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Hi Mitch. Dave can assist and we have confirmed that you filter in indeed set up for a 50 ohm source and load termination. The response is validation from a simple AC simulation. I looked at your

Hi Dave, S21 is the gray, I think (the not yellow one -- I'm color blind) print at the top right of the screen in the last two images I posted. It's line is flat at 0 dB across the frequency range

These plots compare reference impedance renormalization using S11, S21, S12, and S22 (yellow) with using just S11 and S21 (cyan). Shown are results for two different 10.7 MHz Murata ceramic filters

Please measure S21 instead of S11 using the NANOVNA! All S11 tells us is the match (which is pretty bad!). Dave - W?LEV [email protected]> wrote:

Thank you Alan. I've attached an image of the whole setup including the filter, the test rig and the VNA. Please note that I'm just using hookup wire to connect the filter to the testing rig--no SMA

1) Please post a schematic (already requested). 2) Did you measure the individual components before constructing the filter with them? 3) We assume the filter is designed for 50-ohms in and out?

One last item, on your scope pulse gen measurement. Dial your pulse gen back to 100 kHz, you should see the fidelity of the square wave as measured at the output load termination R. As you increase

Also, I would do your setup and cal over a frequency range of 100 kHz to 30 MHz. This way you should see the FLAT DC response of the filter, well below its cutoff and then see its roll off and

Confirmed and looks ok... Mitch. Assume that your layout is such that the inductors are ideally non coupled to each other, ideal each at right angles. The connectors are panel mount? Soldered their

Great. Give a few moments to run a check on what we should be seeing.

Here's the filter I built. Laid out on copper plated board. Capacitors are all grounded on the copper ground plane. Thanks. Mitch NK3H

Please post a schematic of your filter. Assume it is designed to operate in a 50 ohm system.

I've searched through the message list looking for symptoms similar to mine and didn't find anything. I'm somewhat new to this and would appreciate any help you can offer. I've been trying to get my

1 Hour... Good info... Excellent Intro.... Time well spent.... From R&S. https://event.on24.com/wcc/r/4871656/262AE419BBD73FA413BB90B6EEB73F0D?partnerref=mid_28133_na_m4c_inv-vna

I would return it. Alternatively check with the manufacturer if your unit is genuine and that their warranty policy is. [email protected]> wrote:

I got it from an auction site called nellis auctions. They sell surplus amazon merch. I have called them and they are will to return my $$ upon return of defective unit. But cannot exchange it for a

Thanks, looks like this is the only answer I got. Where could I get a more definite answer? This should be mentioned somewhere, in a documentation or in gitlab. :/

I managed to get it work with v1.2.40 firmware from DiSlord and the DfuSe Demo software. Initially I was using the wrong path to update the firmware, essentially uploading instead of updating, like in

Hello everyone! I managed to brick my nanoVNA H (clone, as I've found later on this forum) and now it is showing a white screen. First of all, I should have read this forum before the purchase and

Yes, use ZeeTK, the new version firmware will perform an LCD clear during the boot process and the color stripes will disappear after boot.