Level Diagram - Kenwood NX-800 Service Manual

NX-800

LEVEL DIAGRAM

Radio Frequency
–118dBm –120.5dBm –114.5dBm
ANT
RF AMP 1st MIX DBM
D212,D213 Q210 D207~D210
BPF BPF
Buff AMP Buff AMP Buff AMP
Q9 Q10 Q208
RX VCO BPF
0dBm
5.2mVrms
4.0mVrms 48.2mVrms
MIC
(MIC SUM1) (MIC SUM2)
6 7 6
IC709 IC706
100
58.05MHz
–112.5dBm –121.5dBm –118.0dBm –104dBm
IF AMP IF AMP FM SYSTEM IC
IC204 XF202 Q205 Q204 IC202
MCF
CF201
CF202
W:-85.5dBm
0dBm
N:-83.0dBm
SG input level for 12dB SINAD are obtained Measured by
connecting SG to each point via a 0.01µF capacitor.
W:244mVrms W:244mVrms
69.2mVrms N:122mVrms N:122mVrms
(ASIC) (MOD SMF) (MOD SUM)
1 K2 K3 6 1 2
IC510 IC702 IC709
MIC input : 3kHz DEV. (Wide), 1.5kHz DEV. (Narrow) at 1kHz MOD.
Transmitting frequency : Center frequency
450kHz
–72.0dBm –82.0dBm –82.0dBm
IF AMP
CF203 IC201 (ASIC)
E1
IC510
CF
CF
W:-92.0dBm
N:-93.0dBm
W:354mVrms W:198mVrms
N:177mVrms N:99mVrms
(EVOL)
DEV, BAL (VCO_MOD)
1 1 3 6
IC712
MOD TX VCO
VCTCXO
MB
19.2MHz
LEVEL DIAGRAM
Audio Frequency
186mVrms 226mVrms 226mVrms
(RXAF SMF) (RX SUM)
K1 3 4 6 7 13
IC701 IC711
AF VTVM
AF level obtained when the AF output level is adjusted for 4.00V/4Ω
with the front panel AF VOL control. Measured with AF voltmeter
connected to the external speaker jack, receiving a –53dBm SSG
signal modulated at 1kHz, DEV. WIDE 3kHz (NARROW 1.5kHz).
W:198mVrms
N:99mVrms
(TX VCO)
7
IC5 Q6
-2.5dBm 6.5dBm +17.5dBm
Buff AMP Drive AMP Drive AMP Drive AMP Final AMP
Q9 Q10 Q101 Q102 IC102
Gate
bias
PC
DC DC
AMP AMP
MP
IC101 IC103
NX-800
96mVrms 4.00Vrms
(EVOL)
VOL=20
(SP AMP)
14 1 4
IC712 IC715 J701
30W
ANT
D103,D106,
D216
SW ANT Filter
D108 D109 D110
DET DET DET
101