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
·
|