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this maybe a oldie buts it is extremely powerful https://www.baudline.com/what_is_baudline.html

DL4YHF's "Spectrum Lab" (sound card data handler and spectrum analyzer) http://www.qsl.net/dl4yhf/spectra1.html looks a bit overwhelming at first, but it is really not that hard to use. It is very

Those well versed in the RF and microwave disciplines work with the 50-ohm impedance. Sure, the TV people work with 75-ohms, not much different. But for very high and low Z's, use the Smith Chart. It

You are not going to be able to improved reading of high impedance very much as the primary limitation is the 50 ohm impedance bridge and signal level differences get very small at the higher load

Don't forget about the free Android audio spectrum analyzer apps you can run on your phone or tablet.? They might even run on Chrome under arcwelder.? On Fri, 13 Dec 2019 at 5:16 PM, Bob Albert via

The applications (I've used more than one) that I've used in the past are pretty old by now, so I found this supposedly more recent list of free applications:

I will have to look around; do you have a link to a specific audio SA?? Basically I want it to measure distortion of an audtio oscillator. Bob

There are various free PC applications that use the sound card for an audio spectrum analyzer.? If you use a good quality sound card (flat response, low noise level) I would think that the results

It would be nice if someone would produce this unit for sale at a reasonable price.? An audio VNA would be great, as would be an audio SA.? I have use for the latter but it's not a common item. Bob

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/*