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I've asked Rudy to remeasure the short and open using MA (magnitude/angle) mode. That might shed some light on where the inaccuracy lies. Also, I think he was using averaging. It might be interesting

I think need recalibrate. Calibration must remove all errors.

Interesting - I wonder if it's a "round off" or truncation error of some sort.? The "detector" mixes with I/Q 5 kHz, summing, and there could

Carsten, my experience is all antennas, even those off the shelf one, need some finetuning. 1. Tuning - I would recommend the minimal height for tuning purposes is 3-4m over the ground at the end of

I tried this just last week. It seems work like a spectrum analyzer but having doubts about calibration. For this purpose I used Satsagen software and my HackRF One. -- ALVARO, EA8ARX

15070000 -1.000470519 -0.000045675 15194750 -1.000452399 -0.000081647 15319500 -1.000464559 -0.000072501 15444250 -1.000433683 -0.000034980 15569000 -1.000416160 -0.000060047 15693750 -1.000486493

@igor-m The summerhouse is in Sweden (900m2 Lot) , near Halmstad (outskirt of city). There can be both thunder & high winds (30m/s, when ugly) I was thinking of hammering 2 x 3M groundrods down , and

@Carsten: Lightning and Static: in the EFHW antenna with the transformer the antenna wire itself is grounded through the secondary and the coax via primary windings (a short for static). Your system

Measurement uncertainty? You're essentially measuring (V refl)/(V incident) with a noisy sensor.?? 1 part per 1000 (1.001) is 60dB.. the SNR of the measurement is in that ballpark. Calibration

@Carsten: welcome to the club.. EFHW antennas: I built several and I've been helping local OMs with building and measurements. The first step is to acquire an off the shelf one or to build DIY the

there were NEVER any v2plus4 clones.. so you will get a genuine one (i would now maybe buy a lite vna that goes up to over 6ghz but is a similar design as the vna v2 or v2plus4) the nanovna v2 has an

I've been analyzing Touchstone files Rudy Severns, N6LF, has recorded with his NanoVNA-H4. The magnitude of S11 is greater than 1 for many files. For example, after calibration right at the VNA

@All Thank you for the valuable input. @Roger , for the nice links to schematic & More specific groups. @gfmucci for the "Static warning" @Jim & Zack for the "Don't connect the FT-991A directly to the

And as far as static goes: Remember that any coax is, by design, low loss and can store a sizable amount of energy as a cylindrical capacitor. So, I always make a practice of "shorting" any coax I

I have been really careful about estimating power out of an amp. I have an HP 435B power meter with an 8484A head. Maximum power to the head is supposed to be 10 microwatts (-20 dBm). I carefully

The second most likely is "transmitting into it", or, more properly, making S21 measurements on a small amplifier that has output power bigger than the VNA can take. That 20dB gain block, driven with

"What is the most likely way that beginners kill their VNA ?" Static buildup especially in dry climates. I had one DOA and the vendor said static buildup killed it.

Carsten, Here is a link to the manufacturers Web site for your NanoVNA 2 Plus 4 Firmware, instruction manuals and PC software available there. https://nanorfe.com/nanovna-v2.html There are two groups

Hello Goup Old Ham here , but have never played with DIY antennas before , and have never had a HF Station. I have just gotten my first HF Ham station (FT-991A) , as i have "some" room in the