Garmin Apollo SL30 COMM Installation Manual

Also see for Apollo SL30: Quick reference guide Pilot's guide Pilot's guide Installation

InstallationApollo SL30 Installation Manual 15M ICROPHONE I NPUTSMicrophone input connections should be made using a twisted pair shielded cable. Attach thesignal ground to the mic ground pin on the rear connector and connect the shield to the rearconnector plate.TRANSMIT KEY I NPUTThe TxKey input on the rear connector must be pulled low to ground to enable thetransmitter. This input should be connected to a microphone or yoke mounted momentarypush button switch.I NTERCOM S ELECTOR S WITCHThe SL30 includes a voice activated intercom function that can be enabled by an externalcontrol switch. This is an optional connection.When making connection for the intercom selection, connect the intercom selection input to aremote mounted normally open switch (an alternate action switch can be used). Connect theother terminal of the switch to ground. The intercom function is enabled when the input ispulled low to ground.REMOTE FLIP /FLOP I NPUTThe SL30 includes a remote flip/flop input. This is an optional input that can be connected toa remote mounted (such as on the yoke) momentary push button switch which pulls the inputlow to ground. The remote flip/flop input will only toggle the Comm frequencies when Commfrequencies are displayed and will only toggle NAV frequencies when NAV frequencies aredisplayed.A NTENNA I NSTALLATION AND C ONNECTIONSCOMM AND NAV ANTENNASThe SL30 requires a standard 50Ω vertically polarized Comm antenna and a horizontallypolarized NAV/VOR/Localizer/Glideslope antenna. Follow the antenna manufacturer’sinstallation instructions for mounting the antennas. The Comm antenna should be a standardComm antenna that operates on Comm frequencies between 118.00 and 137.000 MHz. TheNAV antenna should be a VOR/Localizer/Glideslope NAV antenna that receives VORfrequencies between 108 and 117.95 MHz, and localizer frequencies between 108 and 112MHz and glideslope information between 328.6 and 335.4 MHz.The NAV and Comm antennas should also be mounted as far apart as practical from the ELTantenna, preferably one on top and the other on the bottom of the aircraft fuselage. SomeELTs have exhibited re-radiation problems generating harmonics that may interfere with GPSsignals. This can happen when the Comm (SL40 or any other Comm) is transmitting oncertain frequencies such as 121.15 or 121.175 MHz, which may cause the ELT output circuitto oscillate from the signal coming in on the ELT antenna coax.The antenna coax cable should be made of RG-142B or a comparable quality 50Ω coax.Assembly instructions for the rear coax connector are included in Figure 6.