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Interesting, i heard this from a cable tech that came to my house today....

aphex

aphex

Moderator<br>All Things Apple
Moderator
As im sure many of you know, i've been having issues with my cable/cable modem the past few days... Finally got a stable signal after i replaced the modem, only to have it die again last night.

Cable tech came to the house today, very nice guy who just got out of the marines not too long ago. Nevertheless, after checking my signals, he mentioned that he has seen alot of tv tuner cards backfeed into the system, causing the modem to lose signal.

The way i currently have my cable modem setup in the room is:

Wall -----> 1000mhz (-3.5db) dual splitter
(1)------> Cable Modem
(2)------> TV Tuner Card

Sure enough, unplugging the cable to the tv tuner fixed the problem. Didn't disconnect the splitter, didnt touch any other cables, just the one from the splitter to the tv tuner.

Anyone heard of this before?

He even said that occationally, he's seen tv tuner cards backfeed bad enough to cause modems on the other side of the house to lose signal (or at least harm it)...
 
when i first had cable at my place i lost connections to games every few minutes, he installed i think a splitter or something. ever since its been perfect *crosses fingers*
 
I had our cable tech put special filters on the splitter that feeds the TV signals so that the cable modem signal was as isolated as possible. No problems now for over 4 years.
 
Weird.

Is it only certain TV tuners or what? I haven't had that problem with my Radeon AIW....
 
I have a super cheap tuner thats so bad I use a VCR to tune to RCA because plugging the cable into the card killed the signal everywhere.
 
Well my signal is fairly weak as it is, i think this just exacerbated the condition....
 
Originally posted by: Eli
Weird.

Is it only certain TV tuners or what? I haven't had that problem with my Radeon AIW....
Click to expand...

When I installed a Radeon 7500 AIW, I could never get anything above 130KB/s. With out the cable connected, I got 200+ (from the same source).
 
Originally posted by: SSP
Originally posted by: Eli
Weird.

Is it only certain TV tuners or what? I haven't had that problem with my Radeon AIW....
Click to expand...

When I installed a Radeon 7500 AIW, I could never get anything above 130KB/s. With out the cable connected, I got 200+ (from the same source).
Click to expand...
Weird?! I have the same card, and my cable setup could hardly be considered optimal...


Line In > 2 way splitter (1) Living Room TV
.........................................(2) Cable Line to Bedroom > 3 way splitter (1) Cable Modem
.......................................................................................................................(2) Cable TV
.......................................................................................................................(3) Radeon AIW

The first splitter is outside. It is high quality and grounded. The second is just a cheap Radio Shack splitter and isn't grounded. I have no hard numbers on signal strength, but it doesen't effect my bandwidth.... I get the full rated 3.0/256k, and don't have any abnormal ping spikes or anything...
 
I get the full rated 3.0/256k, and don't have any abnormal ping spikes or anything
Click to expand...

Well. mine never really effected my speed... Just the stability of my connection and my power levels (uplink specifically)
 
Originally posted by: aphex
I get the full rated 3.0/256k, and don't have any abnormal ping spikes or anything
Click to expand...

Well. mine never really effected my speed... Just the stability of my connection and my power levels (uplink specifically)
Click to expand...
Yeah..

I know all about low signal strength. When I first got cable a few years ago, my wall jack was horribly green and corroded. I suffered through horrible ping spikes/packet loss and connection problems.. I never noticed how nasty the jack was since it was back in the corner.

One day I took a flash light over there and noticed how bad it was. Took a wire brush to it, and bam.. everything was perfect. After having 2 techs out, etc etc... Grumble.

Anyway, yeah.. my cable connection hasn't been down in a good 6-8 months....

I suppose it's possible that the Radeon is lowering the signal strength, but not enough to affect connectability..... isn't there any way to tell your signal strength without hooking their little meter dealie up to the line?
 
You know, it'd be nice if they passed the signal through to the TV Tuner card... via an 'out' port. Then the cable modem would get all it's power it needed and you wouldn't need a fancy splitter and it could block out whatever signals it didn't want back from that port.





 
so does just having the TV tuner plugged in ruin your cable, or did you actually have to be using it?
 
Originally posted by: PoPPeR
so does just having the TV tuner plugged in ruin your cable, or did you actually have to be using it?
Click to expand...

For me, it was just being plugged in that affected it. I guess since your computer is powered up, its always pushing something.
 
Originally posted by: Eli
Originally posted by: aphex
Eli: Do you happen to have a motorola cable modem?
Click to expand...
No, I have the older POS RCA modem.
Click to expand...

Damn, if you have a Motorola, you can dial in the IP of the modem and check your signals yourself...
 
Originally posted by: Megatomic
I had our cable tech put special filters on the splitter that feeds the TV signals so that the cable modem signal was as isolated as possible. No problems now for over 4 years.
Click to expand...

Do you know anything about these filters?

My cable modem dies periodically, and I'm not sure why. All the lights stay lit, and unplugging it and plugging it back in again always fixes the problem....but it IS irritating.
 
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