Yaesu FT-450 Manual

Introduction
This manual provides technical information necessary
for servicing the FT-450 HF/50 MHz Transceiver.
Servicing this equipment requires expertise in handling
surface-mount chip components. Attempts by non-qual-
ified persons to service this equipment may result in per-
manent damage not covered by the warranty, and may
be illegal in some countries.
Two PCB layout diagrams are provided for each double-
sided circuit board in the Transceiver. Each side of is re-
ferred to by the type of the majority of components in-
stalled on that side (“leaded” or “chip-only”). In most
cases one side has only chip components, and the other
has either a mixture of both chip and leaded components
(trimmers, coils, electrolytic capacitors, ICs, etc.), or lead-
ed components only.
While we believe the technical information in this manu-
al to be correct, VERTEX STANDARD assumes no liabili-
ty for damage that may occur as a result of typographi-
cal or other errors that may be present. Your cooperation
in pointing out any inconsistencies in the technical infor-
mation would be appreciated.
©2007 VERTEX STANDARD CO., LTD.
Technical Supplement
HF/50 MHz TRANSCEIVER
FT-450
Contents
Specifications
Exploded View & Miscellaneous Parts
Block Diagram
Connection Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
RF-IF Unit
PANEL Unit
CNTL Unit
PA Unit
TUNER Unit ATU-450 (Option)
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
VERTEX STANDARD (AUSTRALIA)PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia
EH024H90A

Specifications
SPECIFICATIONS-1
General
Rx Frequency Range: 30 kHz - 56 MHz (operating)
160 - 6 m (specified performance, Amateur bands only)
Tx Frequency Ranges: 160 - 6 m (Amateur bands only)
Frequency Stability: ±1 ppm/hour (@+25 °C, after warmup)
Operating Temperature Range: –10 °C ~ +50 °C
Emission Modes: A1A (CW), A3E (AM), J3E (LSB, USB), F3E (FM), F2D (DTMF TONE)
Frequency Steps: 10 Hz (SSB & CW), 100 Hz (AM & FM)
Antenna Impedance: 50 Ohms, unbalanced
Power Consumption: Rx (signal present) 1.5 A
Tx (100 W) 22 A
Supply Voltage: DC 13.8 V ± 10%
Dimensions (WxHxD): 9” x 3.3” x 8.5” (229 x 84 x 217 mm)
Weight (approx.): 7.9 lb (3.6 kg)
Transmitter
Power Output: 100 watts (25 watts AM carrier)
Modulation Types: J3E (SSB): Balanced,
A3E (AM): Low-Level (Early Stage),
F3E (FM): Variable Reactance
Maximum FM Deviation: ±5.0 kHz / ±2.5 kHz
Harmonic Radiation: Better than –60 dB (160 - 10m Amateur bands)
Better than –70 dB (6m Amateur band)
SSB Carrier Suppression: At least 60 dB below peak output
Undesired Sideband Suppression: At least 60 dB below peak output
Audio Response (SSB): Not more than –6 dB from 400 to 2600 Hz
3rd-order IMD: –31 dB @14 MHz 100 watts PEP
Microphone Impedance: 600 Ohms (200 to 10 kOhms)

Specifications
SPECIFICATIONS-2
Receiver
Circuit Type: Double-conversion superheterodyne
Intermediate Frequencies: 67.899 MHz / 24 kHz
Sensitivity (IPO “OFF”, ATT: OFF): SSB (2.4 kHz, 10 dB S+N/N)
0.25 µV (1.8 - 2.0 MHz)
0.25 µV (3.5 - 30 MHz)
0.20 µV (50 - 54 MHz)
AM (6 kHz, 10 dB S+N/N, 30 % modulation @400 Hz)
2.00 µV (1.8 - 2.0 MHz)
2.00 µV (3.5 - 30 MHz)
1.00 µV (50 - 54 MHz)
FM (BW: 15 kHz, 12 dB SINAD)
0.50 µV (28 - 30 MHz)
0.30 µV (50 - 54 MHz)
There is no specification in frequency ranges not listed.
Squelch Sensitivity: SSB/CW/AM
(IPO “OFF”, ATT: OFF) 2.50 µV (1.8 - 30 MHz)
1.00 µV (50 - 54 MHz)
FM
0.32 µV (28 - 30 MHz)
0.16 µV (50 - 54 MHz)
There is no specification in frequency ranges not listed.
Selectivity (–6/–60 dB): Mode –6 dB –60 dB
CW 0.5 kHz or better 2.0 Hz or less
SSB 2.2 kHz or better 4.5 kHz or less
AM 6 kHz or better 20 kHz or less
FM 15 kHz or better 30 kHz or less
FM-N 9 kHz or better 25 kHz or less
Image Rejection: 80 dB or better (160 - 10m Amateur bands)
65 dB or better (6m Amateur band)
Maximum Audio Output: SSB/CW 1.5 W into 8 Ohms with 10% THD
AM/FM 0.6 W into 8 Ohms with 10% THD
Audio Output Impedance: 4 to 16 Ohms (8 Ohms: nominal)
Conducted Radiation: Less than 4000 µµW
Specifications are subject to change, in the interest of technical improvement, without notice or obligation, and are guaranteed only within the
amateur bands.

Specifications
Note
SPECIFICATIONS-3

Exploded View & Miscellaneous Parts
Exploded View-1
FT-450 Technical Supplement
PANEL Unit
P1091172
RF CONNECTOR
M4090066
SPEAKER
RA0898200
TOP CASE
RA0898500
BOTTOM CASE
S4000043 (X4 pcs)
CASE LEG
RA0898600
SP HOLDER
RA0898900
FAN COVER
PA Unit
RA089920A
PANEL ASSY
RA089840A
SP NET
RA0898000
CHASSIS
Q9000709A
ROTARY ENCODER
RA0900100
KNOB MAIN ASSY
RA0900400
RUBBER RING
RA0924900
SPONGE (SP)
RA0900800
KNOB
RA0900800
KNOB
RA0900800
KNOB
RA0900700
KNOB
R0136380
COIL SPRING
RA090090A
RUBBER KNOB
RA090100A
RUBBER KNOB
RA0925700 (X2 pcs)
SPONGE (CHASSIS)
RF-IF Unit
ANT TUNER ASSY
RA0898800
SHIELD COVER (CTRL)
RA089870A
RUBBER PACKING
PANEL Unit
CNTL Unit
RA0951800 (X 2pcs)
PAD
R6144801
NUT
R3135000A
WASHER
RA0901700
SHIELD PLATE
RA0901800
SPONGE RUBBER
RA0901500
SHIELD CASE ASSY
RA0951800
PAD
TUNER Unit
RA094710A
SHEET
RA0899500
LCD HOLDER
RA089960A
SPONGE (LCD)
RA089970A
LIGHT GUIDE
RA0900000
INTER CONNECTOR
RA089980C
REFLECTOR SHEET
RA0931100 (X2 pcs)
LIGHT SHEET
RA0900000
INTER CONNECTOR
No. VXSTD P/N Decription Qty.
U31306007 OVAL HEAD SCREW M3X6B 20
U20420007 BINDING HEAD SCREW M4X20B 4
U24306002 BIND HEAD TAPTITE-B M3X6NI 20
U03310002 SEMS SCREW ASM3X10NI 9
U04410002 SEMS SCREW HSM4X10NI 1
U24108002 BIND HEAD TAPTITE-B M2X8NI 9
U20306002 BINDING HEAD SCREW M3X6NI 5
U30305002 FLAT HEAD SCREW M3X5NI 7
M2090048
FAN
U91408007
HEX SOCKET SCREW
LCD
RA0940000 (X4 pcs)
TAPE
S6000427
CLAMP
T9318299
WIRE ASSY (GRN 250 TMP/TMP)
T9318300
WIRE ASSY(GRA 320 TMP/TMP)
T9207410
WIRE ASSY
T9318049
WIRE ASSY (GRN 500 TMP/TMP)
T9318244A
WIRE ASSY (GRA 250 TMP/TMP)
T9207114A
WIRE ASSY
T9207114A
WIRE ASSY
T9207114A
WIRE ASSY
T9207120A
WIRE ASSY
T9207398A
WIRE ASSY
T9207202A
WIRE ASSY
VXSTD P/N Decription Qty.
Q0000074 BLADE FUSE 25A 1
M3090122A MICROPHONE MH-67A8J W/CLIP 1
T9023725 DC CABLE 04P 25AX2 3000MM 1
TUNER Unit ATU-450 (Option)

Exploded View-2
Exploded View & Miscellaneous Parts
FT-450 Technical Supplement
Note

BLOCK DIAGRAM-1FT-450 Technical Supplement
Block Diagram

CONNECTION DIAGRAM-1 FT-450 Technical Supplement
Connection Diagram

ALIGNMENT-1
Alignment
Introduction and Precautions
The following procedures cover adjustments that are
not normally required once the transceiver has left
the factory. However, if a problem occurs during
normal operation due to component failure; realign-
ment may be required after the faulty components
have been replaced.
We recommend that authorized Vertex Standard
Technicians, who are experienced with the circuitry
and fully equipped to repair and align our products,
perform repairs. If a fault is suspected, contact the
selling dealer for instructions regarding repair. Au-
thorized Vertex Standard Technicians have the lat-
est information to align all circuits and make com-
plete performance checks to ensure compliance with
factory specifications after repairs.
Those who undertake the following alignments are
cautioned to proceed at their own risk. Problems
caused by unauthorized attempts at realignment are
not covered by the warranty policy.
Vertex Standard must reserve the right to change
circuits and alignment procedures in the interest of
improved performance, without notifying owners.
Under no circumstances should any alignment be
attempted unless the normal functions and opera-
tion of the transceiver are clearly understood, the
cause of the malfunction has been clearly identified
and all faulty components replaced. The need for
realignment should be determined to be necessary.
The following test equipment (and a thorough fa-
miliarity with its correct use) is necessary for correct
alignment. Most steps do not require all of the equip-
ment listed. The interactions of some adjustments
may require that several adjustments be performed
in a sequence. Do not attempt to perform only a sin-
gle step unless it is clearly isolated electrically from
all other steps. Have all test equipment ready before
beginning, and follow all of the steps in a section in
the order they are presented.
Required Test Equipment
RF Signal Generator
AF Signal Generator
Spectrum Analyzer good to at least 1 GHz.
Frequency Counter
SINAD Meter
RF Millivoltmeter
Digital DC Voltmeter (high-Z, 1 M-Ohm/V)
DC Voltmeter
DC Ammeter (20 A)
Ohmmeter
50-Ohm Dummy Load (100 watts)
16.6-Ohm Dummy Load (100 watts)
In-Line Wattmeter (100 watts, 50-Ohm)
Linear Detector
RF Coupler
4-Ohm AF Dummy Load (3 watts)
Alignment Preparation & Precautions
A 50-ohm RF Dummy load and in-line wattmeter
must be connected to the "ANT" jack in all proce-
dures that call for transmission, except where speci-
fied otherwise. Correct alignment is not possible with
an antenna.
After completing one step, read the following step
to determine whether the same test equipment will
be required. If not, remove the unneeded test equip-
ment before proceeding (except the dummy load and
wattmeter).
Correct alignment requires that the ambient temper-
ature be maintained constant between 68 °F ~ 86 °F
(20 °C ~ 30 °C). When the transceiver is brought into
the shop from a hot or cold environment, it should
be allowed time to come to room temperature be-
fore alignment. Also, the test equipment must be
thoroughly warmed up before beginning.
Whenever possible, alignments should be made with
oscillator shields and circuit boards firmly affixed in
place.
Note: Signal levels in dB referred to in this proce-
dure are based on 0 dBµ = 0.5 µV (closed cir-
cuit).

ALIGNMENT-2
Alignment
Reference Frequency
Connect the Frequency Counter to TP2001 on the
RF-IF-Unit.
Adjust X2001 so that the Frequency Counter read-
ing is 22.625 MHz ±10 Hz.
2nd Local Carrier Output Level
Connect the RF millivoltmeter to TP2009 on the
RF-IF-Unit.
Adjust T2017 on the RF-IF-Unit for maximum
deflection on the RF millivoltmeter (more than
25 mVrms).
PLL VCV Voltage
Connect the Digital DC voltmeter (high-Z) to
TP2006 on the RF-IF-Unit.
Set the [MODE] switch to FM.
Referring to the table below, adjust the listed com-
ponents for the required voltage, or confirm that
the correct voltage is present on each frequency
listed.
RX IF Circuit (SSB/CW)
Set the following controls as indicated:
[IPO]: OFF
[ATT]: OFF
[RF GAIN] knob: Fully clockwise
Connect the AF millivoltmeter and 4 Ohm
dummy load to the EXT SPKR jack.
Connect the RF Signal Generator to the "ANT"
jack, and then set the output level to 0 dBµV at
the 51.995 MHz.
Set the transceiver to 51.995 MHz in the CW
mode.
Adjust T2020 on the RF-IF-Unit for maximum
deflection on the AF millivoltmeter.
RX IF Circuit (FM)
Set the following controls as indicated:
[IPO]: OFF
[ATT]: OFF
[RF GAIN] knob: Fully clockwise
Connect the SINAD meter and 4-Ohm dummy
load to the EXT SPKR jack.
Connect the RF Signal Generator to the "ANT"
jack, and then set the RF Signal Generator to
51.995 MHz at the level of 0 dBµV, ± 3.0 kHz de-
viation with a 1 kHz audio tone.
Set the transceiver to 51.995 MHz in the FM mode.
Adjust T2021 and T2022 on the RF-IF-Unit for
maximum deflection on the SINAD meter.
VFO-A FREQUENCY
13.499 MHz
0.030 MHz
29.999 MHz
13.500 MHz
44.499 MHz
30.000 MHz
55.999 MHz
44.500 MHz
ADJUST / CONFIRM
Adjust L2065
Confirm
Adjust L2066
Confirm
Adjust L2067
Confirm
Adjust L2068
Confirm
DC VOLTMETER
5.2 V ± 0.1 V
At least 0.5 V
5.2 V ± 0.1 V
At least 0.5 V
5.2 V ± 0.1 V
At least 0.7 V
5.2 V ± 0.1 V
At least 0.7 V
TX IF Circuit (SSB/CW)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Disconnect the TMP plug from J2002 on the RF-
IF-Unit, and then connect the RF millivoltmeter
and 50 Ohm dummy load to J2002.
Inject the 1 mV, 1 kHz audio signal to pin 5 of
MIC jack.
Set the transceiver to 7.000 MHz, USB mode.
Press the PTT button; adjust T2018, T2019, T2021,
and T2022 on the RF-IF-Unit for maximum de-
flection on the RF millivoltmeter.
Disconnect the RF millivoltmeter and 50 Ohm
dummy load from J2002 on the RF-IF-Unit, then
re-connect the TMP plug to J2002.

ALIGNMENT-3
Alignment
TP2006
TP2001TP2009 T2017
X2001 T2019
T2018
T2022
T2021
J2002
T2020
L2066
L2065
L2067
L2068
RF-IF UNIT ALIGNMENT POINTS

ALIGNMENT-4
Alignment
PA Unit
Preparation
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Cut the lead of L5008 on the PA Unit.
Set VR5401, VR5402, VR5403, and VR5404 on the
PA Unit to fully counter clockwise position.
Set the transceiver to 14.150 MHz in the USB
mode.
Pre-Drive Stage Idling Current
Disconnect the jumper plug from J5003 on the
PA Unit, and then connect the DC ammeter to
J5003.
Press the PTT button; adjust VR5401 on the PA
Unit so the DC ammeter reading is 100 mA ± 10
mA.
Release the PTT button.
Drive Stage Idling Current
Disconnect the jumper plug from J5004 on the
PA Unit, and then connect the DC ammeter to
J5004.
Press the PTT button; adjust VR5402 on the PA
Unit so that the DC ammeter reading is 0.5 A ± 50
mA.
Release the PTT button.
Press the PTT button; adjust VR5403 on the PA
Unit so the DC ammeter reading is 1.0 A ± 50 mA.
Release the PTT button.
Final Stage Idling Current
Connect the DC ammeter to the lead of L5008.
Press the PTT button; adjust VR5404 on the PA
Unit so the DC ammeter reading is 1.0 A ± 100
mA.
Release the PTT button.
Press the PTT button; adjust VR5405 on the PA
Unit so the DC ammeter reading is 2.0 A ± 100
mA.
Release the PTT button.
Concluding
Re-connect the jumper plugs to J5003 and J5004,
and then solder the lead of L5008.
CM Coupler Balance
Connect the DC voltmeter between TP5430 (+
lead) on the PA Unit and Chassis (- lead).
Set the transceiver to 29.200 MHz in the CW
mode.
Press the PTT switch; adjust TC5400 on the PA
Unit for minimum deflection on the DC voltme-
ter (less than 0.1 V).
Release the PTT switch.

ALIGNMENT-5
Alignment
TC5400
VR5403
L5008
VR5401
VR5402VR5404 VR5405
J5004
J5003
TP5430
PA UNIT ALIGNMENT POINTS

ALIGNMENT-6
Alignment
Software Adjustment
Preparation
Set the VFO frequency for each band as indicated:
Set the following controls as indicated:
[IPO] button: OFF
[ATT] button: OFF
[AGC] button: AUTO
[SHIFT] knob: 12-o'clock position
[AF GAIN] knob: 12-o'clock position
[RF GAIN] knob: Fully clockwise
MODE: CW
CONTOUR: OFF
NOTCH: OFF
DNR: OFF
S-meter Adjustment
Connect the RF Signal Generator to the "ANT"
jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
then set the RF Signal Generator output to each
level, and adjust the [MAIN DIAL] knob for the
corresponding S-meter deflection.
ALC Adjustment
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "I-ALC1".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 140 W ± 10 W on the Wattmeter. Note
the alignment value which is displayed on the
frequency display area of the LCD.
Release the PTT switch.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "I-ALC2".
Press the PTT switch, then rotate the [MAIN DIAL]
for 110 W ± 5 W on the Wattmeter.
Release the PTT switch.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "I-ALC3".
Rotate the [MAIN DIAL] knob to set an alignment
value to same value, which was noted in the pre-
vious step ("I_ALC1").
Press and hold in the [F] button for 2 seconds to
save the new setting and exit from the alignment
mode.
Power Adjustment (100 W)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
and adjust the [MAIN DIAL] knob for the corre-
sponding Wattmeter deflection while pressing
the PTT switch.
OPERATING BAND
General Band
1.8 MHz Band
3.5 MHz Band
7 MHz Band
14 MHz Band
21 MHz Band
28 MHz Band
50 MHz Band
FREQUENCY
1.200 MHz
1.900 MHz
3.750 MHz
7.150 MHz
14.175 MHz
21.255 MHz
28.850 MHz
52.000 MHz
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
S-METER
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
S-1 (3 dots)
ALIGNMENT PARAMETER
SMADJ0
SMADJ1
SMADJ2
SMADJ3
SMADJ4
SMADJ5
SMADJ6
SMADJ
RF SIGNAL GENERATOR
1.200 MHz, 32 dBµ
1.900 MHz, 12 dBµ
3.750 MHz, 12 dBµ
7.150 MHz, 12 dBµ
14.175 MHz, 12 dBµ
21.255 MHz, 12 dBµ
28.850 MHz, 12 dBµ
52.000 MHz, 12 dBµ ALIGNMENT PARAMETER
1PO100
2PO100
3PO100
4PO100
5PO100
6PO100
7PO100
WATTMETER
100 W ±2 W
100 W ±2 W
100 W ±2 W
100 W ±2 W
100 W ±2 W
90 W ±2 W
100 W ±2 W
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.

ALIGNMENT-7
Alignment
Power Adjustment (50 W)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
and adjust the [MAIN DIAL] knob for the corre-
sponding Wattmeter deflection while pressing
the PTT switch.
Power Adjustment (10 W)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
and adjust the [MAIN DIAL] knob for the corre-
sponding Wattmeter deflection while pressing
the PTT switch.
ALIGNMENT PARAMETER
1PO 50
2PO 50
3PO 50
4PO 50
5PO 50
6PO 50
7PO 50
WATTMETER
50 W ±2 W
50 W ±2 W
50 W ±2 W
50 W ±2 W
50 W ±2 W
50 W ±2 W
50 W ±2 W
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
Power Adjustment (20 W)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
and adjust the [MAIN DIAL] knob for the corre-
sponding Wattmeter deflection while pressing
the PTT switch.
ALIGNMENT PARAMETER
1PO 20
2PO 20
3PO 20
4PO 20
5PO 20
6PO 20
7PO 20
WATTMETER
20 W ±2 W
20 W ±2 W
20 W ±2 W
20 W ±2 W
20 W ±2 W
20 W ±2 W
20 W ±2 W
ALIGNMENT PARAMETER
1PO 10
2PO 10
3PO 10
4PO 10
5PO 10
6PO 10
7PO 10
WATTMETER
10 W ±1 W
10 W ±1 W
10 W ±1 W
10 W ±1 W
10 W ±1 W
10 W ±1 W
10 W ±1 W
ALIGNMENT PARAMETER
1PO 5
2PO 5
3PO 5
4PO 5
5PO 5
6PO 5
7PO 5
WATTMETER
5 W ±1 W
5 W ±1 W
5 W ±1 W
5 W ±1 W
5 W ±1 W
5 W ±1 W
5 W ±1 W
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
Power Adjustment (5 W)
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Select the appropriate "Alignment Parameter"
using the [DSP/SEL] knob per the chart below,
and adjust the [MAIN DIAL] knob for the corre-
sponding Wattmeter deflection while pressing
the PTT switch.
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.

ALIGNMENT-8
Alignment
TX Gain Adjustment
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Connect the Audio Generator to pin 5 of the MIC
jack (pin 7: GND), then set the output level to 1
mV @1 kHz.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
ALC Meter Adjustment
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "ALCM L".
Press the PTT switch, then press the [STO] but-
ton.
Connect the Audio Generator to pin 5 of the MIC
jack (pin 7: GND), then set the output level to 4
mV @1 kHz.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "ALCM H".
Press the PTT switch, then press the [STO] but-
ton.
Press and hold in the [F] button for 2 seconds to
save the new setting and exit from the alignment
mode.
Reverse ALC Adjustment
Connect the 16.6-Ohm Dummy Load (parallel
connections of the three 50-Ohm Dummy Loads)
to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "1-RALC".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 50 W on the PO meter of the FT-450.
Release the PTT switch.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "2-RALC".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 50 W on the PO meter of the FT-450.
Release the PTT switch.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "3-RALC".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 50 W on the PO meter of the FT-450.
Release the PTT switch.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "50RALC".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 50 W on the PO meter of the FT-450.
Release the PTT switch.
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.
AM Carrier Level Adjustment
Connect the 50-Ohm Dummy Load and Wattme-
ter to the "ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Set the [MODE] switch to "AM".
Rotate the [DSP/SEL] knob to select the align-
ment parameter "AM-CAR".
Press the PTT switch, then rotate the [MAIN DIAL]
knob for 25 W±2 W on the Wattmeter.
Release the PTT switch.
Press and hold in the [F] button for 2 seconds to
save the new setting and exit from the alignment
mode.
ALIGNMENT PARAMETER
TXG1H
TXG2H
TXG3H
TXG4H
TXG5H
TXG6H
TXG7H
TXG1L
TXG2L
TXG3L
TXG4L
TXG5L
TXG6L
TXG7L
WATTMETER
50 W ±10 W
50 W ±10 W
50 W ±10 W
50 W ±10 W
50 W ±10 W
50 W ±10 W
50 W ±10 W
10 W ±2 W
10 W ±2 W
10 W ±2 W
10 W ±2 W
10 W ±2 W
10 W ±2 W
10 W ±2 W

ALIGNMENT-9
Alignment
Voltmeter Adjustment
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Adjust the DC Power Supply voltage is exactly
13.8 V.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "VM-ADJ".
Press the [STO] button.
Press and hold in the [F] button for 2 seconds to
save the new setting and exit from the alignment
mode.
ATAS Controller Adjustment
Connect the Digital DC voltmeter (high-Z) to the
"ANT" jack.
Press and hold in the [ATT/IPO], [NB], and [AGC]
buttons, while turning the radio on, to enter the
alignment mode.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "ATAS DN".
Press the [STO] button, then rotate the [MAIN
DIAL] knob for 8.0 V on the DC Voltmeter.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "ATAS BK".
Press the [STO] button, then rotate the [MAIN
DIAL] knob for 9.5 V on the DC Voltmeter.
Rotate the [DSP/SEL] knob to select the align-
ment parameter "ATAS UP".
Press the [STO] button, confirm that the DC Volt-
meter reading is more than 10.5 V.
Press and hold in the [F] button for 2 seconds to
save the new settings and exit from the alignment
mode.

ALIGNMENT-10
Alignment
Note

RF-IF Unit
RF-IF-1
FT-450 Technical Supplement
Circuit Diagram

RF-IF-2
RF-IF Unit
FT-450 Technical Supplement
Note