I did an install where I used the squarish shaped terk antenna and a 25db amplifier. The setup originally did not work and I installed the the Terk diplexer w the Directv satellite box on the ANT feed coming from the diplexer and a 5 in 8 out multiswitch (no D/C block on that side) where the sat and ant comes into the house. I am having reception issues and to top it all off I read the fine print on the Terk diplexer and it said do not use a D/C block w an amplified antenna. Theoretically I have an amplifier on the system and I do get some channels vs none without the D/C block so does anyone have any ideas on if I did a big no-no with the D/C block and how to fix the issue correctly?
Any help would be great.

[Link: remotecentral.com]

Yeah. That's the ticket. I'll even shout again.

Thanks for the info. One clarification to the scenario: The amplifier is an RCA (sic) and it is powered from a 120 volt outlet in attic. Does that mean I am not sending voltage through the ant side of the diplexers by keeping the D/C block in line? And, do I add another D/C block on the 5in 8out multiswitch to stop any voltage from backfeeding to the antenna to prevent loss of reception???

The thread referred to has the whole answer. I don't understand why you have anything else to ask if you read it carefully. Basically, if an amp is located at the antenna and has a power supply located someplace else, then DC is sent from someplace else up to the antenna. If you diplex that signal, the DC will be blocked and your amplifier will not get any power. It will then give you much less signal than you would get with the same antenna and NO amplifier. But let's carry on with the quesion:


Why the (sic)? I am used to seeing this where someone says something not quite rite (sic) to indicate that you are quoting a misstep, as in this sentence.

More important than where the power comes from, where is the power injected into the cable? If it is injected downstream from the multiswitch, the multiswitch will block it so it can't go up to the antenna. If you are injecting it between the multiswitch and the antenna on a line that also has a satellite signal on it, you are screwing up the satellite signal because a DC voltage that is set to 13 or 17 volts, depending on the station, is part of the receiver's method of getting stations. You can't mix antenna power with satellite signal. No way, nohow.


Diplexers mix a satellite signal, which has DC voltage and perhaps tone, with antenna or cable signals. Any DC voltage on the cable or antenna wires do not pass through any diplexers.


You don't need to add a DC block on the multiswitch, because things already won't work because the multiswitch's UHF/VF input blocks DC automatically.