Vertex Standard VX-6000V User manual

Introduction
This manual provides technical information neces-
sary for servicing the VX-6000V VHF FM Transceiver.
Servicing this equipment requires expertise in han-
dling surface-mount chip components. Attempts by
non-qualified persons to service this equipment may
result in permanent damage not covered by the war-
ranty, 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 referred to by the type of the majority of components installed 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 leaded components only.
While we believe the technical 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.
VHF FM Transceiver
VX-6000V
Service Manual
Specifications .............................................. 1-1
DSUB 25-Pin Accessory Connector ............ 2-1
Cloning ......................................................... 3-1
Exploded View & Miscellaneous Parts.. 4-1
MAIN Unit Modifications ....................... 4-2
Parts List ...................................................... 5-1
Block Diagram ............................................ 6-1
Interconnection Diagram.......................... 7-1
Circuit Description ................................... 8-1
Alignment .................................................... 9-1
Contents
Board Unit ( Schematics & Layouts )
MAIN Unit (FR006760C/D) ........................... 10A-1
DISPLAY Unit (FR004690D) .......................... 10B-1
KEY Unit (FR006070D) ................................... 10C-1
VR Unit (FR006080C) ..................................... 10D-1
MIC CONN Unit (FR006090C) ...................... 10E-1
MIC CONN-2 Unit (FR017700A) ................... 10F-1
PA Unit (FR006770C/D) ................................. 10G-1
PA-2 Unit (FR025710B) .................................. 10H-1
Optional Board Unit ( Schematics & Layouts )
F2D-8 2-Tone Decode Unit ............................ 11A-1
VTP-50 VX-Trunk Unit ................................... 11B-1
FVP-25 Encryption / DTMF Pager Unit ....... 11C-1
F5D-14 5-Tone Unit......................................... 11D-1
FIF-7 Connection Unit ..................................... 11E-1
Important Note
After Lot. 22 of 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 appara-
tus. 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.
POWER
Vertex Standard LMR, Inc.
©2015 Vertex Standard LMR, Inc.
EC024N90J

Specifications
GENERAL
Frequency Range: 148 - 174 MHz
Number of Channels: 250 channels
Channel Spacing: 12.5 / 25 kHz
Power Supply Voltage: 13.4V DC ±15 %
Current Consumption: Standby: 600 mA
Receive: 2.2 A
Transmit: 28 A (High)
Ambient Temperature Range: –22 °F to +140 °F (–30 °C to +60 °C)
Frequency Stability: Better than ±2 ppm
RF Input-Output Impedance: 50 Ohms
Audio Output Impedance: 4 Ohms
Dimensions: 7” (w) x 2.4” (H)x 11.9” (D) (178 x 60 x 301 mm)
Weight (Approx.): 15.4 lbs. (7.0 kg)
RECEIVER (Measurements made per EIA standard TIA/EIA-603)
Circuit Type: Double-conversion Super-heterodyne
Sensitivity (EIA 12 dB SINAD): 0.25 μV
Adjacent Channel Selectivity: 85/80 dB
Intermodulation: 80/75 dB
Spurious and Image Rejection: 90 dB
Audio Output: 5 W @ 4 Ohms w/3 % THD
10 W @ 4 Ohms w/3 % THD (Optional MLS-100)
TRANSMITTER (Measurements made per EIA standard TIA/EIA-603)
Power Output: 110 / 50 W
Modulation: 16K0F3E, 11K0F3E
Max Deviation: 5.0/2.5 kHz
Conducted Spurious Emissions: 80 dB Below Carrier
Audio Distortion (@ 1 kHz): < 2 %
Measurements per EIA standards unless noted above.
Specifications subject to change without notice or obligation.
1-1VX-6000 VHF Service Manual

2-1VX-6000 VHF Service Manual
DSUB 25-Pin Accessory Connector
Pin 1: RSSI [Analog Output]
A DC voltage proportional to the strength of the
signal currently being received (Receiver Signal
Strength Indicator) is provided on this pin. This
low impedance output is generated by the receiver
IF sub-system and buffered by an internal op-
amp. Typical voltages are graphed as follows:
DSUB25 output level (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1259 398 125 398 12.5 4 1.25 0.4 0.125 0.04
SSG Input Level (uV)
DSUB 25-Pin Numbering
Pin 2, 3, 4, 5 & 6: SELECT, DSUB 03, DSUB 04, DSUB
05 & DSUB 06
[Digital Input Port]
These input port features can be programmed via
the CE49 programmer. The same item can not be
chosen twice.
To select the “Input port” page, (Common 
DSUB-25 Input port).
LOGIC level (+5V / 0V) input (Low active).
High Impedance input.
None
MON This feature is the same as pressing
and holding in the Monitor key.
DIMMER LCD illumination dimmer “on.”
Hook Activates the Hook1 feature.
SCAN Activates the scanner.
G-SCAN Activates the Group scanner.
RPT INH Disables the repeater feature during
Multi Deck operation.
EMG Activates the Emergency feature.
Home Switches to the Home Channel.
CH SW0 Memory channel recall
(Channel Switch Table bit 0)
CH SW1 Memory channel recall
(Channel Switch Table bit 1)
CH SW2 Memory channel recall
(Channel Switch Table bit 2)
CH SW3 Memory channel recall
(Channel Switch Table bit 3)
Example
If you assign “CH SW0” and “CH SW1” to the
Universal Input Port, you can recall Channels 1~3
as shown below.
Channel CH SW0 CH SW1
110
201
311
Pin 2
Pin 4
Pin 6
Pin 3
Pin 5

2-2VX-6000 VHF Service Manual
DSUB 25-Pin Accessory Connector
Similarly, if you assign “CH SW0,” “CH SW1,”
and “CH SW2” to the Universal Input Port, you
can recall Channels 1~7 as shown below:
The Memory Channel is determined via the CE49
Programmer. (Common DSUB-25pin connec-
tor Channel switch Table).
If you need to recall all memory channels (15 CH)
from the External Controller via the Uni-versal
Input Port, you should assign the “All Channel
Recall” Command (CH SW 0 ~ CH SW 3) to the
Universal Input Port.
In this case:
Sample Circuit
Pin 7: E [GND]
Ground for all logic levels and power supply re-
turn.
Pin 8: A KEY OUT [Universal Output Port]
Open collector output. Output voltage 0 ~ 5 V,
Max. sink current 30 mA.
The possible programming features (use CE49)
are illustrated below.
A PORT/B PORT/C PORT/D PORT/E PORT/
None
Refer to the “Pins 20, 21, & 22” section for details.
Pin 9: TXD [Digital Output for Alignment software]
Connect to the RS232C cable (requires FIF-8 and
CT-88)
Pin 10: RXD [Digital Input for Alignment software]
Connect to the RS232C cable (requires FIF-8 and
CT-88)
Pin 11: EXT PTT
Shorting this port to ground causes the transceiver
to be placed in the Transmit mode, while open-
ing the connection to this port returns the trans-
ceiver to the Receive mode.
Pin 12: MIC MUTE
MIC mute on: Level High (5V)
MIC mute off: Open
LOGIC level (+5V / 0V) output.
When the PTT/EXT PTT switch is pressed, this
pin switches to “open.”
Channel CH SW0 CH SW1 CH SW2
1100
2010
3110
4001
5101
6011
7111
Channel CH SW0 CH SW1 CH SW2 CH SW3
11000
20100
31100
40010
51010
60110
71110
80001
91001
100101
111101
120011
131011
140111
151111
PINS 2, 3, 4, 6
DSUB25-Pi
n
PIN 5(Pull Up)
47k

5V
DSUB25-Pin

2-3VX-6000 VHF Service Manual
DSUB 25-Pin Accessory Connector
Pin 13: TXDI [Digital Input for DATA Communications]
TX Hi-speed Data Input Type (jumper JP2005).
Input level 800 mV/600 Ohms, Max.input 1.2V
Tx Low-speed Data input Type (Jumper
JP2006). Input level 40 mV/600-Ohms
If the Jumper setting is “Low-speed Data” (JP2006
jumpered), this port is usable in the AUDIO
(300~3000 Hz) range.
If the jumper setting is “HI-speed Data” (JP2005
jumpered), this port is usable for 9600 bps DATA
communications, because the filter and limiter are
not engaged in the Audio line.
Pin 14: DC OUT [13.4 V/5 V DC Output]
Switched 13.8V output for supplying power to
an accessory (jumper JP2008).
Switched and regulated DC 5.0V output for
supplying power to an accessory (jumper
JP2007).
Maximum output current is 200 mA
Pin 15: IGN [Ignition Sense feature]
Connecting this line to the ignition sense line of
the vehicle will automatically turn the radio on
when the vehicle's ignition key is turned on.
Pin 16: NC [NO connection]
Pin 17: RX DO [Digital Output for DATA Communications]
RX Hi-speed Data Output Type (jumper
JP2003). output level 600 mV/10k Ohms
RX Low-speed Data Output Type (jumper
JP2004). output level 200 mV/600 Ohms
If the Jumper setting is “Low-speed Data” (JP2004
jumpered), this port is usable in the AUDIO
(300~3000 Hz) range.
If the jumper setting is “HI-speed Data” (JP2003
jumpered), this port is usable for 9600 bps DATA
communications, because the filter and limiter are
not engaged in the Audio line.
Pin 18: E [GND]
Ground for all logic levels and power supply re-
turn.
Pins 19, 20, 21, & 22: DSUB 19, DSUB 20, DSUB 21
and DSUB 22
[Universal Output Port]
LOGIC level (+5V / 0V) output.
The logic output appears at these pins when the
front panel's PF key is turned on.
The possible programming features (use CE49)
are illustrated below.
If the HA feature is assigned to these ports, a cur-
rent amplifier must be connected between the
Horn circuit and the port.
None/A PORT/B PORT/C PORT/D PORT/E
PORT/HA PORT
Pin 23: EXT SQL [Squelch Signal Output]
Open collector output. Max. sink current 10 mA.
A Signal is present (Squelch is open): Level High
No Signal is present (Squelch is closed): Open
When you connect the solder jumper on J2002,
this port changes to PULL UP (5 V) output.
This status can be changed by CE49 programmer.
Pin 24: SP MUTE [Speaker Mute Output]
Open collector output.
External Speaker mute on: Level High
External Speaker mute off: Open
Pin 25: E [GND]
Chassis ground.

3-1VX-6000 VHF Service Manual
POWER
Cloning
The VX-6000 includes a convenient “Clone” feature,
which allows the programming data from one trans-
ceiver to be transferred to another VX-6000. Here is
the procedure for Cloning one radio’s data to anoth-
er.
Note: When a cloning isn't made, you correct the fol-
lowing part using “CE49."
When a “Radio to Radio Clone" which is in the
“Miscellaneous" menu is “Disabled," change this
menu to “Enabled."
1. Turn both transceivers off.
2. Remove the plastic cap and its two mounting
screws from the MIC/SP jack on the transceiver.
Do this for both transceivers.
3. Connect the optional CT-72 cloning cable be-
tween the MIC/SP jacks of the two transceivers.
4. On the Destination transceiver, press and hold
the PF Button (just below the POWER Button)
while turning the transceiver on.
5. Now, on the Source transceiver, press and hold
the Button while turning the transceiver
on.Data will now be transferred to the Destina-
tion transceiver from the Source transceiver.
6. If there is a problem during the cloning process,
sound an error beep from source the transceiver.
Check your cable connections and battery volt-
age, and try again.
7. If cloning is a successful, turn the Destination
transceiver off. Now turn the Source transceiver
off.
8. Disconnect the CT-72. Replace the plastic cap
and its two mounting screws.
9. You can then turn the transceivers back on, and
begin normal operation.
Dealer Programming of VTP-50 and F5D-14
These procedures are designed to be used by the installing technician after the VTP-50 and F5D-14 has
been installed in the transceiver. To program a VX-6000’s VTP-50 and F5D-14 board, you will need the
CT-71 programming interface cable, the CE26 Programming diskette, and an IBM PC/AT or PS/2-com-
patible type computer.
To enter the Programming mode, use the follow-
ing procedure:
1. Turn the transceiver off.
2. Turn on the transceiver while holding in the
PF Button (just below the Button).
Optional Cloning Cable
CT-72
Destination Source
POWERPOWER

4-1VX-6000 VHF Service Manual
Exploded View & Miscellaneous Parts
Non-designated parts are available only as part of a designated assembly.
RA02543B0
KNOB R6054387B
SPECIAL NUT
RA037890B
PANELASSY
RA091340A
RUBBER PACKING
RA0253900
RUBBER KNOB (CH)
CB1668001
KEY Unit (FR006070D)
RA0254000
RUBBER KNOB (PWR)
RA0275500
RUBBER KNOBASSY
R0145680
FITTING (x4 pcs)
M4090241
SPEAKER
CB1669001
VR Unit (FR006080C)
RA0253000
LCD HOLDER
G6090140A
LCD
RA0252800
DIFFUSER SHEET
RA0252300
LIGHT GUIDE
DISPLAY Unit (FR004690D)
CB1667001
RA0252700
REFLECTOR SHEET
RA020830A
DOUBLE FACE (Both Side)
RA025480A
CONTACT ASSY (Both Side)
RA0215400
SHEET
RA0215000
EXT CAP


MAIN Unit (FR006760C/D)
CB1512001
T9207215
WIRE ASSY
RA102330A
CASE
RA0262300
HOLDER PLATE
RA0252900
RUBBER CONNECTOR
R0134490A
HOLDER
RA032710A
CHASSIS
S6000395
COVER P-25P(23)






















RA02543C0
KNOB


P1091245
CONNECTOR
P1090654A
CONNECTOR
Supplied with VR3601*
VR3601*








RA033290A
SHILD COVER



RA033300C
HEATSINK PLATE








S6000396
RUBBER GROMMET TM-96-17
RA0384100
SPONGE RUBBER (IC)
DC
C
FE
B
A
F
E
B
D
11
11

A

12
12
12
PA Unit (FR006770C/D)
CB7074000
PA-2 Unit (FR025710B)
T9206975
WIRE ASSY
U9900216
SPECIAL NUT
Accessories
Description VXSTD P/N Qty.
DC CABLE 04P 40AX2 T9023140 1
KNOB CAP RA0254100 5
NAME PLATE RA0254700 1
1
MIC CONN Unit (FR006090C)
CB4294001
MIC CONN-2 Unit (FR017700A)
1
2
2
22
1: MIC CONN Unit is not available.
2: These screws are not required
in the MIC CONN-2 Unit.
3: PA Unit is not available.
3
1
Screw List
REF. VXSTD P/N Description Qty.
1U20306007 BINDING HEAD SCREW M3x6B 7
2U20306002 BINDING HEAD SCREW M3x6NI 6
3U24308002 TAPTITE SCREW M3x8NI 17 (w/MIC CONN Unit)
13 (w/MIC CONN-2 Unit)
4U23206001 TAPTITE SCREW M2.6x6 14
5U20305007 BINDING HEAD SCREW M3x5B 2
6U32450007 FLAT HEAD SCREW M2.6x5B 2
7U31306007 OVAL HEAD SCREW M3x6B 2
8U20308002 BINDING HEAD SCREW M3x8NI 2
9U02308002 SEMS SCREW SM3x8NI 4
10 U24208001 TAPTITE SCREW M2.6x8 1
11 S5000182 SCREW JFS-4S-B1MW 2
12 U04306002 SEMS SCREW HSM3x6NI 3
MIC CONN Unit (FR006090C)
CB4294001
MIC CONN-2 Unit (FR017700A)

4-2VX-6000 VHF Service Manual
MAIN Unit Modifications
The PA Unit have been discontinued. Therefore, the PA Unit is not possible to order as the repair parts, and
replaced with the PA-2 Unit.
When replacing the PA Unit to PA-2 Unit, you must be modified the MAIN Unit as following.
Delete the Gusket (RA0530900). This part is no longer needed.
Delete the Shield Cover (RA0124501). This part is no longer needed.
Replace the Power Module IC (G1094314 G1095439: RA30H1317M1A-122).
Add the Chip Resistor (J24205102) between Pin 1 and Pin 2 of Q1017 (Power Module IC).
Add the Jumper wire (T51508002) between the Pin 8 of J1001 and Pin 8 of Q1007.

Delete the Gusket

Delete the Shield Cover

RA30H1317M1A-122
(P/N: G1095439)
Replace the Power Module IC

Add the Chip Resistor
1 k-ohm, 1/10 W
(P/N: J24205102)

Add the Jumper Wire
AWG28, 80 mm
(P/N: T51508002)

5-1
Parts List
Printed Circuit Board with Components
MAIN Unit CB1512001
DISPLAY Unit CB1667001
KEY Unit CB1668001
VR Unit CB1669001
MIC CONN-2 Unit CB4294001
PA-2 Unit CB7074000
Mechanical Parts
PANEL ASSY RA037890B
CHASSIS RA032710A
CASE RA102330A
RUBBER PACKING RA091340A
VOL KNOB RA02543C0
CHANNEL KNOB RA02543B0
RUBBER KNOB (PWR) RA0254000
RUBBER KNOB (CH) RA0253900
RUBBER KNOB ASSY RA0275500
SPECIAL NUT (CH) R6054387B
LCD HOLDER RA0253000
LIGHT GUIDE RA0252300
REFLECTOR SHEET RA0252700
RUBBER CONNECTOR RA0252900
DIFFUSER SHEET RA0252800
SEMS SCREW 3 pcs HSM3x6NI U04306002
BINDING HEAD SCREW 2 pcs M3x5B U20305007
BINDING HEAD SCREW 6 pcs M3x6NI U20306002
BINDING HEAD SCREW 7 pcs M3x6B U20306007
SEMS SCREW 4 pcs SM3x8NI U02308002
BINDING HEAD SCREW 2 pcs SM3x8NI U20308002
TAPTITE SCREW 14 pcs M2.6x6 U23206001
TAPTITE SCREW 1 pc M2.6x8 U24208001
TAPTITE SCREW 17 or 13 pcs M3x8NI U24308002
OVAL HEAD SCREW 2 pcs M3x6B U31306007
FLAT HEAD SCREW 2 pcs M2.6x5B U32450007
SCREW 2 pcs JFS-4S-B1WM S5000182
Electrical Parts
SPEAKER 1.5 W/8 A-S0005030-002 M4090241
CONNECTOR MR-S P1091245
MAIN Unit Electrical Parts
CD1001 CERAMIC DISC CDBCB450KCAY24-R0 H7901340 1- B a4
CF1001 CERAMIC FILTER CFWLB450KGFA-B0 H3900435 1- A G5
CF1002 CERAMIC FILTER CFWLB450KE2A-B0 H3900466 1- A G5
CO2001 CERAMIC OSC 1MHz CSBFB1M00J2B021-R1 H7900950 1- A B3
F 2001 CHIP FUSE 0.25A KAB2402-251NA31010 Q0000085 1- A B1
Q 1017 IC RA60H1317M-124 G1094314 For PA Unit 1- A E1
Q 1017 IC RA30H1317M1A-122 G1095439 For PA-2 Unit 1- A E1
Q 2018 TRANSISTOR A7240L-TB7-T G1095431 1- A A3
TC1001 TRIMMER CAP. 10pF TZB4Z100AA10R00 K91000285 1- A E5
TC1002 TRIMMER CAP. 20pF TZB4R200AA10R00 K91000217 1- A D4
TH1001 THERMISTOR TBPS1R103K440H5Q G9090067 1- A G4
TH1002 THERMISTOR TBPS1R103K440H5Q G9090067 1- A G4
VR1001 POT. EVM3YSX50BC5 J51833154 1- A F5
X 1001 XTAL OSC 14.5MHz TTS12V 14.5MHZ H9500630 1- A F5
X 2001 XTAL 92SMX(CN) 16MHz 16.000MHZ H0103322 1- A A4
XF1001 XTAL FILTER 43.95MHz UM-5-3P 43Y12B5F H1102425 1- A F4
XF1002 XTAL FILTER 43.95MHz UM-5-3P 43Y12B5F H1102425 1- A F4
XF1003 XTAL FILTER 43.95MHz 43Y07B5 UM-5-3P H1102486 1- A F4
XF1004 XTAL FILTER 43.95MHz 43Y07B5 UM-5-3P H1102486 1- A F4
VX-6000 VHF Service Manual
DESCRIPTION VALUE V/W TOL. VXSTD P/NMFR’S DESIG VERS. REF. LOT. SIDE LAY ADR

5-2
Parts List
DISPLAY Unit Electrical Parts
DS3002 LCD M762-1 G6090140A 1- A D1
S 3007 TACT SWITCH SKQDAB N5090058 1- A A1
S 3008 TACT SWITCH SKQDAB N5090058 1- A F1
S 3009 TACT SWITCH SKQDAB N5090058 1- A F1
X 3001 XTAL 92SMX(CN) 16MHz 16.000MHZ H0103322 1- B a3
KEY Unit Electrical Parts
MC3401 MIC. ELEMENT EM240T M3290066 1- A
S 3401 TACT SWITCH SKQDAB N5090058 1- A
S 3402 TACT SWITCH SKQDAB N5090058 1- A
S 3403 TACT SWITCH SKQDAB N5090058 1- A
S 3404 TACT SWITCH SKQDAB N5090058 1- A
S 3405 TACT SWITCH SKQDAB N5090058 1- A
VR Unit Electrical Parts
S 3601 ROTARY SWITCH SRZW0L010K N0190177 1- A
VR3601 POT. RK09L1120 L=15 10KC J60800258 1- A
PA-2 Unit Electrical Parts
Q 9001 FET RD70HVF1-101 G3090140 201- A C2
Q 9002 FET RD70HVF1-101 G3090140 201- A C3
RL9001 RELAY DC9V G6Z-1PE-A DC9V M1190220 201- A E3
TH9001 THERMISTOR NTCG164LH104JT1 G9090192 201- A C3
TH9002 THERMISTOR NTCG164BH102JT1 G9090188 201- A D4
VX-6000 VHF Service Manual
DESCRIPTION VALUE V/W TOL. VXSTD P/NMFR’S DESIG VERS. REF. LOT. SIDE LAY ADR

6-1VX-6000 VHF Service Manual
Block Diagram: MAIN Unit & PA Unit (1)

6-2VX-6000 VHF Service Manual
Block Diagram: MAIN Unit & PA Unit (2)

6-3VX-6000 VHF Service Manual
Block Diagram: MAIN Unit & PA-2 Unit

6-4VX-6000 VHF Service Manual
Block Diagram: DISPLAY Unit

7-1VX-6000 VHF Service Manual
Interconnection Diagram

8-1
Circuit Description
VX-6000 VHF Service Manual
Transceiver functions, such as PLL synthesizer
settings and channel programming, are controlled
via the microprocessor unit (MPU). Reception and
transmission are switched by “RX” and “TX” lines,
also controlled from the MPU.
Main Receiver Signal Path
The receiver uses double-conversion superhetero-
dyne circuitry, with a 43.95 MHz 1st IF and 450 kHz
2nd IF. The 1st LO, produced by a PLL synthesizer,
yields the 43.95 MHz 1st IF. The 2nd LO uses a 43.5
MHz (43.95 MHz - 450 kHz) signal generated by a
crystal oscillator. The 2nd mixer and other circuits
use a custom IC to convert and amplify the 2nd IF,
and detect FM to obtain demodulated signals.
Incoming RF signals from the antenna connector
are delivered to the PA Unit or PA-2 Unit.
In the PA Unit, the RF signals pass through a low-
pass filter (LPF) network consisting of coils L6009,
L6008, and L6007, capacitors C6041, C6047, C6040,
C6050, C6039, and C6027, and the antenna switch-
ing relay for delivery to the receiver front end in the
Main Unit.
In the PA-2 Unit, the RF signals pass through a
low-pass filter (LPF) network consisting of coils
L9009, L9008, and L9007, capacitors C9041, C6047,
C9040, C9050, C9039, and C9027, and the antenna
switching relay for delivery to the receiver front end
in the Main Unit.
Signals within the frequency range of the trans-
ceiver are then passed through a varactor-tuned
band-pass filter consisting of L1007 and L1020 be-
fore RF amplification by Q1018 (2SC3356).
The amplified RF is then band-pass filtered again
by varactor-tuned resonators L1009 and L1011 be-
fore and then to ensure pure in-band input to 1st
mixer consisting of trances T1001, FET Q1043
(SPM5001).
Buffered output from the VCO Unit is amplified
by Q1032 (2SC4227) and low-pass filtered by L1041,
L1045 and C1153, C1154 and C1174 to provide a pure
1st local signal between 191.95 and 217.95 MHz for
input to the 1st mixer.
The 43.95 MHz first mixer product then passes
through second RF amplification by Q1030
(2SC3356) and dual monolithic crystal filters XF1001
and XF1002 (7.5 kHz BW) for wide band or XF1003
and XF1004 (3.75 kHz BW) for narrow band, and is
amplified by Q1041 (2SC4226) and delivered to the
input of the FM IF subsystem IC, Q1034
(TA31136FN). This IC contains the 2nd mixer, 2nd
local oscillator, limiter amplifier, FM detector, noise
amplifier, and squelch gate.
The 2nd LO in the IF-IC is produced from TCXO
X1001 (14.500 MHz), and the 1st IF is converted to
450 kHz by the 2nd mixer and stripped of unwanted
components by ceramic filter CF1001 or CF1002. Af-
ter passing through a limiter amplifier, the signal is
demodulated by the FM detector.
Demodulated receive audio from the IF-IC is
amplified by Q1036 (2SA1602A), Q2019
(CXA1846N). After volume adjustment by the AF
power amplifier Q2018 (TDA7240AV), the audio sig-
nal is passed to the speaker jack or the internal 4-
Ohm loudspeaker.
PLL Synthesizer
The 1st LO maintains stability from the PLL syn-
thesizer by using a 14.500 MHz reference signal from
TCXO X1001. PLL synthesizer IC Q1033 (SA7025DK)
consists of a prescaler, reference counter, swallow
counter, programmable counter, a serial data input
port to set these counters based on the external data,
a phase comparator, and charge pump. The PLL-IC
divides the 14.500 MHz reference signal by 725 us-
ing the reference counter (20.0 kHz comparison fre-
quency). The phase detector comparison frequency
is designed to be eight times the channel spacing (2.5
kHz). The VCO output is divided by the prescaler,
swallow counter, and programmable counter. These
two signals are compared by the phase comparator
and sent to the charge pump. A voltage proportion-
al to their phase difference is delivered to the low-
pass filter circuit, then fed back to the VCO as a volt-
age with phase error, controlling and stabilizing the
oscillating frequency. This synthesizer also operates
as a modulator during transmit.
The RX-VCO is composed of Q1019 (2SK520) and
D1010, D1011, D1016, D1018 (all HVU306A), and os-
cillates between 191.95 MHz and 217.95 MHz accord-
ing to the programmed receiving frequency. And the
TX-VCO is composed of Q1020 (2SC5107) and
D1014 and D1015 (bothHVU306A), and oscillates be-
tween 148.0 MHz and 174.0 MHz according to the
programmed transmit frequency. The VCO output
passes through buffer amplifier Q1026 (2SC5107),
and a portion is fed to the buffer amplifier Q1029
(2SC5107) of the PLL IC, and at the same time am-
plified by Q1032 (2SC4227) to obtain stable output.
The VCO DC supply is regulated by Q1006
(2SC4154E). Synthesizer output is fed to the 1st mix-
er by diode switch D1025 (1SS321) during receive,
and to drive amplifier Q1031 (2SC5415E) and Q1025
(2SC2954) for transmit. The reference oscillator feeds
the PLL synthesizer, and is composed of TCXO X1001
(14.500 MHz).

8-2
Circuit Description
VX-6000 VHF Service Manual
Transmitter
During transmit, the PLL synthesizer oscillates at
the desired frequency directly, for amplification to
obtain RF power output. During transmission, voice
modulation and CTCSS (or DCS) modulation are
applied to this synthesizer.
Voice audio from the microphone is amplified by
the microphone amplifier Q3039 (NJM2902V) in the
DISPLAY Unit, and then deliver to the MAIN Unit.
The amplified audio is supplied to Q2001
(NJM2902V) through the amplifier Q2041
(NJM2902V). Q2001consists of the pre-emphasis,
limiter (IDC instantaneous deviation control), and
low-pass filter; the signal is adjusted for optimum
deviation level and delivered to the next stage.
Voice inputs from the microphone and CTCSS are
FM-modulated at the VCO of the synthesizer, while
DCS audio is modulated by the reference frequency
oscillator of the synthesizer.
Synthesizer output, after passing through diode
switch D1025 (1SS321), is amplified by drivers
Q1031 (2SC5415E) and Q1025 (2SC2954) and power
module Q1017 (early model: M67781H, current mod-
el: RA60H1317M for PA Unit or RA30H1317M1A
for PA-2 Unit) to obtain the required RF drive prior
to delivery to the PA Unit or PA-2 Unit.
In the PA Unit, the RF signal is amplified by par-
allel junction transistors Q6001/Q6002 (early model:
both 2SC5125, current model: both 2SC2782A) and
passes through antenna switching relay RL6001 and
a low-pass filter circuit, and ultimately to the anten-
na connector.
RF output power from the final amplifier is sam-
pled by a CM coupler and is rectified by D6002 and
D6003 (both HSM88AS). The resulting DC is fed
through Automatic Power Controller Q1007
(NJM2902V), Q1002 (2SB1143S: early model only)
to control the gain of the transmitter RF amplifier
and thus regulate the power output.
Generation of spurious products by the transmit-
ter is minimized by the fundamental carrier frequen-
cy being equal to the final transmitting frequency,
modulated directly in the transmit VCO. Additional
harmonic suppression is provided by a low-pass fil-
ter consisting of L6007, L6008, L6009, and C6027,
C6039, C6050, C6040, C6047 and C6041, resulting in
more than 65 dB of harmonic suppression prior to
delivery of the RF energy to the antenna.
In the PA-2 Unit, the RF signal is amplified by
parallel junction transistors Q9001/Q9002 (both
RD70HVF1) and passes through antenna switching
relay RL9001 and a low-pass filter circuit, and ulti-
mately to the antenna connector.
RF output power from the final amplifier is sam-
pled by a CM coupler and is rectified by D9002 and
D9003 (both HSM88AS). The resulting DC is fed
through Automatic Power Controller Q1007
(NJM2902V) to control the gain of the transmitter
RF amplifier and thus regulate the power output.
Generation of spurious products by the transmit-
ter is minimized by the fundamental carrier frequen-
cy being equal to the final transmitting frequency,
modulated directly in the transmit VCO. Additional
harmonic suppression is provided by a low-pass fil-
ter consisting of L9007, L9008, L9009, and C9027,
C9039, C9050, C9040, C9047 and C9041, resulting in
more than 65 dB of harmonic suppression prior to
delivery of the RF energy to the antenna.
DCS Demodulator
DCS signals are demodulated on the MAIN-
UNIT, and are applied to low-pass filter Q2040
(NJM2902V), as well as the limiter comparator Q2040
(NJM2902V).
CTCSS Encoder/Decoder
The CTCSS code is generated and encoded by
MPU IC Q2025 (MB90F583B). Demodulation and
detection of the CTCSS tones are carried out by IC
Q2017 (MX165C).
MPU
Operation is controlled by 16-bit MPU IC Q2025
(MB90F583B). The system clock uses a 16.000 MHz
crystal for a time base. IC Q2035 (RN5VL35AA) re-
sets the MPU when the power is on, and monitors
the voltage of the regulated 5V power supply line.
EEPROM
The EEPROM retains Tx and Rx data for all mem-
ory channels, as well as CTCSS data, DCS data, pres-
caler dividing, and REF oscillator data (internal/ex-
ternal).

9-1
Alignment
VX-6000 VHF Service Manual
The VX-6000 has been carefully aligned at the fac-
tory for the specified performance across the frequen-
cy range specified for each version.
Realignment should therefore not be necessary
except in the event of a component failure, or when
altering the transceiver version. If a sudden prob-
lem occurs during normal operation, it is likely due
to component failure; realignment should not be
done until after the faulty component has been re-
placed. All component replacement and service
should be performed only by an authorized
VERTEX STANDARD representative, or the warran-
ty policy may be voided. Therefore, if a fault is sus-
pected, contact the dealer from whom the transceiv-
er was purchased for instructions regarding repair.
Authorized VERTEX STANDARD service tech-
nicians realign all circuits and make complete per-
formance checks to ensure compliance 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 re-
alignment are not covered by the warranty policy.
Also, VERTEX STANDARD must reserve the right
to change circuits and alignment procedures in the
interest of improved performance, without notify-
ing owners.
Under no circumstances should any alignment be
attempted 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.
Required Test Equipment
The following test equipment (and thorough fa-
miliarity with its correct use) is necessary for com-
plete realignment. Correction of problems caused by
misalignment resulting from use of improper test
equipment is not covered under the warranty poli-
cy.
While most steps do not require all of the equip-
ment listed, the interactions of some adjustments
may require that more complex adjustments be per-
formed 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 sec-
tion in the order presented.
RF signal generator: calibrated output level at 1000
MHz
Deviation Meter (linear detector)
AF Millivoltmeter
SINAD Meter
Inline Wattmeter with 5% accuracy at 1000 MHz
Regulated DC Power Supply: adjustable from 10
to 17 VDC, 35A
50-ohm non-reactive Dummy Load: 200 W at 1000
MHz
Frequency Counter: <0.1 ppm accuracy at 1000
MHz
AF Signal Generator
DC Voltmeter: high impedance
RF Sampling Coupler (attenuation pad)
Oscilloscope
Spectrum Analyzer
Vertex Standard SVC49 channel programming
editor.
IBM®PC/Compatible computer with Microsoft®
Windows®2000, XP, Vista or 7.
Vertex Standard FIF-12 USB Programming Inter-
face and T9101628 Connection Cable.
Vertex Standard FRB-6 Tuning Interface Box and
CT-161 Programming Cable.
Alignment Preparation & Precautions
A dummy load and inline wattmeter must be con-
nected to the main antenna jack in all procedures
that call for transmission, except where specified oth-
erwise. Correct alignment is not possible with an
antenna. After completing one step, read the follow-
ing step to determine whether the same test equip-
ment will be required. If not, remove the test equip-
ment (except dummy load and wattmeter, if connect-
ed) before proceeding.
Correct alignment requires that the ambient tem-
perature 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 some time for thermal
equalization with the environment before alignment.
If possible, alignments should be made with oscilla-
tor shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly warmed
up before beginning.

9-2
Alignment
VX-6000 VHF Service Manual
PLL & Transmitter
Set up the test equipment as shown for transmit-
ter alignment.
Maintain the supply voltage at 13.4 V DC for all
steps.
PLL VCV
Connect the positive lead of the DC voltmeter to
test point TP1008 (VCV) on the Main Unit, as in-
dicated in the figure, and connect the negative lead
to chassis ground.
Set the transceiver to the low band edge frequency
channel (CH1 or CH4), then adjust TC1001 on the
Main Unit for 1.6 V ± 0.1 V on the voltmeter.
Key the transmitter, and adjust TC1002 on the
Main Unit for 1.85 V ±0.1 V on the voltmeter.
Next select to the high edge frequency channel
(CH3 or CH6) and confirm the VCV is less than
7.0 V on the voltmeter.
Key the transmitter, and confirm the VCV is less
than 7.0 V on the voltmeter.
Before beginning, connect the transceiver and PC
using the FIF-12 USB Programming Interface and
T9101628 Connection Cable, then download the EE-
PROM data from the transceiver to the computer.
Store this data in a disk file so that it can be saved
and retrieved later. Using the table below, program
the channel, CTCSS, and DCS alignment settings for
your transceiver version. Upload this file to the trans-
ceiver.
Note:Signal levels in dB referred to in this proce-
dure are based on 0 dBμ= 0.5 μV (closed cir-
cuit).
Alignment Channel Frequencies
Channel Frequency CTCSS DCS Narrow/Wide
(simplex) Encode Encode
CH1 148.01 MHz None None Wide
CH2 161.01 MHz None None Wide
CH3 173.99 MHz None None Wide
CH4 148.01 MHz None None Narrow
CH5 161.01 MHz None None Narrow
CH6 173.99 MHz None None Narrow
CH7 161.01 MHz 151.4 Hz None Wide
CH8 161.01 MHz None 023 Wide
CH9 161.01 MHz 151.4 Hz None Narrow
CH10 161.01 MHz None 023 Narrow
Inline
Wattmeter
50-ohm
Dummy Load AF Signal Generator
Power Supply
13.4 VDC
Computer
(SVC49)
FRB-6
Deviation
Meter
Frequency
Counter
Microphone Jack
D-Sub 15-pin
Connector MIC IN
CT-161
DC INPUT
T9101628
ANT
Sampling Coupler
FIF-12
D-Sub 25-pin
Connector
TRANSMITTER ALIGNMENT SETUP

9-3
Alignment
VX-6000 VHF Service Manual
Transmitter Output Power
The following transmitter parameters can be ad-
justed from the computer by utilizing the Alignment
Software. Refer to the onboard help of the Alignment
Software Manual for details.
Select the band center frequency channel (CH2 or
CH5), and select the “high” power output level.
Key the transmitter and adjust “TX PWR Hi” for a
power output of 110 Watts (± 3.0 W) as indicated
on the wattmeter.
Stay on the band center frequency channel (CH2
or CH5), and select the “low” power output level.
Key the transmitter and adjust “TX PWR L3“ for a
power level of 50 Watts (± 2.0 W) as indicated on
the wattmeter.
Transmitter Deviation
The following modulation parameters can be ad-
justed from the computer by utilizing the Alignment
Software. Refer to the onboard help of the Alignment
Software Manual for details.
Microphone Audio Modulation Level
Select the band center frequency channel (CH2),
and select the “low” power output level.
Adjust the AF generator for 50mV (–30dBm) out-
put at 1 kHz, as applied to the microphone jack.
Key the transmitter and adjust “MAX Dev (wide)”
for maxi-mum deviation of 4.2 kHz ± 0.2 kHz as
indicated on the deviation meter.
Select the band center frequency channel (CH5),
and select the “low” power output level.
Adjustdjust the AF generator for 50mV (–30dBm)
output at 1 kHz, as applied to the microphone jack.
Key the transmitter and adjust “MAX Dev (Nar-
row)” for maxi-mum deviation of 2.1 kHz ± 0.1
kHz as indicated on the deviation meter.
TP1008TC1001TC1002