开云体育

When you go to put a connector on the open end, make sure the center conductor of the cable is flush with the end of the center contact on the connector. Trim the outer cover, shield, and dielectric

Note that the calibration standard can be any value BUT the reference impedance (impedance for S11 being 0) remains 50 ohms. Allowing you to set the calibration impedance simply frees you from the

I've used 30w Caddock noninductive TO-220 package resistors for this kind of thing, but they *are* a few bucks each. You're probably better off just buying some cheap metal film 50 ohm resistors and

Thank you for the info. I’ll update nanoVNA connect when I get home. Ward Ae6ty

Thanks for all the replies. It sounds like for the frequencies I'm looking at, there won't be much of a difference no matter which method I use. @Lou W7HV: Could you point me to where I could pick one

Hope, We have this video again. Luis T.

On 7/16/21 8:12 AM, Zack Widup wrote: > I found this fascinating. I need to make an attenuator for my FT817 on > transmit as a 432 MHz > microwave IF radio. I have the appropriate carbon-film

I found this fascinating. I need to make an attenuator for my FT817 on transmit as a 432 MHz microwave IF radio. I have the appropriate carbon-film resistors. I measured them on my NanoVNA to see what

It is important to remember that "accuracy" and "precision" are two separate characteristics of any measurement. DaveD -- This email has been checked for viruses by Avast antivirus software.

The need for calibration and how frequently, varies with the measurement. If you need great precision, like accurately measuring a 40-db return loss, you might need to carefully calibrate several

I always do the calibration with the NanoVNA by itself, not connected to a computer. I have saved several band segments that I frequently use (say, 45 to 55 MHz, 140 to 150 MHz, 420 to 450 MHz) with

That doesn’t address the point.

HELLO ALL As of July 16th: I gave the Nano VNA talk in two installments to the Leicester Radio Society (UK) but I did not record it and I did not post it. I'll contact the person who did post it and

NanoVNASaver also uses heuristics for NanoVNA V2plus4: https://github.com/NanoVNA-Saver/nanovna-saver/blob/b0a21bc164bc23a64f368a8f86b8faf1cc4a9969/NanoVNASaver/Hardware/NanoVNA_V2.py#L150 this might

thanks, DiSlord. Once I changed bandwidth to 4kHz on NanoVNA H4 then SimSmith connects/interacts with the device. I tried both 101/401 data points and both settings are okay. Still no luck with the

50 ohm PL259 O239 connectors are readily available. Agree that if the discontinuity is very short compared to a 1/4 wave it make little/no difference. Going from a 50 ohms, through a 30 ohm PL259, and

I can connect SimSmith vs my NanoVNA H4 SimSmith use old data exchange format, and not allow get data if set low bandwidth setting on Nano (need more big timeout)

Look at W2AEW YouTube channel I think he did a video on this. 73 Fred KB4QZH

Very easy - cal the vna, hook up your coax, look at the *phase* of S11.? Cut until the phase is zero degrees at your frequency of interest.? Your cable is a multiple of half wavelengths. 180 degrees

Forgot one important note. Trim the coax stub until the dip is at the desired frequency. *Clyde K. Spencer*