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Hello, thanks for the information. But the question is nothing extraordinary and simple: Suppose you have just tested with the nanovna 2 filters 2 poles 45mhz. They look identical. If you want a 4

TenTec had their "Patented Jones Filter" which worked very well. It was more for a variable bandwidth, but some of the techniques may apply here.

Minor point, but QRM is interference from other stations. QRN is interference from noise.

On my V2Plus4 it needs to be entered in percent. e.g. A velocity factor of 0.73 should be entered as 73.

Hello, Jim, yes i known that But i have 5 filters 45R15AZ. No black dot. My question is: How after testing then with a nanovna select the 2 betters, and the best combinaison to connect them? cdt

OK, I'll add a small correction to that last post ...measurement accuracy...the nominal value of an inductor or capacitor is highest at 0+j50 ohms or 0-j50 ohms, respectively. Just so people don't get

The reason why people make measurements at +/- 90 degrees on the smith chart is because the measurement accuracy using the shunt configuration when trying to measure the nominal value of an inductor

Mini-Circuits has TONS of applications literature, and like their products, it's pretty much all top-notch. Look here: https://www.minicircuits.com/applications/application_notes.html and here:

The black dots connect together in the middle of the pair.

Yet another splitter document. This one is from Mini-Circuits: https://linearparts.com/documents/AN10-006.pdf RT

is velocity factor entered as percent or decimal? I can't remember which it's supposed to be, but that *would* make 100 ft look like 1 ft.

Here are some screenshots done with my nanoVNA-H4 - One show S21 being 0 dB with cable attached between ports (right after calibration) - Next shows S2 noise floor with no cable attached between ports

The techniques used in the latest firmware to calculate the loss is probably the the "Return Loss Method" of calculating Matched line Loss for a transmission line using an open circuit (or short

Yes, I forgot that option. A battery powered receiver tuned to the frequency of the interference is an indispensable tool in hunting interference. Dave - W?LEV wrote: -- *Dave - W?LEV* *Just Let

Maybe , if you rig an antenna of some kind, directional? But why not use a radio or a tuned circui with detector or...??73'sRon W0QVJ

Hi Jim , some information was needed to try to help you. Which version of firmware are you using now , and are you sure that the setup of the nanovna in correct to do the TDR measure ? . the same

I hooked up my nanoVNA to 100ft of Belden 9913 to measure length and it shows it's about 1 foot. I tried other cables and got the same thing. It worked in the past. The cables are good cables. Could

The task you are describing is far better served by one of the following options: 1) What you need is a spectrum analyzer, NOT a VNA. The TinySA is quite affordable and capable for the purpose:

Can i use the nanoVNA to search for a QRM source? As the simple person that i am, i am thinking about connecting an antenna to S2 and trying to make something of the signal i'm getting. Does the

some precision, no black point on these filters