GPS Antenna Wire

I'm using RG400 cable from my GPS antenna on shelf (forward side of firewall) and want to run those cables through the same pass thru where my positive power from shunt to buss bar go thru (#8 wire). Will there be any interference in the GPS signal if I run these next to each other?

Thanks

I would keep them separate.

Rule of thumb is to keep power wires separate from signal wires.

Erich

From the GPS' point of view, I don't think it will care about alternator noise imposed on the antenna wire. The frequencies are too far removed from each other to matter. But, the coax cable could bring in noise from the feeder wire and put it on the avionics ground, where it would be most unwelcome to other boxes.
See Aeroelectric Connection, chapter 16 (Electromagnetic Compatibility) for more information. The primary coupling mode for high current wires is magnetic, which will go right through shields in close proximity, or even impose the noise current on the shield itself!