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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

+1 It could be either the jack (center hole is a bit too big) or the pin (too small). You can get the former by not being careful when mating (at a bit of an angle) or if the center conductor is

It may be a "rocking" SMA connector on the board. However, another problem I've experienced with connectors and adaptors from China is tolerance on the center pin. I've run into the situation where

Mike, Thanks. Great thought - but I'm trying to measure a J-Pole so it has 0 ohms DC resistance between center conductor and shield. Some new information. I played some with it again this morning.

Hi Jerry, did you short out the antenna prior to connecting the Nano ? Static buildup will destroy the front end of the Nano. Just a thought. 73 Mike N7ATC

Arie, Thanks for the response. Yes, I've had this for a while but used it little. I don't guarantee the problem here isn't between the ears :) I thought about bad connections but unless it's the S11

Hi Jerry, If you own the nano for a long time, you probably know the ropes and tricks of calabration and such. If I would have the readings you show here, I would suspect a loose connection or some

Dave, Thanks but I did the cal on the unit, not the laptop. And the results on the unit are very similar to that on the laptop. Sorry I wasn't more clear on the process. Mea culpa. Jerry, Ai0K

The cal done on the native instrument is not used when you employ Saver on the PC or laptop. However, once you run the cal. using SAVER, you can store it on the PC or laptop for future use. The cal.

I should also add both the Nano VNA and Nanovna Saver are at the latest versions and it all worked fine with the same antenna last spring. Just trying to tune it a bit closer to optimum before winter

Hi, all, I've had a NanoVHA-H4 for about a year and a half now but haven't used it that much so this could easily be a problem between the ears. I used it a couple of months ago to check a couple of

Hi John, I noticed you joined the forum September 1st. Please look over the forum's Wiki for lots of information on using the NanoVNA. You'll note that the very first item in the forum is a note on

This works only on my linux system, but here are the current binaries build from DiSlord's source: https://github.com/Ho-Ro/NanoVNA-D/blob/current_bin/NanoVNA-H_1.2.15.bin

It's probably not worth putting too much effort into the curve fitting algorithm below a few MHz because I think this is the region where the dielectric losses can begin to cause an increase in ESR

To amplify on my previous post, one application I have is routinely tuning an HF screwdriver antenna which I use on 80-10m. For this purpose, I so one 401 point calibration over that entire range, and

Sorry, ignore my bin and hex links, they are for the -H. Older devices do not have the SD card slot. Just follow my other hint and do: NANOVNA_F303=1 make and flash the bin file ch/*.bin

OK I have DFU File Manager but can you explain what noSD in your file name means? I have and SD card in my NanoVNA-H4. Mike

Using Excel for curve fitting is a good start, but you need to specify a mathematical curve equation to get the ball rolling. The graphing function of Excel can provide an idea of whether the relation