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Guest Message by DevFuse

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Diplexer help

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5 replies to this topic

#1 OFFLINE   hahler2



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Posted 15 October 2010 - 07:01 PM

I currently have 2 coax cables going to my satellite receiver. One obviously carries the Sat signal and the other my OTA. I would like to free up one coax for using ethernet over coax. However, if I use a diplexer and combine the signals I lose some stations that I get running the ota on a separate coax. I am using an amplifier right before the ota signal runs into the diplexer.

My question is would I get better signal if I put a second amplifier after the diplexer at the receiver and/or put a pre amp at the antenna?

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#2 OFFLINE   RasputinAXP


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Posted 15 October 2010 - 07:32 PM

If I understand correctly, Ethernet over Coax can't coexist with OTA.

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#3 OFFLINE   scooper


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Posted 15 October 2010 - 07:47 PM

You would be better off with a preamp at the antenna before it goes into the combining diplexer. But the problem there is how do you power the pre-amp ?
I've seen diplexers at Ace Hardware that "output power" to both the satellite LNB and the OTA - I don't know if that feature actually works for powering a preamp. Most receiver LNB inputs put out too much voltage (18-20VDC) to power a preamp(5-9VDC).
You CAN put antennas on your owned and/or controlled property...


#4 OFFLINE   BattleZone


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Posted 15 October 2010 - 07:49 PM

I'm pretty sure hahler2 is trying to diplex the sat and OTA signals together, so he can use the other coax for Ethernet.

What kind of amp are you using? Model? How long is the cable run from the OTA antenna to the amp? What kind of signal strengths are you seeing?

RF is a strange beast, and what works in one location may not always work at another, so there's a bit of art to it.

#5 OFFLINE   oljim



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Posted 16 October 2010 - 05:34 AM

Save your self more problems, run new cable
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#6 OFFLINE   hahler2



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Posted 17 October 2010 - 10:10 AM

The amplifier that i currently am using is the wineguard amp that came with the antenna. All it says on it is that it outputs 18 v dc at 5.4 w. So I guess I'm not sure about it.

Running another cable is just really not an option. I would have to take out a lot of sheet rock in order to do it.

Cable run from the Antenna to the amp is about 50 feet. Than another 30 or so from diplexer to receiver. When i run the cable separately signal strength is very good. 70 or better.

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