Shure PG4 - PG1 Bodypack Transmitter; PG1 Transmitter Overview and Usage; PG1 Transmitter Battery and Gain

5
25A1104 (Rev.1)
RF & AUDIO BLOCK DIAGRAM
From µP Controller
A
udio & Muting Circuitry
Audio Proc Muting
Unbalanced
Balanced
18 kHz LPF
Tone Key
Detector
N
oise
Squelch
Detector
To uP
To uP
Buffer
Audio
Outputs
Buffer
Buffer
2
nd
MIXER
110 MHz
SAW Filter
2
nd
LO
VCO
Sanyo
LA8662V
2
nd
IF/Detector
10.7 MHz
LMX2335
LTM PLL
From
1
st
Mixer
To uP
Buffer and
DC gain
LPF
10.7 MHz
ceramic filters
Audio
output
RSSI
output
R
F – 1
st
and 2
nd
IF
2
nd
mixer and detector