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There is for sure a problem with this measurement. When the two GD-peaks in pass band looks like this something is wrong. That is confirmed by the pass band curve that is too un-symmetric - rolling

Hi David. I understand and it is often the case when measuring with Network analyzers. In the first setup you find all the flaws and the second is much better. I have experienced it so many times, but

My H4 arrived today. Although I didn't pay for it, it looks like it shipped by DHL on the 15th of Feb, arrived YYZ on the 20th, and spent the rest of the time clearing customs and taking the slow boat

N-connectors at full legal limit: I exclusively used N-connectors when doing EME at 1.5 kW on 2-Meters. No problem. A short run of RG-8 coax to the Bird meter got warmer than the connectors in that

This reader operates in the 13.56 MHz ISM band. The reading range is very close-in, roughly to 1 cm. While the RF link is established by an "antenna" of sorts, it is not an antenna in the usual sense

Pl-259 was invented in the 1930s as a form of shielded "banana plug."Sent from my Galaxy Tab? S2

It's interesting how the focus or center of discussions drifts. This started about testing filters with UHF connectors, so obviously they would have to be used in this case.. The discussion of N

Hi Daniel,I have no idea what you are building (HI), but I Googled "mfrc522 antenna" and got LOTS of sites, including construction pages.Good luck.Ed? KB8ESVSent from my Galaxy Tab? S2

A simple google search: https://www.google.com/search?client=firefox-b-d&q=rfid+antenna+design yields: http://ww1.microchip.com/downloads/en/appnotes/00710c.pdf check page 20 for details. Hopefully,

Hi Everyone, I'm trying to develop my own rfid antenna for mfrc522. It's my first one, so... it's very difficult. Do you know the procedure to properly tune my antenna ? Or a good tutorial to help me

Less than 690ns of group delay difference is quite good. Is this filter specified to be a linear phase filter? Is there an inter symbol interference and data rate you are trying to achieve? When GD is

I didn't display the phase, but since I had saved a couple of measurement sets in S2P format, I went back into NanoVNA Saver and loaded one and displayed the group delay (thanks for the hint about

Thanks, Soren! Yes, I can see that some shielding would probably be beneficial. This was definitely a "quickie" jig construction and I neglected a bunch of issues like that since I wasn't at all

The pc saver routine that works with the vna will do group delay measure and display.

David, thank you, very interesting! Did you measure phase? Interest in US FM has waned with the changes for HD that take out adjacent channels, and FCC coverage area equalization. Lack of geomagnetic

Hi, Thanks for sharing. I have worked with development of FM tuners for 10 years (1995-2005), so have a lot of experience in measuring these filter and characterize them mathematical. The group delay

Hello, This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group. * /Crystal measurements with the

You're not OLD - you're MATURE !! ;-) Glad it's working for you. 73 - Larry

You nailed, Larry! I happened to have one that came with my grandson's $49 tablet. I thought it was just a usb adapter. I'm glad I kept it. Never heard of such a thing says the 71 year-old guy.