Lectrosonics SR170LE - Manual (Page 2)

RELAY CONTACT
This locking micro-jack provides a relay driver (open collector) triggered by the RF circuit in the receiver.
When the RF LED lights up, the center conductor on the jack is shunted to ground. This provides a
switch to trigger external devices in conjunction with the RF carrier from the transmitter. For example, the
VCR may be activated to start tape movement when the transmitter is turned on outside of the patrol car.
There is a slight delay in the turn-on and turn-off. This is intended to prevent interruptions in recording, or
accidental turn-on that may be caused by RF interference.
Maximum voltage for the relay power supply cannot exceed the receiver power supply voltage. Maximum
current handling capacity in the “ON” (shunted) mode is 300 mA. This limit is set by an auto-reset thermal
fuse. Reverse polarity protection is provided by a diode and the thermal fuse. If the protection circuitry is
activated, it may be necessary to wait 10 seconds or so after power is removed to allow the thermal fuse
to reset.
F R O N T P A N E L
®
SR170LE
by LECTROSONICS
RF POWER -20 0dB
R E A R P A N E L
D I O O U T P U T
L C O N T R O L
A U D I O
O U T P U T
3 . 5 m m M I N I P L U G 1 2 V
R E L A Y C O N T A C T
N E G A T I V E ( - )
0 O H M B N C
A N T E N N A
P O S I T I V E ( + )
A U
L E V E
D C P O W E R
The DocuCam SR170LE receiver is manufactured by:
LECTROSONICS, INC.
PO BOX 15900
RIO RANCHO, NM 87174
Phone: (505) 892-4501
WATS: (800) 821-1121
FAX: (505) 892-6243