Hi Wolfgang, The flickering problem originates from the fact that the SDRAM (which is used as LCD frame buffer) is connected to the bus with 16 bits instead of 32. The entire screen image is sent to L

Hi Mikko, I am in the village since April, working remotely, enjoying gardening and operating the radio. But my electronic workbench is in the city, so I cannot make any hardware. Maybe later.

Hi ON3TVA, Is USB FS PHY still available? If it is, you can build the original firmware from the latest sources (https://github.com/EU1KY/eu1ky_aa_v3), with redefined USE_USB_HS to USE_USB_FS (either

#poll

Hi Wolfgang, One more interesting feature has been added to my version (H745 code, and EU1KY branch of the F746 code): open line Z0 measurement. The algorithm is simple: it finds the frequency of the

Hi Mikko, Suspecting SDRAM memory corruption on the board. Maybe some line is badly soldered. Debugging can show what is in calibration tables, and what bit is exactly damaged.

Great job, Mikko.

Hi Carlos, I am using SimSmith very often, it's very useful software for me. The example of RigExpert protocol is at https://rigexpert.com/uk/products/kits-analyzers-uk/aa-30-zero/getting-started-with

Currently the frontend is the same as before, and the firmware is very similar to 3.0.

Hi Wolfgang, It has been increased to 3.1d for H745. 73! пн, 10 февр. 2020 г. в 13:01, Wolfgang Kiefer <woki@...>:

Hi All, I've just ported the AA code to STM32H745I DISCO board which is very similar to F746G DISCO, but has more features: double core SoC with higher clock speed and more internal memory, built-in e

AntScope2 tries to auto detect devices. It repeatedly changes the baudrate between 38400 and 115200. Unfortunately, the onboard ST-Link virtual serial port cannot handle this switching properly, it si

Hi Anthony, S21 should be a pure input used to measure signal level. The signal comes to it from the DUT output.

Hi All, Consider the coax cable loss. The longer it is, the better SWR you observe. If you take 500 m of unterminated poor thin coax, e.g. RG-58, it will show SWR of 1.1. But all the power you put int

Hi Mardin, I did exactly the same, works fine. NiZn ferrite is manufactured at much higher temperatures. It can be irreversibly damaged either mechanically or with extremely strong magnetic flux (e.g.

Hi Jesus, In order to measure electrical length in degrees, just connect you open-ended cable to analyzer, and look at the Smith chart at desired frequency. Measure the angle between the horizontal li

Hi Dan, Interesting idea! I will try to model this approach in Python + numpy. But maybe not for this particular project: This device is not a lab grade VNA. First of all it is just a good antenna ana

Hi Martin, I think the diodes are not really needed. Some people reported that they affect precision above 200 MHz, though I never observed this effect, probably caused by diodes quality. I don't use

Hi Chris, Yes, only this method is correct.

Hi Chris, The DUT impedance transformation caused by stray capacitances, inductances and transmission lines (like pigtail) can be presented as a quadripole and can be effectively excluded by OSL calib

Hi Wolfgang, Just look at the curves for magnitude ratios (Ua/Ub) versus Z measured with EU1KY and NanoVNA bridges in 1...1000 Ohm range (see the picture attached). As you can see, NanoVNA produces al