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For those interested in the spectrum of the Si5351A here is a series of pictures, using my RFzero, at 267 MHz (i.e. 800 MHz "NanoVNA version"), 280 MHz, 298 MHz and 299 MHz. The pictures clearly show

@Larry, Brian, DMR In the meantime I have replaced the IP5303. Also the 10?F cap. But there is no improvement. The Nano still won't start on its battery. The battery can be charged normally. I have

No battery needed for saving calibration data, It is stored in flash memory

@ warren Your nanovna is ver 3.1 printed on pcb with shields for three sections. Is it the latest PCB Version. Is internal battery necessary for saving Calibration data. 73 de VU2PGB VEEN

Bruce What you are seeing is leakage through your attenuator. Attenuators intended for HF work and below, especially those with a network of mechanical switches and resistors, often display this

I just did the experiment here with my hp 355D 100 dB attenuator/ 10 dB steps. Attenuation is spot on and the VNA follows it just fine all the way down to 80 dB. No surprises at HF. If you have a COM

Hi Bruce. Interesting. Well, I have measured HF filters whose center frequency is less than 30 MHz and readily saw skirt responses that were 80 dB below the pass band response. Now I made sure I took

Hello yin&pez, The software documentation mentions that there was a Mathematica version of the software tools, even though the Matematica version may not be uptodate, I am better at reading

I have a step attenuator with a series of switches (1-20 dB assorted values) that can be combined for (in theory) up to 80 dB total attenuation. Measuring the S21 individually, the 1,2,3,6,10,and 20dB

Reginald could you please explain what means this equation? What means "d" and "a" variables? It seems that "f" is frequency and "t" is time, but I'm not sure what frequency and time exactly? If "f"

leave cable in place for two decades and more. It should be changed out regularly, of course. course, for irregularities but also to measure the length physically and then relate that result to what

Neat antenna response with the double frequency match. They did a nice job. Would be interesting to see how the radiation efficiency holds up. Alan

20 : Measurements with Core Uncertainty Hello, Allow us, please, to inform you that in the course of preparation for the final comparison between VNA and NanoVNA, which we planned to base it on

Testing a U/V Baofeng HT antenna with my modified nanoVNA software.

Last edy555 firmware DFU. 27-09-2019.

Larry, I deleted the un-edited user guide I uploaded in favor of your version. We appreciate the effort you spent cleaning the user guide up. Props to ch045 for authoring the original guide. Herb

Hi Rune Measuring phase is much used by me. It you e.g. want to measure using the port extension (in ps) to the end of an adaptor to which you solder leaded components then you check the S11 phase

Paul, I uploaded a manual in the files section that has the answer to that. It is authored by cho45. My version has live links. Hope this helps

Solving d = a*exp(j*2*pi*f*t) with 256 measurements will give better accuracy than the 32k point FFT with far less computation. The sole limitation to the accuracy from computing a linear fit to the

No such thing as bugs... they're all undocumented features.?