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Topic:
Missing CBC on 1 Cable Outlet
This thread has 8 replies. Displaying all posts.
Post 1 made on Tuesday June 15, 2010 at 16:07
PitCritter
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This is a little off-topic, but maybe someone here can help. I have three cable outlets in my home (Cogeco Niagara Falls). Two of them get all appropriate channels, but my living room outlet refuses to give me CBC (Channel 5, cable 6). All other channels come in with good signal. I've tried two TVs (one good quality Samsung,and one Dynex). Neither one gets a hint of a signal on cable 6. The Dynex, when connected in the bedroom, gets it perfectly. I'm currently watching the World Cup in the living room on Telelatino...my Spanish isn't that good. Please help.
Post 2 made on Tuesday June 15, 2010 at 18:28
Daniel Tonks
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I think some detective work is necessary. First - I'm assuming you're talking about analog cable reception? Second - where are these lines fed from? Try to find the splitter or amp, and see if the problem is at both ends of the line. I would guess either a bad cable, a bad splitter or someone has some sort of filter on the line.
OP | Post 3 made on Tuesday June 15, 2010 at 20:48
PitCritter
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Thanks Daniel. You're right some detective work seems in order. I already have done some. First, yes, we're talking about analog cable. Second, these lines run into my condo unit from the distribution rack 10' below my ground floor unit. The outlet I'm having trouble with is the first one in line. It splits from there to the rest of the condo. I guess that the next step is to disconnect the rest of the unit and try the line coming directly from the basement. There are no splitters on the line between the wall outlet and the tv, so the in-wall splitter seems to be the only likely culprit. It seems strange to me though, that the splitter would pass full signal on one leg and filter a single channel on another.

I'll try this tomorrow (I'm at work right now) and post back. I really hope that it's something as simple as a defective splitter.
Post 4 made on Tuesday June 15, 2010 at 23:12
hd fan
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I think the culprit is the in-wall splitter but rather than filtering out analog cable ch 6 I am inclined to think that it gets cancelled out as a result of intermodulation between carriers. Do not ask me which ones because I do not know. But if indeed the splitter is filtering out ch 6 on 1 leg then that most be the perfect filter ever since you say that quality on adjacent channels (and also any other) is perfect. A real filter of any kind or technology will always degrade signals of adjacent channels to some degree, only an "ideal" filter in theory does not alter adjacent channels (although there are very good filters out there that do an almost perfect job).

I have a similar problem in my home, for some reason (I beleive it started after the last firmware) my 9242 PVR from Bell TV only outputs TV2 tuner on ch 85 no matter which ch I select on the modulator menu. Guess what?, if connected straight to the TV I get perfect picture on ch 85 but throughout the in-home cabling nothing , only snow , not even an out of sync weak signal (kind of horizontal lines) and the funny thing is that ch 85 on Rogers has nothing there , not even digital carriers (unless the internet service is there) because my QAM tuner does not pick up anything not even a scrambled QAM channel on 85. It has to be some sort of cancellation due to intermodulation since even CH 33 UHF coming from Buffallo is too weak (or maybe CH 32 WNLO 10 Mhz below could be the culprit). Cable ch 85 has a similar frecuency as OTA UHF ch 33. I know there is a lot of ingress from the powerfull OTA signals on the in-home cabling since even cable ch 95,96,97 that use the FM band get a lot of interference and of course the typical Ch 5 and Ch 9 that you can even see CBC and CTV in the background caused more likely due to a poor ground. I can even get CBLFT ch 36 UHF with lots of snow on cable ch 76 (after I installed a ch 72-78 to create space for up to 3 new modulated tv channels from my satellite receivers to distribute them thoruout the house). I definetely have to properly ground the whole system (I think it is the 3x4 FTA satellite switch outside).

Funny how a particular signal or channel might affect others eh?.
Post 5 made on Monday June 28, 2010 at 08:58
OTAHD Addict
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(hmmm 2 weeks old, but i'll throw my $0.02 in anyway.)
The missing channel can be caused by a slightly shorted cable.

ie, A staple piercing but not completely shorting creating a
capacitive filter. Or a single strand from the shielding touching
or nearly touching the center conductor in one of the F connectors.
This is effectively creating a notch filter with a wide 'Q'
RF frequencies act different to shorts and near shorts.

Being ch 6 is on the top of vhf low @ 82-88 mhz, and ch 7 @ 174-180 mhz,
ie: you could have a short at 95mhz with a band width of 22 mhz which
would clobber ch 6, but not ch 5 or ch 7.

If Cogeco still broadcasts FM radio on analog cable, you could
hook up a tuner to the coax at the different points and see if the
lower radio stations are gone too.
Gimmy my HDTV and no one gets hurt!
Post 6 made on Monday June 28, 2010 at 10:51
SunnyJim
Long Time Member
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41
If you are living in "The Falls", why are you on cable?
You get the full load of Buffalo centred signals, and most of the Toronto centred signals.
Watch the World Cup off the air on CBC-TV; the signal quality shows why cable is the thing of the past.
_________________

Now if the broadcasting companies would start to use their sub-channels ...
Post 7 made on Monday June 28, 2010 at 18:13
hd fan
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good point OTAHD Addict. Rogers in my area got rid off the FM stations and now uses chls 95, 96 ,97 which are adjacent to ch 6 since they use the FM band spectrum therefore if that is the case also for Cogeco Niagar Falls the OP must also experience problems with adjacent ch 95 and ch 5 as well. Too bad the OP has not updated this thread BTW.
Post 8 made on Wednesday June 30, 2010 at 18:53
OTAHD Addict
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Yup, rogers did that without notice.
Peeved a lot of people that i know.
Will have to wait and see if the OP
comes back to post his/her resolution...
Gimmy my HDTV and no one gets hurt!
Post 9 made on Wednesday June 30, 2010 at 19:12
Daniel Tonks
Wrangler of Remotes
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Rogers dropped FM quite a while ago. A shame because I still had quite a few devices that were using that. Crummy little FM antennas just don't do the same job.


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