how do i split a signal?

jonnyd97

DTVUSA Member
#1
I have a HD7698P on the roof with a RCA TVPRAMP1R preamplifier. Should I use one 6-way powered (or unpowered?) splitter or a series of 2-way splitters to get the signal from my roof to each viewing room? Some rooms are about 75-cable-feet away from the antenna.

Thank you men!
 

Fringe Reception

Super Moderator, Chief Content Editor
Staff member
#2
jonnyd,

Please fill us in with a little more information: I'm trying to get a better idea of the signal "strength level" you are currently working with. The RCA specifications say: Gain: VHF: 16 dB; UHF: 22 dB. This preamp may offer enough signal to be split without an additional amplifier (preferred).

Have you tried your antenna setup without the preamp and if so, can you receive the same number of channels without using it and if so, how many TV sets is your antenna currently feeding?

If the preamp is required for your existing setup, how many additional rooms are you adding for your total of six?

If two rooms are somewhat distant from the main preamplified downlead, but they are in the same direction (think east wing), a single coax split near two rooms will be less expensive than two coaxial cables and the combined losses from several 2-way splitters are similar to the losses in a multi-splitter.

75 feet isn't that long a run: I split signals 4-ways around my home using no pre-amplifiers or distribution amplifiers and my longest coax run is around 125 feet.

Jim
 
#3
It sounds like you're building some enormous Rube Goldberg contraption. If you needed a half dozen splitters, wouldn't someone have mentioned it by now? Why do you want multiple splitters when one will do? Why do you want power going to a simple splitter?

Splitting the signal six ways will bring one-sixth of the signal (give or take) to each receiver. The 16 dB boost on VHF increases the signal over 32 times. The 22 dB boost on UHF multiplies the signal over 128 times.

It doesn't improve signal to noise ratio at the point of amplification. It makes it worse. But it might improve the ratio by the time signals reach the receivers. It's nothing more than a mathematical trick. Power isn't the problem. The TV will add or subtract however much power is needed for the tuner.

Previous threads on this situation:
http://www.dtvusaforum.com/dtv-hdtv...wilton-ct-06897-tv-fool-report-available.html
http://www.dtvusaforum.com/dtv-hdtv...negard-hd7698p-funny-continuity-readings.html
http://www.dtvusaforum.com/dtv-hdtv...dings-continuity-rg-6-quad-shield-cables.html
http://www.dtvusaforum.com/dtv-hdtv...49842-rca-ant751-versus-winegard-hd7698p.html
http://www.dtvusaforum.com/dtv-hdtv-reception-antenna-discussion/49844-roof-versus-attic.html
http://www.dtvusaforum.com/dtv-hdtv-reception-antenna-discussion/49861-hd7697p-versus-hd7698p.html
http://www.dtvusaforum.com/dtv-hdtv...sion/49866-180-degrees-out-phase-antenna.html
http://www.dtvusaforum.com/dtv-hdtv-reception-antenna-discussion/51091-distribution-plan.html
http://www.dtvusaforum.com/dtv-hdtv...n/51371-preamp-versus-lightning-arrestor.html
http://www.dtvusaforum.com/dtv-hdtv-chat/51372-splitters-preamplifiers-distribution-amplifiers.html

The simpler you make it, the fewer things to break. The time for advice is over! The time for action is at hand. :director:

Rick
 

Fringe Reception

Super Moderator, Chief Content Editor
Staff member
#7
... It sounds like you're building some enormous Rube Goldberg contraption. If you needed a half dozen splitters, wouldn't someone have mentioned it by now?
Rick
Ricki,

Ummmm ... half a dozen splitters would be for 12 rooms. Jonny suggested 6 ways or rooms in his original post.

My response was to try to get an idea of his signal level and to make single coaxial runs to different areas of his home and not to make a Rube Goldburg mess. To me, two unnecessary parallel coaxial cables running 75 feet rather than a single one split at its' end makes no sense.

Jim
 
#8
Ummmm ... half a dozen splitters would be for 12 rooms. Jonny suggested 6 ways or rooms in his original post.
Ummm.. the man said "a series of 2-way splitters". You can't possibly get signal to 12 rooms with six 2-way splitters. You can get to 7 rooms max.

Admit it. If you'd read all 10 threads dealing specifically with this issue, thoroughly and carefully like I did, your reaction to this question would have been juuuuuuust slightly different.

Rick
 
#9
Is he pointed at 239 degrees magnetic?
I remember the importance of aiming was specifically pointed out. I also remember that he's already getting a good signal -- to one receiver from one antenna. So I guess this thread is all about splitting.

I'll stick my nose back into my own business. Jonny can speak for himself. I just thought he needed a kick in the backside to get moving.

R.
 
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