Return loss has nothing to do with antenna radiation or efficiency. It is a measure of the impedance match between a source and a load. An antenna with high ground losses could look wonderful from a r

My sincere thanks to RATPAC for arranging this presentation and of course to Alan-W2AEW, who I've been following on Youtube since I first stumbled on one of his NanoVNA videos last week. He is truly a

How much power is being absorbed by the load (whether it is radiated is another story entirely). 10dB return loss means 10% of power is reflected back *if the source is 50 ohms*, which it might not be

Return loss - I could be wrong, but I see 'return loss' as an indication of how well the antenna is radiating instead of reflecting. O db return loss indicates that all of the energy is being bounced

Thanks Neil, Very well worth watching Alan's presentation. For those not familiar, Alan's entire channel on YouTube (W2AEW) is outstanding. 73 de k1jbd bammi

W2AEW Alan knows the material and is an exellent instructor. His videos are exsquisite . The Nano VNA is quite the tool. Be sure to do an adequate calibration. I found it much easier to use once I loa

A recent ZOOM presentation was made to members of the Amateur Radio Emergency Service to introduce the NanoVNA. It's about 105 minutes long (I haven't watched it all yet) but it seems to be very well

RESISTANCE IN YOUR COAXIAL CABLE STUB Your antenna has R = 0 Ω. The R+jX (Ω) chart allows for positive and negative R values. 1) What is the significance of R = 0 Ω in your “antenna”; Is there an “RR-

Thank you, Jean-Roger, for taking the time for an extensive answer! I had to lay down flat on my bed with this one ;) This response got long. I tried to get it all in there, not necessarily expecting

Thank you Christian, for answering! Complex Scattering (including the impedance from S11) refers to all the S-parameters being calculated from readings of scattered current and voltage waves, being co

Thank you for answering, David. This is also what I know and related to, with both the Impedance and Admittance having a Real and an Imaginary part. But Jean-Roger have got to the core here; The "Real

REAL and IMAG parameters are quite different from RESISTANCE and REACTANCE parameters. REAL and IMAG apply to reflection coefficient Γ, in its complex form (a+j.b). That's why values are always in the

The first displays the complex scattering parameter (S11 or S21), the second display the complex impedance calculated from S11. Regards Christian

Imaginary = ±jX (just presented in different forms) Capacitive reactance carries the negative sign (bottom half of the Smith Chart). Inductance reactance carries the positive sign (top half of the Smi

What is the difference between the curves in "Real/Imaginary" vs "R+jX (Ω)" Charts - in NanoVNA Saver and NanoVNA 2_2 ? What do they represent, as they usually have resonance on different frequencies?

It would be good for this to be posted to the wiki and/or in a file download location. The questions about how to do TDR measurements one up frequently, and last week we had a very rude and frustrated

Thank you Bryan for your excellent and very explicit document. Jean F5EDP

nanovna users: Sometimes we are handed equipment that we want to use; however, we are not given any information about that equipment. I experienced one such issue recently when I purchased a house wit

Keysight "RF Microwave Signal Chain & Network Analysis" webcast added to External links: https://groups.io/g/nanovna-users/wiki/13116

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