| General > General Technical Chat |
| Why do so many people here go nuts over very low quality gear from China? |
| << < (27/35) > >> |
| BravoV:
As its too often seeing the blame that China is evil and culprits for all your problems, why don't start campaign like electing your political representative, that promise once elected will start border control to ban all Chinese import, starting like from your spoon, your underpant and etc, up to gadgets like VNA ::), and demand everything must be manufactured locally or within region or allies. Or its just a matter of convenient just put blame and escape-goating everything on Chinese ? :-// |
| jklasdf:
There are other VNA projects that were significantly more expensive than the nanoVNA, but still successful. For instance the xaVNA, see https://www.kickstarter.com/projects/1759352588/xavna-a-full-featured-low-cost-two-port-vna and https://xaxaxa-dev.com/xavna.cppsp This was a >$200 USD instrument that was posted here on eevblog and successfully funded on kickstarter, and units shipped. Jadew's product is a bit more of a stretch though, since basically the only people that would be interested are those that already own a "real" spectrum analyzer and actually need better scalar network analysis performance and (more importantly) are willing to pay for it. Other people have already commented on this, but it's no surprise that the market for "real" (i.e. much more expensive) test equipment is smaller. Buying a fixable used vector network analyzer for $200 is fairly rare, I don't think many people would actually be able to just go out and find one for that cheap right now. Overall, although jadew has some points (i.e. the post isn't as bad say treez), it would've been nice to know about the tracking generator project in the first post...I can't honestly make myself believe this question was asked in good faith. |
| tautech:
--- Quote from: jklasdf on December 22, 2019, 09:05:22 am --- Overall, although jadew has some points (i.e. the post isn't as bad say treez), it would've been nice to know about the tracking generator project in the first post...I can't honestly make myself believe this question was asked in good faith. --- End quote --- I can. When a product is claimed to be suitable to 1.5 GHz usage then the dozens of buyers of them here on EEVblog report they are quite accurate to 300 MHz but not beyond it would only seem fair that it was instead advertised as suitable for 300 MHz usage. |
| OwO:
Yes, the NanoVNA was originally intended as a 200MHz unit (si5351 is only specified to 200MHz, 300MHz is overclocking and some units can't go that high). I think it's very unlikely that aliexpress and taobao will do anything about it though because the units do actually reach 900MHz, just with bad accuracy that is not apparent with basic testing. I've mentioned the harmonic mode linearity issues before on the nanovna-users group, but as I have obvious vested interest in the GHz space it'll be up to other people to bring more attention to this issue. |
| ogden:
--- Quote from: james_s on December 22, 2019, 02:27:01 am ---I don't care who it's designed by or for or how much it costs, specs should not be deliberately exaggerated. --- End quote --- That's your problem that you don't care who's designed, buy cheap shit and then complain that specs are exaggerated. I am saying that big brands do not exaggregate specs because instruments are subject to calibration, in 3rd party labs. If you know what's calibration you will understand that cheating with specs in such case is dumb idea. |
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