Yaesu FT-223 User manual

INSTRUCTION
MANUAL
FT-223
Y AESU MUSEN CO., LTD.
TOKYO JAPAN

TABLE OF CONTENTS
GENERAL Page
1
SPECIFICATIONS
Page
4
INSTALLATION
-
General Page 5
- Mobile Installation Page 6
-
Base Station Installation
Page 8
CONTROLS & SWITCHES Page 8
REAR PANEL CONNECTIONS Page
10
OPERATION
Page 11
THEORY OF OPERATION
-
General Page
12
- Transmitter Section
Page 12
-
Receiver Section
Page
14
-
Tone Burst Circuit Page
16
-
Tone Squelch Circuit (Optional) Page
16
MAINTENANCE
---=
-
General
Page 18
-
Routine Maintenance
Page 19
-
Adjustments
Page 20
-
Expanding Channel Capabilities
Page 24
-
Trouble -shooting
Page 26
RESISTANCE/VOLTAGE CHARTS
Page 27
PARTS LIST
Page 28

FT-223
2 METER FM TRANSCEIVER
GENERAL
The model FT-223 is a compact transceiver specifically designed
to provide high performance for amateur VHF /FM service. The
transceiver is completely solid state with provision for operation of
up to 23 crystal controlled channels between 144 and 148 MHz.
The advanced circuit design features prevent damage to the transistors
in case of high antenna VSWR, or reversed power supply polarity, while
an adjustable "tone-burst" generator is included for repeater actuation.
An additional feature, is an optional tone squelch circuit for a selective
calling system. The heavy gauge metal case provides an extremely
rugged package, light in weight, yet virtually immune to the effects
of shock and vibration.
The FT-223 VHF /FM transceiver is supplied complete with all
mounting hardware, cables, connectors and accessories required
for a mobile installation, as shown in Figure 1.
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CD
®
®
(J)
®
Figure 1.
1.
Transceiver with built-in 3
11
speaker (3 channels factory installed).
2. Dynamic push-to-talk microphone with retractable coiled cord.
3. Universal mounting bracket (with screws, washers and nuts).
4. Power cable (with cigarette lighter adapter).
5. Spare £uses.
6. Microphone hanger.
7. Miniature phone plug for external speaker.
8. Alignment tool.
9. Tap connector.
- 2 -

HOW TO USE THE TAP CONNECTOR
Do NOT strip i~ lation from wires.
1.
2.
3.
4.
5.
6.
The tap connector will handle most wire sizes used in automotive
instrument panels.
Slide the "hot" lead into tap connector as shown.
Insert transceiver power lead 3 /4 of the way into connector
(just past metal connector element).
Using pliers, press the metal connector element until it is FLUSH.
Fold the hinged cover over the connector element and snap firmly
in place.
PLASTIC INSULATOR
WITH HINGED
"SNAP-IN'' COVER
CONNECTION MADE
WITH ANY PLIERS
TYPE TOOL BY
DRIVING ELEMENT
OVER WIRES
_POWER TO
TRANSCEIVER
SLOT FOR SIDE
ENTRY OF "HOT"
WIRE
Figure 2
- 3 -
~WIRES
SELF-STRIPPING ''U''
TYPE SPRING PRESSURE
CONNECTOR ELEMENT

The compact design of the FT-223 transceiver makes it ideal
for mobile installation, operating directly from the vehicle 's
12 Volt battery. For base station use, an accessory model ,
FP-2 Two-Way Power Supply, provides operating voltage
plus a large external speaker.
SPECIFICATIONS
GENERAL
Frequency Coverage
Number of Channels
Speaker
Microphone
Power Requirement
Current Consumption
Metering
Dimensions
Weight
TRANSMITTER
RF Output
Frequency Stability
Crystal Multiplication
Modulation
Deviation
- 4 -
144 to 146 MHz or 146 to 148 MHz
23 (3 channels supplied)
an optional external VFO can be used
Internal 3
11
dynamic speaker with
provision for connecting external
4 ohm dynamic speaker
Dynamic push-to-talk microphone
with retractable coiled cord
13. 5 Volts DC, +10%
0. 45 Amp receive
1. 2 Amp transmit (LOW)
2. 3 Amp transmit (HI)
Illuminated front panel meter
indicates relative received signal
strength and transmitter power
output
180 (W) x 60 (H) x 220 (D) mm
2. 5 Kg
10 Watts (HI) or 1 Watt (LOW)
into 50 ohm load at 13. 5 Volts DC
+0.002%
12 times
F3 (phase modulation)
Up to ±_10 kHz (factory adjusted at
+5 kHz)

Audio Response
Spurious Emissions
Tone Burst
RECEIVER
Type
Intermediate Frequency
Sensitivity
Selectivity
Audio Output
+ 1, -3 dB of 6 dB / Octave
pre -emphasis characteristic
from 300 to 2500 Hz
60 dB below carrier minimum
Nominally one second at 1800 Hz
(adjustable between 1300 & 3000 Hz)
Double conversion superheterodyne
( crystal controlled)
10. 7 MHz first IF; 455 kHz
second IF
-4 dB for 20 dB quieting
±_6 kHz at 6 dB; + 12 kHz at 60 dB
2 Watts at 4 ohms
INSTALLATION
GENERAL
The model FT-223 transceiver is designed primarily for mobile
service, requiring only an antenna and a 13. 5 Volts DC power
source for operation. However, when operated in conjunction with
model FP-2 Two-Way Power Supply, the transceiver provides an
efficient compact base station. The FP - 2 power supply provides
13. 5 Volts DC to operate the transceiver from an AC power source.
The transceiver has been factory pre-tuned and requires no
adjustments for normal operation into a 50 ohm load.
The antenna location is the most important consideration in either
a base or mobile installation, with effective communication range
directly related to antenna height. The antenna should always be
in the clear and as high as possible, however, a minimum distance
of 5 feet should be maintained between the VHF and other antennas.
Also, in mobile installation, it is advisable to locate the antenna
as far from the engine as practical, in order to minimize ignition
noise pick-up. In all installations ensure that the antenna VSWR
is less than 1.5:1.
For mobile installation, the most popular antenna types are either
a 1 /4 wave whip with unity gain, or a 5 / 8 wave affording approximately
3. 5 dB gain. Mobile antennas are available from most dealers who
handle two-way mobile radip equipment, or other local electronic
suppliers.
- 5 -

To minimize losses in the antenna system, use the shortest
length of coaxial cable that is practical, avoiding any sharp
angles or kinks. Use type RG-8 /U cable if the transmission
line length exceeds 25 feet, while RG-58 /U is suitable for
shorter lengths. For all bends, form the cable into a radius
not less than 10 times its diameter.
MOBILE INSTALLATION
In mobile service the FT-223 should be installed where the
controls, indicators, and microphone are easily visible and
accessible for operation. The unit may be mounted in any
position without loss of performance . .Suitable locations are
under the dash, atop the transmission tunnel, etc. A universal
bracket is supplied with the transceiver for this purpose.
Install the FT-223 as follows ( refer to Figure 3):
1. Use the universal mounting bracket as a template
to locate the mounting holes. Use a 3 / 16" diameter
drill for these holes and allow clearance for the
transceiver, its controls and the connecting cables.
Secure the mounting bracket with the screws, washers
and nuts supplied as shown in "3A
11
,
Figure 3A.
2. Install the transceiver in the mounting bracket,
securing with the four knurled head screws and
washers as shown in
11
3B
11
,
Figure 3B.
- 6 -

Figure 3C
4. The supplied power cable may be plugged directly
into the vehicle
Is
cigarette lighter receptacle for
casual operation if desired. For a permanent
installation, the lighter plug may be removed
and the leads routed directly to the battery ( red
positive, black negative or ground), or the nearest
termination to the battery; i.e. ignition switch,
fuse block, etc. If it is necessary to extend
the power leads, use #16 AWG insulated copper wire
and do not extend the leads further than required to
prevent excessive voltage drop.
CAUTION
--------------
--------------
Before connecting the power cable to the transceiver,
check the battery voltage with the engine running
(battery charging). If the voltage exceeds 14 Volts DC,
the regulator should be readjusted so the highest
charging rate does not exceed 14 Volts. Also, be sure
to observe proper polarity when making battery
connections ( reversed polarity will not damage the
FT-223 due to the protective circuitry incorporated
in the design, however, the equipment will not operate
under this condition).
- 7 -

5. Connect the power cable to the POWER receptacle
on the rear panel.
6. Connect the 50 ohm antenna cable to the ANT receptacle
on the rear panel.
7. Connect the microphone cable to the 4-pin microphone
receptacle on the front panel.
8. An external 4 ohm speaker may be connected at the
SP receptacle on the rear panel if desired (this
automatically disconnects the internal speaker).
Use the external speaker plug supplied.
BASE STATION INSTALLATION
As a base station, the FT-223 requires a source of 13. 5 Volts DC
at 2. 6 amperes. This source may be obtained from the accessory,
FP-2 power supply.
CONTROLS & SWITCHES
The FT-223 VHF / FM transceiver has been designed for ease of
operation. Be sure you thoroughly understand the function of each
control and indicator before operating the equipment. The operating
functions are as follows.
FT-223 VHF /FM TRANSCEIVER
Figure 4.
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