Passive filter for displaying scrambled TV channels

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Passive filter ????

hello
lately a friend got a small gadget that is placed between the TV antenna input and the antenna , this small gadget was able to filter certain scrambled channels to display a clear image .
im assuming this is a passive filter ,
have anyone used this before and is it a bandpass , rejection, high pass filter???
and if there is some schematics anywhere for this samll gadget
 

Re: Passive filter ????

It is most likely a notch filter that removes a strong spectral tone added to the video signal.

Do not ask for illegal hardware or design details on this site.
 

Passive filter ????

I'm not sure about, but I think it's a bandpass filter with a variable central frequency, that means that you can change the central frequency of the passing band to make this one less larger and then eliminate noise frequency.

I think that's the principe of that gadget, sorry for my english I'm studying in french.
Regards
 

Re: Passive filter ????

ok i just want to know what is this gadget i dont want any other imformation
and what is a good passive filter software design in the market
 

Re: Passive filter ????

Gadget is sharp reject filter. You can try Filter Solutions program.
**broken link removed**
I think they hawe 30days trial.
 

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