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Yeah, thinking about it, you don't want any type of organic material around high freq circuits. (I remember in Jr High, we used weak muriatic acid as a flux when soldering sheet metal.....really low

If the flux is water soluble it definitely must be cleaned off or it will corrode the board. I worked for a company that partially built their boards to be finished later and they used water soluble

Thanks Bart. I figured the battery was wedged in there - probably why the SD card slot wasn't installed.

I have worked in this industry for long enough to know it does make a difference. The flux attracts moisture and can change parameters. I always use IPA (not the beer) to clean the board off. Be

That is the one I have, and it seem to work OK

See attached screen shot. I purchased my white gecko from 2012moon816. It included the battery.

A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless. Brass shim should work for the shields, but make sure it's not too

Larry, Sadly no HT's here but I am guessing some brass shim etc or tin plate screens would help. Still not convinced about the top end freq wise though with SA602. The unit wasn't that expensive so

I've already started hacking my unit so I can push F/W, add a battery, etc. I've attached several photos. If you're into Amateur Radio, you can probably obtain some old scrap Motorola HT1250

Larry, I can understand the airline battery conflicts definitely as I fly with Radios from time to time. If it were just the battery that were missing maybe but that is not all that doesn't work and

Dom, There are VERY strict guidelines as to what types of equipment can include Lithium batteries if being shipped by air. Many Asian vendors have been burned by having their shipments returned due to

Dom, Can you be more specific? What's missing from the Gecko version and how is it a "very bad clone"? What are the hardware and/or software differences? It would be great if someone could create

No battery and lots of 'other bits' seem missing.

Have you included or documented all the additional changes anywhere? Is the source code available for the additions? 72 Dom M1KTA

I found that the white version with a gecko on it was a very bad clone. I would agree. As I have one and there is lots missing :-) 72 DomM1KTA

I remade NanoVNA based on edy555 (https://twitter.com/edy555), but modified some circuits, added battery management circuits, and redesigned the PCB. I developed a PC control software can export

I was able to get v 1.02 working yesterday I did have a couple of hiccups, but go tit working. Thanks for you help. Not being a SW person, I'm lost if it doesn't work . I'm really impressed with the

Fixed the bug that nanovnasharp cannot work properly under a system such as French use "," to separate decimals.

What SW, and what bug? Frank