First log or maybe backlog, this is not the beginning:

When I got the china ARDF receiver soldered, then I needed some transmitter to test it - this was done in about 5 minutes:

pin header provides 3.3V power supply from the USB JTAG Adapter: pinout GND-spare-3.3V, at the RED arrow is SOT23-5 packaged MEMS oscilattor that I did pre-program to 3.510 MHz. Here another shot, the 2 pin header is GND and ANT output!

The "transmitter" IC is really hard to see!

Here the ARDF mini transmitter is powered, and I have 5 cm antenna also, this is not so efficient at 80m meter band, but at short distance it should work.

I am comaring the china Receiver with Zynq SDR seems the SDR has better sensitivity! Well for the SDR I used another piece of wire directly at ADC input, no filters or preamplifier was used.