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I've tried installing DiSlord firmware version 1.2.40 on my NanoVNA-H4, but it seems to "brick it" Going back to 1.2.29 works. Ideas as to why 1.2.40 doesn't work? I've tried uploading it with the NanoVNA app and the DFU demo program. Same results with both. 73 Stan KM4HQE

Are there operating instructions for this VNA? The way it display data is different compared to my earlier and much smaller Nanovna. Dave

Screwed up the title. It pays to read before posting.

Southeastern VHF Conference 2025 Announcement & Call For Papers Quality Inn, 3095 Wilma Rudolph Blvd, Clarksville, TN 37040 April 4th and 5th, 2025 Papers and presentations are solicited on both the technical and operational aspects of VHF, UHF and Microwave weak signal amateur radio. Some suggested areas of interest are: ? Transmitters, Receivers, Transverters ? RF Power Amplifiers, RF Low Noise Preamplifiers ? Antennas ? Construction Projects ? Test Equipment and Station Accessories ? Station Design and Construction ? Contesting, Roving, DX-peditions ? EME, Propagation (Sporadic E, Meteor Scatter, Troposphere Ducting, etc.) ? Digital Modes, Digital Signal Processing (DSP), Software Defined Radio ? (SDR) Amateur Satellites, Amateur Television In general papers and presentations on non-weak signal related topics such as FM repeaters and packet will not be accepted but exceptions may be made if the topic is related to weak signal. For example, a paper or presentation on the use of FM simplex in contests or on the use of APRS to track rovers during contests would be considered. Formats: All submissions for publication in the proceedings should be in Microsoft Word (.doc or .docx) formats. Submissions for presentation at the conference should be in Microsoft PowerPoint (.ppt or .pptx) format and delivered at the conference on a USB memory stick. Please understand that your PowerPoint Slide presentation will not be accepted to be published in the proceedings; only meaningful text will be published in the proceedings, not slides that need description for understanding. Paper: Size should be 81?2 x 11-inches. Margins: Top and sides should be 0.75 inches; bottom must be 1 inch. Font: You may choose your font, however, try and use standard fonts. The font should be clean and easy to read 12 pt. Layout: Either a one or two-column format. Page numbers: Do not include page numbers. Headers/Footers: Do not include Headers and/or Footers. Drawings: Drawings should be embedded in the files. Place them where you’d like them to appear. Photos: Color or black-and-white digital images if utilized should be embedded in text files. Place them where you’d like them to appear. Printing: We print what we receive. We do not copy edit (but will correct something if we notice it – or if you notice it and let us know). We try to make all papers somewhat uniform, but we do not rework each article. Page numbers are added as we prepare the files for our printer. The deadline for the submission of papers and presentations is February 15, 2025. Please indicate when you submit your paper or presentation if you plan to attend the conference and present your paper in person or if you are submitting solely for publication. Papers and presentations are being handled by Mike Stipick, KC4RI, and should be sent to: KCRI@.... Mike may be contacted at the same email address if you have any questions.

I've looked online, and can find very little information on using an microSD card with this device. Can anyone who actually owns an H4 device let me know of any information they gathered (any links appreciated). They main thing I would like to do is save screenshots when out portable. Thanks

Hello I am looking to use my H4 to generate a signal on HF at -73db and -70db to do some calibrations after a firmware update on a my receiver. Some Nanovna have a tab called "Signal Generator" but the H4 does not (or I can't find one). I Can generate a signal on the frequency wanted by setting the start and stop to the same frequency and can hear the signal on the receiver but is it possible to somehow control the output precisely? It is possible to use the Power setting but they are preset and the only options are "Auto, 2mA, 4mA, 6mA,8mA" and not what I want. Thanks for any help 73 M0KCB

Hello David, The 40M leg is too long. The SWR and RL are rising with the increase in frequency. The 80M leg is too short. The SWR and RL are improving with the increase in frequency. HTH...Bob VK2ZRE

I'm having great difficulty navigating between drop downs on my NanoVNA-H 4 edy555 design version 0.5.0. First thing, I thought the first, 'about screen' disappeared after a short time, mine doesn't. If I tap the screen I get Display, marker, stimulus, etc. I tapped or held and got trace. format, scale, etc. Then I tapped Format and got trace 0, 1, 2, etc. that's not correct. Now tapping back only causes the grid to come and go with each tap. I did tap trace 0 and it did bring up the yellow Ch 0 in he upper left. But back just keeps cycling the grid on and off. If I tap back enough it finally goes back to Trace, Format, Scale, etc. I can not get format to show. It seems to know when the screen is tapped, but it doe not make the change as expected. Would a firmware update help this? Any thoughts? Thanks, Mikek

All, It's that time of year again when we need to pay the annual $220 fee to keep the group going. The payment is due the 18th and will be automatically paid by me. Once again I ask that anyone who can contribute a few dollars is encouraged to do so. Here are the guidelines: 1. Every donation is appreciated by the group. 2. I will keep a log of all donations in chronological order. Assuming that the donation total reaches the $220 amount necessary, I will let the group know that we have enough to pay the fee. 3. Any donations that are made after the $220 goal has been reached will be returned. I do not have a good way to bank or track excess funds. Excess donations usually occur because of emails crossing in time, or me just getting busy. 4. All donations should be paid to me using PayPal "Friends and Family" (I am not making any money on this, obviously). My PayPal account is the same as my email address - kc0wjn at gmail dot com. 5. All donations will be kept in my (non-interest-bearing) PayPal account until I have paid the fee, after which time I will transfer the donated funds to my bank account. 6. In the past I have tried to personally acknowledge every individual contribution. I'll try to do that again this year, but I may not be able to for various reasons. Thank you. Dave Daniel, co-owner -- This email has been checked for viruses by Avast antivirus software. www.avast.com

Hi All If it is really worth to replace the Chinese MS5351 by the Silicon SI5351a in my H4 SEESII Hardware 4.3_MS . Thanks 73's Nizar

Hello. I just wanted to ask if there is any interest from the community or the developers to make the menu easy for radio amateurs, for people that are not engineers? Currently the menu is a big mess with a lot of options and sub-options and so on. So if you want to make a simple measure, you have to go in many menus to change many settings. I know this gives a lot of control, but I will be very nice to have a few buttons on the main screen, like a main menu, that take you to the most used measurements, with all of the settings already set, with bigger font and a few buttons to change some settings only to that current measurement. I also do not know if this is something that the hardware supports.

Hi, I have been busy a few hours to try to upgrade firmware of my NanoVNA H4 to 1.2.27. Tried STMCube progammer 2.9.0, which usually is fine, with the correct 1.2.27 bin file, and get a black screen. Tried to use STMCube progammer 2.15.0 which is said to work, black screen. Tried NanoVNA app, after updating the driver to DFU, and 1.2.27 DFU file, black screen. Fortunately, I was able to get my NanoVNA H4 back in business by using STMCube progammer 2.9.0 and 1.2.14 bin file. The same day, I upgraded the firmware of my TinySA Ultra with STMCube progammer 2.9.0 without any issue. This subject has been debated, but if someone has an idea... Best regards and happy new year. Georges F6DFZ

Does the nanoVNA have a TDR function? For some reason I thought it did, but I can't find it in the menu. Zack W9SZ <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>