开云体育

Maynard - Thanks for drawing. Here is another one that illustrates what I was posting. It is from this site -->> https://www.dj0ip.com/Common_Mode_Current

Richard, it is safe to continue and update with that message. I think it is a feature of the final DFuseDemo version. It also appears on my Win10 computer, and I proceed and update and it works fine.

Set up your number of points and start/stop so that measurement points/markers coincide with your desired frequencies. Hint: numbers of points ending in "1" like 201, 401, tend to make the math work

Great description, Roger, A diagram which illustrates your description of the skin effect in coax is attached (hopefully), 73, Maynard W6PAP

I am using STMicroelectronics: DfuSeDemo.exe The Dfu file is DIsLord Version 1.2.27 see the image below. My NanoVNA H4 is: HW version 4.3_MS. I reloaded the Dfu file once again. I've tried several

Dave made some very good points but perhaps some clarification is needed for those new to the topic. What follows is a simplification of the RF theory involved. For more details see any textbook on

There is no capability on the NanoVNA device itself to enter a marker frequency. It is easy to use the jog switch to set the marker frequency. It will quickly jump between frequency measurement points

Am I missing something? This should be a common feature. I need the ability to dial in the exact freq of markers.

What software are you referring to? Dave - W?LEV [email protected]> wrote: -- Dave - W?LEV

BS...... The NANOVNA is well shielded. How many times do we, collectively, have to remind others that holding onto the VNA while making measurements is allowing your conductive body to become part of

Thank you, Roger! How many times do we (collectively) need to write something like you (and I) have!!??? The reader evidently doesn't read the replies. SUGGESTION to PROVE A POINT: One additional

Hello: I’m reading this topic since a couple of hour. Its clear that NanoVNA has a poor shielding. These instruments are very cheap …the good news is that there are many things to enhance on them.

A hamstick is a helically wound whip antenna with an adjustable stinger for tuning the antenna to a desired frequency. But it is only "one half" of an antenna system. The other half can be another

The timeline for submission of papers and presentations has been extended to March 17th.

The VNA and you, when hold on hand, are part of antenna. You must change the installation, feeder route, ground if possible properly. Any trick to allow a reliable measure if removed later for normal

Not familiar with windoze tools but it seems that it is complaining that the firmware is in the wrong format. Try the .dfu firmware file? Anyway you can't brick these devices, even in the worst case

Insertion Loss method ( this is resonance with VNA) uses to produce Q values higher than Q meter. Take note that Q meter measurements are absolute , independent of residual capacitance on inductor,

Thanks for thinking about this. I went back and measured the #22 coil several ways and everything seems to agree within known errors. With the 260, I just use the capacity scale (they call it mmfd !),

Can anyone explain this problem? I'm afraid to proceed on my H4. I FAFO and bricked my 2.8" H. RJ K8CYK Attachments: - dfu.PNG <https://kenwood-hybrids.groups.io/g/main/attachment/13465/0>

Thanks a lot for the prompt reply Colin. Shall come back to you in case it doesn't work out. 73 Jon, VU2JO [email protected]> wrote: