Garmin SL40 CONTROL INPUTS, SERIAL INTERFACE, INTERCOM PERFORMANCE, ANTENNA REQUIREMENTS

	Specifications
Microphone input .....................................	Two inputs, standard carbon or dynamic mic with
	integrated preamp providing minimum 70mv rms
	into 1000: load
Modulation capability...............................	85% with 100mv to 1000mv rms microphone input
	at 1000 Hz
Audio frequency distortion .......................	< 10% at 85% modulation at 350 to 2500 Hz
Audio frequency response ........................	< 4db variation with 350 to 2500 Hz, 85%
	modulation
Carrier noise level.....................................	> 35 dB down
Sidetone output .........................................	up to 280mW into 100:, 120mW into 500:
Duty cycle .................................................	100%
Stuck mic time-out....................................	35 second time-out, reverts to receive
INTERCOM PERFORMANCE
Microphone input .....................................	Two inputs, standard carbon or dynamic mic with
	integrated preamp providing minimum 70mv rms
	into 1000: load
Headphone audio output level ..................	280 mW into 100:, 120 mW into 500:
AGC characteristic....................................	output varies < 3 dB with input of 100mv rms to
	1000mv rms
CONTROL INPUTS
Transmit key .............................................	Input pulled low to ground to enable the transmitter
Intercom select..........................................	Input pulled low to ground to enable the intercom
	function

ANTENNA REQUIREMENTS

The Apollo SL40 requires an antenna meeting the following specifications. Standard 50: vertically polarized antenna with a VSWR < 2.5:1.

SERIAL INTERFACE

RS-232 ......................................................	Defined in Appendix E - Serial Interface
	Specifications

Apollo SL40 Installation Manual 17