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For those of you who would like to use the resistive pad to match 75 ohms to the 50 ohm nanovna, the series resistor is 25 x sqrt of 3 (about 43.3 ohms) and the shunt resistor on the 50 ohm side is 50

Other than the name, "ANTENNA TUNER", why is the 'conventional knowledge' so prevalent that the "ANTENNA TUNER" actually "tunes" the antenna. *IT DOES N O T !!!!!* It functions ONLY AS A MATCHING

I assume the book you are referring to is "Antennas" by John D Kraus. Jim mentioned it here: /g/nanovna-users/message/16645 FIrst edition printed in 1950, second edition (with Ronald

No, I mean to create a parallel LC-circuit: the inductor will be parallel to the series connection of the C32 and C33 (tapped to the ground in their middle but this does not matter). That LC-circuit

Thanks for the book link. I just downloaded it and read the first few pages, it will be a good read. Dallas N5fee

So you'd make a Rseries L series, C shunt, low pass configuration? I think that won't have the effect you expect. Don't forget that those inductors have a fair amount of resistance, too. In any case,

Jim, Then Miro's question remains: What happens to power reflected back from the antenna feedpoint if there is no antenna tuner? Without a tuner, it is not all getting sent back out to the antenna.

Only if the transmitter has some sort of isolator (in a logical sense) to push the reflected power to a load, and that's pretty rare in a HF transmitter. What really happens is that the transmitter is

I use a small zippered cases for my VNA that was made for a small PC projector. I has a carrying handle, rings to attach a shoulder strap (that I don’t use) and plenty of room for a clear box with

Not necessarily - for small mismatches, the tuner, even at the end of a transmission line with 10% loss (1/2 dB) makes it so you don't have to go out and keep readjusting an antenna that's narrow

Hello! Would you recommend an LC-circuit as an IF filter? I'm looking into using one of [url=https://static.chipdip.ru/lib/261/DOC005261729.pdf]these[/url] SMD inductors (~hundreds of μH) as a coil.

@Dr. David Kirkby: Just like Dragan Milivojevic, I am also curious to hear what the flaws are in Larry Benko's videos. I actually find his videos very interesting and helpful. But I also understand

Folks, You can translate/convert PDF documents online at: https://www.onlinedoctranslator.com I translated the document to English and attached it. Enjoy! Larry

Here is an application report on the NanoVNA-H and SPICE simulation. The report is in German. Enjoy!

If you want some encouragement read Kurt N. Sterba’s articles from the Olde World Radio journal. It’s free now. That’s $0.00

Antenna tuners cause any energy reflected from the antenna to turn around and head back out to the antenna again. So if the antenna is reflecting 1/4 of the energy back to the antenna tuner, after 2.5

Jerry wrote: "...No, you can't just add transmission line length and get any purely resistive load looking into the transmission line that you might wish." I agree, having complex impedance involved

...I hit "reply" too soon... ... given: * short run of low loss t-line * no match between TX, t-line, antenna impedances * antenna tuner makes t-line/antenna appear to TX as TX's impedance (SWR at

So, based on what Dave and Jerry are pointing out, I have two VALID conclusions 1) Antenna tuners suck! They make t-line/antenna go gently on TX, but they hide what's behind them. Strive to have (at

after careful calibration the swr seems to be reading correctly with high values on the edges [email protected]> wrote: