Vertex Standard EVX-261 User manual

EVX-261 UHF Digital/Analog Transceiver Service Manual 1
Introduction
This manual provides the technical information necessary for servicing the EVX-261 UHF Digi-
tal/Analog Transceiver.
Servicing this equipment requires expertise in handing surface-mount chip components. At-
tempts 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.
As described in the pages to follow, the advanced microprocessor design of the EVX-261 Trans-
ceiver allows a complete alignment of this transceiver to be performed without opening the case
of the radio; all adjustments can be performed from the front panel, using the “Alignment Mode”
menu.
While we believe the information in this manual to be correct, Vertex Standard assumes no li-
ability 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 ap-
preciated.
Important Note
This transceiver is 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
Exploded View & Miscellaneous Parts.......................................................................................................................4
Parts List.......................................................................................................................................................................5
Block Diagram..............................................................................................................................................................6
Circuit Description.......................................................................................................................................................7
Alignment......................................................................................................................................................................8
Cloning ........................................................................................................................................................................16
Main Unit (FR028100D) Circuit Diagram..............................................................................................................17
Vertex Standard LMR, Inc.
©2016 Vertex Standard LMR, Inc.
EC137U90C
UHF Digital/Analog Transceiver
EVX-261
Service Manual

EVX-261 UHF Digital/Analog Transceiver Service Manual 2
Specifications: USA (NA)& Except Europe (CE)
General
Frequency range: 403-470 MHz (Type “G6”)
450-520 MHz (Type “G7”) (USAModel: 450-512 MHz)
Channel: 16 Channels
Emission Type: 16K0F3E / 11K0F3E (Analog)
7K60F1E / 7K60FXE (Digital: 12.5 kHz Voice)
7K60F1D / 7K60FXD (Digital: 12.5 kHz Data)
7K60F1W (Digital: Combination of 12.5 kHz Voice & Data)
Power Supply Voltage: 7.4 V DC ± 10%
Current Consumption: <2.0 A (5 W TX)
Channel Separation: 12.5 / 25 kHz (Analog) (USA Model: 12.5 kHz)
12.5 kHz (Digital)
IP Rating: IP55
Operating Temperature Range: –22 °F to +140 °F (–30 °C to +60 °C)
Charging Temperature Range: +32 °F to +113 °F (0 °C to +45 °C)
Frequency Stability: ±1.5 ppm
Antanna Impedance: 50 Ohm (unbalanced)
Dimension (W x H x D): 2.3 x 4.3 x 1.3 inches (58.4 x 109 x 32.3 mm) (with FNB-V133LI-UNI)
2.3 x 4.3 x 1.6 inches (58.4 x 109 x 40.6 mm) (with FNB-V134LI-UNI)
Weight (Approx.): 9.9 oz (281 g) (with FNB-V133LI-UNI, Antenna, Belt Clip)
11.6 oz (330 g) (with FNB-V134LI-UNI, Antenna, Belt Clip)
Receiver(Measured by TIA/EIA-603)
Circuit Type: Direct Conversion
Sensitivity: 0.25 μV (Analog, 12 dB SINAD)
0.28 μV (Digital, 1 % BER)
Adjacent Channel Selectivity: 70 dB (25 kHz)
60 dB (12.5 kHz)
Hum and Noise: 45 dB (25 kHz)
40 dB (12.5 kHz)
Intermodulation: 70 dB
Spurious Image Rejection: 70 dB
Conducted Spurious: –57 dBm
Audio output: 700 mW (intemal @ 16 Ohm 5% THD)
500 mW (extemal @ 4 Ohm 5% THD)
Transmitter (Measured by TIA/EIA-603)
Output Power: 5 / 1 W
Modulation: Sigma Delta Modulation
Maximum Frequency Deviation: ±5.0 kHz (25 kHz Step, Analog)
±2.5 kHz (12.5 kHz Step, Analog)
1745 Hz - 2138 Hz (12.5 kHz Step, Symbol Deviation)
Conducted Spurious Emissions: –36 dBm @<
=1 GHz, –30 dBm @> 1 GHz
FM Hum & Noise: 45 dB (25 kHz)
40 dB (12.5 kHz)
Audio Distortion: <5% @ 1 kHz
Specifications subject to change without notice or obligation.

EVX-261 UHF Digital/Analog Transceiver Service Manual 3
Specifications: Europe (CE)
General
Frequency range: 403-470 MHz (Type “G6”)
450-520 MHz (Type “G7”)
Channel: 16 Channels
Emission Type: 16K0F3E / 11K0F3E (Analog)
7K60F1E / 7K60FXE (Digital: 12.5 kHz Voice)
7K60F1D / 7K60FXD (Digital: 12.5 kHz Data)
7K60F1W (Digital: Combination of 12.5 kHz Voice & Data)
Power Supply Voltage: 7.4 V DC ± 10%
Current Consumption: <2.0 A (5 W TX)
Channel Separation: 12.5 / 25 kHz (Analog)
12.5 kHz (Digital)
IP Rating: IP55
Operating Temperature Range: –30 °C to +60 °C
Charging Temperature Range: 0 °C to +45 °C
Frequency Stability: ±1.5 ppm
Antenna Impedance: 50 Ohm (unbalanced)
Dimension (W x H x D): 58.4 x 109 x 32.3 mm (with FNB-V133LI-UNI)
58.4 x 109 x 40.6 mm (with FNB-V134LI-UNI)
Weight (Approx.): 281 g (with FNB-V133LI-UNI, Antenna, Belt Clip)
330 g (with FNB-V134LI-UNI, Antenna, Belt Clip)
Receiver(Measured by EN 300 086)
Circuit Type: Direct Conversion
Sensitivity: 0.4 μV (Analog, 20 dB SINAD)
0.28 μV (Digital, 1 % BER)
Adjacent Channel Selectivity: 70 dB (25 kHz)
60 dB (12.5 kHz)
Hum and Noise: 45 dB (25 kHz)
40 dB (12.5 kHz)
Intermodulation: 65 dB
Spurious Image Rejection: 70 dB
Conducted Spurious: –57 dBm
Audio output: 700 mW (intemal @ 16 Ohm 5% THD)
500 mW (extemal @ 4 Ohm 5% THD)
Transmitter (Measured by EN 300 086)
Output Power: 5 / 1 W
Modulation: Sigma Delta Modulation
Maximum Frequency Deviation: ±5.0 kHz (25 kHz Step, Analog)
±2.5 kHz (12.5 kHz Step, Analog)
1745 Hz - 2138 Hz (12.5 kHz Step, Symbol Deviation)
Conducted Spurious Emissions: –36 dBm @<
=1 GHz, –30 dBm @> 1 GHz
FM Hum & Noise: 45 dB (25 kHz)
40 dB (12.5 kHz)
Audio Distortion: <5% @ 1 kHz
Specifications subject to change without notice or obligation.

EVX-261 UHF Digital/Analog Transceiver Service Manual 4
Exploded View & Miscellaneous Parts
Non-designated parts are available only as part of a designated assembly.
MAIN UNITASSY
CB7110000 (TYPE “G6”)
CB7109000 (TYPE “G7”)
FRONT CASE ASSY (COMPONENT)
FRONT CASE
NAME PLATE
MODEL LABEL (EVX-261)
RUBBER (PTT)
FLAME (PTT)
RUBBER (SIDE)
LATCH NAIL
LATCH PLATE
COIL SPRING (2.2x12x0.25)(x2 pcs)
INDICATOR
SPEAKER
SP NET
WIRE ASSY (BLK65)
WIRE ASSY (YEL65)
SHEET (MICROTEX 8x4)
PAN HEAD SCREW (M2x3BUS #2)
MAIN UNIT ASSY (COMPONENT)
Printed Circuit Board with Components
HOLDER RUBBER (MIC)
SHIELD CASE COVER (FET)
RING NUT (x2 pcs)
PAN HEAD TAPTITE-B (M2x5)(x14 pcs)
CHASSIS ASSY (COMPONENT)
CHASSIS
CONNECTOR (5MAF11S-T02)
RUBBER PACKING
RUBBER BOOTS
GROUND PLATE
SHEET (6x6)
SHEET (MICROTEX C010)
CAUTION LABEL
BIND HEAD TAPTITE-B (2x10)(x2 pcs)
MIC/SP CAP ASSY (COMPONENT)
CAP (MIC/SP)
O RING (CAP)
O RING (0.8x2.2)(x2 pcs)
BIND HEAD SCREW (M2.6x6B)(x2 pcs)














MIC/SP CAPASSY
CB6642000
KNOB (VOL)
RA161270A
KNOB (FREQ)
RA1612800
SHIELD CASE COVER (FET)
RA125020A
RING NUT
RA157250A (x 2 pcs)
SHEET (6x6)
RA037690B
RUBBER BOOTS
RA1458000 RUBBER PACKING
RA1649300
CHASSIS ASSY
CB7108000
CAUTION LABEL
RA1646100A
SHEET (MICROTEX C010)
RA0292100
FRONT CASE ASSY
CB7107000
BELT CLIP (CLIP-20)
AAH12X101
Li-Ion BATTERY PACK
AAJ67X001
(FNB-V133LI-UNI)
or
AAJ68X001
(FNB-V134LI-UNI)

LATCH NAIL
RA145350B
LATCH PLATE
RA1453400
COIL SPRING (2.2x12x0.25)
RA0745400 (x 2 pcs)

DESCRIPTION
PAN HEAD SCREW M2X3BSUS #2
BIND HEAD TAPTITE-B 2X10
PAN HEAD TAPTITE-B M2X5
VXSTD P/N
U07230227
U24110001
U44105001
QTY.
1
2
14
REF.




EVX-261 UHF Digital/Analog Transceiver Service Manual 5
Parts List
REF. DESCRIPTION VALUE MFR’s DESIG VXSTD P/N
When replace a chip fuse,
use the part of the same type and value.
FRONT CASE ASSY CB7107000
MIC/SP CAPASSY CB6642000
CHASSIS ASSY CB7108000
RUBBER PACKING RA1649300
RUBBER BOOTS RA1458000
SHEET (6X6) RA037690B
SHEET (MICROTEX C010) RA0292100
CAUTION LABEL RA1614100
BIND HEAD TAPTITE-B (x2 psc) 2X10 U24110001
MECHANICAL PARTS
KNOB (VOL) RA161270A
KNOB (FREQ) RA1612800
MAIN UNITASSY CB7110000: TYPE “G6”
CB7109000: TYPE “G7”
F 1001 CHIP FUSE 3.15A, 36V FHC16 322ADTP Q0000118
MC1001 MIC. ELEMENT PF0-1055P M3290045
Q 1012 FET RQA0011DNS#G0 G3070507
S 1001 TACT SWITCH EVQPUB02K N5090167
S 1002 TACT SWITCH EVQPUB02K N5090167
S 1003 TACT SWITCH EVQPUB02K N5090167
S 1004 ROTARY SWITCH TP7LBJT16 RY-10487 Rev.1 N0190199A
TH1001 THERMISTOR TH05 4B473FR G9090150
VR1001 POT. TP7LBRN1 B503 RY-10489 J60800323
X 1001 TCXO 19.2MHz NT2520SB 19.2MHZ H9501523
SHIELD CASE COVER (FET) RA125020A
RING NUT (x2 psc) RA157250A
PAN HEAD TAPTITE-B (x14 psc) M2X5 U44105001

Block Diagram
EVX-261 UHF Digital/Analog Transceiver Service Manual 6
LPF
LOOP
FILTER
BPF BPF
ANT SW
D1004, 1005
1SS390
TYPE G6 : 403 - 470 MHz“
TYPE G7 : 450 - 520 MHz (USA: 450 - 512 MHz)“
TYPE G6 : 806 - 860 MHz“
TYPE G7 : 900 - 960 MHz“
TYPE G6 : 860 - 940 MHz“
TYPE G7 : 940 - 1040 MHz“
19.2 MHz
ø1: TX RF
TYPE G6 : 403 - 470 MHz
“
TYPE G7 : 450 - 520 MHz (USA: 450 - 512 MHz)“
ø2: VCO IN
TYPE G6 : 806 - 940 MHz
“
TYPE G7 : 900 - 1040 MHz (USA: 900 - 1024 MHz)“
ANT SW
D1002
RN1425
FINAL AMP
Q1012
RQA001
DRIVER
Q1020
RQA004
AF AMP
Q1027
TDA2822G
SW
Q1010
RTQ030P02
SW REG
Q1013
ST1S10PUR
POWER MANAGEMENT
Q1005
LP8725
POWER MANAGEMENT IC
RF IC
Q1044
RODINIA LITE
MICROPROCESSOR
Q1050
OMAP
MICROPROCESSOR
RESET
Q1007
REG
Q1016
TAR5S50U
S-80820CNMC
SWITCH
Q1047
TS3USB221
SWITCH
Q1053
SSM3K15
SWITCH
Q1037
2SA1774
LPF
Q1060
2SC4617
SWITCH
Q1029
RTQ030P02
SWITCH
Q1011
RUM002N02
SWITCH
Q1004
RUM002N02
VOL/SW
VR1001
PWR CNTL
Q1006
AD8566ARM
BUFF AMP
Q1026
2SK3077
LNA AMP
Q1022
2SC5006
ATT
Q1054
SKY12338
ATT0 CNTL
RX 5V
· VRF1 2V8
VRF2 2V8·
VWLAN 1V8·
SW3 1V8·
RF 5V·
· VWLAN 3V3
DIG 1V2·
SW1 1V2·
SW3 1V8·
VCO 5V
VCO 5V
VCO 5V SW+B
RF 5V
VAN 3V3 VAN 3V3 VAN 3V3
ROTARY SW4
ROTARY SW1
ROTARY SW2
ROTARY SW3
LED G
LED R
INT PTT
OSC IN
UART1 TXD
UART1 RXD
TR SW
JTAG
(16-PIN CONNECTOR)
SP BUTN3
SP BUTN2
RF 5V
RAWB
RAWB SW+B
RAWB
VRF1 2V8
VCO1 EN
SW SENS SW3 1V8
SW3 1V8
VCO1 EN
VCO2 EN
VCO 5V
LTD IN
LTD INB
VCO2 EN
AF MUTE
WDI
DCDC400K
BATTERY SENS
SPEAKER
INT MIC
MIC/SP
JACK
BATTERY
TERMINAL
BEEP
EXT PTT
: TX LINE
: RX LINE
: COMMON LINE
VOL
BATT TYPE
FUSE
F1001
3.15A
1
2
3
BER CLK
CHANNEL SWITCH
S1004
ATT1 CNTL ATT2 CNTL
AF OUT
REF IN
RXACQ
DMCS
SSI RX SSI RX
SSI TX SSI TX
SP IOSP IO
AGC FLAG
SW3 1V8
VRF2 2V8
DIG 3V3
SW1 1V2
VAN 3V3
DIG 1V2
VMLAN 1V8
VRF1 2V8
VMLAN 3V3
RF 5V
BP 3V6
SW SENS
AGC FLAG
VDD 14V
V MULT 1/2
MIC IN
ATT2 CNTL
BATTERY SENS
BATT TYPE
VOL
DVFS
DVFS
DCDC400K
SC
SCL
RESET
RESET
WDI
WDI
BER CLK
EXT PTT
RF IC RESET
BEEP
AF MUTE
MIC SEL
MIC SEL
LOCK DETECT
RX ACQ
CARRIER DETECT
CONTROL
CONTROL
EMA D0-D15
DDR D0-D15
DDR A0-13, BA0-1
DMCS
ATT1 CNTL
ATT0 CNTL
SDA
SDA
ATT2 CNTL
ATT1 CNTL
RX EN
TX BF EN
CLONE
CLONE
TX APC EN
TX LAMP
TX ANT EN
TX RFø1
HP MOD
ACPUMP
MCPUMP
VCO INø2
ATT
Q1039
SKY12338
BALUN
TCXO
X1001
19.2 MHz
LAMP KEY
S1003
INVERTER
Q1043
NL27WZU04
MONI KEY
S1001
BUFF AMP
Q1042
SN74AUC
SWITCH
Q1045
SN74AVC
PTT KEY
S1002
LED-G SW
Q1049
RUM002N02
NAND FLASH
Q1052
(512M BIT)
MT29F1G16BBDAH4
W948BD6FBHX5I
DDR ROM
Q1051
(128M BITE)
LED
D1023
FSL-1615055GR
LED-R SW
Q1046
RUM002N02
DC BOOST
VCO1
Q1030
2SC5010
BUFF AMP
Q1035
2SC5010
SWITCH
Q1057
2SC4617
VCO2
Q1028
2SC5010
VCV DET
Q1036
2SK880GR
VCV DET
JTAG TMS, JTAG TCK
JTAG TRST, JTAG TDI
JTAG TGO, JTAG EMU1
JTAG EMU0, JTAG RTCK
UART2 TXD, UART2 RXD
BOOT1/3, BOOT2, BOOT7
S1
S2

EVX-261 UHF Digital/Analog Transceiver Service Manual 7
Circuit Description
1. Receiver System
1-1. Front-end RFAmplifier
Incoming RF signal from the antenna passes through the
low-pass filter and the antenna switching diode D1004/
D1005 (both 1SS390), then reduce the RF signal to the
optimal level to the next stage by the digital attenuator
Q1054 (SKY12338).
The attenuated RF signal passes through the band-pass
filter and amplifier Q1022 (2SC5006), then remove the
undesired frequencies by the another band-pass filter.
The filtered RF signal is applied to the custom IC Q1044
(RODINIA) through the another digital attenuator Q1039
(SKY12338).
1-2. Demodulator
The custom IC Q1044 (RODINIA) converts a Base Band
signal by mixing the RF signal with the local signal, and
then the Base Band signal is demodulated by the another
section of the custom IC Q1044 (RODINIA).
The local signal is generated by the VCO which consists
of Q1028 (2SC5010) and varactor diodes D1012/D1013
(both 1SV279) or consists of Q1030 (2SC5010) and
varactor diodes D1016/D1017 (both 1SV279). The selec-
tion of the VCO (Q1028 or Q1030) is determined by the
receiving frequency.
1-3. Audio Amplifier
The demodulated signal is adjusted the audio volume
level in the custom IC Q1044 (RODINIA). The adjusted
the audio signal is applied to the audio amplifier Q1027
(TDA2822G) through the buffer amplifier Q1025
(NJM12904V). As a result, the audio signal provides up
to 700 mW (@16-ohm BTL) for internal speaker or up to
500 mW (@4-ohm OTL) for external speaker.
2. Transmitter System
2-1. MIC Amplifier & Modulator
The speech signal from internal microphone MC1001 or
external microphone J1003 is supplied to the custom IC
Q1044 (RODINIA), which modulates the speech signal to
the FM or digital signal.
2-2. Drive & Final Amplifier Stages
The modulated signal from the custom IC Q1044 (RO-
DINIA) is buffered by Q1026 (2SK3077) and amplified by
driver amplifier Q1020 (RQA0004PXDQS). The low lev-
el transmit signal is then applied to Q1012 (RQA0011DNS)
for final amplification up to 5 watts output power.
The transmit signal then passes through the antenna
switch D1002 (RN142S) and is low-pass filtered to sup-
press away harmonic spurious radiation before delivery to
the antenna.
2-3. Automatic Transmit Power Control
The current detector Q1006-1 (AD8566ARM) detects
the current of the final amplifier Q1012 (RQA0011DNS)
and the driver amplifier Q1020 (RQA0004PXDQS), and
converts the current difference to the voltage difference.
The output from the current detector Q1006-1
(AD8566ARM) is compared with the reference voltage
and amplified by the power control amplifier Q1006-2
(AD8566ARM).
The output from the power control amplifier Q1006-2
(AD8566ARM) controls the gate bias of the driver ampli-
fier Q1020 (RQA0004PXDQS) and the final amplifier
Q1020 (RQA0004PXDQS).
The reference voltage changes into two values (Transmit
Power High and Low) controlled by custom IC Q1044
(RODINIA).
3. PLL Frequency Synthesizer
The frequency synthesizer consists of VCO, TCXO
X1001, and the custom IC Q1044 (RODINIA).
The output frequency from TCXO X1001 is 19.2 MHz
and the tolerance is ±1.5 ppm in the temperature range
–22 °F to +140 °F (–30 °C to +60 °C).
3-1. VCO (Voltage Controlled Oscillator)
The VCO Q1028 or Q1030 (both 2SC5006) gener-
ates a between 806-970 MHz (Type “G6”), or 900-1040
MHz (Type “G7”). The selection of the VCO (Q1028 or
Q1030) is determined by the receiving or transmitting
frequency. The output from VCO (Q1028 or Q1030) is
amplified by buffer amplifier Q1035 (2SC5010) and then
is supplied to the custom IC Q1044 (RODINIA).
The VCO frequency is divided into two by the dividing
section of the custom IC Q1044 (RODINIA) in order to
become a true receiving or transmitting frequency.
In the reception, the RF signal convert a Base Band signal
by mixing with the divided VCO signal, and then supplied
to the demodulator section of the custom IC Q1044 (RO-
DINIA), described previously.
In the transmission, the divide VCO frequency is modu-
lated to the FM (or digital) in the custom IC Q1044 (RO-
DINIA), and then is supplied to the transmitter section
described previously.
3-2. Varactor Control Voltage
The tuning voltage (VCV) of the VCO establishes the
lock range of VCO by controlling the cathode of varactor
diode D1012, D1013, D1014and D1015 (all 1SV279)
for VCO Q1028, (or D1016, D1017, D1018 and D1019
(all 1SV279) for VCO Q1030), from the custom IC
Q1044 (RODINIA).
: Type “G6” only.
3-3. PLL
The main constitution product of the PLL is equipped all
with in the custom IC Q1044 (RODINIA), so that all pro-
cessing regarding the frequency control is performed in
the custom IC Q1044 (RODINIA).

EVX-261 UHF Digital/Analog Transceiver Service Manual 8
Introduction
The EVX-261 is carefully aligned at the factory for the
specified performance across the frequency range speci-
fied for each version. Realignment should therefore not
be necessary except in the event of a component failure,
or altering version type. All component replacement and
service should be performed only by an authorized Vertex
Standard representative, or the warranty policy may be
void.
The following procedures cover the sometimes critical and
tedious adjustments that are not normally required once
the transceiver has left the factory. However, if damage
occurs and some parts subsequently are replaced, realign-
ment may be required. If a sudden problem occurs during
normal operation, it is likely due to component failure;
realignment should not be done until after the faulty com-
ponent has been replaced.
We recommend that servicing be performed only by au-
thorized Vertex Standard service technicians who are ex-
perienced with the circuitry and fully equipped for repair
and alignment. Therefore, 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 circuits and make complete
performance checks to ensure compliance with factory
specifications after replacing any faulty components.
Those who do undertake any of 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. Also, Vertex Standard
reserves the right to change circuits and alignment pro-
cedures in the interest of improved performance, without
notifying owners.
Under no circumstances should any alignment be attempt-
ed unless the normal function and operation of the trans-
ceiver are clearly understood, the cause of the malfunction
has been clearly pinpointed and any faulty components
replaced, and realignment determined to be absolutely
necessary.
The following test equipment (and thorough familiarity
with its correct use) is necessary for complete realign-
ment. Correction of problems caused by misalignment
resulting from use of improper 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 complex adjust-
ments be performed afterwards. Do not attempt to perform
only a single 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 presented.
Required Test Equipment
Frequency Counter with 0.2 ppm accuracy at 600
MHz
Deviation Meter (linear detector)
50 Ohm RF Dummy Load with power rating 10 W at
600 MHz
UHF Sampling Coupler
In-line Wattmeter with 5 % accuracy at 600 MHz
Regulated DC Power Supply (standard 7.5 V DC, 3 A)
IBM®PC/compatible Computer with Microsoft® Win-
dows®Vista, 7, 8, 8.1, or Windows 10
Vertex Standard CE156 PC Programming Software
Vertex Standard FIF-12 USB Programming Interface
and CT-104A, CT-106, or CT-171 PC Programming
Cable.
Vertex Standard FRB-6 Tuning Interface Box and CT-
160 Connection Cable.
Vertex Standard CN-3 (P/N: A08760001) Antenna
Connector
Alignment Preparation & Precautions
A 50-Ohm RF Dummy Load and in-line wattmeter must
be connected to the main antenna jack in all procedures
that call for transmission, except where specified other-
wise. Correct alignment is not possible with an antenna.
Because of the BTL (Bridged Trans Less) Amplifier cir-
cuit used in the EVX-261, do not connect earth side of the
speaker leads to chassis “ground”.
After completing one step, read the following step to de-
termine whether the same test equipment will be required.
If not, remove 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 68 and
86 °F (20 ~ 30 °C). When the transceiver is brought into
the shop from hot or cold air, it should be allowed time to
come to room temperature before alignment.
Whenever possible, alignments should be made with os-
cillator 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 the alignment pro-
cedure are based on 0 dBμEMF = 1 μV.
Alignment

EVX-261 UHF Digital/Analog Transceiver Service Manual 9
Test Setup
Setup the test equipment as shown below for transceiver
alignment, then apply 7.5 V DC power to the transceiver.
The Alignment Tool Outline
Installation of the alignment tool
Install the CE156 (PC Programming Software) to your
PC and execute the CE156.
Click the “Alignment” in the “Radio” menu tab of
CE156 to open the “Alignment” window.
Action of the switches
When the transceiver is in the “Alignment mode,“ the ac-
tion of the SIDE-1, SIDE-2, and PTT keys are ignored.
All of the action is controlled 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.
Alignment
Alignment Mode
In the “Alignment Mode”, the aligned data written in the
radio will be able to re-align its alignment data. The value
of each parameter can be changed to desired position by
“”/“” arrow key for data up/down, “”/“” arrow key
for channel up/down, direct number input, and drag the
mouse.
Note: when all items are aligned, it is strongly recom-
mended to align according to following order. The detail
information is written in the help document of CE156 PC
Programming Software.
1. PLL Reference Frequency (Frequency)
2. TX Power <High/Low>
3. Maximum Deviation <Wide/Narrow>
Adjust the following items when needed.
Symbol Deviation
CTCSS Deviation <Wide/Narrow>
DCS Deviation <Wide/Narrow>
DTMF Deviation
MSK Deviation
Sequential Tone Deviation
Inline
Wattmeter
50-ohm
Dummy Load RF Signal
Generator
AF Signal
Generator
SINAD Meter
Power Supply
7.5 VDC Computer
(CE156)
FRB-6
Deviation
Meter
Frequency
Counter
Transceiver
MIC/SP
D-Sub 15-pin
Connector MIC IN
SP OUT B
CT-160
SP/LOAD Switch: LOAD
LOAD Switch: 16W
Battery Terminal CLONE Port CT-104A, CT-106, or CT-171
ANT
Sampling
Coupler
FIF-12
Oscilloscope


EVX-261 UHF Digital/Analog Transceiver Service Manual 10
2. TX POWER
This parameter is to align the “High Power” and “Low1 Power” for the selected channel.
1. Click the “TX Power (High Pwr / Low Pwr)” button to
open the “TX Power Alignment” window.
2. Click the “PTT” button on the desired channel. The ra-
dio starts to transmit on the selected channel.
3. Set the value to get desired output power (High: 5 W,
Low: 1 W) on the Power Meter according to the follow-
ing ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“000” - “3FF”) in the “Current
Data” box from the computer’s keyboard
4. After getting the desired output power, click the “PTT”
button or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the TX Power alignment
and save the data.
You may select the adjusting type from the “Radio” button
(ADJ Type) located at the bottom of the screen, as needed.
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.
Alignment
1. PLL REFERENCE FREQUENCY (FREQUENCY)
This parameter is to align the reference frequency for PLL.
1. Click the “Frequency” button to open the “Frequency
Alignment” window.
2. Click the “PTT” button or press the “SPACE” bar of the
computer’s keyboard, the radio will start to transmit on
the center frequency channel.
3. Set the value to get the desired frequency according to
the following ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“0000” - “FFFF”) in the “Current
Data” box from the computer’s keyboard
4. After getting the desired frequency, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the frequency alignment
and save the data.



EVX-261 UHF Digital/Analog Transceiver Service Manual 11
3. MAXIMUM DEVIATION <WIDE> / <NARROW>
This parameter is to align the “Maximum Deviation” (Wide/Narrow).
1. Press the “Max Dev (W/N)” button to open the “Max
Deviation Alignment” window.
2. Click the “PTT” button on the desired channel. The ra-
dio starts to transmit on the selected channel.
3. Set the value to get desired deviation (Wide: 4.2 kHz,
Narrow: 2.1 kHz) on the deviation meter according to
the following ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the up-down key of the computer’s key-
board

Entering the value (“0000” - “FFFF”) in the entry
box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the Max Deviation
alignment and save the data.
1) You may align the deviation level by any modulation
frequency (default: 1000 Hz) by changing the value of
the “Freq” box located at the bottom left of the screen, if
needed.
2) You may select the alignment type from the “Radio”
button (ADJ Type) located at the bottom of the screen,
as needed.
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.
Alignment


EVX-261 UHF Digital/Analog Transceiver Service Manual 12
Perform the following alignments as needed.
SYMBOL DEVIATION
This parameter is to align the deviation of the digital mode artificially.
1. Press the “Symbol Dev” button to open the “Symbol
Deviation Alignment” window.
2. Click the “PTT” button on the desired channel. The ra-
dio starts to transmit on the selected channel.
3. Set the value to get Target Deviation (which is indicated
on the screen) on the deviation meter according to the
following ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the up-down key of the computer’s key-
board

Entering the value (“0000” - “FFFF”) in the entry
box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the Symbol Deviation
alignment and save the data.
You may select the alignment type from the “Radio” button
(ADJ Type) located at the bottom of the screen, as needed.
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.
Alignment


EVX-261 UHF Digital/Analog Transceiver Service Manual 13
CTCSS DEVIATION <WIDE> / <NARROW>
This parameter is to align CTCSS Deviation of the selected channel.
1. Press the “CTCSS (W/N)” button to open the “CTCSS
Deviation Alignment” window.
2. Click the “PTT” button or press the “SPACE” bar of the
computer’s keyboard to transmit the radio.
3. Set the value to get desired deviation (Nominal: Wide:
0.55 kHz, Narrow: 0.35 kHz) on the deviation meter ac-
cording to the following ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“–20.00” - “20.00”) in the “Cur-
rent Data” box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the CTCSS Deviation
alignment and save the data.
You may align the deviation level by any CTCSS tone fre-
quency (default: 300.0 Hz) by changing the value of the
“CTCSS Freq” box located at the bottom of the screen, if
needed.
Alignment

DCS DEVIATION <WIDE> / <NARROW>
This parameter is to align “DCS Deviation” of the selected channel.
1. Press the “DCS (W/N)” button to open the “DCS Devia-
tion Alignment” window.
2. Click the “PTT” button or press the “SPACE” bar of the
computer’s keyboard to transmit the radio.
3. Set the value to get desired deviation (Nominal: Wide: 0.6
kHz, Narrow: 0.4 kHz) on the deviation meter according
to the following ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“–20.00” - “20.00”) in the “Cur-
rent Data” box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the DCS Deviation
alignment and save the data.
You may align the deviation level by any DCS code (default:
532) by changing the value of the “DCS Code” box located
at the bottom of the screen, if needed.


EVX-261 UHF Digital/Analog Transceiver Service Manual 14
MSK DEVIATION
This parameter is to align “MSK Deviation” which use for the ANI operation of the MDC1200 System.
1. Press the “MSK” button to open the “MSK Deviation
Alignment” window.
2. Click the “PTT” button or press the “SPACE” bar of the
computer’s keyboard to transmit the radio.
3. Set the value to get desired deviation (Nominal: 3.0
kHz) on the deviation meter according to the following
ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“–20.00” - “20.00”) in the “Cur-
rent Data” box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the MSK Deviation
alignment and save the data.
DTMF DEVIATION
This parameter is to align “DTMF Deviation”.
1. Press the “DTMF” button to open the “DTMF Deviation
Alignment” window.
2. Click the “PTT” button or press the “SPACE” bar of the
computer’s keyboard to transmit the radio.
3. Set the value to get desired deviation (Nominal: 3.0
kHz) on the deviation meter according to the following
ways:

Dragging the slide bar

Clicking the arrow (/)buttons

Pressing the left/right arrow key of the computer’s
keyboard

Entering the value (“–20.00” - “20.00”) in the “Cur-
rent Data” box from the computer’s keyboard
4. After getting the desired deviation, click the “PTT” but-
ton or press the “SPACE” bar to stop transmitting.
5. Click the “OK” button to finish the DTMF Deviation
alignment and save the data.
You may align the deviation level by any DTMF tone (de-
fault: “0”, available selection: “0” - “9”, “A” - “D”, “E(*)”,
and “F(#)”) by changing the value of the “DTMF Code”
box located at the bottom of the screen, if needed.
Alignment



EVX-261 UHF Digital/Analog Transceiver Service Manual 15

Alignment
SEQUENTIAL TONE DEVIATION
This parameter is to fine-tune of the “Sequential Tone Deviation” for the 2-Tone and 5-Tone Encoder.
1. Press the “Seq Tone” button to open the “Sequential
Tone DeviationAlignment” window.
2. Entering the desired value in the “New” box from the
computer’s keyboard.
3. Click the “OK” button to finish the Sequential Tone De-
viation alignment and save the data.
DOWNLOAD (SAVE) THE ALIGNMENT DATA AND EXIT FROM THE ALIGNMENT MODE
Press the “OK” button, then the Alignment Data will be
downloaded (saved) to the transceiver and Exit from the
Alignment Mode.


EVX-261 UHF Digital/Analog Transceiver Service Manual 16
Cloning
The EVX-261 transceiver includes a convenient “Cloning” feature, which allows the programming data from one trans-
ceiver to be transferred to another EVX-261. Here is the procedure for Cloning one transceiver’s data to another.
1. Turn both transceivers “off”.
2. Remove the plastic cap and its two mounting screws
from the MIC/SP jack on the right side of the trans-
ceiver. Do this for both transceivers.
3. Connect the optional
CT-27 cloning cable between the
MIC/SP jacks of the two transceivers.
4. Press and hold in the PTT and SIDE-1 switches (just
below the PTT switch) while turning the transceiver
“on” (the order of the switch-on operation does not
matter). When Clone mode is successfully activated in
this step.
5. On the Destination transceiver, press the SIDE-1
switch. The LED indicator on the top of the transceiv-
er will glow Green.
6. Press the
PTT switch on the Source transceiver. The
LED indicator on the top of the transceiver will glow
Red, and the data will be transferred.
7. If there is a problem during the cloning process, the
LED indicator on the top of the transceiver will blink
Red; check your cable connections and battery volt-
age, and try again.
8. If the data transfer is successful, the LED indicator on
the top of the transceiver will turn off. Turn both trans-
ceivers “off” and disconnect the CT-27 cable. You can
then turn the transceivers back on, and begin normal
operation.
9. Replace the plastic cap and its two mounting screws.
CT-27 Optional Cloning Cable
PTT Switch 
SIDE-1 Switch 
PTT Switch 
SIDE-1 Switch 

Main Unit (FR028100D)
EVX-261 UHF Digital/Analog Transceiver Service Manual 17
Circuit Diagram (RF Section)
TYPE "G6"
403-470 MHz
K22178293
6p
K22178288
1.5p
K22178295
8p
K22179729
2.5p
K22174211
10p
K22174211
10p
K22174213
12p
---
K22178295
8p
K22148834
0.01
---
K22178292
5p
K22178287
1p
K22178293
6p
K22178294
7p
K22179729
2.5p
K22178300
15p
G2070618
1SV279
G2070618
1SV279
G2070618
1SV279
G2070618
1SV279
L1691595
0.0016u
L1690518
0.015u
J24185221
220
J24189522
8.2k
J24189009
47
---
---
J24189487
1k
J24189487
1k
---
J24189070
0
---
μ
---
TYPE "G7"
450-520 MHz
K22178292
5p
K22178287
1p
K22178293
6p
K22178288
1.5p
K22174209
8p
---
---
K22174219
22p
K22178293
6p
K22178240
150p
K22179709
47p
K22178291
4p
K22178285
0.5p
K22178292
5p
K22178292
5p
K22178289
2p
K22178297
10p
---
---
---
---
L1691720
0.0036u
L1690520
0.022u
J24185331
330
---
J24189005
22
J24189489
10k
J24189489
10k
---
---
J24189070
0
---
J24189523
18k
K22148834
0.01μ
C1
013
C1
018
C1022
C1023
C1038
C1044
C1048
C1055
C1068
C1078
C1083
C1120
C1153
C1154
C1159
C1163
C1414
C1438
D1012
D1013
D1016
D1019
L 1017
L 1021
R 1105
R 1138
R 1139
R 1346
R 1347
R 1350
R 1351
R 1355
R 1356
R 1374

Main Unit (FR028100D)
EVX-261 UHF Digital/Analog Transceiver Service Manual 18
Circuit Diagram (CONTROL Section)

EVX-261 UHF Digital/Analog Transceiver Service Manual 17
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mission of Vertex Standard LMR, Inc.
Vertex Standard is a trademark of Vertex Standard LMR, Inc.
All other trademarks are the property of their respective owners.
©2016 Vertex Standard LMR, Inc.
All rights reserved.