Lectrosonics H185 - Manual (Page 4)

CONTROLS AND FUNCTIONS
The H185 may be used with a wide variety of microphones. The 3-pin XLR type connector on the
H185 allows the transmitter to be used with any dynamic microphone, as well as many two wire
positive bias lavalier systems (such as those systems supplied by Lectrosonics).
INPUT JACK
Standard 3-pin Switchcraft XLR type. Pin 2 is signal, pin 3 is signal ground, and pin 1 is case ground
(see schematic below). The H185 is self-locking onto a standard microphone. The XLR connector is
permanently bonded to the metal collar, and is not normally replaceable. The electret bias is 5 Volts at
1mA or less. The bias is connected in a "phantom" manner and will not interfere with any standard
balanced microphone. If severe noise is experienced when the microphone is moved with respect to
the H185, the cause is an unbalanced condition between pins 2 and 3 of the microphone.
Figure 2 - Input Jack Schematic
POWER/MUTE SWITCH
Turns the battery power on and off. The center position is an "audio mute" which should be used when
setting the MIC LEVEL control. The "mute" position disconnects the audio signal from the transmitter
and allows you to adjust the audio modulation level without the possibility of feedback. When turning
the transmitter on, pause for a moment in the "mute" position. This will prevent a turn-on surge from
occurring (a "thump" sound).
POWER ON/OFF LED
Glows brightly when battery is good. A weak or dim LED means that the battery is weak, and has
about an hour of operation left. If the LED fails to light, the battery should be replaced. The power
LED should light up in both the "mute" and "on" positions of the POWER/MUTE SWITCH.
3