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Re: NanoVNA port renormalization
Hi Don, Missed it. How to the response curves compare? Mike N2MS
By Mike N2MS · #39480 ·
Re: NanoVNA port renormalization
Hi Mike, Not sure you saw my most recent post as I switched to transforms earlier today to improve my dynamic range and posted pictures of the results. Don
By Donald Kirk · #39479 ·
Re: NanoVNA port renormalization
Don, I use construct resistive minimum loss attenuators for this application but keep in mind the attenuation decreases the dynamic range of the measurement. Mike N2MS
By Mike N2MS · #39478 ·
Re: NanoVNA port renormalization
Sorry, here are the attachments per my previous post. Don
By Donald Kirk · #39477 ·
Re: NanoVNA port renormalization
Hi John, As Nizar mentioned renormalization is not available on my NanoVNA which is the NanoVNA-F. This morning I decided to improve my measurement dynamic range so I replaced my L pad matching
By Donald Kirk · #39476 ·
Re: NanoVNA port renormalization
Don, I didn't do that for this test, but at some point in the past I did all that. I had unknown crystal filters and used the NanoVNA renormalization to find the Z that gave the best looking response,
By John Gord · #39475 ·
Re: NanoVNA port renormalization
Hi Donald I think what you have done physically with your Deeplec Nano-F is almost what is done by jhon but with H4 and z port renormalisation and physically cute & short connection with optimised
By Team-SIM SIM-Mode · #39474 ·
Re: NanoVNA port renormalization
Hi John, I'm a little late to the party but this topic peaked my interest and my thinking is very much aligned with Rogers. I think the one comparison test you are missing is what filter response
By Donald Kirk · #39473 ·
Re: NanoVNA-H4
To measure insertion loss, you connect the channel 1 to the common port of the diplexor and channel 2 to one of the output ports while terminating the unused port with a 50 Ohm load. Move channel 2 to
By Gary W9TD · #39472 ·
Re: NanoVNA-H4
Hi Joe You seems need an S21 Logmag measurement , Knowing that dynamic range of H4 on the UHF are limited to 50db you should not expect more then -45db values for the isolation measurements between
By Team-SIM SIM-Mode · #39471 ·
NanoVNA-H4
I have a NanoVNA-H4, I have no problems checking antenna SWR etc. But what I want to do now is to check the performance of a "Diplexor" You know one of these things that splits/combines a 2 meter and
By Joe WB9SBD · #39470 ·
a little confusion in vision between 0 and 8 on the display
Hi May be not a very objective vision, it seems to mee that there is a little confusion in vision between 0 and 8 on the display, with SEESII H4 + DiSlord 1.2.40 , I prefer a simple 0 graphic display
By Team-SIM SIM-Mode · #39469 ·
Re: NanoVNA port renormalization
Hi PY2CSH For me per example , I prefer set Z port 1 to 75 Ohm virtually and keep Z port 2 to 50 Ohm as it's physically , so it can be very handy option for who need it . 73's Nizar
By Team-SIM SIM-Mode · #39468 ·
Re: NanoVNA port renormalization
? ... I personally don't see the need to have different Z for the input and output of a DUT. ... ? How about a matching network, say matching 50 to 20 ohms?
By PY2CSH · #39467 ·
Re: NanoVNA port renormalization
Roger, You are correct. There is no added matching circuitry. It's all math. The physical connections are the same for both plots. --John
By John Gord · #39466 ·
Re: NanoVNA port renormalization
What NanoVna are you using ________________________________ Sent: Sunday, February 9, 2025 10:57 PM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] NanoVNA port
By CLIFTON HEAD · #39465 ·
Re: NanoVNA port renormalization
For those interested there was a long (over 300 posts) discussion of how to measure ceramic filters in another group about 5 years ago.
By Roger Need · #39464 ·
Re: NanoVNA port renormalization
Maybe I am interpreting this incorrectly. Your comparison shows with PortZ = 50 and PortZ = 430. The Smith Chart marker shows almost the same input impedance in both cases so it appears you did not
By Roger Need · #39463 ·
Re: NanoVNA port renormalization
Rather than prioritizing new feature development for the NanoVNA, I would prefer to see some integrity/troubleshooting functions build in. Things like checking for internal shorts, component values
By Steve Johnson · #39462 ·
Re: After firmware update my nano-vna-h is behaving bizarrely.
Yep...Just went through this myself. Mine was an MS version and dislord 1.2.40 defaults to SI. Bryan, n0luf
By Bryan Curl · #39461 ·