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Two indoor antennas?

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Old 02-05-2007, 11:20 AM   #1
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Default Two indoor antennas?

Is it possible to connect two or more indoor antennas to the same input and use them simultaneously so that you don't have to adjust the direction as much?

I'm using a Radio Shack 15-1892 connected to a Sony KDF-60XS955. The 1892 is connected to the TV's antenna input. I know I could connect a second antenna to the TV's cable input, but I'd like to know if there's any way to connect a second 15-1892 to the same input. I'm guessing the answer is no, but I thought I'd ask.
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Television: Sony KDF-60XS955
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Subwoofer: Boston Acoustics PV500
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Antenna: Radio Shack 15-1892
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Old 02-05-2007, 11:51 AM   #2
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The problem involved with attaching two antennas to one antenna input is not a physical issue: a simple 2-way splitter would accomplish that, but rather the multipath interference that it has the potential to creat. I do remember one poster describing using two Silver Sensors in an array designed to minimize multipath interference, but I can't remember exactly where it was located.

Is an outdoor an absolute non-issue for you? I guarantee you'll be happier with your reception if you use one.
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Old 02-05-2007, 01:54 PM   #3
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Quote:
Originally Posted by tigerbangs
The problem involved with attaching two antennas to one antenna input is not a physical issue: a simple 2-way splitter would accomplish that, but rather the multipath interference that it has the potential to create.
I didn't imagine it would work (at least not easily), but I wanted to be sure so thanks much for confirming that.

Quote:
Originally Posted by tigerbangs
Is an outdoor an absolute non-issue for you?
It's not at all an impossibility for me and I may well go with an outdoor antenna in the long run, but for now I'm experimenting with indoor with pretty good success (See my earlier post below) to see how much I can get.

I recently decided to drop Comcast after my Motorola 6412 broke down for the third time and because I'm much more of a DVD / HD DVD watcher than a TV watcher... I had been planning on getting Verizon FIOS TV (although I know they use the same STB) when it becomes available in my area and picked up the RS 1892 as an interim measure and really more out of curiousity than anything else, but now, encouraged by the results, I am giving very serious thought to just sticking with the indoor antenna for now and eventually upgrading to an outdoor antenna. (Frankly, if I didn't have to adjust the direction of the indoor antenna, I probably would just stick with it.)

Thanks again for the info.



Quote:
Originally Posted by yangc
I recently picked up a Radio Shack 15-1892 (the second link in Rick0725's post below) and have had great success with it: My TV is on the first floor of a townhouse in the DC area and I reliably pick up the following stations. (I've included the Antenna web information for a reference -- The second to last number on the right is the miles from the station.)

* yellow - uhf WUSA-DT 9.1 CBS WASHINGTON DC 196° 15.1 34
* yellow - uhf WRC-DT 4.1 NBC WASHINGTON DC 196° 15.8 48
* yellow - uhf WJLA-DT 7.1 ABC WASHINGTON DC 196° 15.1 39
* yellow - uhf WMAR-DT 2.1 ABC BALTIMORE MD 72° 24.3 52
* yellow - uhf WJZ-DT 13.1 CBS BALTIMORE MD 72° 24.3 38
* yellow - uhf WNUV-DT 54.1 CW BALTIMORE MD 72° 24.4 40
* yellow - uhf WBFF-DT 45.1 FOX BALTIMORE MD 72° 24.4 46
* red - uhf WDCA-DT 20.1 MNT WASHINGTON DC 196° 15.1 35
* red - uhf WTTG-DT 5.1 FOX WASHINGTON DC 197° 14.7 36
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Television: Sony KDF-60XS955
Receiver: Yamaha RX-V750
Main Speakers: 2 x Boston Acoustics VR1
Center Channel: Boston Acoustics VRC
Surround Speakers: 2 x Boston Acoustics CR67
Subwoofer: Boston Acoustics PV500
DVD/CD/DVD-A/SACD Player: Pioneer Elite DV-45A
Game Console/Blu-ray Player: Sony Playstation 3
Game Console/HD DVD Player: Microsoft Xbox 360 + HD DVD Player
Universal Remote: Logitech Harmony 550
Antenna: Radio Shack 15-1892

Last edited by yangc; 02-05-2007 at 01:59 PM.
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Old 02-05-2007, 02:45 PM   #4
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This may be what tigerbangs was thinking of. The idea is that by carefully tuning the placement of the two antennas you can control the "null"s in the reception pattern.
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Old 02-05-2007, 02:57 PM   #5
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Quote:
Originally Posted by yangc
Is it possible to connect two or more indoor antennas to the same input and use them simultaneously so that you don't have to adjust the direction as much?

I'm using a Radio Shack 15-1892 connected to a Sony KDF-60XS955. The 1892 is connected to the TV's antenna input. I know I could connect a second antenna to the TV's cable input, but I'd like to know if there's any way to connect a second 15-1892 to the same input. I'm guessing the answer is no, but I thought I'd ask.
you might consider an A-B switch, If getting up to switch from A to B is a problem, RS sells an IR controlled A-B switch.
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Old 02-05-2007, 03:10 PM   #6
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Quote:
Originally Posted by JamieP
This may be what tigerbangs was thinking of. The idea is that by carefully tuning the placement of the two antennas you can control the "null"s in the reception pattern.

Yes, that's what I was thinking of. Obviously, it will only work when you are using a highly directional antenna with very small side lobes, but it WAS the link I was looking for: THANK YOU!
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Old 02-05-2007, 04:09 PM   #7
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I've read through that HDTV primer page, which explains how to aim two antennas in the same direction, but what I was actually interested in knowing is, can you connect two antennas aiming in different directions. In other words, could I aim one antenna at 196 degrees to get Washington, DC stations and another at 72 degrees to get Baltimore stations, and connect the two antennas with a splitter?

(I'm fairly certain the answer is No, but that's what I meant to ask.)

Quote:
Originally Posted by JamieP
This may be what tigerbangs was thinking of. The idea is that by carefully tuning the placement of the two antennas you can control the "null"s in the reception pattern.
__________________
Television: Sony KDF-60XS955
Receiver: Yamaha RX-V750
Main Speakers: 2 x Boston Acoustics VR1
Center Channel: Boston Acoustics VRC
Surround Speakers: 2 x Boston Acoustics CR67
Subwoofer: Boston Acoustics PV500
DVD/CD/DVD-A/SACD Player: Pioneer Elite DV-45A
Game Console/Blu-ray Player: Sony Playstation 3
Game Console/HD DVD Player: Microsoft Xbox 360 + HD DVD Player
Universal Remote: Logitech Harmony 550
Antenna: Radio Shack 15-1892
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Old 02-05-2007, 04:48 PM   #8
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Quote:
Originally Posted by yangc
I've read through that HDTV primer page, which explains how to aim two antennas in the same direction, but what I was actually interested in knowing is, can you connect two antennas aiming in different directions. In other words, could I aim one antenna at 196 degrees to get Washington, DC stations and another at 72 degrees to get Baltimore stations, and connect the two antennas with a splitter?

(I'm fairly certain the answer is No, but that's what I meant to ask.)
Well, you could point the antennas in the same direction, but design their spacing carefully to get two positive lobes 124 degrees apart. Probably non-trivial, but maybe theoretically possible.

From a practical viewpoint, and A/B switch might make more sense.
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Old 02-05-2007, 05:11 PM   #9
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You can program channel, direction, and gain with that antenna. study the instructions, be patient, and attempt to program. hate to see you spend more money if you do not have to.

There are 12 antenna directions available to program.

The antenna will electronically rotate 330 degrees

I would try to electronically rotate that antenna. trying to aim 2 antennas combined may even be more challenging.

Last edited by Rick0725; 02-05-2007 at 05:16 PM.
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Old 02-05-2007, 05:15 PM   #10
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Quote:
Originally Posted by yangc
I've read through that HDTV primer page, which explains how to aim two antennas in the same direction, but what I was actually interested in knowing is, can you connect two antennas aiming in different directions. In other words, could I aim one antenna at 196 degrees to get Washington, DC stations and another at 72 degrees to get Baltimore stations, and connect the two antennas with a splitter?

(I'm fairly certain the answer is No, but that's what I meant to ask.)
It is possible using a specialized combiner called a Jointenna made by Channel Master. There are several posts on this so a search of this forum using "jointenna" will result in a full night's reading. Basically each jointenna will couple a single channel from one antenna (secondary antenna) to a range of channels from the other primary antenna. If you have more than one station in any given direction of the secondary antenna, you will need another jointenna for each channel. Then they are cascaded and due to the losses involved a high gain low noise preamp is generally required for each antenna as well as a lot of splitters.

If that sounds like a lot of iffy stuff, it is and should only be attempted if you want another hobby because although it is possible to do what you want to do, a lot of technical knowledge, or a lot of trial and error, is required.

There are indoor antennas that have rotors built into them with remote controls even. I'd go searching for one of those.
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Old 02-05-2007, 05:20 PM   #11
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Quote:
There are indoor antennas that have rotors built into them with remote controls even. I'd go searching for one of those.
the 15-1892 will already do that. need to read the instructions and stumble thru the set up.

that antenna can store up to 100 channels with up to 12 directions and 3 different gain settings. pretty cool actually.

Last edited by Rick0725; 02-05-2007 at 05:22 PM.
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Old 02-05-2007, 06:24 PM   #12
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I didn't see your earlier post. He's all set, really.
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Old 02-06-2007, 12:17 PM   #13
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Quote:
Originally Posted by Rick0725
the 15-1892 will already do that. need to read the instructions and stumble thru the set up.

that antenna can store up to 100 channels with up to 12 directions and 3 different gain settings. pretty cool actually.
The 1892 does do all of that quite well and I have it all set-up making good use of the presets. Not to beat a dead horse, but just to be clear, I asked the question because I was just curious as to whether or not multiple indoor antennas could be connected simultaneously to the same input so as to avoid the necessity of adjusting the direction of the antenna. It's not that adjusting the direction is such a chore, particularly when you have an antenna with a rotor and a remote -- But if it were a simple matter, I would gladly pay for a second 1892 to avoid having to do it.

At any rate, thanks for all the info!
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Television: Sony KDF-60XS955
Receiver: Yamaha RX-V750
Main Speakers: 2 x Boston Acoustics VR1
Center Channel: Boston Acoustics VRC
Surround Speakers: 2 x Boston Acoustics CR67
Subwoofer: Boston Acoustics PV500
DVD/CD/DVD-A/SACD Player: Pioneer Elite DV-45A
Game Console/Blu-ray Player: Sony Playstation 3
Game Console/HD DVD Player: Microsoft Xbox 360 + HD DVD Player
Universal Remote: Logitech Harmony 550
Antenna: Radio Shack 15-1892
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