On Tue, Dec 17, 2019 at 05:20 AM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:
With a well written specification, following closely the format of a major VNA manufacturer like Keysight, some users would be in a position to determine if the specifications are poorer. Then poor sellers would soon get a bad reputation.
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In my opinion the vast majority of hobbyists that the NanoVNA-H are targeted to are primarily concerned with frequency range, return loss, and thru loss specifications. Manufacturers of these hobbyist devices have limited resources. Detailed specifications as produced by a major manufacturer such as Keysight are probably best left to the community of open source users who in a lot of cases have better equipment and know-how to produce these specifications.
The NanoVNA-H has a track record of publicly releasing its schematics and frequently releasing firmware updates in response to user feedback. The NanoVNA-F, which has been out for a while now, has chosen not to publicly release its schematics, has not had any significant firmware upgrades since its release, and has only a quick start guide for documentation. Yet the owners of the NanoVNA-F seem willing to overlook these drawbacks because of larger display size and other considerations, such as metal case and easier firmware upgrade. That is a good example of what specifications are really important to the majority of buyers of these low cost VNA's.
- Herb
