Recently, you can buy interesting AM / FM tuner modules on the TEF6686 chip. Such a module costs about PLN 100 and is sold as an FM head for car radios. It has amazing possibilities, great sensitivity and selectivity, adjustable de-emphasis and filter. The module is already output analog audio L + R, or MPX, depending on the configuration.
The device consists of a microcontroller atmega328 with a program that translates the i2c communication with the tuner and issues via uart. You can use the xdr-gtk program to control, I think that a lot will be explained by the movie on which I make a rather slow band-scan, in the background an open page maps.fmdx.pl where you can quickly and easily verify what and where it comes from.
The antenna used in the film is a dipole installed in the V polarization on the roof of a four-story block, more precisely on a pipe from the former azart installation, plus a 40 m cable.
The housing comes from an old, damaged vga-composite converter and the holes for the sockets fit perfectly.
The tuner itself looks like this:
Wiring diagram:
There is also the possibility of remote operation of the tuner, you will additionally need a raspberry pi and a sound card with a line-in connector, then the tuner itself can be installed in a convenient location and used without delay via the Internet. I have such an installation on a 70 m chimney, the xdr itself is publicly displayed so everyone can have fun.
The necessary programs are here: http://dktr.pl/XDR
There is foobar2000 configured to have as little audio delay as possible and an item with stream address added. There is also the xdr-gtk program, to connect you need to enter the hostname dktr.pl and the password 12345 and you can shoot.
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