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Combining two amplified antennas

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Old 08-19-2018, 01:34 PM   #1  
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Default Combining two amplified antennas

Just installed an omnidirectional outdoor antenna with integrated amplifier and power injector at the TV end. Got every channel I want save one. Thinking about adding directional for one channel, want integrated amplifier for that one too since my downlead is quite long at 100 feet. I can use a separate cable for second antenna, but will I have trouble with two different DC voltages from power injectors present at the inputs of a combiner? Thanks!
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Old 08-19-2018, 04:19 PM   #2  
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Hello, Skipferry; welcome to the forum.

For an accurate answer we would need more details about the antennas and the channels, but the general answer is combine after the two power inserters; there is no DC voltage there, just signals.

Combining two antennas with a splitter in reverse doesn't always work, you just have to try it.

Combining a UHF antenna with a VHF antenna with a UVSJ usually works.

Last edited by rabbit73; 08-19-2018 at 04:25 PM..
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Old 08-19-2018, 08:56 PM   #3  
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You need two separate coaxes and power supplies setup setup as two separate systems, after the DC power injectors you can use an A/B switch to select any antenna you need to use, trying to combine two amplified systems with two different amps and power injectors will cause serious problems unless isolated by a switch.

You would need the exact same amps and power supply's to do it any other way.
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Old 09-19-2018, 01:18 AM   #4  
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Possibly you could use a ChannelMaster JoinTenna To connect the 2 systems. Don't know if they are still available. I use 6 to tie my 4 antennas together.

Get 36 channels from 12 stations in central Illinois. Eight duplicate networks, so 28 different channels. Tho some get independant at times.

Best part is nobody has to switch antennas.
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Old 09-19-2018, 04:45 AM   #5  
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If the preamp is built into the antenna, Jointenna may not be a solution:

https://support.channelmaster.com/hc...ntenna-CM0500-
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Old 09-19-2018, 05:45 AM   #6  
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Sam was referring to the original Jointennas which were discontinued a good number of years ago, perhaps as many as 8-10 years. You're confusing his suggestion with the "new" Jointenna that CM isnow selling which is nothing more than a fancy two-port splitter with a LTE filter built in.

Cue rabbit73's rant....

In any vent, the OP never returned after his initial post a month ago. Leave the thread to die....
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Old 09-19-2018, 09:07 AM   #7  
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Quote:
Originally Posted by projectsho89 View Post
Sam was referring to the original Jointennas which were discontinued a good number of years ago, perhaps as many as 8-10 years. You're confusing his suggestion with the "new" Jointenna that CM isnow selling which is nothing more than a fancy two-port splitter with a LTE filter built in.

Cue rabbit73's rant....

In any vent, the OP never returned after his initial post a month ago. Leave the thread to die....
Okay...
Would the "original" work with antennas with built-in preamps?
If so, what makes them different?
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Old 09-20-2018, 08:46 AM   #8  
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Combining OTA antennas that are not pointed in the same direction is only a good idea if your signal is very strong, since 50% of your signal will re-radiate out the other antenna.
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Old 09-20-2018, 01:10 PM   #9  
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A very simple solution is to use an antenna rotor..
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Old 09-20-2018, 04:30 PM   #10  
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Not so simple if you're trying to scan in stations from multiple directions and your tuner wipes the last scan data every time you scan, or you have multiple TV's and the little Mrs. wants to watch something in the other direction during football.
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