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Hi Herb, Still working for the next few months (retired but went back p/t for a year) BUT I will work on using a return loss bridge based on the Stockton design. The ARRL handbooks also have an RL

I posted this a week or so ago. The basic concepts are from G3TXQ but then found an Agilent presentation. G3TXQ reasoned out a way to do it but Agilent presented the formulas in a general form. I took

The further it is from 50 Ohms, the more inaccurate an impedance measurement is with S11. Gary W9TD

Hi Dragan, yes, that is basically what I have done - but I don't understand why reading the R and X values from the S11 graphs have different values from the calculated values from the S21 data - I

End of page, XLS and an explanation of the method: http://www.karinya.net/g3txq/chokes/

Hi, I recently got a nanovna and am really pleased with it. Thank you for your hard work making this device. Has the possibility of using a logarithmic frequency spacing been considered? I set up a

Hi, I have wound a few chokes on some FT240-43 and FT240-31s I have in my junk box. I am looking to add common mode chokes to my 39% OCFD and a new 80m to 10m EFHW antennas. Keen to get good resistive

I noticed the posts about a problem with the case. I completely removed the board from the case and it made no difference. I talked to the dealer and they are going to send out a new unit.

Upload compiled github version and name it as 0.8.4.5 Found bug (AIC datasheet very poor) on CH1 (search why H version work better on 0.8.4.3 on CH1 measure) update github code For better CH1 measure

Larry Where did you buy yours from? Best Regards, Dennis W2DWL

I set the power out of the Nano to max.? Traces seem more stable now.? I guess all is good.?? I ordered new doorknob caps for antenna anyway as it has been up for nearly 20 years. Eric WA3UYI --

Remove the unit from it's housing and see if it starts working. If it does, part of the housing is pressing on the touchscreen. Search the forum - there are a number of posts about that. If it does

Remove the front of the case.? The case may be putting pressure on the touch screen, which causes erratic behaviour. I put 4 nylon washers in as spacers to raise the cover above the screen.

Hi DiSlord, I just? re-tested variant number 1 and to my? big surprise it tested OK ! .....If I remember well you wrote that this was your last version 0.8.4.4..... When this is correct then

I just today got a new NanoVNA H. This is the one in the nice black box with gold lettering. First this is my second Nano. The first is the smaller unit. This new one powers up, has the splash screen,

DiSlord, I attached a picture of 25 Ohm measured after calibration using firrmware variant 2 and SMA-TEE + Female to Female adapter in NanoVNA-Saver. Please keep in mind that my problems with your

I had the problem at one time while using my MFJ-259B, which has a pretty robust +10 dBm output. Part of the problem was that it was a large antenna (135' inverted L) which picked up a lot of signal

On Thu, Apr 30, 2020 at 02:59 AM, Larry Weber wrote: ... One nice feature found on the NanoVNA-H4 hardware, which is not on the NanoVNA-H hardware, is the brightness control for the 4 inch display.

Hi DiSlord, Yesterday I have sent you my results? when using your firmwares 0.8.4.4 and? variant 01. ...Today I tested your variants 2 and 3 and BOTH are running? PERFECTLY !!! ....Now I am 100%

Hi DiSlord, Thanks for all the wonderful enhancements to the H4 firmware. I find them very useful and now I can't imagine living without them. One nice feature found on the NanoVNA-H4 hardware, which