Low-pass filter?? - Router Forums
 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 11-07-2013, 11:17 PM Thread Starter
Registered User
 
rwl7532's Avatar
 
Join Date: Sep 2011
Country: United States
First Name: Ralph
Posts: 1,288
 
Default Low-pass filter??

I have Comcast cable for watching TV. I just added internet service but now my 60" Panasonic Plasma TV no longer correct interprets the cable signal.

I'm told I need a low-pass filter and that will get me back to how it was before the internet was added.

I had HD reception interpreted by the TV without the need for a cable box. Only certain channels (4-1, 5-1, 7-1, and the all important Seahawks channel of 13-1 among others) were interpreted. For channels like CNN and Fox News (44 & 48) I still needed the cable box.

What low-pass filter should I get?

  • Accident free since 10/27/12 at 3:58 pm.
  • Cursing free since 10/27/12 at 3:59 pm.
  • ...it happened in Everett, WA USA
rwl7532 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 11-08-2013, 11:21 AM
Registered User
 
Join Date: Jun 2011
Country: United States
First Name: Duane
Posts: 1,709
 
Default

Ralph, I'd ask your cable provider what they recommend. Every system is different and they will/should have the best answer. They may even provide what you need at no cost to you.

Unless Comcast is pushing channels on non-standard frequencies, you should only need a cable box for scrambled channels. Also splitting the cable for the modem may have lowered the signal strength to the TV. This can be especially true if you are splitting it for several tv sets/devices!

I have on occasion seen compatibility issues between some models of tv set and cable systems. Canton, Oh's system with Samsung comes to mind. All the more reason to contact Comcast.

Who suggested the low pass filter? The bandwith of such a filter would depend on what it is you are trying to reject. Without more info I would not even want to guess!

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

I don't suffer from insanity. I enjoy every minute of it.

Last edited by Dmeadows; 11-08-2013 at 11:35 AM.
Dmeadows is offline  
post #3 of 9 (permalink) Old 11-08-2013, 12:02 PM Thread Starter
Registered User
 
rwl7532's Avatar
 
Join Date: Sep 2011
Country: United States
First Name: Ralph
Posts: 1,288
 
Default

My son who has installed many plasma TVs suggested the low-pass filter.
Later he sent email stating "DC - 6/800Mhz" (always the cryptic one, my son)

When I chatted online with Comcast support, they said they don't supply filters.
I have the phone number to the Comcast location nearest me and I'll call them.

Yes, I have a cable box and I can view programs using output from it but prior to the addition of internet service, the Panasonic Plasma TV was able to de-encypt some channels (some in HD).

  • Accident free since 10/27/12 at 3:58 pm.
  • Cursing free since 10/27/12 at 3:59 pm.
  • ...it happened in Everett, WA USA
rwl7532 is offline  
Sponsored Links
Advertisement
 
post #4 of 9 (permalink) Old 11-08-2013, 12:55 PM
Registered User
 
Join Date: Jun 2011
Country: United States
First Name: Duane
Posts: 1,709
 
Default

Here is a fairly inexpensive one..

Channel Vision 3102-105 Low Pass Filter, Blocks CATV Channels Above 105 - HomeTech Solutions

Will block anything above ch 105. Good luck!

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

I don't suffer from insanity. I enjoy every minute of it.
Dmeadows is offline  
post #5 of 9 (permalink) Old 11-08-2013, 02:28 PM
Registered User
 
Join Date: Apr 2013
Country: United States
First Name: Bruce
Posts: 211
 
Default

If your Cable and internet come over the same cable system (Comcast) it is up to Comcast to fix the problem. Read the FCC type Acceptance on the cable box and cable modem, it spells out what kind of interference is allowed and who is responsible.

Bruce
CAD-Man is offline  
post #6 of 9 (permalink) Old 11-08-2013, 02:38 PM
Registered User
 
Cochese's Avatar
 
Join Date: Jan 2010
Country: United States
First Name: C
Posts: 859
 
Default

Comcast in my area has to have all channels interpreted by a digital box.

Is your modem split off as it enters the house and not on the branch going to this TV?

The 144 Workshop - Ambitious but rubbish woodworking
Cochese is offline  
post #7 of 9 (permalink) Old 11-08-2013, 05:16 PM Thread Starter
Registered User
 
rwl7532's Avatar
 
Join Date: Sep 2011
Country: United States
First Name: Ralph
Posts: 1,288
 
Default

Quote:
Originally Posted by Cocheseuga View Post
Comcast in my area has to have all channels interpreted by a digital box.
Comcast wants users to think this is the case.
Modern TVs (my Panasonic plasma in this case) can interpret the cable signal and present additional channels.

For instance, channel 4 requires the cable box, but my TV presents 4 (scrambled) and 4-1 in HD unscrambled.

  • Accident free since 10/27/12 at 3:58 pm.
  • Cursing free since 10/27/12 at 3:59 pm.
  • ...it happened in Everett, WA USA
rwl7532 is offline  
post #8 of 9 (permalink) Old 11-08-2013, 07:09 PM
Forum Contributor
 
AxlMyk's Avatar
 
Join Date: Jun 2006
Country: United States
First Name: Mike
Posts: 3,165
   
Default

Channels such as 4.1 are OTA channels, and by law, Comcast is required to carry them for free.
If you had an antenna, you would be able to pick them up, in full HD.

.
Never, under any circumstances, combine a sleeping pill and a laxative on the same night.

Mike - Retired FoMoCo Tradesman
My Gallery @ http://www.routerforums.com/axlmyks-stuff/
AxlMyk is offline  
post #9 of 9 (permalink) Old 11-08-2013, 08:18 PM
Registered User
 
Cochese's Avatar
 
Join Date: Jan 2010
Country: United States
First Name: C
Posts: 859
 
Default

This is a change from when I checked last then. I couldn't get them before, and now I can. Everything else is the same. Not a real benefit over the free boxes that I have, though.

But again, you need to make sure the modem is split off the TV lines. I have no filters and don't have any issues.

The 144 Workshop - Ambitious but rubbish woodworking
Cochese is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Router Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Do others do this (research)? > Dust Collection MAFoElffen Tools and Woodworking 61 08-27-2013 06:38 PM
Dust Collection in your shop Mark The Voting Booth 51 12-09-2012 11:07 PM
Air compressor water filter crquack Tools and Woodworking 33 05-29-2011 11:35 PM
3 pass mdf raised panel doors (bits?) cabinetal Router Bits - Types and Usage 7 06-28-2010 10:50 AM
Vacuum Filter Bags Mike The Bargain Bin 9 03-20-2009 12:03 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome