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  #21  
Old 03-07-2020, 06:40 PM
MED MED is offline
 
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Location: Aiken, SC
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I remember someone at Garmin told me the distance allowed for the adsb antenna changed from the hole in the tailcone to the position under the baggage compartment. I suggest speaking with someone from Garmin, perhaps the G3X guys can provide the best contact.
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  #22  
Old 03-07-2020, 07:30 PM
sjarrell sjarrell is offline
 
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Location: Hendersonville, NC
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Originally Posted by MED View Post
I remember someone at Garmin told me the distance allowed for the adsb antenna changed from the hole in the tailcone to the position under the baggage compartment. I suggest speaking with someone from Garmin, perhaps the G3X guys can provide the best contact.
I can't see why there would be a maximum distance requirement if you're using a cable of adequate size and you meet the requirements set forth in the installation document, but I'll certainly check with Stein and / or Garmin. Screenshot of the installation doc requirements is below.

https://www.dropbox.com/s/gnn4jmwt9e...ments.jpg?dl=0

Thanks!
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Last edited by sjarrell : 03-07-2020 at 07:44 PM.
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  #23  
Old 03-08-2020, 03:02 PM
BobTurner BobTurner is offline
 
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Originally Posted by sjarrell View Post
I can't see why there would be a maximum distance requirement if you're using a cable of adequate size ...

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I think you?re thinking of power cables at low frequencies or DC, and ohmic losses. At a GHz, it hardly matters how thick the wires are - nearly all the current is in a thin layer at the surface of the conductor. And all practical foam dielectrics absorb energy at these frequencies. If the cable is too long, the losses can be too high...
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  #24  
Old 03-08-2020, 03:57 PM
sjarrell sjarrell is offline
 
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Originally Posted by BobTurner View Post
I think you?re thinking of power cables at low frequencies or DC, and ohmic losses. At a GHz, it hardly matters how thick the wires are - nearly all the current is in a thin layer at the surface of the conductor. And all practical foam dielectrics absorb energy at these frequencies. If the cable is too long, the losses can be too high...
Thanks Bob. Are you aware of any cable length limitations for the ADSB antenna cable run? I can't seem to find any in Garmin's installation instructions.

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