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New Nano-VNA-H4 from SEESII User guide?
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Does a user guide exist for this model? It came with a flow chart but am looking for something more expansive on its functions etc.. Am a newbie at this device,
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Hi All I just have my New Nano-VNA-H4 from SEESII , i calibrate it on different spans and empty memory's, all seems working fine, but it does not save the latest recalled calibration memory , at startup it always open the first recall calibration, is this normal ?, How to save the latest recalled calibration for next startup . 73's Nizar
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Hi All, New to the group. I have a SAA-2N w/N connectors and cal set. With the necessary adapters (SMA to N etc..) I am not sure I understand if my measurements are correct. Measured (stimulus) from 1MHz - 100MHz; calibrated w/cal set. I then connected a 30db attn and it reads -25.6db @ 30MHz, what is going on? Note: this attn is marked 7-16.5GHz and is an SMA. (I have many of these attenuators and several tests on various units produces nearly the same results) Mike C.
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windows 10 allow NanoVNA saver to start without warning
3
I installed NanoVNAsaver (really just putting the .exe from the zip file from github on my PC). It works but gives a security warning each time it is started. I looked at file properties and didn't find any obvious way to fix this. How do I change settings to allow this to start without warning?
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Have watched several videos on this and they all seem to leave out most of the setup. Looking to measure inductance but most interested in self resonance frequency. Resonance will be about 2 MHz I am guessing. Have it across Port1/S11 as seen in the videos but don't have display of anything like in the videos. I have looked at the Absolute Beginners Guide but doesn't cover this.
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I realize this hardware is not made for this and results will be poor but I want to give it a shot anyway. New user of the H4 version. Looking to get some idea of signal strength of some local FM and TV stations. I tried setting the start and stop freq for the FM band and looking at logmag of S21 and got nothing - just an almost flat line near the bottom of the screen. Thinking I am missing a few settings. I have searched and read some but haven't found a complete list of settings needed. If I need to do this as some smaller freq bands I could do that.
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USB isolator suggestions?
25
Measuring balanced antenna feeds with the nano is easy if it is not connected to anything and well decoupled from "ground". It would be nice to remove the influence of connecting a USB cable to a PC so NanoVNA Saver can be used. I see two possible solutions: - a wideband RF 1:1 transformer on the S11 port - USB isolation of the RF path to ground The nice thing about USB isolation is that it should be possible to make it generically broadband and there are lots of isolators out there cheap. As one might expect, none of the inexpensive products (not fiber optic) say anything about parasitic capacitance on the ground side. Does anyone on this list have good/bad experiences with specific brands and models that show low coupling in the 3 to 30 MHz region? failing that, I'm thinking the RF transformer may be the best way to go. All thoughts welcomed! Brent, AB1LF
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#NanoVNA-H Firmware for 75 Ohm port?
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#nanovna-h
Is there firmware for the NanoVNA-H that supports selecting the port impedance (as is available on the VNA-H$)?
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Locked
HTML message editor not available for this group ?
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I'm not able to get the HTML editor when I write a message , also reply to messages from other users. This is happenig only on Nanovna-Users Group . Where I'm wrong ? Of course I set the preference on my profile. Thanks in advance for any suggestion . Best Regards Maurizio IZ1MDJ
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Crystal measurement scripting - UART readout
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Hello. I have a NanoVNA-H4, with DiSlord 1.2.40 firmware. I would like to write a python program to measure and sort crystals for use in a crystal filter. Is there a way to read out the parameters via the USB connection? I have tried to navigate the manuals and the help menu, but have not found anything if it is possible to read it out via USB. 73 de Thomas LA3PNA.
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Hi All Where to bye an accurate 50 Ohm +/- 0.1 Ohm SMA Load to ensure a good quality NanoVNA calibration ? Indeed the most important capability of a nanoVNA is to be calibrated by an external reference 50 Ohm load, the firmware with it's float point computing will do the rest, all quality or default of NanoVNA will be affected by the quality of the calibration Load 50 Ohm , if it has a large band resistor behavior without resonnance or parasitic inductors or capacitors and if it has an accurate resistor value to be refered to, i am not so sure that the loads given by NanoVNA vendors are very accurate , ohmetre measurement gives 50 Ohm +/- 1 Ohm wich is no so good . i would like to bye a better 50 Ohm load reference to be sure to have a good wide band value calibration . 73's Nizar
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What nanoVNA and from Where
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?Hello to all, After a couple of hours searching on web, I still don’t know much about what version of nanoVNA to get, from what manufacturer, and where to buy… I would like to offer a nanoVNA to my father for Christmas. The main purpose will be to teach him analysing RF transformers and antennas on HF and VHF, but I would like some precision and accuracy. Probably I am requesting too much, but, what versions should I look, made by who? I am in Europe, so it will be better to purchase from European stores or Chinese sellers on Aliexpress, I think. The screen size is not important because it will be used connected to the computer. On screen I see it can only perform 200 points of measure and on computer it can do 1024. Is not a nice rate but it is what it is. Can you please give me some recommendations? Thank you all in advance! Best 73 Pedro Madeira CT7AHV/C91AHV
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TDR function and setting the upper frequency - different results than examples I have found...
New user of NanoVNA H4. Bought it to tune some 500 MHz stub traps but sure I will find many other uses. Tried TDR function on a spool of coax and got factor of 2 difference on needed max frequency for the length (needed to lower frequency). Then I found another example that looked to double that (4 times what I ended up with). May just be some setting changes but would like to understand the differences or if I have just made some error. The example I was following is https://www.youtube.com/watch?v=9thbTC8-JtA They gave the approx. max freq as: Freq (MHz) = 5850 x vel factor/length in meters which for 250 ft (76m) and vel factor of 0.70 gives about 54 MHz I ended up at 31 MHz to just get the reflection pulse on the right side of the screen. The video has been up for a while and I found no corrections so I am guessing some setting is different but I believe I followed all the settings given. Any insights on this would be appreciated.
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Icom 7300 swr not reading
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?Hello guys, I’m repairing an Icom 7300 and I noticed an error on schematic. I would like to talk about that with someone experienced with this model. Can someone reply to me to discuss a little? Thanks! Pedro Madeira CT7AHV/C91AHV Pedro Madeira CT7AHV/C91AHV Mobile/WhatsApp/Telegram +351961966544
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Few month ago i buy SAA 2N from online, and today , im testing my dipole j pole antenna (im already tested few weeks ago, everything is ok, swr, impedance is ok ), but today...i don't understand why, the reading of this nanovna is off. then i charge the nano because red led on the unit is one led only....after the unit fully of charge, i turn on, and suddenly dead...blank black screen and battrey indicator is gone....led only one if i plug it to the charger...i try connected to pc, it's nothing happen. can anybody help me, and tell me what to do...
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pynanovna: A python module for NanoVNA
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Hello! I have created a general purpose Python API for NanoVNA. It is useful when you want to use a NanoVNA in a larger system. It is free, open source, and available to be installed with pip. It shares some code with Rune B. Brobergs NanoVNA-Saver. I think this is the first serious effort on creating a general purpose Python module and I hope that it will be useful to the community! Github: https://github.com/PICC-Group/pynanovna Best regards, Teo Bergkvist
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Installing DfuSe On Windows 11 ??
3
#bootloader
#dfu
#firmware
Hi All, I have a NanoVNA H4 with version: 1.1.0.1 firmware. I wish to upgrade the firmware using a '.dfu' file. To do that I would need to install DfuSe_Demo_V3.0.6 But have noticed when I plug in the device (in Dfu Mode), the driver for the STM32 Bootloader is not compatible with Windows 11. Question is, for the users who run a Windows 11 environment, how is a firmware upgrade on the NanoVNA performed? Pete DU7/VK4CCV
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Hi Hello, has anyone used this firmware for 75ohm, it is on a Russian forum http://www.cqham.ru NanoVNA forum I need an instrument only for measuring small lengths of rg6 cable, up to 20m, open, damaged and short Thanks
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STM32CubeProgrammer connection lost while updating firmware
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Hi, I have a NanoVNA H4 and before succeeded in uploading firmware 1.2.29 Now I try to do the same with v 1.2.40 but when the programmer starts after few seconds connection is lost (see file output log). Results in a blanc screen when trying to switch the NanoVNA on... --log-- 10:17:14 : STM32CubeProgrammer API v2.17.0 | Windows-64Bits 10:17:20 : UR connection mode is defined with the HWrst reset mode 10:17:20 : USB speed : Full Speed (12MBit/s) 10:17:20 : Manuf. ID : STMicroelectronics 10:17:20 : Product ID : STM32 BOOTLOADER 10:17:20 : SN : 205430672033 10:17:20 : DFU protocol: 1.1 10:17:20 : Board : -- 10:17:20 : Device ID : 0x0422 10:17:21 : UPLOADING OPTION BYTES DATA ... 10:17:21 : Bank : 0x00 10:17:21 : Address : 0x1ffff800 10:17:21 : Size : 16 Bytes 10:17:21 : UPLOADING ... 10:17:21 : Size : 1024 Bytes 10:17:21 : Address : 0x8000000 10:17:21 : Read progress: 10:17:21 : Data read successfully 10:17:21 : Time elapsed during the read operation is: 00:00:00.004 10:17:44 : Memory Programming ... 10:17:44 : Opening and parsing file: NanoVNA.H4.v1.2.29.hex 10:17:44 : File : NanoVNA.H4.v1.2.29.hex 10:17:44 : Size : 87.37 KB 10:17:44 : Address : 0x08000000 10:17:44 : Download in Progress: 10:17:45 : File download complete 10:17:45 : Time elapsed during download operation: 00:00:00.477 10:17:45 : Verifying ... 10:17:45 : Read progress: 10:17:45 : Error: Data mismatch found at address 0x0800523A (byte = 0x00 instead of 0xDF) 10:17:45 : Error: Download verification failed 10:17:45 : RUNNING Program ... 10:17:45 : Address: : 0x08000000 10:17:45 : Start operation achieved successfully 10:17:45 : Warning: Connection to device 0x422 is lost 10:17:45 : Disconnected from device. Any ideas how to recover ... Thanks, Phil ON4VP
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Why so many different names for the firmware .DFU files?
22
Why on https://github.com/hugen79/NanoVNA-H/releases/tag/1.2.27 there are there multiple options to download for NanoVNA-H? What is the difference between: NanoVNA-H-MS_20240220.dfu NanoVNA-H-SI_20240220.dfu NanoVNA-H-SM_ST_20240220.dfu ? The MS, SI, postfix, are those the type of the clock generator in the NanoVNA? How do I tell which one is for my device? (NanoVNA-H)
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Sat 8:39am
Sat 8:39am