Shure PG4 Service Manual

9
25A1104 (Rev.1)
The microprocessor reads the RSSI level from an ADC several times a second when the PG4 is unmuted, to predict if a switch is neces-
sary to avoid an audible dropout. Thresholds were calculated from the above RSSI curve.
PG4 RSSI Curve
0.5
1
1.5
2
2.5
-120 -110 -
100
-
90
-80 -
70
-
60
-50 -
4
0
-30 -20
RF Level
TP_RSSI Vdc
Series1

Shure PG4 Specifications

General

Image Rejection	>60 dB
Tuning Steps	25 kHz
Output Connectors	1/4" unbalanced
Power Requirements	12-18 VDC
RF Sensitivity	-90 dBm for 12 dB SINAD
Audio THD	0.5%