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Thanks again. Details here: Loop spacing: 21.5mm Loop diameter (inner): 36mm Loop diameter (outer): 46mm 19 turns

Many thanks! I should have thought of that, hindsight 20:20, etc. -- Best Regards, Tom, VA7TA

You need update firmware on NanoVNA for work (nanoVNA-App need new format for data exchange)

Greetings, I decided to give NanoVNA-App a spin for the first time and I am impressed with the appearance of the GUI. But it runs OK with my TinySA but not with either of my nanoVNAs. My attempts to

Well, gentlemen......... ( um, and ladies) This might not be technically the correct forum. The frequency of discussion is above 3ghz, which is out of the range of all the nanovna devices which are

Send me the dimensions and I'll have a look. While it may have a good Return Loss at 3.4 GHz, that does notmean the radio waves are going out the front of the antenna!? hihi

Thanks for the reply, but what's confusing me is that, looking at the results of the VNA, this appears to be a 9cm antenna.

Hi Marco, your measured file looks like measured directly at the antenna. But running antenna with you rig, you need a cable with connectors. So take a look at that cable and connectors and make a

Hi, just received my nanoVNA H4 and after a few satisfactory tests, decided to use it to fix my 3 element 50Mhz yagi which presents a little too high SWR on FT8 frequency (50.313Mhz). The SWR reading

OK, having the first turn near the reflector is one technique to get a 50 Ohm match. ?You may try moving it a bit closer to the reflector while watching 2.4 GHz response.? Next is that boom???

Thanks for the reply, attached are some photos. Note this was sold in the UK as a 13cm antenna (I think by Sandpiper, but I may be wrong), many years ago. I've never actually built a helix design

Over the years I have tested over 100 Helix antennas on my antenna range,and only about 10% had forward gain and were circularly polarized. The Kraus formulas are overly optimistic and do not allow

Have been testing various antennas on my NanoVNA V2 Plus4 and in all but one, the results appear roughly as expected. The one that doesn't is a 2.4GHz helix, which shows a very poor match there and

"...you CANNOT brick the Nanovna..." Hold my beer!

Brent, Please browse the forum Wiki and Files sections. You will find PDFs and links to various User Guides that detail the flashing process and other neat stuff about the nanovna. plese remember -

Thanks, John. I thought it might be something like that. And I've learned a second thing from your reply, how to update the firmware. Is there a specific site or download I need to be connected to?

RESISTANCE IN YOUR COAXIAL CABLE STUB Your antenna has R = 0 Ω. The R+jX (Ω) chart allows for positive and negative R values. 1) What is the significance of R = 0 Ω in your “antenna”; Is there

Full set of plots for my current setup I am pretty sure they show the gypsy antenna is not that good now to find a way to improve it.

Here you go

Brent, My NanoVNA has a couple of circuit pads at that location (VDD and BOOT0). When shorted together at power-up, they cause the NanoVNA to enter DFU mode for firmware update. I suspect your unit