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Re: LNA Design Using S Parameters
Thank you.
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Can you give a link or contact info? On Saturday, January 28, 2023, 08:52:41 PM EST, alan victor <avictor73@...> wrote:
A solution is found. I will be sending the notes to David Gleason at WORLD RADIO HISTORY. Along with 30 years of RF DESIGN MAG... They will all be scanned in and the resource avaiable to all interested. He does a superb job at recording these un avaiable docs and if you have precious stuff like this, consider looking into that method of preserving. |
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Re: LNA Design Using S Parameters
A solution is found. I will be sending the notes to David Gleason at WORLD RADIO HISTORY. Along with 30 years of RF DESIGN MAG... They will all be scanned in and the resource avaiable to all interested. He does a superb job at recording these un avaiable docs and if you have precious stuff like this, consider looking into that method of preserving.
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Re: LNA Design Using S Parameters
I have a scanner if the recipient doesn't.
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On Saturday, January 28, 2023, 06:45:02 PM EST, alan victor <avictor73@...> wrote:
Several replies and spoken for. Perhaps the document can be scanned to share by the recipient. I do not have a scanner. Thanks, |
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Re: "Bricked" after attempt to update FW
#nanovna-v2
#firmware
#crash
#newbie
#flashing
I feel your pain.. I had a similar occurrence with an alleged NanoVNA from an apparently Chinese vendor but shipped from stock in US. Although it was sold as a NanoVNA it was delivered with a NanoVNA-H firmware load that may have been modified. It could not be recognized in analyzer mode and registered as an unrecognized device. I was unable to get the driver updated.. So I figured I'd try a different fw load. IT was recognized in DFU mode and uploaded the fw but then I could not get the computer to recognize it in DFU mode. There was no DFU mode in the menu any more. I tried putting it in DFU mode by holding down the jogwheel when powering it up and also by using the jumper when powering it up. In both cases it gave the white screen indication of being in DFU mode but the computer would not even realize that it had been plugged in. To top it off the analyzer was messed up, showing SWR dips at the wrong frequency, as compared to the meter on my transceiver. I tried it on two computers with three different cables, all with the same result. Buyer beware - be sure you know what your hardware is before loading a new fw. I have also read that you need to run a command to clear the device prior to loading fw, but I don't know if that is necessary or even desirable.
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Re: LNA Design Using S Parameters
Frank Sweeney
Hi AlanWas that is the RF Data Book? Do you have an AN number or EB number.? If neither, I would like a copy
Fxsweeney@...? Tks and 73,Frank K9IC On Sat, Jan 28, 2023 at 2:02 PM, alan victor<avictor73@...> wrote: A 100 + page text with examples and data. Not available on the net. From a Motorola Design Course,? semiconductor division. Interested, contact me off line. 73' Alan |
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Re: "Bricked" after attempt to update FW
#nanovna-v2
#firmware
#crash
#newbie
#flashing
is it an stm32 or a gd32???
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dg9bfc sigi Am 28.01.2023 um 17:18 schrieb Ray WW0AW via groups.io: Good morning to all you good folks on this forum; |
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Re: "Bricked" after attempt to update FW
#nanovna-v2
#firmware
#crash
#newbie
#flashing
and some use gs32 intead the stm32 ... and some use a different screen (2.8 and 4 inch on the morket not counting in one unit that comes with? fat 7 inch display)
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and you will find units with an open fw or units with a special bootloader and a heavy different fw all need a "modded" fw to match the used hw so at first you have to know what fw you need for your device ... may it be a clone, cousin, sister or brother or a genuine unit (are they not all clones?!? no flamethrowings pease) dg9bfc sigi Am 28.01.2023 um 21:10 schrieb John Simons: Be aware that there are Chinese clones of the STM32 that may have subtle |
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Re: "Bricked" after attempt to update FW
#nanovna-v2
#firmware
#crash
#newbie
#flashing
Be aware that there are Chinese clones of the STM32 that may have subtle
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bugs in their implementations. It might just be trashed. -John Op za 28 jan. 2023 om 20:44 schreef Ray WW0AW via groups.io <hrpch= [email protected]>: Good morning to all you good folks on this forum; |
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Re: LNA Design Using S Parameters
Hi Alan,
I am interested. I do not know how to contact you off line, therefore my answer here. Kind regards Matthias www.dd1us.de -----Urspr¨¹ngliche Nachricht----- Von: [email protected] <[email protected]> Im Auftrag von alan victor via groups.io Gesendet: Samstag, 28. Januar 2023 20:02 An: [email protected] Betreff: [nanovna-users] LNA Design Using S Parameters A 100 + page text with examples and data. Not available on the net. From a Motorola Design Course, semiconductor division. Interested, contact me off line. 73' Alan |
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"Bricked" after attempt to update FW
#nanovna-v2
#firmware
#crash
#newbie
#flashing
Ray WW0AW
Good morning to all you good folks on this forum;
I bought it on Aliexpress and it's dubbed "S-A-A V2 Pro 4 inch GS-400" Worked fine for a number of years. Foolishly attempted to update FW to try to get 401 points... Bang crash !!! - White screen of death - "USB not recognized" (Device Manager) Broke out my trusty STLINK V2 dongle, identified SWDIO, SWCLK etc on the device and tried to reflash a new bootloader (using STM32 Cube Programmer , which does successfully identify the MCU - so it;s not "dead".) All attempts have failed - tried every bootloader under the sun - "USB not recognized" every single time STM32 Cube programmer can successfully flash the .bin files into the MCU but somehow the MCU doesn't respond appropiately. Tried to blink PA6, PA7 LEDs ( there are some empty pads on the PCB) without success (Several Blue pill's PC13 on the other hand respond perfectly) It's not the USB cable - tried several ones known to work fine on other devices. I'm stumped. Any help ? |
Jim Allyn - N7JA
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