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first time trying to use the nanovna H4. Not sure how to correct this error. Any help would be greatly appreciated.

I'm assuming this is bogus but could someone confirm the legitimate site for NanoVNA? From edelswartz123@...: Hi, I just noticed the "NanoVNA" link on your page:

Hello tjackson382000. 10 inches is a stretch for ISO15693, but out of the question for ISO14443. I like the Feig CPR74, which puts out 250 mW. It's a module with onboard antenna and a u.fl for

In the early days right "off The Hill" we had both 915 MHz and 2.45 GHz passive (beam powered) and active (coin battery) tags. The present-day SAW RFID tags are beam "powered". That was developed

It is no problem to read 10" with 125 KHz or 13.56 MHz, but you'll need large antennas. I'm not aware of any (passive) 2.45 GHz RFID system on the market now. Had a Motorola system long time ago.

There are a variety of apps for phones that will interrogate the card and read it back. You can watch the activity on the TinySA.

Bob Witte wrote the referenced book due to the requirement of EMC testing. Any accredited lab must present measurement uncertainty of the lab in any RE test report. Without that, the report is not

Frank: Thanks for the tip about Bob Witte’s books. Chuck KF8TI

Chuck, Take a read of Bob Witte’s measurement equipment books, written when he was at HP. Joe Carr’s tests and measurements book is another one rendering a cogent treatment of measurement errors

If you need 10"+ reliably, use the 950 MHz or 2.45 GHz system at lower power, not these inductively coupled systems. Dave - W?LEV

The whole goal of the LF inductively coupled RFID systems is very short range. 10" is a stretch for these systems in normal applications. If you want more range, make the coils physically larger while

Yep! That's in an MF ISM band. If one has a Metcal soldering implement, it also operated in this band. Those having a TinySA, this offers an easy "target" for checking MF operation. Dave - W?LEV --

Thank you ________________________________ Sent: Wednesday, June 15, 2022 6:45 PM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] NanoVNA for RFID design A good use

Exactly - there are document management systems that put RFID stickers on each page or folder of the paper document (think mortgages and similar docs).? Then they have a reader that goes in front of

A good use case is where you use the badge to authenticate into a computer (using an actual contact badge reader that uses the cryptographic chip in the badge), but then just need to make sure that

TY ________________________________ Sent: Wednesday, June 15, 2022 5:04 PM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] NanoVNA for RFID design Things like

RFID expert here. I had a quick look at the AN. It is quite complex to grasp in 60 seconds. I did some 13.56 MHz antenna design before, but these were all for a 50 Ohm system impedance, so you can

Things like automated package/baggage sorting use RFID at times, and distances to objects on a moving belt canrequire this kind of reach. - Tim

But why would anyone want an RFID reader that can read cards over 10" away except to read someone's Credit card or Debit card without the person knowing about it... then you just watch them type in

True. Antenna is a misnomer, and the tag and reader coils act together as a 'loosely coupled transformer', I think is a proper term. And yes, the ISO 15693 standard includes a 13.56 MHz carrier. The