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Icom 7300 swr not reading
2
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
2
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
4
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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NanoVNA Sorts Unknown Ferrite Suppression Beads by Fair-Rite Products Corp.
37
NanoVNA Sorts Unknown Ferrite Suppression Beads by Fair-Rite Products Corp. https://www.youtube.com/watch?v=KmKQibSDzqM
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"Fake" NanoVNAs?
11
I was looking on Amazon and found a Black Friday sale for one, but the statement on the NanoVNA site about some being fakes and unsupported made me ask... is this one real? https://www.amazon.com/AURSINC-NanoVNA-H-Vector-Network-Analyzer/dp/B07Z5VY7B6/
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I have a RF choke in a TS-530S that I'm trying to test for induction and frequency. I saw the methodology of building a loop to go around a coil to read this. I really don't want to remove the choke, it's old and fragile. I made a partial loop, see image, and was able to get a frequency from it. I don't know anything about this, it was an experiment. Does anyone have a more educated idea about the test?
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Hello guys, I'm new here and I'm having a hard time figuring out how to use my NanoVNA to measure those things. I made a search in the group topics but it's always about the results and I can't really find any simple tutorial on how to take those measurements. - About transformers I would like to measure the ratio but I don't really know where to plug my nanovna to do that and how to configure it. I have "three outputs" primary, common and secondary. Should I use the 2 ports of the nanoVna to try and obtain a result ? - for the inductors I would like to know if I can just plug to the 2 ends of it and find it's value ? which value should I show on my display ? - for the trap filter I used the method where you just go through the inductor with a cable and look at the phase but I'm not really sure it's the best way to do it, can I just plus to A and B on my graph and look at the result instead ? If you have any link or video that shows the detail of the measurement and wiring process I'd greatly appreciate that. As I said I'm a new ham so I don't really know how to use my VNA except for measuring SWR of my antenna but I'm convince it's a great tool, I just need to learn how to use it.
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nanovna saver on saa-2N
6
Re-calibrating my H4 and my SAA-2N with Nano-saver and VNA-QT (VNA-QT on the SAA-2N only), , I find an issue with using the nanoVNA-saver with the SAA-2N that is dogging me. The saver works fine with the H4, but when connecting to the SAA-2N, on initial connection via USB the frequency range loads as 200-300MHz. I change it to the instrument width (10kh to 3000Mhz, it will not sweep, returns: " ERROR during sweep...stopped....argument out of range". Experimenting with frequencies, I find that I can sweep and calibrate in a range of 10mhz to 1000mhz, everything works fine, but if I either lower or raise the frequency outside that range, I get the same out of range error. Any suggestions would be greatly appreciated.
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Using a VNA to measure dipole antenna feed point characteristics has been discussed. I believe this is a little different twist. I have an attic mounted 1/2 wave dipole antenna with a 20-25 ohm Z0 at the feed point. I expected this because of the 12 foot attic mounting height, non-linear non-symmetric shape, near by structures, poor ground effect, other constraints, etc. Having confirmed this, how to best match this dipole's Z0 of 25 Ohms to a 50 ohm coax line is now the challenge. Would a 1:2 UnUn be appropriate? 1:2 BalUn? If so, what would this UnUn / BalUn look like? I have seen 2:1 commercial units available. The input and output connectors are for 2:1. I have not seen one with the connections setup for 1:2. If this is a viable are there any recommended commercial sources for it? I would then use the VNA to verify results. Thoughts and suggestions? Thank you. Bill WA2WIO
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Is it a viable method to do calibration of the VNA with a transmission line attached, so that when the DUT is attached to end of that line the measurements are true measurements of just the DUT?
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Hello, I recently purchased a nanovna s-a-a-2 (hardware version v2_2, 50k-30ghz, owocomm design), and after around 2 weeks of work the measurements on the s11 port decided to malfunction. At the time of the s11 port breaking a simple v dipole was connected to the s11 port of the analyzer, and the nanovna was plugged into a usb port on my computer, where i was getting my measurements from using vna_qt. After the malfunction I tried the following: 1) inspect my sma ports to make sure the little spring contacts weren't bent or out of place 2) connected all the different types of calibration loads directly to the s11 port with no change in any parameter 3) I connected a regular sma connector to both ports at once and observed the s21 logmag value change, which seems to imply that something is wrong with the s11 port only 4) disassembled the vna to check if there was some obviously blown up component (there arent any, even under the metal shielding) 5) cleared Please help diagnose and potentially fix this problem. I attached 3 pictures of the analyzer: one with no connections, one with the 50ohm load, and one with an sma connector connecting the 2 ports.
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Bugs in the source code of NanoVNA-D-v1.2.29
I was using the NanoVNA-D-v1.2.29 source code, and found that there is a bug in exti_v1.c. Because I added PA8 as an external interrupt, but when I enable the relevant code, I found that after triggering the PA8 interrupt, the program would go into an endless loop, and when I checked the code, I found that this piece of code is missing: EXTI->PR = pr; The problem was fixed with the addition of this piece of code
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Where in the H4 source code are MS5351m vs Si5351 configuration adjusted?
2
Where in the H4 source code are MS5351m vs Si5351 configuration adjusted?
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measuring gain of multi band vertival antenna (GAP Titan DX)
9
Has anyone measured or seen the gain factors for an antenna like the Tital DX. I have used one for 16 years, moved it to 4 different locations and it has never faild. But I am curious about its gain on the divverent bands and would like to get a measurement. Then may be I could see what is needed to improve it operationj. Any information as to what equipment would be needed and the procedures to follow would be appreciagted. Thanks. 73 Mike Wilson KE5WCT Daingerfield, Morris County, Texas (EM23ob)
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Audio frequency version of a NanoVNA
16
Is there any practical way to make a VNA that provides the same measurements over the frequency range of ~10 Hz to maybe 1 MHz? Is that something that could be done with computer or cellphone apps? I know that you can get FFT and scope apps, but I would like to see the Smith chart for an audio network and other parameters. Maybe with a variable normalizing impedance.... .... My Christmas wish list.
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RESET NanoVNA-F
Since I am on Windows Seven, I use nanovna-saver 0.3.8. My NanoVNA is DEEPELEC NanoVNA-F 4.3" HW2.3 HW3.1 Firmware 1.05 (Oct 31, 2022) I observe: 1/ To succeed, every time, the NanoVNA <-> PC connection, you must: - Start the nanoVNA - Connect the USB cable to the PC - Start nanovna-saver - clic [Connect] on nanovna-saver If nanovna-saver is launched first, it does not work every time 2/ Then, before any measurements or calibration, it is essential to do in the nanoVNA menu CALIBRATE RESET This operation is independent of the reloading of a previous calibration in nanovna-saver. The need for RESET on the NanoVNA surprises me. Why doesn't nanovna-saver (my version) do it itself? -- F1AMM François
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