UHF FM Transceiver
Vertex Standard LMR, Inc.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VX-4500
VX-4600
Series
Series
2013 Vertex Standard LMR, Inc. EC093U90G
©
Service Manual
VX-4500
Series
VX-4600
Introduction
This manual provides the technical information necessary for servicing the VX-4500/-4600 Series Mobile Transceiver.
Servicing this equipment requires expertise in handing surface-mount chip components. Attempts by non-qualified persons to
service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries.
Two PCB layout diagrams are provided for each double-sided board in this transceiver. Each side of the board is referred to by the
type of the majority of components installed on that side (“Side A” or “Side B”). In most cases one side has only chip components
(surface-mount devices), and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic
capacitors, ICs, etc.), or leaded components only.
Series
As described in the pages to follow, the advanced microprocessor design of the VX-4500/-4600 allows a complete alignment of
this transceiver to be performed without opening the case of the radio; all adjustments can be performed from the personal
computer, using with the Vertex Standard FIF-12 USB Programming Interface and CE115 Software.
While we believe the information in this manual to be correct, Vertex Standard assumes no liability for damage that may occur as
a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical
information would be appreciated.
Important Note
The VX-4500/-4600 was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus. The
solder stated above utilizes the alloy composition required for compliance with the lead-free specification, and any solder
with the above alloy composition may be used.
Contents
Specifications ................................................................. 2
DSUB 15-pin Accessory Connector ............................. 3
Exploded View & Miscellaneous Parts ........................ 4
Block Diagram ............................................................... 5
Parts List ........................................................................ 6
Circuit Description ........................................................ 7
Alignment ....................................................................... 9
Installation of Option .................................................. 23
Board Units (Schematics & Layouts)
MAIN Unit ............................................................... 24
FRONT-A Unit (VX-4500)..................................... 36
FRONT-B Unit (VX-4600)..................................... 40
Optional Units (Schematics & Layouts)
DVS-8 Voice Storage Unit ...................................... 44
1VX-4500/-4600 Series UHF FM Transceiver Service Manual
Specifications
General
Frequency Ranges: 450 - 520 MHz (512 MHz: USA only) (TYP D) /400 - 470 MHz (TYP A)
Number of Channels: 8 channels (VX-4500 Series)
Power Supply Voltage: 13.6 V ± 20 %
Channel Spacing: 12.5/20/25 kHz
Pll Steps: 5/6.25 kHz
Current Consumption (@13.6 V): 11 A (TX: 45 W)/6 A (TX: 25 W)
Operating Temperature Range: –22 °F to +140 °F (–30 °C to +60 °C)
Frequency Stability: ±2.5 ppm (–22 °F to +140 °C [–30 °C to +60 °C])
Antenna Impedance: 50 ohms
Case Size (W x H x D): 6.5” x 1.8” x 6.1” inch (165 x 45 x 155 mm) (W/O knob)
Weight (Approx.): 2.8 lbs (1.25 kg)
Receiver: measured by TIA/EIA-603
Circuit Type: Double-conversion Superheterodyne
Intermediate Frequency: 1st: 67.65 MHz, 2nd: 450 kHz
Sensitivity (12 dB SINAD): 0.25 µV
Adjacent Channel Selectivity: 70 dB (12.5 kHz)
Hum & Noise: 40 dB (12.5 kHz)
Intermodulation: 75 dB
Spurious & Image Rejection: 80 dB
Audio Output: Internal: 4 W @32 Ohms, 5% THD
512 channels with 32 group (VX-4600 Series)
2.5A (RX)
200 mA (RX: SQL Closed)
80 dB (25 kHz)
45 dB (25 kHz)
External: 12 W @4 Ohms, 5% THD
Transmitter: measured by TIA/EIA-603
Modulation Type: Variable Reactance
Power Output: 45/25/12.5/5 W
Emission Type: 16K0F3E, 11K0F3E
Maximum Deviation: ±2.5 kHz (12.5 kHz)
FM Hum & Noise: 40 dB (12.5 kHz)
Audio Distortion: < 3 % (@1 kHz)
Conducted Spurious Emission: 70 dB below Carrier
±5 kHz (25 kHz)
45 dB (25 kHz)
Receiver: measured by EN 300 086
Circuit Type: Double-conversion Superheterodyne
Intermediate Frequency: 1st: 67.65 MHz, 2nd: 450 kHz
Sensitivity (20 dB SINAD): –5 dBµ/–2 dBµ (25 kHz/12.5 kHz)
Adjacent Channel Selectivity: 70 dB (12.5 kHz)
Hum & Noise: 40 dB (12.5 kHz)
Intermodulation: 70 dB
Spurious & Image Rejection: 80 dB
Audio Output: Internal: 4 W @20 Ohms, 5% THD
75 dB (25 kHz)
45 dB (25 kHz)
External: 12 W @4 Ohms, 5% THD
Transmitter: measured by EN 300 086
Modulation Type: Variable Reactance
Power Output: 25/12.5/5/1W
Emission Type: 16K0F3E, 11K0F3E
Maximum Deviation: ±2.5 kHz (12.5 kHz)
FM Hum & Noise: 40 dB (12.5 kHz)
Audio Distortion: < 3 % (@1 kHz)
Conducted Spurious Emission: < –36 dBm@
±5 kHz (25 kHz)
45 dB (25 kHz)
<
=
1 GHz, –30 dBm>@1 GHz
Specifications subject to change without notice or obligation.
2VX-4500/-4600 Series UHF FM Transceiver Service Manual
DSUB 15-pin Accessory Connector
Pin 1: AF IN (ANALOG INPUT
External Microphone Input. Nominal input level is
4 mV (or –10 dBm; programmed via the CE115 program-
mer) at 600-ohm.
Pin 2: AF OUT (ANALOG OUTPUT
Low-level receiver output. Peak signal level is –10 dBm at
600-ohm.
)
)
Pin 3: AF GND
Ground for all logic levels and power supply return.
Pin 4: DC OUT (13.6 V DC OUTPUT
Switched 13.6V output for supplying power to an acces-
sory.
Maximum output current is 1 A.
Pin 5: RSSI (ANALOG OUTPUT
A DC voltage proportional to the strength of the signal cur-
rently being received (Receiver Signal Strength Indicator)
is provided on this pin. This low impedance output is
gererated by the receiver IF sub-system and bufferd by an
internal op-amp. Typical output voltages are 1 V (@No Sig-
nal Input) through 2.5 V (@50 dB Signal Input).
)
)
Pin 6: EXT PTT
Shorting this port to ground causes the transceiver to be
placed in the Transmit mode, while opening the connection
to this port returns the transceiver to the Receive mode.
Opening voltage is 5 V, closed current approx. 5 mA.
Pin 7: TRX
This port is intended for controlling an external TX/RX
switching circuit. When the transceiver is placed in the Re-
ceiver mode, this port is 5 V. When the transceiver is placed
in the Transmit mode, this port reduce to 0 V.
This port is open drain output which can sink approx. 50
mA when active.
Pin 8: ING (IGNITION SENSE FEATURE
The VX-4500/-4600 may be automatically be switched to
the STND-BY mode when the vehicle’s ignition key is turned
on. Maximum current is 20 mA.
)
Pin 9 - 12: ACC1 - ACC4 (ACCESSORY PORT)
These port features can be programmed via the CE115 pro-
grammer. Each port is open drain output which can sink
approx. 50 mA when active. Max. output 16 V.
When the input is selected, it becomes active between 2 V
and 16 V.
Pin 13: ACC5 (ACCESSORY PORT)
The port 5 is available to set only for Output function, and
active logic is opposite side against the Port 1 ~ 4.
Max. output 5 V, closed current approx. 1 mA (CMOS out-
put).
Pin 14: ACC6 (ACCESSORY PORT)
The port 6 is available to set only for Input function, and
active logic is opposite side against the Port 1 ~ 4.
Max. input 5 V (CMOS input).
Pin 15: GND
Chassis ground
3VX-4500/-4600 Series UHF FM Transceiver Service Manual
Exploded View & Miscellaneous Parts
Non-designated parts are available only as
part of a designated assembly.
4VX-4500/-4600 Series UHF FM Transceiver Service Manual
Block Diagram
VX-4500/-4600 Series UHF FM Transceiver Service Manual
5
Parts List
REF DESCRIPTION VALUE V/W TOL. MFR'S DESIG VXSTD P/N VERS.
MAIN UNIT CS2093701 CH:8, POW:45, TYP D
FRONT-A UNIT CB5266001 CH:8
FRONT-B UNIT CB5267001 CH:512
FRONT PANEL ASSY RA124930A CH:512
FRONT PANEL ASSY (8CH) RA124940A CH:8
CHASSIS RA123450B
TOP COVER RA123420B
PACKING PAD (COVER) RA1234300
SHIELD CASE COVER RA123460A
VOLUME KNOB RA1245900
RUBBER KNOB RA124700A
PACKING PAD (PANEL) RA1234400
SP HOLDER RA1261500
LCD HOLDER RA1244600 CH:512
LIGHT GUIDE (LCD) RA124470A CH:512
REFLECTOR SHEET (093) RA1288200 CH:512
INTER CONNECTOR RA1244800 CH:512
SPONGE RUBBER (LCD) RA0786900 CH:512
REFLECTOR SHEET (SUB) RA1292600 CH:512
HOLDER (LED) RA124680A CH:8
LIGHT GUIDE (LED) RA1246900 CH:8
SHEET (LED) RA1254600 CH:8
LED FILTER (8CH) RA0997300 CH:8
SEMS SCREW ASM3X8NI U03308002
BIND HEAD TAPTITE-B M3X8 U24308001
BIND HEAD TAPTITE-B M3X6 U24306001
SPRING LOCK WASHER
PCB with Components
CS2093702 CH:512, POW:45, TYP D
CS2093703 CH:8, POW:45, TYP A
CS2093704 CH:512, POW:45, TYP A
CS2093705 CH:8, POW:25, TYP A
CS2093706 CH:512, POW:25, TYP A
Mechanical Parts
SW2.6 U71002001
LOT
SIDE
LAY ADR
SPEAKER 20-ohm 5015134H02 M4090203
CONNECTOR (AC093U) P1091412A
CD1001 CERAMIC DISC JTBM450CX24-A H7901530A B b4
CF1001 CERAMIC FILTER LTM450GW-A H3900573A A H4
CF1002 CERAMIC FILTER LTM450EW-A H3900574A A G4
CF1003 CERAMIC FILTER LTM450GW-A H3900573A A H4
F 1001 CHIP FUSE 1.25A FCC16 132ABTP Q0000109 A B1
F 1002 CHIP FUSE 1.25A FCC16 132ABTP Q0000109 A C5
Q 1001 IC NJM7808DL1A-TE1 G1093802 A C3
Q 1003 IC TDA1519CTH G1093778 B g3
Q 1013 IC RA60H4452M1 G1094520 45 W, D A C1
Q 1013 IC RA55H4047M G1094344 45 W, A A C1
Q 1013 IC RA30H4047M1-101 G1094555 25 W, A A C1
Q 1042 FET 2SK880GR(TE85R.F) G3808807G B d4
Q 1044 FET 3LN01S-TL G3070330 B g2
X 1001 XTAL 32.768kHz 4809995L18 32.768KHZ H0103407 A A4
X 1002 TCXO 16.8MHz TTS14VSB-A5 16.8MHZ H9501150 A F4
XF1001 XTAL FILTER MFT67P 67.650MHZ H1102471 A G4
FRONT-A UNIT (VX-4500) Electrical Parts
J 2004 LEAF SPRING RA129670C B e1
J 2005 LEAF SPRING RA129670C B a1
VR2001 POT. RK09L1140 20KB J60800312 A B1
FRONT-B UNIT (VX-4600) Electrical Parts
DS3001 LCD GTG4795SK01 G6090215 A C1
J 3004 LEAF SPRING RA129670C B e1
J 3005 LEAF SPRING RA129670C B a1
Q 3001 TRANSISTOR 2SB1132 T100 R G3211327R B c1
Q 3003 IC HA178L09UA-TL-E G1094350 B d2
TH3001 THERMISTOR ERTJ0EV473J G9090120 B c1
VR3001 POT. RK09L1140C33 20KB J60800312 A B1
Electrical Parts
MAIN UNIT Electrical Parts
6VX-4500/-4600 Series UHF FM Transceiver Service Manual
Circuit Description
1. Circuit Configuration by Frequency
The receiver is a double-conversion superheterodyne with a first
intermediate frequency (IF) of 67.65 MHz and a second IF of
450 kHz. Incoming signal from the antenna is mixed with the
local signal from the VCO/PLL to produce the first IF of 67.65
MHz. This is then mixed with the 67.2 MHz second local oscil-
lator output to produce the 450 kHz second IF. This is detected
to give the demodulated signal. The transmit signal frequency
is generated by the PLL VCO and modulated by the signal from
the microphone. It is then amplified and sent to the antenna.
2. Receiver System
2-1. Front-end RF amplifier
Incoming RF signal from the antenna is delivered to the RF
Unit and passes through the Low-pass filter. Undesired frequen-
cies are removed by the varactor diode tuned band-pass filter
consisting of diodes D1013 & D1015 (both RKV500KJ) and
Coils L1015 & L1018, and capacitors C1017, C1116, C1118,
C1130, C1117, C1135, C1137, C1139, C1151, and C1156. The
passed signal is amplified by Q1021 (2SC3356) and more-
over cuts animage frequency with the tuned band pass filter
consisting of Coils L1025, & L1028, and capacitors C1173,
C1181, C1182, C1183, C1188, C1197, C1198, C1205, &
C1212. The filtered RF signal is then delivered to the first Mixer.
2-2. First Mixer
The 1st mixer consists of Q1040 (AK1220). Buffered output
from the VCO is amplified by Q1026 (2SC5226) to provide a
pure first local signal between 382.35 and 444.35 MHz for in-
jection to the first mixer. The output IF signal is sent to the
crystal filter. The IF signal then passes through monolithic crystal
filter XF1001 (± 5.5 kHz BW) to strip away all but the desired
signal.
2-3. IF Amplifier
The first IF signal is amplified by Q1049 (2SC5226). The am-
plified first IF signal is applied to FM IF subsystem IC Q1054
(NJM2591V) which contains the second mixer, second local
oscillator, limiter amplifier, noise amplifier, and S-meter am-
plifier. The signal from reference oscillator X1002 is multiplied
3 times in Q1054 (NJM2591V). It is mixed with the first IF
signal and becomes the second IF signal of 450 kHz. The sec-
ond IF then passes through the ceramic filter CF1002 (for wide
channels) or CF1001 and CF1003 (for narrow channels) to strip
away unwanted mixer products and remove amplitude varia-
tions in the 450 kHz IF before detection of the speech by the
ceramic discriminator CD1001.
2-4. Audio amplifier
Detected signal from Q1054 (NJM2591V) is delivered to
Q1010 (FQ0801) pin 28 and is output by Q1010 (FQ0801)
pin 17 through the band pass filter. When the optional unit is
installed, Q1010 (FQ0801) is made “OFF” and the AF signal
from Q1010 (FQ0801) pin 21 goes to the optional unit and
returns to Q1010 (FQ0801) pin 20 from the optional unit. When
the optional unit is not installed, Q1010 (FQ0801) is made
“ON” the AF signal goes through Q1010 (FQ0801) pin 20/21.
The signal is stored in the AF volume via AF mute and the de-
emphasis inside Q1010 (FQ0801). The AF volume is control-
ling Q1010 (FQ0801) by the CPU. After that, itrnters AF power
amplifire Q1003 (TDA1519CTH) after passing AF volume.
The output of Q1003 (TDA1519CTH) drives a speaker (it
chooses the external SP or internal SP in J1001).
2-5. Squelch Circuit
There are 16 levels of squelch setting from 0 to 15. The level 0
means open squelch. The level 1 means the threshold setting
Level and level 15 means tight squelch. From 1 to 14 is estab-
lished in the middle of threshold and tight. The bigger figure is
nearer the tight setting. The level 16 becomes setting of carrier
squelch.
2-5-1. Noise Squelch
The noise squelch circuit is composed of the band pass filter of
Q1054 (NJM2591V), noise amplifier Q1060 (2SC4617), and
noise detector D1048, D1052 (both DA221). When a carrier
isn’t received, the noise ingredient which goes out of the de-
modulator Q1054 (NJM2591V) is amplified in Q1060
(2SC4617) through the band pass filter Q1054 (NJM2591V),
is detected to DC voltage with D1048 and D1052 (both DA221),
and is inputted to pin 15 the A/D port of the Q1041
(LC88F52H0A) CPU. When a carrier is received, the DC volt-
age becomes “LOW” because the noise is compressed. When
the detected voltage to CPU is “HIGH”, the CPU stops AF out-
put with Q1010 (FQ0801) “OFF”. When the detected voltage
is low, the CPU makes Q1010 (FQ0801) “ON” and the AF
signal is output.
2-5-2. Carrier Squelch
Pin 14 (A/D port) of Q1047 (NJM2904V) CPU detects RSSI
voltage output from pin 12 of Q1054 (NJM2591V), and con-
trols AF output. The RSSI output voltage changes according to
the signal strength of carrier. The stronger signal causes the
RSSI voltage to be higher voltage. The process of the AF signal
control is the same as Noise Squelch. The shipping data is ad-
justed 3 dB higher than squelch tight sensitivity.
7VX-4500/-4600 Series UHF FM Transceiver Service Manual
Circuit Description
3. Transmitter System
3-1. Mic Amplifier
The AF signal from microphone jack J2001 (VX-4500) or J3001
(VX-4600) is amplified with microphone amplifier in Q1010
(FQ0801), is amplified a second time after microphone selec-
tion switch Q1010 (FQ0801), and passes through microphone
gain volume in Q1010 (FQ0801). The control from the CPU
passes output and it passes a pre-emphasis circuit. When an
option unit is installed, the AF signal from Q1010 (FQ0801)
pin 38 goes through the option unit, and returns to Q1010
(FQ0801) pin 39. When an option unit isn't installed, Q1010
(FQ0801) is inputted to the pre-emphasis circuit. The signal
passes the limiter and splatter filter of Q1010 (FQ0801), and
is adjusted by maximum deviation adjustment volume. The ad-
justed low frequency signal ingredient is amplified by Q1047
(NJM2904V), added modulation terminal of TCXO (X1002),
the FM modulation is made by reference oscillator.
The high frequency signal ingredient is amplified, and adjusted
the level by volume Q1010 (FQ0801) to make frequency bal-
ance between low frequency. After that, it is made FM modula-
tion to transmit carrier by the modulator D1026 (HVC300A)
of VCO.
3-2. Drive and Final amplifier
The modulated signal from the VCO Q1034 (2SK508) is buff-
ered by Q1026 (2SC5226) and amplified by Q1017
(2SC3357). The low-level transmit signal is then applied to
the Power Module Q1013 (RA60H4452M1: for 50 W,
RA30H4047M1: for 25 W) for final amplification up to 50 or
25 watts watts output power. The transmit signal is then low-
pass filtered to suppress away harmonic spurious radiation be-
fore delivery to the antenna.
3-3. Automatic Transmit Power Control
The output power of Power Module is detected by CM coupler,
it is detected by D1005 & D1008 (both HSM88AS) and is in-
put to comparator Q1048 (NJM12902V). The comparator com-
pares two different voltages and makes output power stable by
controlling the bias voltage of the Power Module. There are 4
levels of output power (Hi, Lo3, Lo2, and Lo1) it is switched
by the Voltage of Q1010 (FQ0801) pin 44.
4. PLL Frequency Synthesizer
The frequency synthesizer consists of PLL IC Q1043
(AK1541), VCO, TCXO (X1002), and buffer amplifier. The
output frequency from TCXO is 16.8 MHz and the tolerance is
± 2.5 ppm (in the temperature range –22 °F to +140 °F [–30 °C
to +60 °C]).
4-1. VCO
While the radio is receiving, the RX oscillator Q1034 (2SK508)
in VCO generates a programmed frequency between 382.35
and 444.35 MHz as 1st local signal. While the radio is transmit-
ting, the TX oscillator Q1036 (2SK508) in VCO generates a
frequency between 450 and 512 MHz. The output from the os-
cillator is amplified by buffer amplifier Q1029 (2SC5226) and
becomes output of VCO. The output from the VCO is divided,
one is amplified by Q1039 (2SC5226) and feed back to pin 17
of the PLL IC Q1043 (AK1541). It is amplified about the RF
signal Q1029 (2SC5226) which was made by VCO. RF
changes with the carrier signal of the transmitter and the mixer
local signal of the receiver with D1020 (DAN222).
4-2. VCV CNTL
Tuning voltage (VCV) of the VCO is expanding the lock range
of VCO by controlling of the varactor diode at the voltage and
the control voltage from PLL IC Q1043 (AK1541). As for the
control voltage adjustment by the varactor diode, it controls the
negative voltage to make with Q1025 (TPS60303) with the
D/A converter inside Q1010 (FQ0801) and Q1037
(NJM2125F), it has the anode potential of the varactor diode
variably
4-3. PLL
The PLL IC Q1043 (AK1541) consists of reference divider,
main divider, phase detector, charge pumps and delta-sigma frac-
tional accumulator. The reference frequency from TCXO is in-
putted to pin 10 of PLL IC Q1043 (AK1541) and is divided by
reference divider. This IC is decimal point dividing PLL IC
Q1043 (AK1541) and the dividing ratio becomes 1/8 of usual
PLL frequency step. Therefore, the output of the reference di-
vider is 8 times the frequency of the channel step. For example
when the channel stepping is 5 kHz, the output of reference
divider becomes 40 kHz. On the other hand, inputted feed back
signal to pin 1 of PLL IC Q1043 (AK1541) from VCO is di-
vided with the dividing ratio which becomes the same frequency
as the output of reference divider. These two signals are com-
pared by the phase detector, and the phase difference pulse is
generated. The phase difference pulse and the pulse from frac-
tional accumulator pass through the charge pumps and LPF. It
becomes the DC voltage (VCV) to control the VCO. The oscil-
lation frequency of VCO is locked by the control of this DC
voltage. The PLL serial data from CPU Q1041 (LC88F52H0A)
is sent with three lines of SDO (pin 20), SCK (pin 22) and PSTB
(pin 45). The lock condition of PLL is output from the UL (pin
18) terminal and UL becomes “H” at the time of the lock condi-
tion and becomes “L” at the time of the unlocked condition.
The CPU Q1041 (LC88F52H0A) always watches over the UL
condition, and when it becomes “L” unlocked condition, the
CPU Q1041 (LC88F52H0A) prohibits transmitting and receiv-
ing.
8VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
Introduction
The VX-4500/-4600 series has been aligned at the factory for
the specified performance across the entire frequency range
specified. Realignment should therefore not be necessary ex-
cept in the event of a component failure. All component re-
placement and service should be performed only by an autho-
rized Vertex Standard representative, or the warranty policy
may be voided.
The following procedures cover the sometimes critical and te-
dious adjustments that are not normally required once the trans-
ceiver has left the factory. However, if damage occurs and some
parts are replaced, realignment may be required. If a sudden
problem occurs during normal operation, it is likely due to com-
ponent failure; realignment should not be done until after the
faulty component has been replaced.
We recommend that servicing be performed only by authorized
Vertex Standard service technicians who are experienced with
the circuitry and fully equipped for repair and alignment. There-
fore, if a fault is suspected, contact the dealer from whom the
transceiver was purchased for instructions regarding repair.
Authorized Vertex Standard service technicians realign all cir-
cuits and make complete performance checks to ensure com-
pliance with factory specifications after replacing any faulty
components. Those who do undertake any of the following align-
ments are cautioned to proceed at their own risk. Problems
caused by unauthorized attempts at realignment are not cov-
ered by the warranty policy. Also, Vertex Standard must re-
serve the right to change circuits and alignment procedures in
the interest of improved performance, without notifying own-
ers. Under no circumstances should any alignment be attempt-
ed unless the normal function and operation of the transceiver
are clearly understood, the cause of the malfunction has been
clearly pinpointed and any faulty components replaced, and the
need for realignment determined to be absolutely necessary.
The following test equipment (and thorough familiarity with its
correct use) is necessary for complete realignment. Correction
of problems caused by misalignment resulting from use of im-
proper test equipment is not covered under the warranty policy.
While most steps do not require all of the equipment listed, the
interactions of some adjustments may require that more com-
plex adjustments be performed afterwards. Do not attempt to
perform only a single step unless it is clearly isolated electrical-
ly from all other steps. Have all test equipment ready before
beginning, and follow all of the steps in a section in the order
presented.
Required Test Equipment
Radio Tester with calibrated output level at 1 GHz
In-line Wattmeter with 5% accuracy at 1 GHz
50-ohm, 50-W RF Dummy Load
Regulated DC Power Supply (standard 13.6V DC, 15A)
Frequency Counter: ±0.2 ppm accuracy at 1 GHz
AF Signal Generator
AC Voltmeter
DC Voltmeter
UHF Sampling Coupler
IBM® PC/compatible Computer with Microsoft® Windows
2000, XP, Vista or Windows7
Vertex Standard CE115 PC Programming Software
Vertex Standard FIF-12 USB Programming Interface and
CT-104A, CT-106, or CT-171 PC Programming Cable
Vertex FRB-6 Tuning Interface Box and CT-159 Connec-
tion Cable
Alignment Preparation & Precautions
A 50-ohm RF Dummy load and in-line wattmeter must be con-
nected to the main antenna jack in all procedures that call for
transmission, except where specified otherwise. Correct align-
ment is not possible with an antenna.
Beacuse of the BTL (Bridged Trans Less) Amplifier circuit used
in the VX-4500/-4600, do not connect eather side of the speak-
er leads to chassis “ground”.
After completing one step, read the following step to determine
whether the same test equipment will be required. If not, re-
move the test equipment (except dummy load and wattmeter, if
connected) before proceeding.
Correct alignment requires that the ambient temperature be the
same as that of the transceiver and test equipment, and that this
temperature be held constant between 20 °C and 30 °C (68 °F ~
86 °F). When the transceiver is brought into the shop from hot
or cold air, it should be allowed time to come to room temper-
ature before alignment.
Whenever possible, alignments should be made with oscillator
shields and circuit boards firmly affixed in place. Also, the test
equipment must be thoroughly warmed up before beginning.
Note: Signal levels in dB referred to in this procedure are based
on 0 dBµ EMF = 1.0 µV.
®
9VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
Test Setup
Setup the test equipment as shown below, and then apply 13.6V
DC power to the transceiver.
50-ohm
Dummy Load
Inline
Wattmeter
RF Signal
Generator
Sampling
Coupler
VX-4500/-4600
ANT
DC INPUT
The Alignment Tool Outline
Installation of the alignment tool
Install the CE115 (PC Programming Software) to your PC.
“Alignment“ function in the “Radio“ menu tab of CE115.
Action of the switches
When the transceiver is in the “Alignment mode,“ the action of
the PTT and all PF KEYS are ignored. All of the action is con-
trolled by the PC.
Caution!
Please never turn off the power supply during alignment.
If the power supply is turned off during alignment, the
alignment data will be corrupted.
SP/LOAD Switch: LOAD
MIC & EXT SP
D-Sub 15-pin
Connector
CT-159
LOAD Switch: 4W
FRB-6
CLONE Port
SP OUT B
CT-104A, CT-106, or CT-171
MIC IN
SINAD Meter
AF Signal
Generator
Deviation
Meter
Frequency
Counter
Power Supply
13.6 VDC
FIF-12
Computer
(
CE115
)
10VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
Alignment Mode
The Alignment mode allows you to align the entire radio. The
value of each parameter can be changed to the desired value by
use of the “” / “” and up/down arrow keys, along with di-
rect number input and dragging of the PC mouse.
To enter the Alignment Mode, select “Alignment” in the main
“Radio” menu. It will start to “Upload” the alignment data from
the radio to the PC. Pressing the “OK” button will then “Down-
load” the alignment data to the radio and exit the Alignment
Mode.
Note: when all items are to be aligned, it is strongly recom-
mended to align them according to the following sequence. De-
tailed information for each step may be found in the “Help” file
within CE115 (PC Programming Software).
1. VCO (Please do not adjust it)
2. PLL Reference Frequency (Frequency)
3. RX Sensitivity (RX Tune)
4. Squelch (SQL/RSSI)
5. TX Power <High/Low3/Low2/Low1>
6. Maximum Deviation <Wide/Narrow>
Please adjust the following items when needed.
❍ Modulation Balance <Wide/Narrow>
❍ CTCSS Deviation <Wide/Narrow>
❍ DCS Deviation <Wide/Narrow>
❍ DTMF Alignment
❍ Seq Tone
❍ VOX ON Level
❍ TX MSK
❍ Ext AF Out
Unit
During alignment, you may select the value among
dBµV,µV (EMF or PD), or dBm.
When performing the “RX Tune” and “SQL” alignment,
the RF level shows this unit according to this setting.
➠
11VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
1. VCO (RX VCO/TX VCO) - Normally there is no need to adjust this parameter -
This parameter is to align the VCO Voltage adjustment.
2. PLL Reference Frequency (Frequency
This parameter is to align the reference frequency for PLL.
1. Press the “Frequency” button to start the alignment.
The Frequency Alignment window will appear.
2. Click the “PTT” button or press the “SPACE” bar, and the
radio will start to transmit on the center frequency channel.
3. Set the value to get the desired frequency by dragging the
slide bar, clicking the up-down button, pressing the left or
right arrow key, or entering the value in the entry box.
4. After getting the desired frequency click the “PTT” button
or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the frequency alignment
and save the data.
)
➠
12VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
3. RX Sensitivity (RX Tune)
This parameter is to align the RX BPF (Band Pass Filter) for Receive (RX) sensitivity. The PLL Reference Frequency (Frequency)
alignment must be done before this alignment is performed.
1. Press the “RX Tune” button to start the alignment. The RX
Sensitivity Alignment window will appear.
2. Click the left mouse button on the slide bar or press the Up
/ Down arrow keys, to switch to the desired channel for
alignment.
3. Set the Signal Generator according to the indication at the
top of the screen (Setting Your SG as followings).
4. Drag the slide bar, click the up-down buttons, press the left
or right arrow key, or enter the value in the entry box to get
the best RX sensitivity (Highest RSSI value) on the select-
ed channel.
5. Click the “OK” button to finish the RX Sensitivity align-
ment and save the data.
ADJ Type
Basic: “Low-edge / band center / high-edge“ and se-
lect the channel for alignment (Default).
Single: Alignment value changes only on the selected
channel.
All Freq: Alignment value changes on all channels.
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13VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
4. Squelch (SQL)
This parameter is to align the SQL (Squelch) Sensitivity.
There are several alignments as follows in the Squelch Sensitivity.
Tight SQL Level (TI NSQ W/N)
The Alignment for the Noise SQL Tight level at Wide (5k/4k)
or Narrow (2.5k).
Threshold SQL Level (TH NSQ W/N)
The Alignment for the Noise SQL Threshold level at Wide (5k/
4k) or Narrow (2.5k).
Tight SQL RSSI Level (TI RSSI W/N)
The Alignment for the “level 14” of the RSSI SQL level at Wide
(5k/4k) or Narrow (2.5k).
TX Save RSSI Level (TX SAVE W/N)
The Alignment for the TX Save RSSI level at Wide (5k/4k) or
Narrow (2.5k).
The procedure for all the alignments is as follows.
1. Click the “Start” button to open the alignment window in
the SQL/RSSI Alignment menu.
2. The Alignment window will appear, Set the Signal Genera-
tor according to the indication, then click the “Start” but-
ton.
3. The automatic alignment will start to get the SQL or RSSI
level.
4. It will show the alignment result in the “New” box.
5. Click the “OK” button, then the data will be saved and the
alignment is finished.
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14VX-4500/-4600 Series UHF FM Transceiver Service Manual
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