Troubleshooting COM / Sirius XM Reception Issue

[lrobichaux]

Trying to troubleshoot poor COM transmission and garbled Sirius XM reception. For those of you with CC with factory build assist and two COM antennas, how far is the placement (distance) from each other and from the GPS antenna? Thinking that this may be a problem on my kit built EX-3. Thanks in advance.

 

[Neal]

The antennas on the inner side of either wing with dual com should be installed with a ground plane. The GPS antenna is over the shoulder harness anchor location above and aft of your head. I had problems with comms on my last plane, probably no different on this newer plane and sometimes had to switch between com 1 and 2 if I experienced troubles. I think the issue stems from the fact our antennas are top side mounted vs bottom of the aircraft and can be subject to blocking.

@Tsquared had an issue with his GNC 355 and had to adjust the gain. I told him what mine was set to but can't remember the discussion. He had dialed his above where mine is set but you may want to experiment with the gain control on the GNC 355 in the config area. Maybe @Tsquared can chime in to help with what he learned.