TiVo Community
TiVo Community
TiVo Community
Go Back   TiVo Community > Main TiVo Forums > TiVo Help Center
TiVo Community
Reply
Forum Jump
 
Thread Tools
Old 03-05-2013, 09:51 AM   #1
dlfl
Cranky old novice
 
dlfl's Avatar
 
Join Date: Jul 2006
Location: Near Dayton, Ohio
Posts: 5,859
Bad cable connection affects only one QAM frequency?

TiVo HD with TA on TWC, Southwest Ohio. For several months now I've noticed that anytime an SDV channel gets assigned QAM modulator frequency 543 MHz, there will be severe video pixelation and audio distortion. The signal level is 40 to 45, occasionally going down to 0 and occasionally losing tune on the channel altogether. SNR is 28 dB and RS error counts climbing rapidly. This is the ONLY QAM frequency that has these deficiencies. All other frequencies have signal strengths of 80 to 100, SNR of 34+ dB, and no RS error counts. Even adjacent QAM channels such as 549 MHz.

Today I had my second service call for this problem. The tech was the same one who came for the first call and this time I was able to show him the numbers for 543 MHz in DVR diagnostics. He immediately concluded the problem was upstream from my equipment and went outside to do something.

Turns out the first thing he did was get into the tap box at the corner of our yard and tighten the connectors. And that immediately fixed the problem! (Although it may have introduced problems on other QAM channels -- only time will tell if the fix is complete.)

My question for those who may know is:
Can a poor cable connection cause severe attenuation just on ONE 6 MHz frequency band? It seems counter-intuitive to me but .... ???
__________________

"It must be swell to be so perfect and odor-free" -- Del Griffith


VideoReDo users: Try
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

pyTivo users: Try
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
and
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dlfl is offline   Reply With Quote
Old 03-06-2013, 06:25 PM   #2
shamilian
Registered User
 
Join Date: Mar 2003
Location: NJ
Posts: 372
poor connectors as well as kinks in the wire can cause problems in a single or multiple narrow frequency ranges.
shamilian is offline   Reply With Quote
Old 03-06-2013, 06:33 PM   #3
dlfl
Cranky old novice
 
dlfl's Avatar
 
Join Date: Jul 2006
Location: Near Dayton, Ohio
Posts: 5,859
Quote:
Originally Posted by shamilian View Post
poor connectors as well as kinks in the wire can cause problems in a single or multiple narrow frequency ranges.
Can you expand on how this works or how you know this, or reference a document that discusses it?
__________________

"It must be swell to be so perfect and odor-free" -- Del Griffith


VideoReDo users: Try
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

pyTivo users: Try
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
and
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dlfl is offline   Reply With Quote
Reply
Forum Jump




Thread Tools


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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Advertisements

TiVo Community
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
vBulletin Skins by: Relivo Media

(C) 2013 Magenium Solutions - All Rights Reserved. No information may be posted elsewhere without written permission.
TiVoŽ is a registered trademark of TiVo Inc. This site is not owned or operated by TiVo Inc.
All times are GMT -5. The time now is 04:25 AM.
OUR NETWORK: MyOpenRouter | TechLore | SansaCommunity | RoboCommunity | MediaSmart Home | Explore3DTV | Dijit Community | DVR Playground |