President-george.pdf

Modyfikacje trx 10/11m President George

Modyfikacje President George


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PRESIDENT GEORGE
MODYFIKACJE

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MODTFIKACJA MOCY
President George CB-Radio
50 Watt RF Power modification
To get 50 Watt RF output power for President George, replace finale transistirs Q501 and
Q502 2SC1969 with 2SC2094

Cut Collector connection and cut cooling on right side
of transistor. Solder 3 wires on the transistor for
connection to PCB.

Re-adjust VR201 and VR202 for minimum crossover.

MODYFIKACJA ODBIORNIKA
Receiver modification for President George
Varicap Tuned Circuits

In the first stages of the HF input L2 and C4 is responsible for the selectivity of the receiver. This is a narrowband

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filter, and will not cover the hole 26.065 to 28.755 frequency band with full senistivity.
To achive maximum sensitivity for 26.065MHz C4 will increase to 36pF, and for 28.755MHz C4 will reduce to
29pF. This is possible by a varicapdiode.
To cover the hole band, replace C4 with 22pF ceramic capacitor and connect the varicap tuned circuits across C4.
Connect 100kohm resistor to TP2.
Set the station to RX AM 27.405 MHz. Connect the DC Voltmeter to TP2 and adjust L405 for 2.5 Volt +/- 0.01
Volt. The VCO-Voltage will then be 4,4Volt@26.065MHz and 1,5Volt@28.755MHz. The BB134 or BB156 is
14pF@1,5Volt and 7pF@4,4Volt, and 14pF||22pF=36pF and 7pF||22pF=29pF.
Re-adjust L2 for maximum gain.
TP2
C4

Improved receive gain
Quieting of SSB and AM reception and improving gain of incoming signals is a common request from radio operators.
In the first stages of the HF input 2SC1674 (Q8) transistor can be found. This transistor is responsible for the
amplification of a small detected signals. A problems exist if the transistor itself is noisy as is such the case of the
2SC1674 when compared to other low noise packages. Along with the amplification of the incoming signals is
transistor noise. Replacement of this transistor with a higher gain, lower noise transistor greatly improves the signal to
noise ratio of your receiver.
The transistor Q8 operates at VC = 6Volt and IE= 2,5mA. We will use an 2SC2999 transistor that has higher gain
E
and lower noise characteristic. Replace 2SC1674 (Q8) with 2SC2999 (or similar low noise and high gain transistor)
to achieve this improved signal to noise ratio.
Re-adjust L2.
The gain will improved with more than 6dB with the same signal to noise ratio.

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P?YNNA REGULACJA CZ?STOTLIWOOECI
President George CB-Radio
How to modify The George for external control of VFO.

1. Disconnect the wire in the middle of the connector J408 on the principal plate (Mother board).
2. Take off (remove) the adjustable VR211 (TX-frequency adjust).
3. Connect the wire you took off (J408) and solder it at the place middle point of the adjustable VR211 (Diode side
D215)
4. Cut the middle of the wirw linking the modulation between MIC CONNECTION plate and MIC GAIN plate,
position 2 on both connectors (near the orange wire).

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5. For the part of the wire connected to the MIC CONNECTION plate; solder the other side onto J408 on the
principal plate.
6. For the part of the wire connected to the MIC GAIN plate; solder the other part on VR211 strapp side (The other
part is on the ground)
7. Replace R408 1kohm by an 500 ohm adjustable potentiometer
8. Solder the two contacts of the potentiometer MIC GAIN.9. Set MIC GAIN in middle, and adjust R408 500 ohm
potentiometer to get 27.205 MHz.10. You can now use MIC GAIN for adjusting the center frequency.

PROGRAMOWANIE
President George CB-Radio
Resetting Access Codes
a) Depress POWER NB/ANL and PROGRAM simultaneously and keep pressed down to the display lit off.
b) Release POWER and keep pressed NB/ANL and PROGRAM down: " codE " flashes in the display, and wait for
" codE " disappears.
c) Release NB/ANL and PROGRAM
d) Push MODE one times.
e) Push M1 one times.
f) Push M3 one times.
g) Push PROGRAM one times.
h) Push PROGRAM 4 times.
i) Push POWER

Changing the configuration
Programming :
a) Turn your set on by pushing POWER.
b) Turn your set off by pushing POWER,
c) Depress POWER and keep pressed down. Your set goes on and then goes off.
d) Keep POWER depressed and press PA and DIMMER simultaneously.
e) Release POWER after 5 sec. while keeping PA and DIMMER pressed down: ''codE'' flashes in the display for 5
seconds.
f) ''codE'' disappears and the display remains lit up.
g) Release PA and DIMMER.
h) Press :
M1

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for 240 ch. FM/AM/SSB (International configuration, 20 Watt AM/FM, 50 Watt SSB), the display goes out.
M2
for 40 ch. FM 4 Watt and ch. 4-15 AM 4 Watt (Germany), the display goes out.
M3
for 40 ch. FM 4 Watt (CEPT), the display goes out.
MODE
for 40 ch. FM 4 Watt (Britain and Poland), the display goes out.
PROG
for 40 ch. AM/FM/SSB 4 Watt (French standard), the display goes out.
i) Enter your access code, then press POWER. Your set is now in new configuration.

Available functions in the international configuration:
DIMMER:
In the international configuration only, the DIMMER key allows you to change band, thereby giving you the use of 240
channelsA short depression allows you to advance by one band at a time - A B C D E F A.... (6 bands, 40
channels),A longer depression allows you to do the same thing in reverse - F E D C B A F .....

SELECT.
This key allows you to go up or down by 5 KHz at a time around the reference channel. It is used in conjunction with
the CH UP and CH DOWN keys.

Display test:
a) Turn your set on by pushing POWER.
b) Turn your set off by pushing POWER,
c) Depress POWER and keep pressed down. Your set goes on and then goes off.
d) Keep POWER depressed and press M1 and CH19 simultaneously.
e) Release POWER after 5 sec. while keeping M1 and CH19 pressed down: ''codE'' flashes in the display for 5
seconds and the station vil start Display-Test.
Push M1 to stop test.

Adjustment

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VR 205 Adjust for 30 Watt AM in international mode
VR 206 Adjust for 30 Watt FM in international mode
VR 210 Adjust for 4 Watt FM in CEPT mode

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VR 601 Adjust Ecco
VR 212 Adjust FM-Deviation (FM-Modulation)
VR 207 Adjust AM-Modulasjon
VR 208 Adjust SSB-Modulation
VR 3 Adjust S-Meter for SSB
VR 4 Adjust S-meter for FM/AM
VR 213 Adjust Modulation Meter
VR 204 Adjust RF-meter (Power output)

Remote Control for President George

How to use PA-Jack for Remote Control.

P?YTKI
CZO?OWA

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ECHO

ROZMIESZCZENIE ELEMENTÓW

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ROZSZERZENIE PASMA NADAWANIA

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PLL Converter for President George
Converter for 12-meter and 10-meter HAM-Radio Band

The President George PLL-Circuit

The VCO generate 36.760MHz to 39.450MHz.
The transmit/receiver frequency is fV O- 10.695MHz.
C

The Converter

The Converter consist of an Mixer, 2.000MHz X-Tal
Oscillator and a Band Pass Filter. The Band Pass
Filter`s input controls the band select and fine
Tuning in the band.
The Converter is connected in the PLL feedback-loop, and will convert the VCO-frequency
2MHz up or down. This will let the PLL2002A to beliwe that the VCO-frequency allways is
36.760MHz to 39.450MHz.
In the High Band (10-meter) the Display will be 26.065 in Band A Channel 1, so you have to
add 2MHz to the Display value.
In the Low Band (12-meter) the Display will be 26.065 in Band A Channel 1, so you have to
subtract 2MHz from the Display value.

The President George PLL-Circuit with Converter

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The Converter will cover 10-meter band, 11-meter band and 12-meter band.
Remove C433. Insert the Converter between TP1 and PLL2002A Pin 8. Connect the Control
input to a 3-way switch, + 8 Volt at top and GND at bottom (the midle pin left open).
The VCO will now generate 34.760MHz to 41.450MHz, and the Transmitting/Receiving
frequency is 24.065MHz to 30.775MHz.
The transmit/receiver frequency is:
fV O- 10.695MHz + 2MHz for Control=LOW (10-meter band)
C
fV O- 10.695MHz for Control=OPEN (11-meter band)
C
fV O- 10.695MHz - 2MHz for Control=HIGH (12-meter band).
C

Circuit Diagram

Component
D1
D1
D2
L1
L2
R1
R2
R3
R4
R4
C1
C2
C3

Type/Value
NE612
BB809
BB809
1uH
0,6uH/0,8uH
47k
47k
47k
47k
6,8k
4,7nF
4,7nF
12-22pF

Comment
Balanced RF Amplifier and Oscillator
VHF variable capacitance diode
VHF variable capacitance diode
Drossel
Adjustable Coil

Trimmer

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C4
C5
C6
C7
C8

10pF
120pF
120pF
100pF
100pF

UK?ADY I TRANZYSTORY
DRIVER
2SC1973
Silicon NPN Transistor
RF Amplifier

The 2SC1973 is a silicon NPN epitaxial planer type transistor designed
for RF amplifiers on HF band mobile radio applications.

BCE

Application:
?

Driver Amplifier Applications in HF Band

Absolute Maximum Ratings: (TC= +25°C unless otherwise specified)
Collector-Emitter Voltage (RBE = Infinity), VCEO
Collector-Base Voltage, VC O
B
Emitter-Base Voltage, VEBO
Collector Current, IC
Collector Power Dissipation (TA= +25°C), PD
Operating Junction Temperature, TJ
Storage Temperature Range, Tstg
Thermal Resistance, Junction-to-Ambient, RthJA

55V
-V
-V
0,5A
1W
+135°C
-55° to +150°C
-°C/W

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FILTR CZ?STOTLIWOOECI
TOKO Y219SBS-344
Band Pass Filter
ELECTRICAL CHARACTERISTICS:
Center frequency, fo : 28MHz
- 3dB bandwidth at fo: 5.0MHz min.
Insertion loss at fo: 2dB max.
Selectivity @ fo + 20MHz : 45dB min.
Selectivity @ fo - 20MHz : 23dB min.
Ripple in passband: 1dB max.
Input impedance : 2,25 kohm
Input capacitance : 3pF
Output impedance : 2,25 kohm
Output capacitance : 2,5pF

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MIXER
AN612 Modulator / Demodulator / Mixer

Pin
1
2
3
4
5
6
7

Name

GND
VCC

Description
Signal input
Bias input
Signal input
Ground
Bias output
Positive Supply Voltage
Output

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MODULATOR
2SB1133
Silicon PNP Transistor
60 Volt - 3 Ampere - 20 Watt

The 2SD1133 is a silicon PNP epitaxial planer type transistor in
TO-220ML package, designed for LF Power applications.

BCE

PAMI?CI 8-BITOWE
M54995FP 8-BIT SERIAL-INPUT LATCHED
DRIVER

DESCRIPTION
The M54995 is a semiconductor integrated circuit consisting of 8stages of CMOS shift registers and latches with serial
inputs andserial or parallel outputs. It is based on Bi-CMOS processtechnology, and has 8 bipolar drivers at the
parallel outputs.
FEATURES

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l Serial input and serial or parallel output
l Serial output enables cascade connection
l Built-in latch for each stage
l Enable input provides output control
l Low supply current (standby current ICC=10mA)
l Serial I/O level is compatible with typical CMOS devices
l Driver features: High withstand voltage (BVCEO=30V)
l Wide operating temperature range Ta=-20 - +75°C
FUNCTION
The M54995 consists of 8 stages of D-type flip flops connected to8 latches.Data is input to serial input S-IN, and
clock pulses are input toclock input T. When the clock changes from low to high, the inputdata enters the first shift
register and data already in the shiftregisters is shifted sequentially.The serial output S-OUT is used to connect multiple
M54995 toexpand the number of parallel outputs. S-OUT is connected to S-INof the next stage.For parallel output.
When the clock pulse changes from low tohigh, latch input (LATCH) is high and output enable input (EN) islow the
serial input data at S-IN appears at output O1 and the otherdata already present is shifted sequentially to outputs O2
throughO8.The parallel outputs are inverted.When the latch input is held low, the latch retains the stored data.When
the EN input is high, outputs O1 through O8 all turn off. Asthe internal logic is unstable when the power is turned on,
the ENinput should be kept high (setting outputs O1 through O8 off) untilinput data is set and the internal logic is
initialized.L-GND is the GND of CMOS logic circuit and P-GND is the GND ofoutput driver circuits O1 through O8
which employ bipolartransistors capable of large drive currents.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
1
2
3
4
5
6
7

Name
T
S-IN
L-GND
Vcc
S-OUT
LATCH
/EN
P-GND
/O8
/O7
/O6
/O5
/O4
/O3
/O2
/O1
Name
T
S-IN
L-GND
Vcc
S-OUT
LATCH
/EN

Description IC405 in President George

S/RF
SWR
CAL
MUTE
PA
T/R
DIM

Description IC406 in President George

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8
9
10
11
12
13
14
15
16

P-GND
/O8
/O7
/O6
/O5
/O4
/O3
/O2
/O1

ECHO
HI CUT
NB/ANL
USB
LSB
AM
FM

PODWÓJNY PRZEDWZMACNIACZ OP.
Dual Operational Amplifier

SWITCHING TRANZISTOR 1
2SB1143 PNP Transistor
50 Volt 4 Ampere 10 Watt

The 2SB1143 is a silicon PNP epitaxial planer type transistor in
TO-126ML package, designed for Voltage regulators, relay drivers, lamp
drivers, electrical equipment.

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SWITCHING TRANZISTOR 2
2SD1667 NPN Transistor
50 Volt 5 Ampere 25 Watt

The 2SB1143 and 2SD1683 is a silicon PNP/NPN epitaxial planer type
transistor in TO-220ML package, designed for Relay drivers, high-speed
inverters, and other general high-current switching applications.

BCE
Absolute Maximum Ratings: (TC= +25°C unless otherwise specified)
Collector-Emitter Voltage (RBE = Infinity), VCEO
Collector-Base Voltage, VC O
B
Emitter-Base Voltage, VEBO
Collector Current, IC
Collector Power Dissipation (TA= +25°C), PD
Collector Power Dissipation (TC= +50°C), PD
Operating Junction Temperature, TJ
Storage Temperature Range, Tstg

50V
60V
6V
5A
2W
25W
+150°C
-55° to +150°C

TRANZYSTOR MOCY

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2SC1969
Silicon NPN Transistor
Final RF Power Output

The 2SC1969 is a silicon NPN epitaxial planer type transistor designed
for RF power amplifiers on HF band mobile radio applications.

BCE

Features:
?

High Power Gain: Gpe & gt; /= 12dB (VC = 12V, PO= 16W, f = 27MHz)
C

?

Ability to Withstand Infinite VSWR Load when Operated at:
VC = 16V, PO= 20W, f = 27MHz
C

Application:
?

10 to 14 Watt Output Power Class AB Amplifier Applications in HF Band

Absolute Maximum Ratings: (TC= +25°C unless otherwise specified)
Collector-Emitter Voltage (RBE = Infinity), VCEO
Collector-Base Voltage, VC O
B
Emitter-Base Voltage, VEBO
Collector Current, IC
Collector Power Dissipation (TA= +25°C), PD
Collector Power Dissipation (TC= +50°C), PD
Operating Junction Temperature, TJ
Storage Temperature Range, Tstg
Thermal Resistance, Junction-to-Case, RthJC
Thermal Resistance, Junction-to-Ambient, RthJA

25V
60V
5V
6A
1.7W
20W
+150°C
-55° to +150°C
6.25°C/W
73.5°C/W

Electrical Characteristics: (TC= +25°C unless otherwise specified)
Parameter
Collector-Base Breakdown Voltage
Collector-Emitter Breakdown Voltage
Emitter-Base Breakdown Voltage
Collector Cutoff Current
Emitter Cutoff Current
DC Forward Current Gain
Power Output
Collector Efficiency

Symbol
V(B )C O
R B
V(B )CEO
R
V(B )EBO
R
IC O
B
IEBO
hFE
PO

Test Conditions
IC= 1mA, IE = 0
IC= 10mA, RBE = Infinity
IE = 5mA, IC= 0
VC = 30V IE = 0
B
VEB = 4V, IC= 0
VCE = 12V, IC= 10mA, Note 1
VC = 12V, Pin = 1W, f = 27MHz
C

Note 1. Pulse test: Pulse Width = 150 3/4 s, Duty Cycle = 5%.

Min
60
25
5
10
16
60

Typ Max
100
100
50 180
18
70
-

Unit
V
V
V
3/4 A
3/4 A
W
%

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TRANZYSTOR ODBIORU

2SC1674
Silicon NPN Transistor
High frequency applications.
The 2SC1674 is a silicon NPN planar epitaxial transistor in a TO-92 type
package. This device is suitable for use as FM RF amplifier, Mixer and IF
amlifier applications.
ECB
Absolute Maximum Ratings: (TA= +25°C unless otherwise specified)
Collector-Base Voltage, VC O
B
Collector-Emitter Voltage, VCEO
Emitter-Base Voltage, VEBO
Collector Current, IC

30V
20V
4V
20mA

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Total Device Dissipation (TA= +25°C), PD
Operating Junction Temperature, TJ
Storage Temperature Range, Tstg

250mW
+125°C
-55° to +125°C

Electrical Characteristics:
(TA= +25°C unless otherwise specified)
Parameter
Forward Current Transfer Ratio
Current Gain-Bandwidth Product
Power Gain
Noise Figure

Symbol
hFE
fT
PG
NF

Test Conditions
VCE = 6V, IC= 1mA
IC= 5mA, VCE = 6V, IE
VCE = 6V, IC= 1mA, f = 100MHz
IC= 1mA, VC = 6V, f = 100MHz
B

Min
40
400
18
-

TRANZYSTOR W. CZ.

Typ
90
600
22
3

Max
180
5

Unit
MHz
dB
dB

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2SC2814
Silicon NPN Transistor
High frequency applications.
The 2SC2814 is a silicon NPN planar epitaxial transistor in a SOT type
package. This device is designed for general purpose amplifier
applications.

Absolute Maximum Ratings: (TA= +25°C unless otherwise specified)
Collector-Base Voltage, VC O
B
Collector-Emitter Voltage, VCEO
Emitter-Base Voltage, VEBO
Collector Current, IC
Total Device Dissipation (TA= +25°C), PD
Operating Junction Temperature, TJ
Storage Temperature Range, Tstg

30V
20V
5V
30mA
150mW
+125°C
-55° to +125°C

Electrical Characteristics:
(TA= +25°C unless otherwise specified)
Parameter
Forward Current Transfer Ratio
Gain-Bandwidth Product
Power Gain
Noise Figure

Symbol
hFE
fT
PG
NF

Test Conditions
VCE = 6V, IC= 1mA
IC= 1mA, VCE = 6V,
VCE = 6V, IC= 1mA, f = 100MHz
IC= 1mA, VC = 6V, f = 100MHz
B

Min
40
200
-

Typ
230
25
3

Max
270
-

Unit
MHz
dB
dB

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UK?AD NISKIEJ CZ?STOTLIWOOECI
IR3N06 Low Power Narrowband FM IF
IR3N06 is similar to MC3361, MC3371, MC3372, MC3357, LM3361, KT3361, KA3361 and
NJM3357

The IR3N06 is a low power narrow band FM detector integrated circuit for FM dual conversion of communication
equipment. The IR3N06 includes oscillator, limiting amplifier, AFC circuit, quadrature detect, operational amplifier,
squelch circuit, scan-control and muting switch.
Pin
Name
Description
1
Crystal oscillator (10.245MHz)
2
Crystal oscillator (10.245MHz)
3
Mixer output to Filter (455kHz)
4Vcc
Positive Supply Voltage
5
Limiter input
6
Decoupling
7
Limiter output
8
Quadrature Coil input
9
Demodulator output
10
IF Filter input
11
IF Filter output
12
Squelch input
13
Scan Control
14
Audio Mute
15GND
Ground
16
RF / MF input (10.7MHz)

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WZMACNIACZ
LA4485 Power Amlifier

2 x 5 Watt in two-channel mode
15 Watt in BTL mode (Bridge)
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13

Name
CH1 IN
CH2 IN
SS GND
BTL IN
BTL OUT
FILTER
LS Vcc
SS Vcc
STADBY
MUTE
CH2 OUT
LS GND
CH! OUT

Description
Channel 1 input
Channel 2 input
Small-signal ground
BTL-mode feedback input
BTL-mode feedback output
Filter capacitor connection
Large-signal supply
Small-signal supply
Stanby control input
Mute control input
Channel 2 output
Large-signal ground
Channel 1 out

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SYNTEZA
PLL2002A Serial Input PLL Frequency
Synthesizer

The PLL2002A is a serial data programmable PLL Frequency Syntheseizer. Ratios of reference frequency divider and
input frequency divider can be independently set.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

Name
RI
RO
NC
Vcc
PD
GND
LD
Fin
CL
Data
EN
DOA
NC
Test
OV
OR

Description
Reference X-tal Oscillator Input
Reference X-tal Oscillator Output
No Connection
Positive Supply Voltage - 5 Volt
Phase Detector Output - VCO Voltage Out
Ground
Loop Detector - Loop Detected=HIGH - Not Detected=LOW
VCO Frequency In
Clock from CPU
Data from CPU
Enable from CPU
Charge pump output for activ lowpass filter
No Connection
Connect to Vcc
Phase detector output to differential lowpass filter
Phase detector output to differential lowpass filter

Serial Data for PLL2002A

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Serial data input timing

Divider data setting procedure

Input data must be MSB first. Final bit (17th bit) is assigned to the control bit.
Data are written into shift register at the rising edge of the CLK signal.
When LE is HIGH, data is transferred from the shift register to either the latch of reference divider or input divider.
Thus data must be written on the shift register while LE is remaining L0W.
While all bits of the N latch to are " 0 " , the N counter will be disabled, DOA, DOP are floating, and the supply current
will be decreased.
While all bits of the R latch are " 0 " , oscillator will be disabled.
While all bits of R and N latches are " 0 " , supply current decreases to 10uA or less.

PROCESOR
HD404829FS
Hitachi MCU

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Pins marked with bold is alternativ function for the MCU.
Pin
1
2
3
4
5
6
7
8
9

I/O

I
I
I
I
I
I

10 I
11 O
12 I
I
13
14
15
16
17
18
19
20
21
22
23
24
25
26
26

Symbol
NUMO
NUMG
AVcc
AN0
AN1
AN2
AN3
AVss
TEST
OSC 1
OSC 2
RESET
X1

O

X2

I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I

GND
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
STOPC

27 I
27 I
I/O
28

D11
INT0
R0-0

28
29
29
30
30
31
31
32
32
33

INT1
R0-1
INT2
R0-2
INT3
R0-3
INT4
R1-0
TOB
R1-1

I
I/O
I
I/O
I
I/O
I
I/O
O
I/O

Function
President George
Non-user pin. Do not connect it to any lines
Not connected
Non-user pin. Connect it to GND
Not connected
Power pin for A/D converter
+ 5 Volt
Analog input pin for A/D converter
Not connected
Analog input pin for A/D converter
Meter level input (RF/SWR/S/MOD)
Analog input pin for A/D converter
Channel UP/DOWN from Mic.
Analog input pin for A/D converter
Not connected
Ground pin for A/D converter
0 Volt
Used for factory testing only. Connect this pin to
Vcc
Input pin for the internal oscillator circuit
Output pin for the internal oscillator circuit
Reset the MCU
Used for a 32.768 kHz crystal for clock
Not connected
purposes
Used for a 32.768 kHz crystal for clock
Not connected
purposes
Connected to ground
0 Volt
Input/output pin adressed by individual bits.
TX/RX switch in
Input/output pin adressed by individual bits.
Not connected
Input/output pin adressed by individual bits.
Not connected
Input/output pin adressed by individual bits.
Not connected
Input/output pin adressed by individual bits.
Not connected
Input/output pin adressed by individual bits.
Not connected
Input/output pin adressed by individual bits.
Keyboard strobe input
Input/output pin adressed by individual bits.
Keyboard strobe input
Input/output pin adressed by individual bits.
Keyboard strobe input
Input/output pin adressed by individual bits.
Keyboard strobe input
Input pin adressed by individual bits.
Mode SW: 1=Defalt 0=CEPT
Input pin for transition from stop mode to active
mode
Input pin adressed by individual bits.
Stop
Input pin for external interrupts
Input/output pin adressable by individual bits
Mode select: 0=Defalt 1=Allways
Internationell
Input pin for external interrupts
Input/output pin adressable by individual bits
Channel UP from rotary knob
Input pin for external interrupts
Input/output pin adressable by individual bits
Channel DOWN from rotary knob
Input pin for external interrupts
Input/output pin adressable by individual bits
Input pin for external interrupts
Input/output pin adressable by individual bits
BEEP output
Timer output pin
Input/output pin adressable by individual bits
GREEN lamp

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33
34
34
35
35
36
36
37
37
38
38
39
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74

O
I/O
O
I/O
I
I/O
I
I/O
I/O
I/O
I
I/O
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O

TOC
R1-2
TOD
R1-3
EVNB
R2-0
EVND
R2-1
SCK
R2-2
SI
R2-3
SO
R3-0
R3-1
R3-2
R3-3
R4-0
R4-1
R4-2
R4-3
R5-0
R5-1
R5-2
R5-3
R6-0
R6-1
R6-2
R6-3
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG

Timer output pin
Input/output pin adressable by individual bits
Timer output pin
Input/output pin adressable by individual bits
Event count input pin
Input/output pin adressable by individual bits
Event count input pin
Input/output pin adressable by individual bits
Serial interface clock input/output pin
Input/output pin adressable by individual bits
Serial interface receive data input pin
Input/output pin adressable by individual bits
Serial interface transmit data output pin
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Input/output pin adressable by individual bits
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD

ORANGE lamp
Not connected
Not connected
Serial data output to EEPROM
Serial data input from EEPROM
Chip select to EEPROM
Clock to EEPROM

Keyboard strobe output
Keyboard strobe output
Keyboard strobe output
Keyboard strobe output
Not connected
Not connected
Clock to PLL
Data to PLL
Chip select to PLL
TX/RX output to analogboard
Sqelsch input
POWER switch (ON/OFF)
High/Low power output
Not connected
Not connected
Not connected
Not connected
Seg. 1
Seg. 2
Seg. 3
Seg. 4
Seg. 5
Seg. 6
Seg. 7
Seg. 8
Seg. 9
Seg. 10
Seg. 11
Seg. 12
Seg. 13
Seg. 14
Seg. 15
Seg. 16

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75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O

SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
SEG
COM1
COM2
COM3
COM4
V1
V2
V3
Vcc
NUMO

Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Segment signal pin for LCD
Common signal pin for LCD
Common signal pin for LCD
Common signal pin for LCD
Common signal pin for LCD
Power pin for LCD driver.
Power pin for LCD driver.
Power pin for LCD driver.
Applies power voltage
Non-user pin. Do not connect it to any lines

Seg. 17
Seg. 18
Seg. 19
Seg. 20
Seg. 21
Seg. 22
Seg. 23
Seg. 24
Seg. 25
Seg. 26
Seg. 27
Seg. 28
Seg. 29
Seg. 30
Seg. 31
Seg. 32
Seg. 33
Com.1
Com. 2
Com. 3
Not connected
Not connected
Not connected
+ 5 Volt
Not connected

PLL CARIER OSC. - STROJENIE
President George CB-Radio
ALIGNMENT PROCEDURE
PLL CARIER OSCILLATOR PORTION
Test equipment required:
Power Supply: 13,2 V
Preparation alignment:

DC Volt Meter

Oscilloscope

Frequency Counter

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Clarifier
RF Power
VR205 and VR206
Remove
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

Condition
RX AM
27.405 MHz
RX AM
26.965 MHz
TX AM
27.205 MHz
RX AM
27.205 MHz
TX FM
27.205 MHz
RX FM
27.205 MHz
TX USB
27.205 MHz
RX USB
27.205 MHz
TX LSB
27.205 MHz
RX LSB
27.205 MHz
TX AM
27.205 MHz
TX FM
27.205 MHz
TX USB
27.205 MHz
RX USB
27.205 MHz
TX LSB
27.205 MHz
RX LSB
27.205 MHz
RX FM
28.755 MHz
RX USB
26.065 MHz

Center
Clockwise
Center
PB 201
Adjustment
L405

L401
Check
Check
Check
VR211
Check
L402
Check
L406
Check
L408
Check
L402
Check
Check
Check

Procedure
Connect the DC Voltmeter to TP2
Adjust for 2.5 +/- 0.1 V
Same as Step 1
More than 2.0 V
Connect oscilloscope to TP1
Adjust for 37.900 MHz +/- 20 Hz
Same as Step 3
37.900 MHz +/- 20 Hz
Same as Step 3
37.900 MHz +/- 20 Hz Reading
Same as Step 3
37.900 MHz +/- 20 Hz Reading
Connect oscilloscope to TP1
Adjust for 37.9025 MHz +/- 20 Hz
Same as Step 3
37.9025 MHz +/- 20 Hz
Connect oscilloscope to TP1
Adjust for 37.8975 MHz +/- 20 Hz
Same as Step 3
37.8975 MHz +/- 20 Hz
Connect oscilloscope to TP 3
Adjust for10.695 MHz +/- 20 Hz
Same as Step 11
10.695 MHz +/- 20 Hz Reading
Connect oscilloscope to TP 3
Adjust for10.6975 MHz +/- 20 Hz
Same as Step 13
10.6975 MHz +/- 20 Hz Reading
Connect oscilloscope to TP 3
Adjust for10.6925 MHz +/- 20 Hz
Same as Step 15
10.6925 MHz +/- 20 Hz Reading
Same as Step 1
Less than 4.2 V
Same as Step 1
More than 1.2 V

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Oscillator-frequency at 27.205MHz
VFO OSC- TP1

Adjust

X-tal OSC - TP3

Adjust

Mod.

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37.9000MHz
37.9000MHz
37.9025MHz
37.8975MHz
37.9000MHz
37.9000MHz
37.9025MHz
37.8975MHz

L401

L402

VR211

10.6950MHz
10.6950MHz
10.6975MHz
10.6925MHz
10.6950MHz
10.6950MHz
10.6975MHz
10.6925MHz

L408
L407
L406

RX - AM
RX - FM
RX - USB
RX - LSB
TX - AM
TX - FM
TX - USB
TX - LSB

STROJENIE NADAJNIKA
President George CB-Radio
ALIGNMENT PROCEDURE
TRANSMITTER PORTION
Test equipment required:
Power Supply: 13,2 V
RF VTVM
AF VTVM

DC Current Meter
AF Oscillator

Oscilloscope
FM Linear Detector

RF Power meter
Dummy Load (50 ohm)

Preparation alignment:
VR208
VR205 and VR 206
VR207, VR201, VR202, and VR 203
Mic gain
Meter SW
SWR/CAL Volume
RF Power
Test frequency
Step
1
2
3

Condition
LSB 27.185 MHz
No Mod.
Same as Step 1
Same as Step 1

Clockwise
Middle position
Counterclockwise
Clockwise
RF
Middle position
Clockwise
27.185 MHz

Adjustment
Procedure
VR203
Remove the PB201
Connect a DC current meter to TP202 (+) and TP203 (-)
Adjust for 330 mA
VR201
Connect a DC current meter to TP202 (+) and TP201 (-)
Adjust for 85 mA
VR202
Connect a DC current meter to TP202 (+) and TP201 (-)
Adjust for 170 mA

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4

5

6
7
8
9
10
11
12

LSB 27.185 MHz
Two-Tone
400 Hz and 2.500
Hz
1 mV Mod.
LSB 27.185 MHz
Two-Tone
400 Hz and 2.500
Hz
30 mV Mod.
SSB 27.185 MHz
No Mod.
AM 27.185 MHz
No Mod.
AM 27.185 MHz
No Mod.
AM 27.185 MHz
1 kHz 30 mV Mod.
AM 27.185 MHz
1 kHz 3 mV Mod.
FM 27.185 MHz
No Mod.
FM 27.185 MHz
1 kHz 30 mV Mod.

L221

Re-install the PB201
Adjust for maximum on the RF VTVM
Set the AF-oscillator, so that the output is less than 32 V

VR208

Adjust for 25 V on the RF VTVM

VR209
VR205

Adjust the carrier leakade at LSB and USB become minimum and
almost equal
Adjust for 3.9 Watt on the WattMeter

VR204

Adjust for RF Meter at " 9 " just light on

VR207

Adjust 90% negative

VR213

Adjust for Modulation Meter at " 9 " just light on

VR206

Adjust for 3,9 Watt on the WattMeter

VR212

Adjust for +/- 1.9 kHz Deviation

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STROJENIE ODBIORNIKA
President George CB-Radio
ALIGNMENT PROCEDURE
RECEIVER PORTION
Test equipment required:
Power Supply: 13,2 V
AM/FM SSG

SINAD Meter
(AM: 1 kHz 60% Mod.)

Oscilloscope
(FM: 1 kHz 1.2 kHz Deviation)

Preparation alignment:
NB/ANL
HI CUT
SQUELCH
Volume
RF Gain
Clarifier
Frequency
Step
1
2
3
4
5
6
7
8
9

10

Condition
AM
60% Mod.
FM
1.2 kHz Dev.
AM
No Mod.
AM
No Mod.
USB
No Mod.
USB
No Mod.
USB
No Mod.
USB
No Mod.
AM
26.065 MHz
60% Mod.
AM
28.755 MHz
60% Mod.

Off
Off
Counter clockwise
Clockwise
Clockwise
Center
27.185 MHz
Adjustment
L17 L2 L6 L7 L11 L12
L13
L16

Procedure
Adjust for maximum reading on the AF VTVM

VR4

SSG: 40dB (50uV) Adjust " 9 " just light on

VR2

SSG: 66dB (1mV) Just apper AF level

L15 and L14

Adjust for maximum reading on the AF VTVM

VR3

SSG: 40dB (50uV) Adjust " 9 " just light on

VR1

SSG: 66dB (1 mV) Just apper AF level

L1

Connect Oscilloscope to TP4. Set Oscilloscope to DC range and
adjust to reach max. reading.
SSG: 10dB
More than 20 dB SINAD

Check

Check

Adjust for maximum reading on the AF VTVM

SSG: 10dB
More than 20 dB SINAD

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Improved receive gain
Quieting of AM reception and improving gain of incoming signals is a common request from radio
operators. In the first stages of the HF input 2SC1674 (Q8) transistor can be found. This transistor is
responsible for the amplification of a small detected signals. A problems exist if the transistor itself is
noisy as is such the case of the 2SC1674 when compared to other low noise packages. Along with the
amplification of the incoming signals is transistor noise. Replacement of this transistor with a higher
gain, lower noise transistor greatly improves the signal to noise ratio of your receiver.
The transistor Q8 operates at VC = 6Volt and IE 2,5mA. We will use an 2SC2999 transistor that has
E
=
higher gain and lower noise characteristic. Replace 2SC1674 (Q8) with 2SC2999 (or similar low noise
and high gain transistor) to achieve this improved signal to noise ratio.
Re-adjust L2.
The gain will improved with more than 6dB with the same signal to noise ratio.

Schemat blokowy
President Georgie

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ANALOG. SCHEMAT P?YTY G?ÓWNEJ

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ANALOG. SCHEMAT P?YTY
CZO?OWEJ

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ANALOG. SCHEMAT ECHA

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ROZMIESZCZENIE ELEMENTÓW


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