(No.RA033<Rev.001>)1-17
2.6.4.4
2nd-IF circuits
Filtered first IF signal is amplified by the IF amplifier (Q605) and then applied to the IF system IC (IC601). IF system IC provides a
second mixer, AGC amplifier, and RSSI (Received Signal Strength Indicator).
The second mixer mixes the first IF signal with the 57.6 MHz of second local oscillator output and produces the second IF signal of
450 kHz.
The second IF signal is passed through the ceramic filter to reject the adjacent channel signal.
It passes through IC603, CF601, IC604,CF605 and IC609, if the modulation mode is Analog_Wide.
It passes through IC603, IC602, CF602, IC605, CF606 and IC610, if the moduration mode is Analog_Narrow and NXDN Narrow.
It passes through IC603, IC602, CF603, IC606 and IC610, if the modulation mode is NXDN Verry-Narrow.
Filtered second IF signal is amplified by the IF system IC IC601.
The signal from IF system IC IC601 is processed by the MPU which is in the Control unit (XC1-064).
Fig.14 2nd-IF circuits
SW
SW
SW
SW
CN641
IC601
NJM2287V
CF604
L72-1028-05
IC607
AD8051ART
CF601
L72-1028-05
CF602
L72-1027-05
CF603
L72-1041-05
IC603
TC7W53FKF
IC602
TC7W53FKF
IC610
TC7W53FKF
IC609
TC7W53FKF
DMR_SW
SW
33IF
W/N
SW
33IF
SW
N/VN
SW
33IF
IC608
TC7W53FKF
Q606,Q608
SSM3J36TUT
CF605
L72-1028-05
33IF
CF606
L72-1027-05
Q607 EM6M2
Q608 SM3J36TUT
IC604 AD8051ART
IC605 AD8051ART
IC606 AD8051ART
Q609
EM6M2
ATT
IF IC
Summary of Contents for NXR-5700
Page 121: ...MEMO ...