Hacking the KT0936m radio chip. Easy Radio Project.
I stumbled upon a radio board for sale that uses a KTO936M chip. It is an AM FM only radio board. But I noticed that it supports shortwave, but not configured for it. It was really inexpensive so I bought it, and I disassembled the board in order to test it out. I located the schematic, got the Datasheet and turned it into an AM FM multi band shortwave radio. And it is excellent. The distortion is very low and the reception is very good. It is available at all the usual places like https://www.aliexpress.us/. I bought a Rotary switch and added all the resistors I needed to make the band switching and it is awesome. The band switching is at the bottom left of the schematic, you switch the resistors to ground. Sometimes, you simply want an easy fun project. That is what this is. For about $10 or less. Got the precision resistors from Digikey (Yageo Data Sheet below)
Attached is an .STL file for 3d printing a prototyping / experiment base for the DSP radio module featured in this thread.
This model accommodates the DSP radio board and one 50 x 70 mm perfboard, or a 50 x 80 mm BusBoard systems SMD prototype board for the required external circuitry.
The screws used to affix the battery pack to the DSP board can be used to mount the DSP board to the base. No provision is made here for a battery pack in this model. Power is external. It is intended for experimenting on the way to producing a finished radio.
Win W5JAG