Yaesu Musen 20241X50 Users manual
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
Introduction
The FT-450 is a rugged, innovative multiband, multimode portable transceiver for the
amateur radio HF/VHF bands. Providing coverage of the 160-10 meter bands plus the 6 m,
the FT-450 includes operation on the SSB, CW, AM, FM, and Digital modes, yielding the
most comprehensive performance package available for field operation.
Designed for use from an external DC power source, the FT-450 provides 100 watts of power
output from a 13.8-Volt external power supply.
The multi-function Liquid-Crystal Display includes various backlighting, which may be
disabled for battery conservation. The display includes bar-graph indication of power output,
ALC voltage, SWR, and modulation level.
Among the advanced features of the FT-450 are many incorporated only in large base-station
transceivers. These include Dual VFOs; Split-Frequency operation; Digital Signal Processing
(Bandpass Filtering, Noise Reduction, Notch, and Microphone Equalizer); IF Shift; Clarifier
(“R.I.T.”); IF Noise Blanker; AGC Fast/Slow/Auto/Off selection; RF Gain and Squelch control;
IPO (Intercept Point Optimization) and a receiver front-end Attenuator; VOX; Built-in
Electronic Keyer; Adjustable CW Pitch; Built-in CTCSS Encoder/Decoders; and Time-Out
Timer (TOT) functions; Computer Interface capability; and Cloning capability.
We urge you to read this manual in its entirety, so as to gain a full understanding of the
amazing capability of the exciting FT-450 Transceiver.
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
Specifications
General
Frequency Range: Receive: 30 kHz - 56 MHz
Transmit: 160 - 6 Meters
Emission Modes: A1 (CW), A3 (AM), A3J (LSB/USB), F3 (FM)
Synthesizer Steps (Min.): 10 Hz (CW/SSB), 100 Hz (AM/FM)
Antenna Impedance: 50 Ohms, Unbalanced (M)
Operating Temp. Range: -10 °C to +50 °C
Frequency Stability: ± 4 ppm from 1 min. to 60 min after power on.
@25 °C: 1 ppm/hour
Supply Voltage: Normal: 13.8 VDC ±10 %, Negative Ground
Current Consumption: Squelched: 1 A (Approx.)
Receive: 1.5 A
Transmit: 22 A
Case Size: 229 (W) x 84 (H) x 217 (D) mm
Weight (Approx.): 3.6 kg
Transmitter
RF Power Output: 100 W @13.8 V DC
Modulation Types: SSB: Balanced Modulator
AM: Early Stage (Low Level)
FM: Variable Reactance
FM Maximum Deviation: ±5 kHz (FM-N: ±2.5 kHz)
Spurious Radiation: -50 dB (1.8-29.7 MHz)
-70 dB (50 MHz)
Carrier Suppression: >40 dB
Opp. Sideband Suppression: >50 dB
SSB Frequency Response: 400 Hz-2600 Hz (-6 dB)
Microphone Impedance: 200-10k Ohms (Nominal: 600 Ohms)
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Receiver
Circuit Type: Double-Conversion Superheterodyne
st
Intermediate Frequencies: 1
2
: 67.899 MHz
nd
: 24 kHz
Operating Manual
Sensitivity:
SSB/CW AM FM
1.8 MHz-28 MHz 0.2 µV 2 µV -
28 MHz-30 MHz 0.2 µV 2 µV 0.5 µV
50 MHz-56 MHz 0.16 µV 1 µV 0.25 µV
(SSB/CW/AM = 10 dB S/N, FM = 12 dB SINAD)
Image Rejection: 70 dB
IF Rejection: 60 dB
Selectivity (-6/-60 dB): SSB/CW: 2.2 kHz/4.5 kHz
AM: 6 kHz/20 kHz
FM-N: 9 kHz/25 kHz
CW-N: 500 Hz/2.0 kHz
AF Output: 2.2 W (@4 Ohms, 10% THD or less)
AF Output Impedance: 4-16 Ohms
A
CCESSORIES & OPTIONS
Supplied Accessories
MH-67A8J Microphone
Available Options
YH-77STA Stereo Headphone
MH-31A8J Microphone
MD-200A8X Microphone
MLS-100 External Speaker
SP-2000 External Speaker
FP-1030A DC Power Supply
MHG-1 Carrying Handle
ATU-450 Antenna Tuner
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
Installation
Power Connections
The FT-450 is designed use from an external DC power source.
External DC power source operation
The DC power connector for the FT-450 must only be connected to a DC source providing
13.8 Volts DC (±10%), and capable of at least 22 Amperes of current. Always observe proper
polarity when making DC connections:
The Red DC power lead connects to the Positive (+) DC terminal; and
The Black DC power lead connects to the Negative (–) DC terminal.
In mobile installations, noise pickup may be minimized by connecting the DC cable directly to
your vehicle’s battery, rather than to the ignition switch or “accessory” circuitry. Direct
connection to the battery also provides the best voltage stability.
Tips for Successful Mobile Installations:
Before connecting the DC cable to the battery, measure the voltage across the
battery terminals with the engine running fast enough to show a charge. If the
voltage is above 15 Volts, the vehicle’s voltage regulator should be adjusted to
reduce the charging voltage to 14 Volts or lower.
Route the DC cable as far away from the ignition cables as possible.
If the DC cable is not long enough, use #12 AWG (minimum) stranded, insulated
wire to extend it. Be certain to solder the connections at the splice securely, and
provide ample insulation for the soldered splice (heat shrink tubing plus black
electrical tape work well).
Check the battery terminal connections frequently to be sure they are tight and not
corroded.
Caution
Permanent damage can result if improper supply voltage, or reverse-polarity voltage, is
applied to the FT-450. The Limited Warranty on this transceiver does not cover damage
caused by application of AC voltage, reversed polarity DC, or DC voltage outside the
specified range of 13.8V ±10%. Never attempt to connect the FT-450 to a 24 Volt battery
system.
When replacing fuses, be certain to use a fuse of the proper rating. The FT-450 requires a
25A fast-blow fuse.
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
Antenna Considerations
The antenna systems connected to your FT-450 transceiver are, of course, critically
important in ensuring successful communications. The FT-450 is designed for use with any
antenna system providing 50 resistive impedance at the desired operating frequency. While
minor excursions from the 50 specification are of no consequence, the power amplifier’s
protection circuitry will begin to reduce the power output of there is more than a 50%
divergence from the specified impedance (less than 33 or greater than 75, corresponding to a
Standing Wave Ratio (SWR) of 1.5:1).
Antenna Installations
When installing a “balanced” antenna such as a Yagi or dipole, remember that the FT-450 is
designed for use with an (unbalanced) coaxial feedline. Always use a balun or other
balancing device so as to ensure proper antenna system performance.
Use high-quality 50coaxial cable for the lead-in to your FT-450 transceiver. All efforts at
providing an efficient antenna system will be wasted if poor quality, lossy coaxial cable is
used. Losses in coaxial lines increase as the frequency increases, so a coaxial line with 0.5
dB of loss at 7 MHz may have 6 dB of loss at 432 MHz (thereby consuming 75% of your
transceiver’s power output!). As a general rule, smaller-diameter coaxial cables tend to have
higher losses than larger-diameter cables, although the precise differences depend on the
cable construction, materials, and the quality of the connectors used with the cable. See the
cable manufacturers’ specifications for details.
For reference, the chart below shows approximate loss figures for typically- available coaxial
cables frequently used in HF installations.
Always locate antennas such that they can never come in contact with outdoor power lines in
the event of a catastrophic support or power-pole structural failure. Ground your antennas’
support structure(s) adequately, so as to dissipate energy absorbed during a lightning strike.
Install appropriate lightning arrestors in the antenna coaxial cables (and rotator cables, if
rotary antennas are used).
In the event of an approaching electrical storm, disconnect all antenna lead-in, rotator cables,
and power cables completely from your station if the storm is not immediately in your
area. Do not allow disconnected cables to touch the case of your FT-450 transceiver or
accessories, as lightning can easily jump from the cable to the circuitry of your transceiver via
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
the case, causing irreparable damage. If a lightning storm is in progress in your immediate
area, do not attempt to disconnect the cables, as you could be killed instantly if lightning
should strike your antenna structure or a nearby power line.
If a vertical antenna is utilized, be certain that humans and/or pets and farm animals are kept
away both from the radiating element (to prevent electrical shock and RF exposure danger)
and the ground system (in the event of an electrical storm). The buried radials of a
ground-mounted vertical antenna can carry lethal voltages outward from the center of the
antenna in the event of a direct lightning strike.
RF Field Exposure
This transceiver is capable of power output in excess of 50 Watts, so customers in the United
States may be required to demonstrate compliance with Federal Communications
Commission (FCC) regulations concerning maximum permissible exposure to radio
frequency energy. Compliance is based on the actual power output used, feedline loss,
antenna type and height, and other factors which can only be evaluated as a system.
Information regarding these regulations may be available from your Dealer, your local radio
club, from the FCC directly (press releases and other information can be found on the FCC’s
site on the World Wide Web at <http://www.fcc.gov>), or from the American Radio Relay
League, Inc. (225 Main St., Newington CT 06111 or <http://www.arrl.org>).
Although there is negligible radio frequency (RF) leakage from the FT-450 transceiver itself,
its antenna system should be located as far away from humans and animals as practicable,
so as to avoid the possibility of shock due to accidental contact with the antenna or excessive
long-term exposure to RF energy. During mobile operation, do not transmit if someone is
standing adjacent to your antenna, and use the lowest power possible.
Electromagnetic Compatibility
If this transceiver is used with, or in the vicinity of, a computer or computer-driven
accessories, you may need to experiment with grounding and/or Radio Frequency
Interference (RFI) suppression devices (such as ferrite cores) to minimize interference to
your communications caused by energy from the computer. Computer-generated RFI is
usually a result of inadequate shielding of the computer’s cabinet or I/O and peripheral
connections. While computer equipment may “comply” with RF emission standards, this
does not ensure that sensitive Amateur Radio receivers like the FT-450 will not experience
FCC ID: K6620241X50
Vertex Standard Co., Ltd.
IC ID: 511B-20241X50
Operating Manual
interference from the device!
Be certain to use only shielded cables for TNC-to-Transceiver connections. You may need to
install AC line filters on the power cord(s) of the suspected equipment, and decoupling ferrite
toroidal chokes may be required on interconnecting patch/data cables. As a last resort, you
can try installing additional shielding within the computer’s case, using appropriate
conductive mesh or conductive shielding tape. Especially check “RF holes” where plastic is
used for cabinet front panels.
For further information, consult amateur radio reference guides and publications relating to
RFI suppression techniques.
Heat and Ventilation
To ensure long life of the components, be certain to provide adequate ventilation around the
cabinet of the FT-450. The cooling system of the transceiver must be free to draw cool air in
from the side of the transceiver and expel warm air from the rear of the transceiver.
Do not install the transceiver on top of another heat-generating device (such as a linear
amplifier), and do not place equipment, books, or papers on top of the transceiver. Place the
transceiver on a hard, flat, stable surface. Avoid heating vents and window locations that
could expose the transceiver to excessive direct sunlight, especially in hot climates.
CW Key/Keyer Connections
All commonly-available keyer paddles should work perfectly with the built-in Electronic Keyer.
The wiring configuration for the paddle is shown below.
For straight-key operation, only the tip and shaft connections are used.
Note: Even when using a straight key, you must use a three-conductor (“stereo”) plug. If a
two-conductor plug is used, the key line will be constantly shorted to ground.
When using an external electronic keyer, be absolutely certain that it is configured for
“positive” keying, not “negative” or “grid block” keying. The “key-up” voltage of the FT-450 is
+5V, and the “key-down” current is only about 1 mA.
For CW automated keying using a personal computer, with an external memory keyer
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