This converter has coils according to the reception and converted frequency bands. We found it in the October 1989 Radio Electronics magazine in an article that teaches its construction.
We found this circuit in the ON Semiconductor Thyristor Manual although similar configuration can be found...
We found this circuit in the June 1991 issue of Radio Electronics magazine. The integrated circuit is...
The integrated circuit used in this filter is not very common today, but the reader can use...