Originally Posted by BruceW
I have a Garmin Aera 660 with SL40 for comm.
Was working fine and the 660 connection to the SL40 allowed for frequency output. Nice.
Did a software and database upgrade last month, now not getting the frequency output to the comm. Double checked manual and serial data format and all is same as before.
Did the 660 software upgrade change something else? Any other things to check before I call Garmin? Thanks.
I retested my Aera 660 V3.70 connection to a GTR 200 radio (uses same VHF Out protocol), and everything is working great including manually pushing frequencies to the GTR 200 and automatic transmission of closest and flight plan airport frequency groups.
There could be some issue specific to the SL40, but more likely a wiring or configuration problem.
You should also make sure that your contacts are clean and bright between the Aera 660 and the mount. I once had a problem with intermittent connections to the GDL 52R on one of the two Aera 660 serial ports. I cleaned the contacts with alcohol, and everything has been fine since then.