Power446 Level Diagram; Tx Part; Rx Part - HYT POWER446 Service Manual

5

TX PART

D
12mVrms
AN29160 AN29160
MICROPHONE MICROPHONE
Mic Amp Mic Amp AF HPF AF HPF
40
Mic Mute Mic Mute
C
AF

RX PART

-120dBm -122dBm
B
TUNE BPF
BPF BPF
A
5
4

POWER446 Level Diagram

450mVrms 150mVrms -45dBm
VCO
Q100 Q100
C112 C112 2SK508NV 2SK508NV
C C
1
SF Amp SF Amp
LMT LMT
51
D104 D104
Q101 Q101
2SK508NV 2SK508NV
VR200 VR200
47K 47K
-10dBm
-104dBm -108dBm
LNA TUNE BPF RF MIXER
Q500 Q500 Q501 Q501
AT41511 AT41511 3SK318 3SK318
BPF BPF 3
2
RF
4
3
-26dBm -8dBm
buffer stimulator
Q400 2SC5108 Q400 2SC5108
Q104 Q104
Q102 Q102 D400 D400
C130 C130 C141 C141
C400 C400
1
1
D500 D500
RF
LPF
-98dBm -103dBm -67dBm
-69dBm
1stIF BPF AN29160 AN29160
2ndIF 2ndIF
BPF BPF
23 23
IFAmp 1 IFAmp 1 IFAmp 2 IFAmp 2
21
MIX2 MIX2
DET DET
38.85M 38.85M
IF
53
3
2
3dBm 15dBm 22dBm
power AMP
Q401 2SK4988 Q401 2SK4988
Q402 Q402 Q403 Q403
RD01 RD01 RD07 RD07
C402 C402
C405 C405 C412 C412
1
2 2
attenuator
step1to23
250mVrms 200mVrms
de-emphasis de-emphasis
25 25 29 29
44 44
AF HPF AF HPF
AF mute AF mute Volume Volume
52
AF
2
1
D
29dBm 27dBm
LPF LPF
C429 C429
C
1W(BTL)
B
AF AMP AF AMP
TDA2822 TDA2822 16Ω IW 16Ω IW
SW SW
A
1