2-HD7000R stacked in different directions question
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2-HD7000R stacked in different directions question


This is a discussion on 2-HD7000R stacked in different directions question within the DTV | HDTV Reception and Antenna Discussion forums, part of the Over-the-Air (Antenna TV) category.

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  1. #1
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    2-HD7000R stacked in different directions question

    Is it possible to stack 2 of the HD7000R? 1 pointed @ 30* and the other @ 245* with a combiner?
    I was considering mounting a UHF @ 245* with a combiner but the shipper goofed and sent me 2 antennas on 1 order.

    I understand I can stack them, combine in same direction but was wondering if doing this @30* & 245* if they would be lossy & null each other out. Thanks!

  2. #2
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    Quote Originally Posted by Unregistered View Post
    I understand I can stack them, combine in same direction but was wondering if doing this @30* & 245* if they would be lossy & null each other out. Thanks!
    They for sure would be lossy, and may result in severe multi-path interference. Do you have VHF stations from one direction and UHF stations from the other? If so, you could use a UVSJ to combine the two antennas (each receiving a different band) without loss.
    Snappy Dan Reminds You:

    DO NOT install antennas anywhere where they could fall into overhead power lines!!! An antenna falling into power lines may result in electrical shock or death. All outdoor antennas must be grounded in accordance with the National Electrical Code (NEC). Be careful while working on roofs or towers. Always use appropriate safety precautions!!!

  3. #3
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    UHF channel with one VHF channel from the direction @ 245* & the VHF is so strong I receive it from the back side @ 80% signal from the antenna pointing at 30*.

  4. #4
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    Winegard CC-7870 2 way TV Antenna Joiner Coupler (CC7870) $13.99 in stock @ address below.

    Winegard CC-7870 2-Way TV Antenna Joiner Coupler (CC7870) from Solid Signal

    Join two antennas to eliminate the need of a rotator. ****Takes 75 Ohm downleads from two different antennas and combines the signals. ****This unit is power passive on side.****

    With proper spacing, joining two antennas can be a great alternative to a rotator.**** It is recommended that you run equal lengths of coax cable from each antenna to the CC-7870 to eliminate multipath and out of phase signals.********Always join identical antennas for the best results.****

    Using a transformer-type antenna coupler as the CC-7870 provides isolation between antennas limiting the combining loss and possible antenna loading to no greater than -3.5 dB to the output signal level.************

    The reviews look good. You can read them @ the address above click reviews.
    It is important that both lines from the antenna be the same Length to the inputs of the Coupler like it says. If your RG6 is long 75 foot or more you can add an amp. I would also seperate the two antennas by 5 feet (don't stack them right on top of each other). Just my 2 cents.

    This was what I was going to use for my brother, but his Antenna is on hold.

    Regards,
    Charlie

    OTA - Fracarro LP345F Log Periodic antenna
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    Television Make/Model – VIZIO VO42L FHDTV10A
    Location – Texas by the grace of God

  5. #5
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    Its just a 2way splitter in reverse in a special box.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


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    Guest,

    I highly doubt combining the two antennas will be sucessful. I would run two coaxial cables to either a manual or remote-controlled A-B switch and establish two independent (seperate) antenna systems. Please keep us posted on your results.

    Jim

  7. #7
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    The 3.5dB loss is the same as a common splitter, makes me suspicious.

    That -3.5dB says the signal is both going down the line to the TV and also being re-radiated out the other antenna, just like a common splitter.

    Of course if your signals are strong enough to be cut in half and still work, I would not buy a $14 splitter when a $3 one will do the same job.
    Last edited by Jim5506; 02-07-2013 at 08:42 PM.

  8. #8
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    OP, whats your TVFool look like?

    That way we can see what your trying to acheive and any tricks that may be possible to get you up and running without attempting combining and risking multipathing issues.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


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    I agree, without seeing the TVFool report, anything suggested is a shot in the dark. Using a standard Splitter in reverse, is always a losing situation. They make combiners specially for that ! But given that the HD7000 is full range antenna, I can certainly agree that if there's any co-channel issues, that WILL be a problem.

  10. #10
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    TVFool report

    Quote Originally Posted by SWHouston View Post
    I agree, without seeing the TVFool report, anything suggested is a shot in the dark. Using a standard Splitter in reverse, is always a losing situation. They make combiners specially for that ! But given that the HD7000 is full range antenna, I can certainly agree that if there's any co-channel issues, that WILL be a problem.
    Here you go
    TV Fool

  11. #11
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    As you can see, you have channels in 4 directions. The HD7000's reception range should work for any of those. Also, it has a rather wide beamwidth. You could probably pick up both your 235 and the 250 with one Antenna (a), and the 20 with the other (b). Or you could point it (b) toward your 170 channel, and give up CBS for a CW. You could use a Winegard CC-7870 2-Way TV Antenna Joiner Coupler (CC7870) from Solid Signal to join your two Antennas together on to one Coax. Now, there is a CBS at your 20 location, but, it's rather weak, so try the 170 with your (b) antenna first, and hope for the best. Also, I don't see any co-channel problems, so it should be ok to use those two "back to back".
    Last edited by SWHouston; 02-08-2013 at 09:55 AM.

  12. #12
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    image.jpgI am receiving CBS pointed @ 30* +80%
    A friend has a combiner so this weekend I will try pointing the 2nd antenna @ 245* add the combiner and see what happens. I will keep you posted on the results.
    Thank you,

  13. #13
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    AZ-Toolman, I presume you're the Guest we've been talking to . That 245* sounds pretty close and I get the 30*, but, I'm not sure what you mean by "+80%"

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    Quote Originally Posted by SWHouston View Post
    Also, I don't see any co-channel problems, so it should be ok to use those two "back to back".
    There is still the issue of multipath especially due to the spacing apart of the antennas, even off the back you are stll going to pick up a reasonable signal on the other antenna. He wont know till he tries it, but theres the possibility of issues.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


  15. #15
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    Personally, I think it would be better (unless you want Telemundo or Daystar) to just point for 20degrees magnetic.

    A large combination antenna on that heading should pickup:
    (A large UHF antenna with a smallish-medium VHF diplexed together would also acheive a similar result, as Fox is the only VHF station and is quite strong.)

    MyNetwork
    ABC
    [VHF-High]
    Fox
    NBC
    CBS
    PBS
    Univision
    Home Shopping Network
    UniMas
    Azteca America

    and any associated subchannels.


    The CW will likely be strong enough to come in off the back of the antenna [especially if you are already receiving it] . Pre-amp may also help, especially if feeding multiple outlets.




    If you aim at 240degs you are just, for the most part, receiving the exact same content:

    NBC is just a retransmitter of same at 20degs
    CBS is same station
    UniMas is only an analog broadcast of same at 20degs
    PBS only differs in subchannels, primary channel is same as 20degs
    ABC is just a retransmitter of same at 20degs



    If you are already receiving the CW, it would likely be the first to go if you did combine the antennas because both signals arriving at each antenna are going to receive a more similar signal strength wise, and the tuner may not be able to discern one from the other.
    Last edited by nbound-au; 02-08-2013 at 05:35 PM.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


  16. #16
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    Alternatively you could swing your current antenna around to 240degs and receive most/all services from that site with your current antenna. You will end up with less services though.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


  17. #17
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    Quote Originally Posted by SWHouston View Post
    AZ-Toolman, I presume you're the Guest we've been talking to . That 245* sounds pretty close and I get the 30*, but, I'm not sure what you mean by "+80%"
    Yes, sorry for the confusion unregistered to AZ-Toolman. I was getting errors trying to register on iPhone.
    80% signal on tv with cbs sorry for typo. I get delays while typing with iPhone

  18. #18
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    Not into the Spanish stations. I tried aiming 245* but one of the stations from 30* was down to 44% signal and pixiling.
    PBS @ 245* has PBS kids and world which aren't available from the 30*.

  19. #19
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    Alternatively, you could aim for 240degs, which should give you the English majors except Fox, and use a Ch25 Jointenna and a UHF antenna (or your other HD7000R) to mix it in. You would likely lose the other PBS that way, and MyNetwork. Im assuming Fox was the station at 20degs that was having issues though.


    The other option is to go for a omni or bi directional antenna, which should give you most stations there. Likely to need a pre-amp though, especially if split and/or long run(s)
    Last edited by nbound-au; 02-08-2013 at 05:45 PM.
    nbound-au is a qualified Antenna, Satellite, and MATV installer.

    I live in DVB-T land.


  20. #20
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    UPDATE
    I installed the 2nd HD700R and found out several things. I had to space the vertical stacking about 30" apart.
    I tried several splitters and the only one I could get to work was one for an antenna and satellite. If I reversed the coax I would loose the signal on the top antenna pointed @ 245* 27.1 uhf and the antenna pointed @ 30* vhf would be 80-100% signal. Reverse the coax again and both directions the signals 50-60% except for channel 11.1 38-40% signal.
    I need recommendations for a real combiner.
    MOST are splitters. Ideas?
    Thanks
    Last edited by AZ-Toolman; 02-09-2013 at 07:14 PM.

 
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