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Not actually pulses, it's a CW measurement. It puts a CW signal out at a frequency, and uses a bridge to measure the impedance (or reflection coefficient) at that frequency by comparing the amplitude

I believe it works like this: It sends a pulse of RF at the Nano's 'start frequency' and analyzes the phase and amplitude of the return signal (like an echo?). Then it sends a pulse at the next

Oops, yes.. I used those because I had an application where I wanted to be able to change the turns ratio, so I have a 6 pin DIP socket, and I can plug in the T1, the T4 (2:1), or the T16 (4:1). And

Well the data sheet doesn't say much about the electrical properties of the interface other than to say it's 50pF and compliant with the $600 spec.. However, this ap note on antenna design..

You have a typo in the component name - it's "X65", not "65X", but great find! https://www.minicircuits.com/pdfs/T1-1T-X65.pdf

Yeah, the NFC Forum restricted those specs a while ago, for the good of mankind I'm sure. The 2011 and 2013 versions are still out in the wild on Google. But NFC Forum is not the chip company. This

Jim Lux wrote: “google for "woodward balun balance quality 1983" “ Thanks, I no longer have academic access, so will need to buy or get site of the paper some other way. However, there might be

And of course, the RF interface spec for the chip is something you have to buy from NFC Forum. (for the princely sum of $600) It's just a transformer with high leakage inductance. That is, you can

google for "woodward balun balance quality 1983" The paper works through the math of using a VNA to do the measurement as a 3 port device. Yes, and they publish N-port VNA measurements. 4 port for

I agree with Jim Lux. The inductance of an "ideal" inductor does not vary with frequency but any physical ("real world") inductor will have its inductance vary with frequency. In the case of an air

The answer(s) to your question depends on what you want to know about it and what type of Tuner it is. For example, I have a homemade manual Tuner that I built many years ago, and, having learned a

Jim: The tag in the photo is an NXP NTAG203 chip in a Smartrac Bullseye inlay, about 10 years old. Smartrac never published the exact part number of Ntag203 in inlay X, and doesn't really exist

Hello Ed, Op ma 18 jul. 2022 om 08:26 schreef Ed G8FAX <ed@...>: Like the HAL document, Fig 16b. Thus, I see that the ‘open’ measurement of the DP paper (fig 2 (c) is part But if

ideal inductors have zero diameter conductors with zero resistance, and the inductance is proportional (approximately) to *square* of turns, (if all the turns are equally well magnetically coupled)

Marco is correct. The inductance L does not change with frequency (except for the small non-linear effects of the core materials). HOWEVER, all real inductors also have parasitic capacitance and

What you say is correct but that is nitpicking : The value of an inductor does not change with increasing or decreasing frequency . 100?H now equals 100?H just as 100KOhm is equal to 100KOhm . If

Some ATUs "remember" the tuning setting when power is off, others don't. (i.e. some use latching relays, others don't). What you should see, looking into the tuner, is the S11 with a dip at the tuned

Thanks, you are right. My fingers were writing in dbW but my mind was working with dBm. Thanks, *Clyde K. Spencer* [email protected]> wrote:

Thank you all. I've attached images of some early readings made with the NanoVNA as I explored. It's an extremely valuable tool. I'm pleased to confirm I am using it correctly. The traces I was

Hi Clyde, Reading your message, may I correct your example? I.m.o. +30 dbW -> 1000 Watt and +10dB*W* -> 10 Watt -Kees, PE0CWK Op 18-7-2022 om 14:53 schreef Clyde Spencer: