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Model LMP1A User Guide
CONNECTING THE LMP1A TO NON-BIASED AUDIO RADIOS 1. Remove the screws that secure the LMP1A cover to the chassis and lift the cover away. 2. Refer to Figure 2 and connect a dynamic micorphone, such as a Shure Model 515, to the LMP1A input terminal as follows: � White mic lead to LMP1A Audio In � Green mic lead to LMP1A Ground � Shield to LMP1A Ground 3. Connect the LMP1A output terminal to the radio input as follows: � LMP1A Audio Out to Radio Microphone High Input � LMP1A Ground to Radio Microphone Low Input or Ground 4. Connect the LMP1A external dc bias terminal to the positive terminal of the radio power supply. 5. Connect the LMP1A ground terminal to the negative terminal of the radio power supply. 6. Reinstall the LMP1A top cover.
GENERAL
The Shure Model LMP1A is a multi-purpose level-matching preamplifier designed for two-way radio communication applications. The LMP1A allows Shure dynamic communication microphones to be used with many popular two-way radios and remote control devices. The LMP1A can operate on biased audio supplied by the radio or 12 Vdc provided by an external power supply. Its output can be adjusted to match the inputs of many two-way radios. FEATURES: � � � � � Compact design Input and output terminals for easy connection to microphones and radios Adjustable gain Uses either biased audio or external 12 Vdc power Heavy duty die cast aluminum case
GND GND SHIELD GREEN WHITE
INPUT
FROM DYNAMIC MIC
OUTPUT
TO RADIO MIC IN
AUDIO IN MIC HI MIC LO
EXT DC BIAS AUDIO OUT GND
LMP1A CONNECTIONS FOR BIASED AUDIO RADIOS FIGURE 1
GND GND
SHIELD GREEN WHITE
INPUT
FROM DYNAMIC MIC
INSTALLATION
CONNECTING THE LMP1A TO BIASED AUDIO RADIOS 1. Remove the screws that secure the LMP1A cover to the chassis and lift the cover away. 2. Refer to Figure 1 and connect a dynamic microphone, such as a Shure Model 515, to LMP1A input terminals as follows: � White mic lead to LMP1A Audio In � Green mic Lead to LMP1A Ground � Shield to LMP1A Ground 3. Connect LMP1A output terminals to the radio input as follows: � LMP1A Audio Out to Radio Mic High Input � LMP1A Ground to Radio Microphone Low Input or Ground. 4. Reinstall the LMP1A top cover.
OUTPUT
12 VDC POWER SUPPLY TO RADIO MIC IN
AUDIO IN + PWR MIC HI � PWR MIC LO
EXT DC BIAS AUDIO OUT GND
LMP1A CONNECTIONS FOR NON-BIASED AUDIO RADIOS FIGURE 2
