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You will get much better results if you calibrate using the clips as the "reference plane". You just clamp them in a fixed position a short distance apart and then use a shorting wire, an open and a

Or, even better, designing the circuit so it doesn't rely on undocumented behavior.

Certainly in production you can run into problems relying an unspecified characteristic of a component. Those characteristics may be different from different vendors and may become different from a

If you're going to do that, why not just slap a RPi on the back of the NanoVNA.? Then you can use any wireless interface avai

You do not have to talk me out of soldering to the CPU. I am really not trilled to do that anyway. As far as model number - the battery seem to be "superguled" with sticky tape ( ?) so I did no

Such is part of the art in electronics. But if a designer wants to get an advanced degree in electronic art, then he also needs to match the composition resistor's long-term drift to that of the MMIC!

Attached are some useful info for making VHF and UHF reference dipoies including a neat design for an impedance matching balun using semi-ridgid coax.

Thanks for the explanation. It's been quite a while since I studied the system design. Have Fun! Reg

Is it possible that your coax is not really RG-58A/U? I created an EZNEC model of a free space 340 MHz inverted vee. The element lengths and angle between them were optimized for a 50+j0 ohm feedpoint

Certainly, the feedline can act as an impedance transformer - but it's also a phase shift. In particular, it will change the phase of the reflected wave. Let's say I have an antenna that is resonant

Why you think it bug? NanoVNA use 5k IF for measure (this firmware). But as it VNA and not SA - not need add filter for mirror supression. So you see main IF peak and mirror 5+5kHz

Frank - Thanks for the comments and information. The calibration for the first attachment was the standard Open, Short, and 50 ohm Load calibration done at the Channel 0 SMA connector on the NanoVNA.

On 7/21/21 12:33 PM, Manfred Mornhinweg wrote: >> We always knew clipleads are bad, the question is really "how bad is it" > > - A 1/4W carbon composition resistor. It has an interesting but pretty

A 10 MHz input to CH1 produces logmagnitude plots with peaks at 9.990 and 10 MHz. Source is a tinySA w/ a 40 MHz BP filter. Clean to within what my 8560A can detect :-) Have Fun! Reg

That W1DX article appeared in QST three times, November 1991, April 1977, and March 1956. There is a lot of misinformation about transmission lines/SWR in the amateur community and I suspect ARRL

I'm curious if you first calibrated the transmission line with a 50 ohm load at the far end. Does the transmission line come away from the antenna perpendicular to the elements? A half-wave dipole

There was specific mention of a 1(?)-second timeout on AT commands in one of the recent links in this thread. 73, Willie N1JBJ

Well, pretty bad! :-) Since I had the test jig set up and calibrated, I put some other 100? resistors in it. Test results of each are attached. The guinea pigs were: - A run-of-the-mill 1/4W carbon

Read also this /g/nanovna-users/message/22407?p=,,,20,0,0,0::Created,,posterid%3A4247573,20,2,20,82990168

Jim, no attachments. Dave - W?LEV