Hytera PD362, Service Manual

Page: 117 / 141

Uc (430
‐
470 MHz)
Block Diagram
41
10.5
FGU Circuit
RX_VCO
PLL Sky72310
Buffer
Amp T/R_Switch
RF feedback LPF
TX_VCO
Mod_1
Loop Filter
VC_TXCO
Mod_2
PN:
≤
-80 (dBc/Hz)@1KHz
PN:
≤
-112 (dBc/Hz)@12.5KHz
PN:
≤
-120 (dBc/Hz)@25KHz
PN:
≤
-136 (dBc/Hz)@100KHz
PN:
≤
-145 (dBc/Hz)@1MHz
Two Point modulation ：
0.1
～
5KHz modulate
ripple ≤ ±0.5dB
Fc=19.2MHz
To TX
To Mixer
2SC5108
Gain
≤
5dB
isolation
≥ 20
dB
Current ≤ 4 mA
2SC3356
Gain ≥ 10dB
isolation
≥ 15
dB
Current ≤ 10 mA
3dB BW
≤
3.5K
Phase Margin:30-55°
A=0.1Vpp~2.0Vpp
S21=-3dB
Fpass=500MHz
Fstop=800MHz
Astop=40dB
Kv ≤ 30MHz/V
CV=0.8
~2.3V
F=361.15 ~401 .15MHz
PN
≤ -116dBc/Hz@12.5KHz
Kv ≤ 30MHz/V
CV=0.8
~2.3V
F=400 ~440 MHz
PN
≤ -116dBc/Hz@12.5KHz
3.0v for core&Vp
Compare frequence:4.8MHz
Prescaler Level
：
50~250mVpp
Pi Attenuator
isolation
=1
dB
FGU Close Loop:
Residual noise deviation ：
300
～
3KHz:
≤
50Hz
50Hz ～ 15KHz: ≤ 100Hz
Reverse Isolation
：＞
40dB
（
Buffer to Amp
）
RF_OUT:
≥ 0 dBm （ to RX)
≥ -1 dBm （ to TX)