Combine 501 RF output with Cable Internet

[RandallA]

Alright, I got tired of searching and never got a straight answer.

I will be getting a 801 on Saturday and will need to move the 501 to the master bedroom. I want to still send the ouput of the 501 from the master bedroom to the living room.

This is what I got so far, for the 501 run I'm using diplexers to send the RF output to the living room and it works great. But I also want the Cable Modem in the living room and can't run another cable.

When I tried to combine the CATV (Cable Internet) and the RF output (501) on channel 3 using splitters, I was getting a scrambled signal on ch. 3. I only have HSI, no CATV but channels 2-5 are still coming in through the line. So both channels 3 are "fighting". The Internet works fine in this setup but I only see the scrambled signal on channel 3.

My question is what can I use to combine the HSI signal with the RF output of the 501. I've read that I should use an UHF modulator or signal combiner (ch. 3). I don't have an OTA channel 3 in the area, so I want to use that channel.

I was looking at this combiner but would like to know if anyone has tried what I'm trying to do or is it just impossible to do. I looked into wireless but most AV transmitters are in the 2.4 Ghz range and I don't want problems with my wireless router.

http://skydeals.us/signal.htm

Any help will be appreciated. We really like to complicate the hell out of things, don't we. The wife is looking at me like if I went bananas.

 

[ITK]

I dont think that will work as the output and the cable are on silmilar bands.

 

[Anole]

I bought one of those. Certainly a lot cheaper there, than my local electronics store.
For the very purpose of ... damn ... it's been a long time, and I wound up not using it.
I think I was planning on sending the outside antenna, combined with sat output, over to a bedroom TV.
Instead, I put another satellite receiver in the bedroom. Much cleaner solution.

You need to find out what part of the spectrum your cable company modems operate in.
What channel range. Maybe it's on the box/unit, or you can look up that model on the internet.

As to UHF modulators, Radio Shack -had- some all-frequency, digitally tuned, LED readout modulators for around $25.
I gave one to a buddy, who liked it so well, he bought two more.
He combined them (with some special filters) into his house wiring with his cable, so you could watch all sat receivers in any room.
He ran his modulators in the channel 80-90 range.



If you are diplexing your cable modem... wait, your cable has channel three ?
If so, forget trying to filter it out. It will be too strong for that filter above.
Are you actually trying to combine three things onto one coax?
1) incoming LNB signals ?
2) channel 3 from your bedroom ?
3) raw cable connection ?

.

 

[RandallA]

"If you are diplexing your cable modem... wait, your cable has channel three ?
If so, forget trying to filter it out. It will be too strong for that filter above.
Are you actually trying to combine three things onto one coax?
1) incoming LNB signals ?
2) channel 3 from your bedroom ?
3) raw cable connection ?"

No, I'm diplexing the satellite signal with the RF out of the 501 to the garage. From the garage I combined the Cable Internet from Comcast with the RF Out of the 501 using splitters. I searched Radio Shack and they don't have it. I found a UHF modulator on eBay for $19.99:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5782989728&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

As long as I can modulate the RF out (channel 3) to an UHF channel, I think I'll be OK.

 

[SimpleSimon]

Any time you try to combine cable and "local" RF, you're going to run into trouble - because you're backfeeding YOUR signal onto the cable system.

The cable company will frown upon this.

 

[RandallA]

I thought about that. I'm just going to find another way to run a cable. It's cheaper, I already have the cable and I won't get in anyones' way.

 

[Anole]

And it will work.
Good choice.
There - wasn't that easy?

 

[RandallA]

And it will work.
Good choice.
There - wasn't that easy?

Yes, it was. I was trying to avoid it though. I thought it could be done in some magical way.

 

[Anole]

Hard way this time.
Magic way next time.

 

[RandallA]

I got more answers in a cable forum about this issue. One guy recommended this site http://crossbarmedia.com/html/media_kit.html

http://crossbarmedia.com/html/mediacaster.html

That's exactly what I needed to distribute the signals around the house. The kit costs around $100 and I think is pretty neat. My solution was cheaper but this is very neat and it might help someone else distributing their video sources to another rooms.

Just wanted to pass along the info.

 

[kb7oeb]

From what I've read most cable modems download in the high UHF range but upload on low VHF below 50Mhz. Thats probably why they don't filter 2-5 since they are close to the upload frequency

 

[RandallA]

That's right. In my area, the upload is at 21.6 Mhz. Here are the frequencies for channels 2 - 5.

Video Audio
Ch. 2 55.25 59.75
Ch. 3 61.25 65.75
Ch. 4 67.25 71.75
Ch. 5 77.25 81.75