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A couple more notes. The reference 3 for Z measurement is in the QEX article http://www.janbob.com/electron/AVNA1/Larkin-QEX-2018-May-Jun.pdf Also, there is a support group /g/AVNA1

It is a project, rather than an ebay buy, but http://www.janbob.com/electron/AVNA1/AVNA1.htm does a quality set of measurements from 10 Hz to 40 kHz. It is all open hardware and software. Note that at

Larry, Do we know if the clone bridges us the correct ferrites? I would stick with the transverters store version. < http://transverters-store.com/rf_bridge/rf_bridge.html> Order and active probe or

Both Correct. Per the Coilcraft datasheet, it's a regular transformer with primary and secondary windings, with high side isolated from ground. Nooelec calls it a "balun" (marketing?), but Coilcraft

Please, guys, when you speak of a 1:n transformer. always specify whether n represents voltage (turns ratio) or impedance. It is often not clear from context. Thanks, Dana

See msg #1252 Alan

You can homebrew a decent low frequency bridge and use a couple of opamps to accomplish the task. I posted the operation in another post message and with an LT Spice schematic. Will see if I can

Probably, but you'd have to change the mixer coupling caps and the bridge circuit.? ? ??Here's your chance to play and let everyone know if it works!? Also, the output is a square wave so you'd

Let me guess: no, it cannot be done. Rather use MLS with your PC soundcard. (Maximum Length Sequence) There are expensive commercial sytems like CLIO. http://www.audiomatica.com/wp/?page_id=1441 For a

Is there any possibility of customizing the NanoVNA software for a lower frequency range? Yup, I wrote lower. Aside from Ham radio HF applications, I would like to be able to characterize custom

If MCU is changed from original nanoVNA, then I guess also need change to NANOVNA_STM32_F072/board.h for BOOT_FROM_SYTEM_MEMORY_MAGIC_ADDRESS ADC1 address is buried in ChibiOS/os/common/ext/CMSIS/ST/*

Yeah, there is flux all over and it looks like someone learning to solder assembled it. \_('_')_/ Sent from Rogers Yahoo Mail on Android On Fri, 13 Dec 2019 at 9:51 am, Oristo<ormpoa@...> wrote:

I am not sure that makes it an effective balun. Or maybe at best a voltage balun, but not a current balun - which is what antennas require. As I recall, it is not possible to make a current balun,

Hi Larry - Sorry to learn that; I suppose only ones from Ukraine are better. Leaving 100 Ohm resistors NOT connected in parallel improves sensitivity for differences at higher impedances, but fixing

Hi Lajos I see you open phase is -0.22 degree at 250MHz and that equals 2.44ps delay. That look like you are suing the male open adaptor which in my calibration document gives has a offset one way

Its both 1:9 transformer with the 9 side not connected to ground -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK

No, at least in ttrftech firmware, only the first argument can be one of {start|stop|center|span|cw} It is sad (to me) that so much code is wasted on useless "flexibility".

Is it really a balun or a 9:1 transformer? Only a CMRR measurement would show that up. I find that today the word balun and unun are almost always used to describe a transformer with unknown CMRR

#83 : On the Doubtfulness Hello, Allow us, please, to announce that, as it seems, we may just found the deep source of doubtfulness and in the following way : we thought that we had to think

Hugen, Is there going to be a selectable USB/serial port PC I/O mode for this version with the new uP? ThanksLarry On Fri, 13 Dec 2019 at 3:18 AM, hugen@...<hugen@...> wrote: I've made