Driving a non-class A amplifier is complicated. For one thing, the input impedance varies significantly with supply voltage and drive/power level, and to some extent the output tuning........ 2:1

Quick question. What nanovna is this https://nanovna.com/?page_id=87 referring to? Fred N4CLA comcast.net@groups.io> wrote:

Why not buy an " Antenna Analyzer"? That will  do what you want. 73, Geoff --> AB6BT

Don't you have a few little HT antennas you can attach to the VNA to learn the instrument in the comfort of your home?

If you buy an instrument, you take time to learn how to use it. SWR is a weak measurement on its own. The Smith Chart is your real best friend. There are many YouTube videos on the instrument and the

Hi Bryan,Of course the real question here is possibly why is there a mismatch  between the output of the qcx and the input of the amp? They are presumably notionally both 50 ohms. Is it really

Hi Brian, Indeed if you characterize the impedance you can arrive at a fixed matching network. If we suppose the QCX requires a 50 Ω load, a reasonable assumption, and the QRP Guys tuner got it

Is there any way to determine a tuners L and C settings/values such that a fixed PI network could be built to replace the tuner. Case in point. I have a QCX and the 50w amp which exhibits a mismatch

Nizar, Are you trying to use 75 ohm coax with a transmitter designed for 50 ohm? If so you should be not be using the DiSlord impedance setting which changes the system impedance to 75 (or 77)

I am looking from a point of view of someone that does not yet understand many technical things. I may not have time or interest to learn them. So for a person that just wants to simply measure let's

Not really . . . apps need to be compatible with the runtime libraries (try to run something too new on a Linux based system, and the errors you getvare almost always symbol errors from libc, not

Rick, That's true to a certain point. However, the API is just an interface to the kernel and must be compatible with the kernel. Changes in the kernel often require changes in the API. Perhaps not

I had a hard time determining if the Demo RF Kit was the same as offered by Amazon and other vendors. I think the person who initiated the Post should have first taken a picture of the RF Demo Kit to

there seems to be a debate as to where or how to purchase a nanoVNA. They are all made in various factories in Mainland China. the issue is not so much (in my mind) if it is a clone as in reality they

I don't see it being practical. All those options exist because people do so many different things with the instrument. I for example use the same settings 95% of the time, only the start/stop

I take your point, but I feel that for many purposes start and stop frequencies are all you need to change, perhaps followed by a calibration. I guess the TDR measurements (find a cable length or a

Hello. I just wanted to ask if there is any interest from the community or the developers to make the menu easy for radio amateurs, for people that are not engineers? Currently the menu is a big mess

ai0k.net@groups.io> wrote: Nope, it's not the kernel version, it's the version of the Android API that the application was built under. Newer API versions don't support very old versions of

Peter, It looks like you have an older version of the kernel, which could explain why you can download it and I can't. 73, Jerry, AI0K

Hi Stan Thank you for your summary of the common sense of an experienced, it is convincing, in fact I have just done the comparative tests of the same dipole antenna with the same coaxial cable Zc =