[TG] [TG11] Axiom Pro External GPS Antenna

[Tom - Raymarine - Moderator]

Hello natedawgsem,

Quote:Why is it not recommended to re-terminate the TNC connector on the GA150? If ou have the correct TNC connector and crimp tool there shouldn't be an issue. Does the length of the cable play a role in the antennas effectiveness?

That depends on the quality of your termination. GPS signals are low-power (see where GPS sits in the scale at https://en.wikipedia.org/wiki/Orders_of_...de_(power)) and it takes very little to either alter the impedance mismatch in the cable which is required to transfer that signal back to the GPS receiver in the display, or to mask that signal in noise picked up on the cable. A connection that looks fine by eye and measures fine for DC resistance on a multimeter might be anything but fine to a low-power, 1.5GHz RF signal.

My general answer to this sort of thing is that if you're an RF tech then you know the answers better than I do, and if you're not then you shouldn't be doing it. I wouldn't. And there's no warranty on the antenna or technical support if you have GPS problems after doing so.

Quote:Once connected to the unit, will it show the device under the "GPS" network devices menu?

This is a common question. No, the GA150 is a passive antenna with no digital communications with the display and it will not be listed as a device in any diagnostic. The only way to tell it's there is the drop in GPS signal strengths in the Satellite Status page (top-left on the Home screen in LH3, Satellites) when you unplug it.

Regards,
Tom