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I believe the point that Dave Jones was making, is that the surface resistance of the mats does not have any adverse effects on 99.99% of the measurements one makes. I don't think his aim

Carlos The nanoVNA has about 5 to 10 dB headroom in S21 in alle ranges. This is done by adjusting the gain off the amplifier before the adc to the frequency range Biggest concern in overloading are

What is the difference between traces and tracks? Some firmware are said to be for 2 tracks or 4 tracks. In the Nano you can choose to show different traces. Is it two words for the same thing?

I'm playing with rather more exotic HW, a Tek 11801 & SD-24 TDR head which is a ~26 ps rise time TDR evaluating the quality of Chinese RF connectors. But the principles are the same and I'm very

On Sun, Sep 22, 2019 at 06:09 AM, Mario Vano wrote: CORRECTION: (I mistyped) - The multi-band dipole is my 20ft high 40/20 meter trap dipole that has been augmented with parallel dipoles for 15 and

Very interesting site, much to study in depth to learn more about VNA and CALKIT. I suggest inserting the link on the wiki page Maurizio

Carlos, Rune's next release of nanoVNA Saver will introduce "Averaging, including truncated mean. First version. " I am interested in seeing how users who have been requesting averaging for the

On professional VNAs, stimulus source is calibrated for flatness on factory with a bolometer. On nanoVNA you can't control stimulus output power, so we should probably calibrate the audio codec gain

It's been my experience what I've had problems with a vendor that they beg you to give them a positive report if they fix the problem. And generally they will jump through hoops to do it. Have a

David, For your reference here are the FFT's of the audio signal from CH1 while connected to CH0 at various frequencies. 50 MHz, 299MHz, 1200MHz and 2100MHz, all with offset of 4kHz Next the isolation

I use this SW for many tasks and interface via the HPIB bus to load calibration tables for my VNA(s). There are tips and application notes and excellent information at this site. The SW is free down

I've been happily using the NanoVNA and various versions of "Saver" for a lot of projects lately, but some were just motivated by curiosity about the device. Unfortunately I have no other analyzer to

Ideal resistive bridge response: http://ormpoa.altervista.org/nVhelp.htm#bridge

Hans, The tdr function, available standalone in the recent firmware upgrades and connected to a pc via software program, is good for evaluating cables. It can give you info about discontinuities,

David, antistatic mats are typically constructed of 3 layers: the outside being a work surface of some plastics composition and the middle is t

tuckvk3cca, Thanks for the feedback. I finally was able to find a directivity specification of 20 dB minimum for the Narda 3060-20 on the web, which is in agreement with my measurement made using the

For evaluating cables I normally just do a S21 log measurement, which is somewhat of a "catch all" test for losses due to impedance problems, cable defects etc. I only calibrate with a "through"

Further investigation did show the dsp algorithm fails to detect the intended signal but locks on a different harmonic so only thru measurement with a filter that removes unwanted fundamentals and

30dB is rather low for 10MHz. I can get 53dB at 10MHz and 37dB at 35 MHz but this was not measured with the nanoVNA.

At step 3 you can also use a shorted load. Then you have directivity for short. The two should be close about 0.5 dB. Also reverse IN and OUT to check symmetry.