User's Manual

11-4 68P81093C75-A
Figure 18. PDR 3500 Schematic—Part I (Sheet 1 of 2)
1
1
1
1
11 800 MHZ0
0
0 UHF R30
1
28V RIPPLE
FAN ALARM
FAN ON
BAT V
0 UHF R4
AC FAIL
BAT TEMP
UHF R2
POWER SUPPLY +
00
23
ANTENNA RELAY
SETTINGS FOR S1
POWER SUPPLY -
EXTERNAL DC +
EXTERNAL DC -
FAN
0
BAND
28V
14V
0
MOD FAIL
VHF R1
VHF R2
UHF R1
1
0
1
0
0
01
0
0
0
0
1
0
IPA
4
HS TEMP
PA POWER
C41
100pF
1K
R6
R59
100
U5
4
5
6
U5
MC74HC86
1
2
3
MC74HC86
C109
LN+5
LN+5
1%
R33
22.6K
100pF
LN+5
15pF
C83
3.9K
R61
R62
9.6V
P10
4
10K
39pF
C58
MC33074
U20
6
5
7
1%
10K
R2
A+
LN+5
1%
R17
10K
10K
R18
R52
10K
100pF
LN+5
MC74HC86
U5
12
13
11
C110
6
1%
R5
11.5K
5.62K
R82
1%
P10
100pF
C102
R84
1%
10K
R85
1%
10K
VFWD_XLATED
10K
1%
R38
10K
1%
R39
100pF
C101
32.4K
R64
1%
P3
1
470pF
C100
C99
470pF
C67
100pF
100pF
C68
L13
220nH
LN+5
C95
470pF
R16
15K
1%
16.2K
R40
1%
5.62K
R32
R51
10K
9.6V
15K
6
R60
2
MC74HC32A
U9
1
2
3
U4
MC74HC32A
4
5
100pF
P1
R63
3.01K
U15
MC33074
9
10
8
C69
P4
1
1%
1
A+
P3
2
P2
P6
2
P7
1
P7
2
J9
31
P6
1
S1
81
S1
72
39pF
220nH
L2
LN+5
P5
3
C59
15pF15pF
C54
A+
C52
R43
20K
LN+5
1
2
3
MC74HC32A
U4
12
13
11
P9
1
MC74HC32A
U4
9
10
8
U4
MC74HC32A
Q4
D
G
S
LN+5
10
9.6V
P10
10.5K
R31
1%
MC33074
U15
13
12
14
470pF
C106
10K
R9
Q3
D
G
S
LN+5
DOUT
16
EOC
19
SCLK
18
VAG
13
VDD
20
VREF
14
VSS
10
AN4
5
AN5
6
AN6
7
AN7
8
AN8
9
AN9
11
CS*
15
DIN
17
U8
AN0
1
AN1
2
AN10
12
AN2
3
AN3
4
LN+5
P5
1
LN+5
P5
2
LN+5
1%
LN+5
15pF
C53
2
Y2
4
Y3
P4
2
5.62K
R3
13
X
12
X0
14
X1
15
X2
11
X3
3
Y
1
Y0
5
Y1
10
A
9
B
ENABLE*
6 8
GND
VCC
167
VEE
P2
2
U1
MC74HC4052
2
P1
1
A+
Y3
4
P9
2
P9
3
X0
12
X1
14
X2
15
X3
11
Y
3
Y0
1
Y1
5
Y2
2
U1
MC74HC4052
9
A
10
B
9
6
ENABLE* GND
8
16
VCCVEE
7
X
13
MC33074
U15
2
3
1
P10
2
P10
8
R4
22.1K
39pF
C56
470pF
1%
470pF
C42 C45
470pF
C39
0.1uF
C38
R50
100pF
C113
20K
100
R14
C1
0.1uF
D2
U15
MC33074
6
5
7
Q1
D
G
S
20K
R42
P9
5
U20
MC33074
13
12
14
P9
4
C55
39pF
P8
1
20K
R74
1%
A+
S1
54
R102
11.5K
LN+5
3.01K
R103
D
G
S
1%
R101
10.5K
1%
Q6
LN+5
39pF
C85
73
20K
R88
LN+5
D3
J9
C2
470pF
Q5
D
G
S
2
3
1
MC74HC132AD
U16
9
10
8
MC33074
U20
C103
100pF
22.1K
2.21K
1%
R41
1%
R1
3
C57
39pF
R78
33.2K
S1
6
2.49K
1%
R77
1%
C97
LN+5
C96
470pF
4
P11
2
LN+5
0.1uF
1%
P11
1
P11
7
10.5K
R99
1%
11.5K
R100
U22
MC33074
6
5
27.4K
R83
1%
U5
MC74HC86
9
10
8
22.6K
R81
1%
470pF
R79
20K
C98
D
G
S
P8
3
Q2
C60
100pF
R45
10K
R44
20K
R105
2.43K
13.7K
78.7
R104
1%
1%
11
U22
MC33074
2
3
1
1%
R106
R80
5.62K
U16
MC74HC132AD
12
13
20K
R98
1%
SW3INV
SW2
A5
PTT_REQ_INV
SW3INV
SW3
SW2
SW1
SW1
LED_RED
LED_GREEN
LED_RED
PTT_SWITCH
RESET_SWITCH
LED_GREEN
PTT_REQ_INV
SW3
SPIMOSI
SPIMISO
SPICLK
A4
A3
A0-CS1
A1-CS2
A2
VFWD_FROM_PA
VCONTROL
VTEMP_FROM_PA
VFWD_FROM_PA
ANTRYKREYEDA+
3
1
2
4
5
6
9
7
10
13
Control Voltage Translation: V
o
= 1.38 • V
i
+ 3.46.
When the Exciter is not present, Q6 grounds the control voltage to
prevent the PA from keying. When the Exciter is present, J9-73 is
grounded, turning Q6 off and enabling the control voltage.
Q4 and Q5 provide keyed 9.6V to the PA when PTT is detected.
R61 biases Q5 to turn off at a lower gate voltage.
Power Supply feedback A/D converter.
Low DC voltage detection circuitry with hysteresis. With switch 4
OFF, U16 pin 8 goes low when V
DC
drops below 11.0V and goes
back high when V
DC
returns to 11.36V. With switch 4 ON, the
thresholds become 12.1V and 12.5V, respectively. R99 through
R102 are necessary because U22 operates at 9.6V.
Power Supply SPI bus address recognition. Address is 011001.
Power/Tx LED driver circuit. The operational amplifier acts as a
comparator to detect forward voltage from the PA. If forward voltage
is present, the red LED is turned on, otherwise the green LED is
turned on.
Circuit to OR the PTT signals from the Station Control Module and
the top-panel PTT/reset switch. C107, in concert with R55, serves
to debounce the switch.
Forward Voltage Translation. U12, U19, and peripheral circuitry
translate the Forward Voltage (V
fwd
) from the PA to the Exciter. The
appropriate translation circuit is selected by the positions of
switches 1, 2, and 3 of S1. The equations implemented are as
follows:
Forward Voltage Translation Equations
Range DIP Settings Equation
VHF R1 & R2 000x/100x V
o
= 1.95 • V
i
- 2.5
UHF R1 & R2 010x/110x V
o
= 0.8 • V
i
- 0.6
UHF R3 001x V
o
= 0.93 • V
i
- 0.6
UHF R4 101x V
o
= 0.8 • V
i
- 0.6
800 MHz 011x V
o
= 0.83 • V
i
- 0.6
1
2
3
4
5
6
7
8
9