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A quick question on impedance. I'm using a NanoVNA H4 for simply checking SWR on antennas across the various amatuer HAM bands. It seems to work great. However, I've also been curious about the

picoguy, I infer that you have a class B push-pull amplifier you are measuring. S-parameters are by definition characteristics of a linear small-signal device. Any non-Class A power amplifier will

Some earlier versions of FW had timing issues. Use the latest HUGEN or DiSlord FW for the H4 and you should be OK.

Hi Rudy! Be sure to have the unit fully charged, and use a SD card max 32GB formatted with FAT32. Turn unit OFF, insert the card and then ON again. If you try to put it the wrong way, there is some

I have a new H4 with a micro SD port. The port polarity is not marked on the case but with a little care I was able to insert it correctly. However, when I try to save a screen plot I get "fail

1) The impedance of the primary, the collectors, is highly dependent on drive level from the previous stage. Looking into the 50-ohm port with the VNA even with the PP output stage properly biased but

Hope it now works for you. Please post any replies to this group instead of private email. That way others that search this topic later will have the full conversation. Roger

Here is the latest firmware for the H/H4 posted on the manufacturers (Hugen) github. https://github.com/hugen79/NanoVNA-H/releases DiSlord is the major developer of new firmware and his

Apologies, my original mail should have read: "I've had some issues with the output *transformer*, where..."

Hi, I'm in the process of building a BJT transistor based push-pull amplifier that I hope will develop 1 watt to drive a final power amp stage. The design is relatively common. It uses a pair of

Hi , Sometimes I have tis problem as well, mostly it helps when I delete the .ini file in NanoVNA-App's directory? restart the application and set my preferences again. Just my 2 cents, Joss. Op

Thank you, Robert. I just ordered one. Jerry ________________________________ Sent: Tuesday, December 14, 2021 8:21 AM To: [email protected] <[email protected]> Subject: Re:

Here is one with next day shipping: https://www.amazon.com/gp/product/B00L4PY754/ref=ox_sc_saved_title_8?smid=A118TZ4LLBWILH&psc=1

Wow - that is really strange that your unit works with old FW but not the newer FW. My last suggestion is to try to remove all references to the STM drivers and use USBDview to reset the USB devices

The latest version is V1.1 2021121 by Huge79/DiSlord.

Hi Thank you, Larry Rothman for your help. I'm sorry, but after trying everything, I give up. 1) installed the firmware version that you indicate to me (V1.0.69), also v1.0.71 and V1.1. 2)

That looks like Hugen's firmware. Actually 1.0.71 is available since last month

I'm sure that you can find something similar locally or on Amazon.

Roger, Came back in and checked eMail one more time. I have gone to both URL's and downloaded en.stsw-stm32102.zip and NanoVNASaver.x86.zip. Since I run Windows 7 32 bit, that looks right. will get

Hi All, My NanoVNA-H4 arrived from R&L today. It shows this version firmware. I "though" 1.0.69 is the latest version? 73 Stan KM4HQE Board: NanoVNA-H 4 2019-2021 Copyright NanoVNA.com based on?