Well, first of all, Linux is only one OS out there, so it is not really a great reference. There are many other OS's out there, several of which I've worked on, from embedded systems to mainframes. Bu

Tim, I've worked on multiple APIs in the 50+ years I've been programming (including as an IBM employee) on everything from MS-DOS 1.0 to mainframe operating systems like MVS. Yes, few applications int

Rick, That's true to a certain point. However, the API is just an interface to the kernel and must be compatible with the kernel. Changes in the kernel often require changes in the API. Perhaps not in

Peter, It looks like you have an older version of the kernel, which could explain why you can download it and I can't. 73, Jerry, AI0K

`That's interesting, Peter. I couldn't get it on my Samsung S23 Ultra. My kernel version is 5.15.148 from December 3rd (it just updated itself recently. I wonder if that's the problem. 73, Jerry, AI0K

I suspect it's a setting in the Google Play Store. I'm downloading it form the US store; perhaps the European store has a different setting. Jerry, AI0K

I get the same message. Android 14.

One thing you might try - most cell phone cameras will see down into the near infrared (I can see the flashes from my TV remote on my camera). You could try that. I would recommend doing it in a dark

There was an article in QST around 50 years ago about a wide band 80 meter dipole. It was constructed just like this something like 8 wires separated by around 6" with spreaders (similar to homebrew l

You can say the coil just added 1/8 wavelength but it's not a radiating element of the antenna. Its actual purpose is to convert the impedance from a+bj to 50+0j ohms. The antenna itself is still not

I disagree here. One of the most popular vhf/uhf mobile antennas (at least on this side of the pond) is the 5/8 wave antenna. It's not resonant but it has a low angle of radiation so it's more effecti

Does this one support Dislord's firmware updates? I have an H4 but I'm thinking of getting another one as a spare. They're cheap enough and that gives me one I can loan out. Or, if I drop it it's no b

Here's another item I got in my email. It's a boot camp especially good for those just learning how to use a VNA but experienced users should get something out of it, too. https://coppermountaintech.c

It might be easier to remember that the chart on the NanoVNAi is basically a stack of paper charts (transparencies would be better), each with a slightly different frequency being displayed. Static ch

Hi, all, I got a reference to this in my email today. It's a great description of how a Smith Chart works and how to use it for various measurements. If you're not familiar with complex numbers as app

It's looking more like a heat problem. I shut it off for a while and tried again - not changing anything (even the pigtail with the load was still connected). The 440-450 scan worked perfectly. The 14

It's beginning to look like I have a heat problem here. I finally got some time to spend on it this morning. I plugged the calibration units directly into the CH0 and calibrated 143.5-148.5Mhz and 435

I took the cover off today. The SMA connector is solidly soldered to the top of the board. However, it also looks like its pins go through the board and may be soldered on the back side. But there's a

Hi, Jim, Yes, that's always possible even though I've been very careful in inserting into the jack - to the point I even use a female-male SMA adapter to protect the one on the NanoVNA. But that's no

Hi again, Dave, That's possible with the pigtails I have but I would think the open/short/load connectors that came with the device would work. Of course, there's always the other problem that one of