18-05-2022, 09:30 AM
(This post was last modified: 18-05-2022, 09:30 AM by Mike Watterson.)
If it has a tuning cap (mechanical or varicap) two wires may be for that.
Probe PCB where you think wires may have attached with a 2m+ long wire while powered on to LW. Possibly 20 t coil feeds that.
It's also possible the coil was made / designed for a transistor or low impedance RF input on IC, which would use 3 connections, one being a tap at 10 to 30 turns for RF in and the entire winding for tuning, but that actual radio only needs a 1mH approx tuning coil. Try the main winding of other LW ferrite rod coils.
Does it use ceramic filters for FM & AM as well as capacitive tuning (mechanical or varicap)? If so look at 16 pin AM/FM radio ICs. Otherwise it's DSP based.
Probe PCB where you think wires may have attached with a 2m+ long wire while powered on to LW. Possibly 20 t coil feeds that.
It's also possible the coil was made / designed for a transistor or low impedance RF input on IC, which would use 3 connections, one being a tap at 10 to 30 turns for RF in and the entire winding for tuning, but that actual radio only needs a 1mH approx tuning coil. Try the main winding of other LW ferrite rod coils.
Does it use ceramic filters for FM & AM as well as capacitive tuning (mechanical or varicap)? If so look at 16 pin AM/FM radio ICs. Otherwise it's DSP based.
