Tandy Radio Shack Realistic PRO-2021 User Manual

BLoeK DIAGRAM
IANTI
~ OSC,MIXER,IFAMP- kj
VHF RF AMP MIX
IF AMP
~
CRYSTAL
-
(LOW, AIR, Hl)
014
FILTER
OUADRATURE DET
01,2,3 01"-10,57
XF-I
NOISE AMP
VRI
IC-2
ISOUELCH!
UHF RF AMP MIX
~
....-....
011"" 13
04,5
AM IF AMP OET &tANL
AM/FM SW
I--
I-
-
& SO
015,16
024,25
.--i
IC3,5(3/6)
017
VR2
VCO(LOW)
BUFFER
~
014,15
AMP
f-- I--
IVOLUME I
,...
06
07
/
/
/
(
1:~
I
I
VCO(AIR, Hl,
TRIPLER
IIHEADPHON
~
UHF)
017
'-
ZEROMATIC
AUDIO
016
& KEY TONE
AMP
I
09
I--
08
IC5,6 020,21
IC-9
!4ä
6V
l ISPEAKERI
(
I
I
UHF
AIR
I
ITAPE OUT1
I
Hl LOW
,. ____ J
EL DRIVER
f f f t
/
/
T15, Q30
/
/
BAND SELECT
VOLTAGE
/
MEMORY
IC-8 REGULATOR
....f.
RECTIFIER
--0
IC-12
..........-0 ""0---'
043
I
010,11,12,13
IC-4
SW2
ACI20V
EL-I
f
(240V)
~
CPU
VOLTAGE
CPU
PRESCALER
KEYBOARD
r---
IC-11 IC-I
!4"
CONTROL REGULATOR
~
'-
018,19 026
IC-IO
1
t
I
1
5V
LOW BATT
PLL
-- LOW-PASS
OC-DC CONV
LCD
DET
L.,
FILTER
-
025,26
027,28,29
IC-7
f----
022,23,24 036,37
IBACK upi
t
BATT
SWI
IRESET
swi
-4-

Tandy Radio Shack Realistic PRO-2021 Specifications

General

Type	Scanner Receiver
Modulation Types	AM, FM, WFM
Channels	200
Power Supply	13.8V DC
Dimensions	2 7/8 x 7 1/2 x 7 1/4 inches (72 x 191 x 184 mm)
Weight	3.3 lbs (1.5 kg)
Memory	200 channels