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Using the H4 as a Signal generator with
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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
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40M X 80M NVIS Antenna for WFD event Jan 25th.
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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
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Touch screen does not respond well.
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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
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Hey, I wired up a 118' X 68' crossed dipole antenna per the recipe here https://w8jxn.org/?p=1650. I was able to get very good transmission 5x9 to a collaborator some miles away on 3.915MHz. The 40M leg seemed more difficult. So I hooked up my Nano VNA-H to the Feed Line. I set the calibration plane at the input to the VNA. The network is 75' of RG58 to a 1:1 Unun, then the Antenna. NVA Sweep Results attached. I didn't fuss with markers, or other settings ... What do the measurements suggest? I have some opinions, but thought to listen first. My goal is to tune it up a bit for Winter Field Day... Enjoy, and thanks in advance for any thoughts you share.
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Annual Fee
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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
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The file saved after taking a screenshot of the SD card was blank when I copied it to my computer and opened it.
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Fresh out of box. A sweep of my DIY 10M antenna... S1 - connected to 50' Rg58 via BNC connectors to my 10M dipole. The lowest piece of which is about 12' off of the ground. I set markers a L, M and H points of the band. S2 port had nothing connected. The VNA was calibrated just prior to the sweep. An anchored via USB to my Windows tablet. Now I'm digging into how to read the Smith Chard and return / impedance info... Comments please!! Do I need to update VNA firmware or make other changes. Software on the tablet? What's next folks?
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Has anyone ever tried using the CW output feature to generate a carrier for reception of SSB (LSB/USB) on a cheap shortwave receiver that can only receive AM mode signals? It seems like this should be thoretically possible by attaching a small whip to the nanoVNA and placing it in the vicinity of the receiver. But probably tricky to get the exact frequency dialed in, as well as the signal strength relative to the sideband signals. Just seems like a fun radio exercise or for an emergency need.
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SI5351a Vs MS5351
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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
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Possible easier menu for radio amateurs?
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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.
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Unable to upgrade firmware to 1.2.27
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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
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I am thinking to build discrete circuits for a specific non-resonant antenna to operate on HF bands without a remote tuner. I managed to snag one of the last MFJ-948F Versa Tuner II left in stock. (But, that's an indoor tuner. I want the tuning done at the base on a non-resonant antenna.) On a nice day thinking to bring the new tuner right to the base, tune it up for a few frequencies within each band. How could a NanoVNA gather values set on the tuner? Seems so possible to use a few parts and do this outdoor tuning in advance and for increased power. Smith charts are used for this matching. But, I don't know how to read discrete values from the Smith Chart on my NanoVNA. I suppose I could also open up the tuner, use meters for the measurement and build the same. Whatever, I am sure that my NanoVNA will confirm whether the tuning is correctly after an individual network is made. Please lead me down an easy path? Maybe I just need to buy a book and learn this? Paul - KY4XJ
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TDR function?
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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>
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Querry a tuners' settings for L&C with a NanoVNA
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Is there any way to determine a tuners L and C settings/values such that a fixed PI network could be built to replace the tuner. Case in point. I have a QCX and the 50w amp which exhibits a mismatch between the two. I have set my qrpguys tuner in between and tuned it. Now I want to build a tuned circuit with a toroid and caps to replace the tuner. I'm sure there is a better way but ,,, Bryan N0LUF
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Measuring GPS antenna bandwidth
9
I am building a high accuracy RTK locating system to measure my property lines and the location of buildings on the property. To achieve centimeter accuracy, it uses signals from multiple locating satellite constellations on a range of frequencies between 1164 MHz and 1610 MHz including those used for American GPS. I have several GPS antennas, including a couple from high end Trimble survey systems but am unsure if their frequency response extends far enough beyond GPS frequencies and how flat the response is. These antennas have built-in LNA's that utilize 3VDC supplied by receivers via the coax. The antennas and the LNA's need to be tested to ensure the system meets the bandwidth requirements. Some of them can be broken down to access the antenna & LNA separately but I'm unsure how to inject the necessary LNA DC power without impacting the nanoVNA measurements. Does anyone have recommendations for testing antennas with built-in LNA's? Regards, George
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Software for Android
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Hello to the group and a very happy holiday to all, I am trying to find an app that will work on my android phone or tablet, the software in the wiki claims it is for an older version of the android OS so it won't even let me download it. So the question is if there is a newer version somewhere, or do we need to update the wiki to show that it only works on older devices? Greg
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MTG.I
Aldo, I think this was for: /g/MSG-1 73, David GM8ARV -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email: davidtaylor@... BlueSky: @gm8arv.bsky.social, Twitter: @gm8arv
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Hi all Testing NanoVNA App + Windows11 with My New H4 , it seems almost working ok despite some bugs and crasching, but my main problem is : i do not found the new Dislord Coax functions, indeed i am using again this days the RG59 75Ohm coax it has less loss coeff then the RG58 50Ohm Coax measured by to the Dislord coax functions on H4, it has a measured 77.70 Ohm =Z0 specific impedance , and then i measure the SWR and Smith with 50-->77.7 Ohm Dislord conversion function, all seems amasing With H4, Wonderfull Dislord functions , but still no success to do it with NanoVNA App and PC+USB . 73's Nizar .
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Newbie here. I am interested in testing antennas for resonance and swr. 80m to 70cm. Both indoors and outdoors. I was thinking of buying an entry level antenna analyzer. Several helpful people suggested getting a nanovna instead as it was said to have a cheap price ($60ish) and extensive capabilities. After reviewing Amazon and eBay for nanovna I don't see much in that price range (at least double and more) and I sense from reading material here and there that there will be a lengthy learning curve with no guarantees it will work for you. Plus it's not obvious which one of many nanoVNA offerings to buy with all sorts of illegal clones and firmware issues abounding. Not really like that with store bought antenna analyzers -Price and features laid out. An I missing something?? Appreciate input. Edward
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I received the RF Demo kit for NanoVNA. The cables are indeed fiddly to attach on the pcb board, but I am getting used to it. Just hope that it will last for some long time rather than get mangled, and ruin my investment for the learning. Anyhow I got it to calibrate OK for Open, Short and Load with the Demo Kit board and supplied cables. But when I tried to read for the 30Mhz Band Pass Filter, the readings on the screen didn't come out what is indicated on the board. It was more squiggly curve type graphs on the display. I tried to change the settings with the SPAN and SCALE in the menu, but it made it actually worse or was just showing straight horizontal line. Could someone please explain, what settings the VNA must have to display nice sharp dip of the graph as on the board? What am I doing wrong. I understand the RF board is showing how the band pass filter on the board is blocking the all other frequencies and only letting in 30Mhz in the filter? What should be the settings in the menu of the VNA? Thanks
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Sat 8:39am
Sat 8:39am