ATS Mini 50kHz LW (for ESP32/SI4732)

[Blondi1]

"I am looking for a compiled .bin file for the ATS Mini 50kHz LW (for ESP32/SI4732). I do not have the necessary environment (Arduino IDE/PlatformIO) to compile it myself."
Can someone help, needed for 2200m band?

[DB9JG]

Isn't there a 144kHz hardware limitation of the lowest RX frequency with the DSP IC Si4732?

[Blondi1]

The official documentation for the Si4732 DSP IC usually states that it supports Long Wave (LW) from 153 kHz to 279 kHz. ​However, some Si4732-based receivers, especially those with added capabilities (eg using an SSB "patch" or special firmware), claim to be able to receive below 153 kHz, even up to 9.9 kHz. These are usually extensions of functionality that are not part of the original chip specification. ​Admittedly, 144 kHz is below the lowest officially supported frequency for Longwave (153 kHz), but technically it is not the absolute lowest hardware limit of the chip, as some implementations can set it to run even lower.

[DB9JG]

There is a firmware with a RadioScript interpreter language by H.J.Berndt. This allows to set all registers of the SI4732 manualy respectively by the program script. May be this is the right playground for your experiments ?

[DB9JG]

https://peterneufeld.wordpress.com/2025/10/07/radioscripting-with-si4732-miniradio/

[Blondi1]

Можете лако сами направити прилагођену верзију фирмвера (погледајте видео туторијал https://esp32-si4732.github.io/ats-mini/development.html ). Нема потребе за инсталирањем развојног окружења. Ограничења опсега су дефинисана у следећој датотеци: https://github.com/esp32-si4732/ats-mini/blob/main/ats-mini/Menu.cpp#L53

Thanks for the help, I'm trying to find anything related to going below 150khz, has anyone already tried it so I don't waste my time on it since I'm not particularly expert in this regard. 73

[DB9JG]

I use a homebrew VLF upconverter with my Kenwood R600 similar to this one:
https://www.pa3hcm.nl/?attachment_id=1245
My version utilizes a 16MHz quartz oszillator

[Blondi1]

Very interesting vlf-converter scheme, if you are satisfied with the creation of the same I can build one tomorrow, I think this is the best solution, thank you for the scheme and I hope it will work well.73

[Blondi1]

I installed a simulator on the analyzer - 130 KHz passes through, I will install a switch to activate another filter or an oscillatory circuit and a signal of 10khz.