Looking for a notch filter that doesn't knock out channels 64-77 - AVS Forum
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post #1 of 3 Old 01-30-2007, 06:53 PM - Thread Starter
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I want to modulate my TiVo as the Aux input to my Onq video distribution module. In order to do this I need to clear out some space in my Comcast (former Adelphia) digital cable lineup. So, I assume that means either a notch filter or a low pass filter.

Thus far I've found notch filters from
- On-Q notch filter (channels 2-4)
- Channel Vision notch filter (channels 64-70)
- Channel Plus parts (channels 64-70, 70-74, or 75-80)

The problem is, all of those ranges have channels I care about. (e.g. Sci Fi is 70, Comedy Central 77, local PBS and CBS affiliates 2 & 4 respectively)

I'd like a notch filter that works in the channel range above 77, which is my highest analog channel. Even better would be some way of knowing what frequencies my digital cable system uses so that I'd know whether a filter would stomp on digital cable or HD channels based on its frequency.

Any ideas for other notch filter sources?
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post #2 of 3 Old 08-19-2007, 12:35 PM
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did you ever come up with a sollution? I to want to know where my digital ch are. In the past I had to be concerned with my cable modem, but now FIOS takes care of the interent, but I'm still with comcast for TV.
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post #3 of 3 Old 02-01-2010, 06:03 PM
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If you have access to a spectrum analyzer, perhaps two or more (use in pairs per channel) of these would help:

http://www.rainbowkits.com/kits/df-222p.html
http://www.dewtronics.com/tutorials/...ter/df222.html

:-) neil
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