开云体育

When @edy555 designed it and in Japan it was possible for others to build it in kit form, then in 2017 a description of the structure was made. At the end of this description is a list of known but unresolved issues.
The first was to not use 3.7V LiPo, but the product was redesigned at this point and made in large quantities.
see: /g/nanovna-users/attachment/484/0/NanoVNA%20alpha1%20kit%20assembly%20manual%20_v1.2%20translated_.pdf

73, Gyula