FlightAware Discussions

Loss of Signal

Hello, I have recently increased my height of the antenna from 50 ft to 150ft.
As for this I did not have enough cable, so I interconnected two cables, will this interconnection lead to signal loss at my feeder ?

Each interconnection and each connection necessarily creates a loss of signal, after this loss is certainly negligible with 1 or 2 connections.

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The longer cable will lead to signal loss.

A run of 150ft cable normally warrants a filtered amplifier, but that’s complicated with the FA provided FlightFeeder as the GPS signal is transferred via the coax as well at least on most models.

Assuming you would use quality LMR400 coax, 150 ft will still result in a loss of around 7 dB.
Which might be acceptable.
With lesser coax you’ll lose more signal.

@obj do you have a recommendation for this installation?
Would a wideband LNA work with a Flightfeeder?

This would be complicated to get right since the G10 antenna is an active (powered) antenna. There’s a reason we don’t offer long cables for G10 installs…

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I guess the powered portion is just amplifying the GPS signal?

@Carveraviation
The easiest but also somewhat expensive option would be to get an LMR400 cable for the complete length of the run.
It’s not perfect at around 7 dB of loss but i’d say that’s still acceptable.
I don’t know what the loss for your current coax is though, so you’d have to check if it’s a significant improvement.
This change would not be due to the connector but the coax quality and loss per ft.

Doing an installation with long cable runs might be better suited to your own feed system where you don’t have to worry about the builtin GPS and can install a filtered LNA at the antenna.

That all said your current range isn’t terrible and i suspect that you gained some planes to the northwest?

Edit: I suppose for around 150 US dollars you could get 150 ft of LMR-600, that would almost half the attenuation compared to LMR-400.

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Yes.

(it’s further complicated by the GPS chip monitoring the current draw on the bias-T to check antenna health, so putting something else in the path is likely to cause false fault indications)

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