开云体育

Dave, I cut a high loss barrel apart. The construction does not look terrible for the frequency range involved. (It has a bulge in the center of the inner contact to help lock it in place in the

There is a facebook group? If it is true, thats about the best thing to lower the noise floor in this group. Just send noobs there and let the childish admin deal with it ;-) Btw I have nothing

Q-factor is pretty simple to calculate: Q = Fc / BW where Fc is the center frequency BW is bandwidth of the circuit You can measure antenna bandwidth by it's VSWR level with using threshold VSWR = (3

From The ARRL Antenna Book:

I am currently without a linux box to verify, but expect these instructions to work: https://g8ogj.org/files/Using%20USB%20serial%20ports%20under%20wine%20howwto%20ipb.pdf

Hi qrp.ddc Wrong, the cables are part of the NanoVNA hardware and cancelled out during calibration. The may cause phase changes when bended during practical measurements Kind regards Kurt

It good to see this question here. I was band from the Facebook group for replying to some who posted about this and posted that gigaparts sold them for $80USD. Ai replied that this was a ripoff when

The definition of Q varies.? If operating on a single frequency, it's a simple ratio. The parasitic resistance of an antenna, the losses in the parts, have to be part of the equation.? But the

How is the antenna's bandwidth defined? Is it the width of the 2:1 SWR range? So what is the definition of an antenna's Q. The Q of an impedance (Z = R +or - jX) is X/R. The Q of an inductor is Xs/Rs.

Hello gin&pez@arg; I interpret variables r and i as reflected and incident respectively in this context. Is this interpretation correct? In paragraph 8 please clarify the difference between "a and p"

Hi, Nice packaging. However, as you use it, you will realize that the 30 to 60cm 50 Ohm cable used for calibration will be calibrated with SMA terminals. The same piece of cable should be left in for

Hello, This email message is a notification to let you know that the following files have been uploaded to the Files area of the [email protected] group. * /NanoVNA Tips for new and prospective

This afternoon, I discovered what caused the "Invalid input string format" message. TAPR requires .NET v1.1, which must be searched for and installed in a language appropriate for the PC operating

Hi Rob, simply you have to tap "CAL MENU" and then "RESET". The "RESET" button will highlight and stay highlighted. Invoking the RESET function will destroy all the previously saved calibration data,

Excellent! :-) I have put in code to recognize your versions then. -- Rune

Hi Tom, Welcome to the group. If folks are wondering what to look for in terms of the screening can, it can sometimes be seen in the pictures on some listings (see attached). Also try and make sure

Yes

Howdy Tom, and greetings to the group! I'm also a newbie; just received my nanoVNA 2 days ago. I ordered one before reading anything here; went a bit up-scale on the price, and lucked out and got one

It is *different*, but is there a reliable way to distinguish them? ;-) Do you use the same additional version text? -- Rune

The version text should be different