Your should have a look on:
http://www.ftatalk.com/showthread.php?t=10403&highlight=cable+filter
They are talking abotut these little "things"
QUOTE:
no! cable boxes are my specialty its a filter they try to sell u for alot of money but u could get the same thing at radio shack for $5.00 nobody has anything for digital cable to be descrambled if they say they do there full of it!
I agree with them. I've several filtrers like that for my scope measurements.
Providing that you know the cutoff frequency,you can buy that filter for cheap.
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