![]() ![]() The easiest to test was U111 but I chose to test U4 first which responsible for 3V, probably for the mixers.Ī few minutes later the power regulator was lifted from the board and the short was gone. Looking again in the schematic yielded a list of potential culprits. ![]() Simple continuity test confirmed that the 5V rail was shorted to ground. So I pulled my multimeter and started probing different voltages.Įverything was OK on battery management chip but when checking the 5V rail, I noticed that the it’s dropping significantly when turning the device on. ![]() Taking a look on the schematic I saw that it’s not very complex design. What great about the NanoVNA project is that it’s open source so I could find the files online. I tried everything, disconnecting the battery, connecting the USB, asking the NanoVNA group but couldn’t solve the issue. The red LEDs just flashed and nothing happened. The package arrived after 20 days via DHL and I started playing with it, measuring different antennas and learning how to operate the device.īut, in the next morning it refused to work. I decided to wait a month, just to see where the wind blows.Īfter waiting, I found that there’s an improved version called NanoVNA V2 (Or S-A-A-2) with larger frequency range and more reliable design. Turned out that the Hong Kong post had issues delivering in the pandemic so they sent it back to the seller. The nice representative, Maggie, told me that my NanoVNA was shipped but after a few days I saw on the tracking website that it was heading back to the seller. Hugen is selling on Alibaba so I found his store and ordered one. ![]() The main goal was to have a device that will give a little bit more information than my MFJ SWR meter.Īfter talking to a fellow ham and doing some research online I decided to buy the NanoVNA made buy Hugen. In early March I decided to buy the NanoVNA, a small lightweight Vector Network Analyzer. ![]()
0 Comments
Leave a Reply. |