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Thread: ADS-B cable length

  1. #1
    Passenger
    Join Date
    Nov 2018
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    8

    ADS-B cable length

    Hi,

    I want to be a volunteer for ADS-B receiver. My apartment is on the second floor and the roof is 25 meters away from me. So I need longer H155 Coax cable. First, I read the equipment instruction and it is written that cable length have to be max. 10 meters. Do you think is that a problem? Second, If it is not a problem, how can I provide the longer cable? I searched on the net but this cable is really hard to find.

    Thank you!

  2. #2
    Super Moderator
    Join Date
    May 2011
    Location
    T-NZCH1, PP:PH New Zealand
    Posts
    4,297
    For every m of length. You lose more signal. Go over 10 and you run risk of losing more the contacts/distance
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

  3. #3
    Passenger
    Join Date
    Nov 2018
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    8
    But otherwise I have to replace it on the balcony which is surrounded by walls. Isn't that much worse?

  4. #4
    Purser
    Join Date
    Dec 2014
    Posts
    114
    Belden H155 cable loss figure at 1000Mhz (1 GHz) is stated to be 29.6 db per 100 metres. So loss for a 10 metre cable is 2.96db and for a 25 metre cable it increases to 7.4db.

    Although any loss has an effect, 7.4db is not disastrous. Putting the antenna on the roof may give you additional signal strength that may offset cable loss.

  5. #5
    Passenger
    Join Date
    Nov 2018
    Posts
    8
    Thank you!

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