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If you carefully remove the for plastic screws you will have access to the screen cover. Simply peel it off and reassemble

Or use a Standard 5v USB Power Pack! Enough choices Up to 25Ah

I am in complete agreement. That was the point of my post. Unless the velocity factor is a lot more consistent than I would expect, that's all you'll be able to do with *any* TDR. And for practical RF

It's a tricksy little thing...the screen protector film is frequently UNDER the front bezel. You need to take the front bezel OFF before you can easily peel the film off using the handy green tab. 73,

So you removed the plastic film that is on the screen? Mike WY6K "... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

My screen tab is on the protective screen.

I don't understand all the theoretical limitations associated with different FFT sizes; but from a practical use point of view if my $50 device, as a additional throw-in, can measure a 65 meter length

The 900 MHz upper limit implies a sinc(t) width of 2.2 ns. A 256 point complex to 512 point real FFT will provide a long enough trace to reach the end of a ~50 m cable. The screen pixel count is not

Erik Congrats with your Call 73's Erik ON8DC

Rather than larger, I was hoping for wireless (Bluetooth), perhaps by ESP32, using a smartphone or tablet for display and complex calculations without USB and ground loop concerns.

Hello, Allow us, please, to inform you that, after: [15] : /g/nanovna-users/message/3147 we just uploaded our well-formed mathematical expressions of full-one port vna measurements

I'm talking about OUTPUT impedance of CH0 (don't confuse with INPUT impedance). I didn't hear that it is possible to measure output impendance with another VNA :) You're needs to measure amplitude on

I understand and thank you for answering.

In order to measure source impedance, you're needs to measure amplitude for different loads. Since many RF PA cannot handle open output properly you will need to use two different loads which

Never mind, figured it out. THanks if you looked!

Try this one: https://www.rtl-sdr.com/forum/viewtopic.php?f=4&t=4881 I also have more fresh with fixed some bugs and TDR screens.TDR VSWR works great, but TDR Z (step response) still not works

Thanks Neil. I downloaded 1.03 and everything seems to work except the smith chart won't draw on my PC. Data comes in on all modes. Is there an install process. BTW, I was in the process of designing

It is a screen protector that prevents the screen from getting scratched during assembly/storage, etc. peel it off if you want to

That green tab might be to disable the battery during shipping?? Sent using https://www.zoho.com/mail/ ---- On Thu, 26 Sep 2019 17:00:15 -0400 mike watts via Groups.Io <wy6k@...>

Mike, It's probably the cheap screen protector that's on it. Dave-KB1PVH Sent from my Galaxy S9 [email protected]> wrote: