splitting a GPS

[larywil]

I hope to istall a single axis trio A/P in my RV-3B. Will I need a separate GPS antenna, or can I somehow use a splitter on
the Garmin antenna that feeds my ECHO ADS-B in? If I need a separate antenna, can it be placed very close to the Garmin,
which is just behind the roll-over bar. Thanks in advance.

 

[BobTurner]

I hope to istall a single axis trio A/P in my RV-3B. Will I need a separate GPS antenna, or can I somehow use a splitter on
the Garmin antenna that feeds my ECHO ADS-B in? If I need a separate antenna, can it be placed very close to the Garmin,
which is just behind the roll-over bar. Thanks in advance.

I’m confused by this post. The Trio does not have an internal gps receiver. If you want it to track a gps course you’ll need to feed that data to it from a gps. Can you use a gps receiver you already have, for adsb-out? Maybe.
Generally speaking splitters are discouraged for gps antennas:
1. Different receivers may have different gain requirements. Antennas should be matched to the receiver.
2. Most gps antennas are fed dc power up the coax, to power a small low noise amplifier. Special splitters are needed to pass the dc unattenuated, while keeping the dc from 2 different receivers from fighting each other.
3. Some antennas have demonstrated a failure mode where they radiate a signal and block other nearby antennas.
Not saying it can’t be done, but not easy.