This evening I connected a BCI filter that I have on hand, in the antenna path to my DC receiver. This is a unit I purchased a number of years ago from Industrial Communication Engineers. Model 402X.
The spec as follows:
BCB filter. 1.8Mhz - 30Mhz
50 Ohms, Non-Polar
Non DC Passive
Power capability is 300Watts.
The filter completely eliminated the BCI. Gone 100%.
This tells me that the BCI is entering through the front-end.
I can tell it is AM broadcast since the interference it is non tunable. A very loud Portuguese speaking station this evening.
I may consider building a BCB filter for my field project. However this will take up real estate and will need some kind of shielding to work properly.
|BCB Filter from Industrial Communications engineers.|