-25+ AIR may be combined the HIT-AIR with ATS-25. I'm muh interedted in HIZ-AIR inside. 最近YOUTTUBEでATS-25+ AIRが紹介されてい…

You shall wind the front end filter coils for R909-DSP1. There are two examples, as the one is the stagger type and the other is the 3 stages Chebyshev style. You shall wind two coils of one kind for the stagger type and three coils of two…

I will introduce how to combine the degital VFO with the Chinese airband receiver kit. The tiny R909-VFO is suitable for remodeling the kit to incorporate the digital LO. If you would like to know more information in English, please visit …