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Two Antennas..One Pre-Amp..How to Connect?

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Old 10-22-2011, 12:05 PM   #1
How can anyone watch standard def?
 
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Default Two Antennas..One Pre-Amp..How to Connect?

Hi,

Decided to stop messing around with one antenna and now have two clearstream antennas each pointed about 100 degrees away from each other to the Hartford and then New Haven tv towers. I fed each lead from the antennas to a uhf/vhf signal combiner, from that one lead to the mast mounted pre-amp, then one lead down into the house to the pre amp power supply and then to the receiver. I had zero signal for all channels. What did I do wrong?

Before I tried the pre amp on the mast I simply combined the antenna leads to the uhf/vhf combiner and one lead down to an indoor amplifier and I got pretty good reception. Not sure why my mast mounted scenario didn't work when I expected it to work better.

I know there is a mast mounted pre amp by Channel Master that has separate inputs for vhf and uhf...is that what I need? I used the Antennas Direct CPA-19 Pre-Amp on the mast that only has one input, thus I combined the signals prior to connecting to this amp.

I don't want two downleads into the house....an a/b switch wouldn't work since I use a dtvpal dvr as my receiver and would not want to have to switch antenna signals to use before a particular recording.....same goes against a rotator.

Any advice would be greatly appreciated. I can certainly be reasonably happy with my indoor amplifier, but thought it would be even better with the mast mounted one....

Thanks in Advance
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Old 10-22-2011, 05:06 PM   #2
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Which two ClearStream antennas?
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Old 10-22-2011, 05:25 PM   #3
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I have a Clearstream 4 at the top of the mast that does well pulling in the Hartford and even Springfield Mass stations. It even pulls in a station far to the East in New London CT either from it's back or perhaps the signal bounced off some trees in my yard to the front of the C-4

The newer antenna lower on the mast is a Clearstream 2 (Half the size of the C-4) does pull in the stations to the South in New Haven. It's a high VHS (Digital Channel 10) that I was specifically trying to get and it worked.

Previously with only the Clearstream 4 on the mast and an indoor home depot type amplifier, I would only reliably get all the above tv markets mostly in the winter when the leaves would be off the trees. Even then, it had to be pointed very precisely, a few degrees off and I would miss some of the stations. I have been impressed with this antenna however, considering how many degrees the tv towers in this market are located from me. My main objective is to get the OTA working the best I can before winter since last winter I had about 4 feet of snow build up on the roof. No antenna adjustments would be possible!
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Old 10-22-2011, 05:34 PM   #4
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Excuse me....a high VHF station that is.
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Old 10-23-2011, 07:52 AM   #5
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Here's how Antennas Direct says to do it: http://www.antennasdirect.com/cmss_f...e_Antennas.pdf
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Old 10-24-2011, 10:00 AM   #6
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Connecting two dissimlar antennas pointing different directions usually gives you less signal from both since 1/2 of the signal from each will be radiated out the other antenna instead of to your TV.

This might work if signals are strong enough at the antenna.

You would be better served by two rg-6 lines to the inside then an RF switch to flip from one antenna to the other.
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Old 10-24-2011, 04:31 PM   #7
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If you're doing EITHER the C2 or the C4 PLUS the C5, then the diagram above is correct.

If you're trying to do all three antennas, then you're in a different ball game such as Jim described.
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Old 10-24-2011, 09:19 PM   #8
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Quote:
Originally Posted by projectsho89 View Post
If you're doing EITHER the C2 or the C4 PLUS the C5, then the diagram above is correct.

If you're trying to do all three antennas, then you're in a different ball game such as Jim described.
He is using a C-2 and a C-4. They're both UHF and they both have significant side lobes and back lobes in their polar patterns which will lead to all sorts of multipath problems. He shouldn't be combining them at all, and certainly not with a UHF/VHF combiner; separate drop cables and an a/b splitter are called for here. If pre-amps are called for, he needs separate pre-amps for each antenna.
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Old 10-26-2011, 04:11 PM   #9
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I too am in CT amd have the following which works great. I have a 4228 UHF stacked over a VHF on the mast. Each runs into my channel master 7777 pre amp and one line then runs into the house. I'm in the greater waterbury area and have the 4228 aimed NNE and the VHF aimed SE. With the 4228 aimed NNE, I still can get 59 through "the back" of the antenna - or maybe it's a side reflection but either way it works great.
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