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THAT looks much better built .. and shows the predicted results ... GOTCHA :-) looks neat .. and works like it should so you see its very often not just the components you use but how you arrange them

Jim, Dave, et al., Thank you very much for your suggestions. I rebuilt the filter using discarded SMA connectors I found in my junk box along with actual 270 pF caps that I ordered overnight from

This - get some 4 leg SMA jacks and solder two of the legs to the copper clad at the edge of the board. Cut the upper two legs off. That will give you a nice transition. Depending on where you are,

Does anyone have a web-site or youtube that goes through the set-up on using the F V2 for checking Coax lengths. The new one I have does not show the correct length, example a known 15.24m / 50ft coax

How do you know it's filtering the harmonics out? Feeding in a square wave (into a non-resistive load) might not have the harmonic structure you expect. It's really hard to interpret the wiggles after

Larry, I still use Brian's excellent antenna simulation programs today. In fact, just about every week. (Different story not for here.) But, I run them on both a very new macOS computer and a Windows

I couldn't connect to the unit and somehow managed to wipe the processor. I've tried resetting it to reconnect, but the only response I get is in STM32Cube Programmer 'UR is set by HWrst' or something

Things are beginning to look a bit more like a LPF with the "ground" connected! Other suggestions have been made which are right on. Keep us posted on your progress. Dave - W?LEV

You may be looking for the graphical version of the map, but I threw this into the AI Grok app on my iPhone and it listed them all out. “ Menu Structure Map for the NanoVNA F V2.” You may or may

There are a bunch of them online. Have you tried Googling? Compare the menu that you think is right to your NanoVNA because there are several variations. [email protected]> wrote:

Off subject, does anyone know where to get a Menu Structure Map for the NanoVNA F V2. My new one did not come with one. Thanks ________________________________ Sent: Thursday, March 13, 2025 1:54 AM

Mitch, Try making the ground connection to your filter very short, say 5mm or so. Also, try multiple ground wires. The currents to ground from all the capacitors in the filter flow through that ground

Hi Jim, Thank you for your suggestions. I will shorten leads and properly dress the components tomorrow. BTW I had no 270 caps but had 50s and 220s, hence the two caps in parallel. You make a really

Hi Jim, Correct. I failed to connect them. I've repaired it and get a slight improvement. See pic just posted. Many thanks. Best, Mitch NK3H

Alan, exactly right. I failed to do it. I just posted a pic of the result of adding leads from copper plane to the ground on the test rig. Thank you. 73, Mitch

Correct. I failed to connect the ground plane to the connector grounds. I did just that with hookup wire soldered to the copper and connected to the ground of the test rig. A slight improvement. See

Alan, I agree 100% on neatness, lead length, etc. This was supposed to be just a test project in anticipation of properly building the filter. From your comments and others', it appears I need to use

Dave, Thank you for your reply. Very much appreciated. In order: 1) Done. 2) Yes, I measured all components with my LCR meter (DE 5000). 3) Correct. 50 ohms confirmed by others for this filter. 4)

HI Dave, Yes, it's there. The line goes across the very top of the screen, and the print shows "S21 LOGMAG 10 dB/-0.00 dB" in gray. Thanks for any help. Best, Mitch NK3H

The only measurement noted at the top of the screen was S11. Was S21 also there? I didn't see it. Dave