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Troubleshooting open squelch

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PostPosted: Mon Jun 04, 2018 7:43 pm    Post subject: Troubleshooting open squelch Reply with quote

I have a GlaStar with a pretty simple panel. Standard 6-pack, a Garmin
300XL GPS/Comm, a Garmin GTX320 transponder and a Sigtronics 2 place

Step one of a probably multi-year upgrade is to get rid of the vacuum
system and go a little glass. I spent the past month (very part-time)
pulling all the vacuum instruments and installing a Garmin G5 in place
of the AI. It took some work to find a quiet spot for the GMU11
magnetometer. The strobes were a big interferer and part of my
mitigation was to pull the old wiring and replace with new 3 conductor
shielded (I had previously replaced the Whelen strobes with Aveo LED units.

While I had the plane apart I also installed a uAvionix EchoUAT ADS-B
In/Out and a WAAS GPS receiver.

I finished the installation Saturday and yesterday I took the plane
outside to calibrate the remote compass on the compass rose. To my
surprise I'm getting constant static on the comm. I can hear other just seems the squelch got disabled or is being overcome by

I had made one change to the radio--I attached a single wire, RS-232
out, from it to the G5 for position data.

I spent several hours troubleshooting today. First, I pulled the fuses
on all the devices I added. No change. I disconnected the RS-232 wire.
No change. I did the testing with the plane in the hangar and everything
except the master and avionics switch off. I even tried pulling each
circuit breaker (the legacy equipment). Nothing effects it.

I went into the 300XL configuration mode and the first screen shows you
all the buttons and lets you verify the unit is detecting button
presses. The 300XL has a squelch on/off button but no other adjustments.
And it's always supposed to power on with squelch on.

At this point I'm completely baffled. Any ideas on other things to look
at? Thanks for your help.


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