Can I combine two antennas from opposite directions

Discussion in 'TiVo Bolt DVR/Streamer' started by LilBear, Nov 1, 2019.

  1. Nov 1, 2019 #1 of 37
    LilBear

    LilBear New Member

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    I have two antennas (both amplified) facing basically North and South. I get 56 channels. I would like to set up a bolt system that would let me see stations and record on both antennas from each of two TVs, even at the same time. I have tried a splitter in reverse, and a ChannelMaster JoinTenna, with no useable results. I'm willing to try two Bolts, or a bolt and Mini. Any ideas?
     
  2. Nov 1, 2019 #2 of 37
    kpeters59

    kpeters59 Well-Known Member

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    Yes.

    I've had very good results doing that.

    -KP
     
  3. Nov 1, 2019 #3 of 37
    LilBear

    LilBear New Member

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    Which method?
     
  4. Nov 1, 2019 #4 of 37
    kpeters59

    kpeters59 Well-Known Member

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    Combining 2 antennas through a splitter 'backwards' in to one TiVo.

    -KP
     
  5. Nov 1, 2019 #5 of 37
    LilBear

    LilBear New Member

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    That did not work for me. That cancelled some channels from each antenna. Same for Jointenna. I was told it was because they were both amplified. Similar to Multipath Interference
     
    Last edited: Nov 1, 2019
  6. Nov 1, 2019 #6 of 37
    kpeters59

    kpeters59 Well-Known Member

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    Either remove the amps, or pad them down until it works as desired.

    -KP
     
  7. Nov 1, 2019 #7 of 37
    LilBear

    LilBear New Member

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    Can't remove amps. JUST getting enough signal with them. Thats why I'm asking for help. 43 miles South, 56 miles North
     
  8. Nov 1, 2019 #8 of 37
    pldoolittle

    pldoolittle Tivo'ing since 2001

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    Mix, then amplify.
     
  9. Nov 1, 2019 #9 of 37
    kpeters59

    kpeters59 Well-Known Member

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    There shouldn't be any frequency interference since they're in the same 'market', but are the physical frequencies of the 'dropped' channels close at all?

    It's possible the amps are causing it, so yeah, try mixing, then amplifying.

    There are band-pass antenna mixers that you could obtaine, as well.

    -KP
     
  10. series5orpremier

    series5orpremier Well-Known Member

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    There may be better antennas for the task than what you're using. Are any channels broadcast on VHF? (Combining works for me because all my VHF channels are in one direction and all my UHF channels in another direction and using VHF-only and UHF-only antennas makes sure I'm not combining signals from the same frequency).

    Do any two channels in opposite directions broadcast on the same frequency? You need highly directional antennas, but bad luck that your directions are 180 degrees from each other because some antennas pick up gain from frequencies approaching from directly behind them. If that's the case that both oppositely pointed antennas pick up some of the same channels, then combining their out of phase signals on the same frequency can cause that multi-path cancellation.

    I'm not informed on which antennas are good at blocking out gain from signals approaching from behind.
     
    Hotsauce1121 likes this.
  11. LilBear

    LilBear New Member

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    Nov 1, 2019
    I have tried several antennas, all with the same result. What I thought might work is to feed one Bolt with each antenna, then network them together. Has anybody tried that? Could I watch live broadcasts from one to the other Bolt? My purpose in asking you is to avoid buying a second Bolt, then find out that my theory does not work.
     
    Last edited: Nov 2, 2019
  12. LilBear

    LilBear New Member

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    Nov 1, 2019
    Good thinking - but I have VHF and UHF in Both directions.
     
  13. LilBear

    LilBear New Member

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    Nov 1, 2019
    That is a good theory, but the amps are preamps at the antennas, and have to be powered directly, before the mix.
     
    Last edited: Nov 2, 2019
  14. kpeters59

    kpeters59 Well-Known Member

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    Then get different amps?

    -KP
     
  15. kpeters59

    kpeters59 Well-Known Member

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    There isn't any reason you couldn't use 2 TiVo's, but Live TV doesn't work between them. A Mini would, but isn't zero effort to switch between Hosts.

    You could Multi-Room Stream a Recording, though.

    -KP
     
  16. LilBear

    LilBear New Member

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    Thanks for your help. Sorry to hear about not being able to share live between units. You can tell I've been working at this a while
     
  17. wmcbrine

    wmcbrine Well-Known Mumbler

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    This is more or less my system -- one antenna pointed at D.C. and one at Baltimore, not quite 180 degrees apart, but close. It was set up professionally, and admittedly, I never tested the antennas separately, so I don't know that I'm not losing any signal vs. what I could theoretically get that way; but it works pretty well. The signals are combined, no pre-amps, and the combined signal goes to a distribution amp/splitter.
     
    Mikeguy and kpeters59 like this.
  18. LilBear

    LilBear New Member

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    Nov 1, 2019
    Thanks to everyone for your help. Looks like the way I'm hooked up now is the way I have to stay. I have a Bolt on the South feeds, and the North feeds come in directly to TV. I can record South, but not North. South has many more channels, so I guess that's the best I can do. Was hoping to add recording to North, because that has the newscasts we Prefer. DTV commitment will soon be done, and I'm planning to send them packing
     
  19. series5orpremier

    series5orpremier Well-Known Member

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    TiVo usually has discounts Thanksgiving week so with a deal on an (refurbed Roamio?) OTA you could also record North.
     
  20. Narkul

    Narkul Active Member

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    Make sure the antennas are far enough apart from each other, at least 4 ft ideally. Make sure the cables running from each antenna to the combiner are exactly the same length to help reduce phasing. Phasing would have caused ghosting on old analog reception, but causes dropout on digital as the tuner has problems locking onto the signal. Phasing is likely the issue, and you may not be able to easily overcome it if both antennas are sending strong signals for same channels. You could also try adding an LTE filter to block the neighboring cell phone band.
     

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