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Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware
At this moment no, USB work only as Serial USB Driver USB as Mass Storage Device not implemented
By DiSlord · #15199 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware
I think my SD card is recognized and is writing successfully (see below), but other than taking the SD card out, is there a way to get to the saved data? Thanks! Brian ch> S file CMD0 Ok CMD8 Ok CMD8
By Brian Garber · #15198 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware
Some si5351 chips can non stable work at 300Mhz (on datasheet max 200MHz) Tru reduce it maximum by set 290-301MHz: 'threshold 301000000' and wait result if not help reduce 'threshold 299000000' and so
By DiSlord · #15197 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware
I check it, but on H4 use longfilenames, and name + filecreation time some PS on H filename = filecreation time in Hex So 0x50ED8956 in binary =0b1010000111011011000100101010110 year 0b101000 + 1980 =
By DiSlord · #15196 ·
Re: Bettering the resistors' network on the RX input?
Anton That is quite a wide freq range. What kind if common mode Z are you looking for? You must maintain the characteristic Z of the RF path so coax wrapped around a core is the way to go. Bifilar is
By WB2UAQ · #15195 ·
Re: Bettering the resistors' network on the RX input?
Anton ask, I guess an attempt to create a decent CM-choke for the 50kHz~300MHz span would be DIFFICULT, more so for a wider span. Are there any engineering instructions on the topic? I don't know a
By Mikek · #15194 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware
Has anyone else noticed if the files saved on the SD card are at the correct time? I saved the data at 16:10 and the file is 17:10. I checked on the PC and smartphone. Both times, I have the same
By Igor - PY3IG · #15193 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware
Hi, a week back I got an H4, after initial playing with it I upgraded it to the v.0.8.4.7 fw. Nice! I see an issue with it, however. With fully charged battery, not connected to PC, CH0 terminated
By igor-m · #15192 ·
nanoVNA Saver exports s2p files with S11 = S21 #nanovna-saver
Hello, I exported some data from my nanoVNA S-A-A V2 using the nanoVNA saver software, but when I viewed the .s2p file, S11 values were the exact same as my S21, even though that was not the case in
By maramalnahhas@... · #15191 ·
Re: A test fixture for common-mode current chokes AKA 1:1 baluns #measurement
Yes, we somehow must measure with the balun choke "in place". Here is my practical approach (see my powerpoint): We can compare that in-place result with another measurement with no balun. From the
By DJ7BA · #15190 ·
Locked Re: The Uncertain Future of Ham Radio - IEEE Spectrum
All my life I have been interested in electronics. HOWEVER, I am severely dyslectic; so much so that some (not all) of my grammar school teachers thought me to be retarded. I entered high school as an
By Lawrance A. Schneider · #15189 ·
Re: Cheap preamps
If you don't mind a bit of home brewing; Mini Circuits has lots of surface mount pre-amps dirt cheap (<$3), such as: https://www.minicircuits.com/WebStore/dashboard.html?model=GALI-74%2B The only
By Brent DeWitt · #15188 ·
Re: A test fixture for common-mode current chokes AKA 1:1 baluns #measurement
Kevin Schmidt, W9CF, has written about measuring an antenna system's differential and common-mode impedances -- he describes it in the appendix of this article:
By Jeff Anderson · #15187 ·
Re: A test fixture for common-mode current chokes AKA 1:1 baluns #measurement
I had a crazy idea for the common mode impedance measurement (of the antenna/feedline system, not of the balun itself), although it could only work well at fairly low frequencies (say, well below 100
By Dana Whitlow · #15186 ·
Re: NanoVNA firmware user interface mod #mods
I don''t mean use SD card instead of flash, I mean just give the user the option to backup all the current settings to SD card, and restore back to flash if need be.
By OneOfEleven · #15185 ·
Re: NanoVNA firmvare, compiled by DiSlord #firmware
Hello there! I absolutely LOVE the v0.8.4.5 (on NanoVNA-H) for its' speed and general feel. I wish that firmware would be used as THE golden standard for any further development. Thanks, DiSlord, for
By ZAO · #15184 ·
Re: Bettering the resistors' network on the RX input?
Dear Cliffird, I guess an attempt to create a decent CM-choke for the 50kHz~300MHz span would be DIFFICULT, more so for a wider span. Are there any engineering instructions on the topic? Warm regards,
By ZAO · #15183 ·
Re: Notes on running NanoVNA-Saver on Linux #nanovna-saver
/g/nanovna-users/files/NanoVNA%20PC%20Software/NanoVNA-Saver/nvna-s-pve-rev-c.pdf Thanks for the LM20 test Nels. Just tested these instructions again with nanovna-saver-0.3.4 and
By Nick · #15182 ·
Re: NanoVNA firmware user interface mod #mods
You need them solve one problem: NanoVNA use interpolation then change frequency range/points count, made measure from PC command. And need original calibration data from flash for calculations. Yes i
By DiSlord · #15180 ·
Re: NanoVNA firmware user interface mod #mods
Also DiSlord, if the number of sweep points was reduced from 101 to I think 95 points it would allow each calibration save to fit into 4096 bytes of flash, which would free up 10kBytes of flash area
By OneOfEleven · #15179 ·