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28

VX-450 Series UHF Band Service Manual

When the detection voltage is low, the CPU makes

Q3049

 ON with making 90 pin “H” and the AF sig-

nal is output.

2-5-2. Carrier Squelch

The CPU (14 pin: A/D port) detect RSSI voltage out-
put from 

Q3033

 12 pin, and controls AF output.

The RSSI output voltage changes according to the
signal strength of carrier. The stronger signal makes
the RSSI voltage to be higher voltage.
The process of the AF signal control is same as Noise
Squelch.
The shipping data is adjusted –1dBu (EMF) higher
than squelch tight sensitivity.

3. Transmitter System

3-1. MIC Amplifier

The AF signal from internal microphone 

MC2001

(Non key Type: 

MC3001

) or external microphone

J3004

 in to Audio processor IC 

Q3013

 (selected 33

pin or 34 pin). 

Q3013

 is which contains the micro-

phone amplifier, compandor, Pre-emphasis, limiter
and splatter filter, the processed signal to made FM
modulation to transmit carrier by the modulator

D3014

 (

HVC383B

) of VCO.

Q3013

 is built-in DTMF Receiver, and Inversion Type

Encryption.

3-2. Drive and Final Amplifier Stages

The modulated signal from the VCO 

Q3023

(

2SC4227

) is buffered by 

Q3017

 (

2SC5005

). Then

the signal is buffered by 

Q3010

 (

2SC3356

) for the

final amplifier driver 

Q3015

 (

RQA0004PXDQS

). The

low-level transmit signal is then applied to 

Q3006

(

RQA0011DNS

) for final amplification up to 5 watts

output power.
The transmit signal then passes through the antenna
switch 

D3005

 (

HVU131

) and is low pass filtered to

suppress away harmonic spurious radiation before
delivery to the antenna.

3-3. Automatic Transmit Power Control

The current detector 

Q3040-1

 (

NJM12904V

) detects

the current of 

Q3006

 and 

Q3008

, and converts the

current difference to the voltage difference.
The output from the current detector 

Q3040-1

 is com-

pared with the reference voltage and amplified by
the power control amplifier 

Q3040-2

.

The output from 

Q3040-2

 controls the gate bias of

the final amplifiers 

Q3006

 and the final amplifier

driver 

Q3008

.

The reference voltage changes into four values
(Transmit Power High and Low) controlled by 

Q3040

(

NJM12904V

).

4. PLL Frequency Synthesizer

The frequency synthesizer consists of PLL IC, 

Q3036

(

AK1541

), VCO, TCXO (X3001).

The output frequency from TCXO is 16.8 MHz and
the tolerance is ±2.5 ppm (in the temperature range
–30 to +60 degrees).

4-1. VCO (Voltage-Controlled Oscillator)

While the radio is receiving, the RX oscillator 

Q3019

(

2SK508

) in VCO generates a programmed fre-

quency between 282.35 and 322.35 MHz (Version “I”)
or 249.15 and 289.15 MHz (Version “K”) as 1st local
signal.
While the radio is transmitting, the TX oscillator

Q3023

 (

2SC4227

) in VCO generates a frequency be-

tween 350 and 390 MHz (Version “I”) or 300 and 340
MHz (Version “K”).
The output from oscillator is amplified by buffer
amplifier 

Q3017

 (

2SC5005

) and becomes output of

VCO. The output from VCO is divided, one is am-
plified by 

Q3022

 and feed back to the PLL IC 17 pin.

The other is amplified in 

Q3014

 and in case of the

reception, it is put into the mixer as the 1st local sig-
nal through 

D3011

, in transmission, it is buffered

Q3010

, and more amplified in 

Q3008

 and it is put

into the final amplifier 

Q3006

.

4-2. VCV (Varactor Control Voltage) Control

Tuning voltage of VCO is expanding the lock range
of VCO by controlling the cathode of varactor diode
at the voltage and the control voltage from PLL IC.

Circuit Description (Version I & K)

Содержание VX-450 series

Страница 1: ...lignment Mode menu 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 inconsis tencies in the technical information would be appreciated Important Note This transceiver is assembled using Pb lead free solder based on the RoH...

Страница 2: ... 4 3 x 2 3 x 1 5 inches 109 x 58 5 x 37 mm VX 454 459 with FNB V133LI UNI 4 3 x 2 3 x 1 8 inches 109 x 58 5 x 45 mm VX 454 459 with FNB V134LI UNI Weight Approx 10 4 oz 296 g VX 451 with FNB V112LI Antenna Belt Clip 12 0 oz 340 g VX 451 with FNB V113LI Antenna Belt Clip 9 9 oz 281 g VX 451 with FNB V133LI UNI Antenna Belt Clip 11 6 oz 330 g VX 451 with FNB V134LI UNI Antenna Belt Clip 11 4 oz 322 ...

Страница 3: ...rox 296 g VX 451 with FNB V112LI Antenna Belt Clip 340 g VX 451 with FNB V113LI Antenna Belt Clip 322 g VX 454 459 with FNB V112LI Antenna Belt Clip 366 g VX 454 459 with FNB V113LI Antenna Belt Clip 281 g VX 451 with FNB V133LI UNI Antenna Belt Clip 330 g VX 451 with FNB V134LI UNI Antenna Belt Clip 307 g VX 454 459 with FNB V133LI UNI Antenna Belt Clip 356 g VX 454 459 with FNB V134LI UNI Antenn...

Страница 4: ...lable only as part of a desig nated assembly SP Connector Mating Operation 1 Insert the cable side first 2 Press down at the lever side NOTE Horizontal mating could damage the connector SP Connector Unmating Operation 1 Hook the lever 2 Pull up friction lock is released 3 Positive lock is released and removal completes Friction lock Positive lock Please remove the speaker connector from DISPLAY Un...

Страница 5: ...Insert the cable side first 2 Press down at the lever side NOTE Horizontal mating could damage the connector SP Connector Unmating Operation 1 Hook the lever 2 Pull up friction lock is released 3 Positive lock is released and removal completes Friction lock Positive lock Please remove the speaker connector from DISPLAY Unit when you remove a FRONT Case of the transceiver RA1405100 O RING CAP RA140...

Страница 6: ...ERSION K 16 KEY 4 KEY CP9819008 VERSION D NON KEY CP9819009 VERSION A NON KEY CP9819010 VERSION I NON KEY CP9819011 VERSION K NON KEY MIC SP CAP ASSY CB6642000 KNOB VOL RA125100B 1 KNOB FREQ RA125110B 1 HOLDER LCD RA1243200 16 KEY 4 KEY 1 LIGHT GUIDE LCD RA1243300 16 KEY 4 KEY 1 INTER CONNECTOR RA124340A 16 KEY 4 KEY 1 SPONGE RUBBER LCD RA1243500 16 KEY 4 KEY 1 REFLECTOR SHEET RA1243700 16 KEY 4 K...

Страница 7: ... XTAL FILTER MFT67P 67 650MHZ H1102471 1 B d3 MAIN 2 UNIT VERSION I K CD3001 CERAMIC DISC ECDA450C24 H7901460 1 B c3 CF3001 CERAMIC FILTER LTWC450F H3900563 1 B a3 CF3002 CERAMIC FILTER LTWC450H H3900584 1 B b3 F 3001 CHIP FUSE 3 15A FHC16 322ADTP Q0000118 1 A B2 J 3008 CONNECTOR DF57H 2P 1 2V 21 P0091595 NON KEY 1 A B1 MC3001 MIC ELEMENT PF0 1055P M3290045 NON KEY 1 A C1 Q 3006 FET RQA0011DNS G0 ...

Страница 8: ...8 VX 450 Series UHF Band Service Manual Block Diagram Version A D 16 key 4 key Type RF Section ...

Страница 9: ...9 VX 450 Series UHF Band Service Manual Block Diagram Version A D 16 key 4 key Type Frequency Generation Reguration Section ...

Страница 10: ...10 VX 450 Series UHF Band Service Manual Block Diagram Version A D 16 key 4 key Type AF Section ...

Страница 11: ...11 VX 450 Series UHF Band Service Manual Block Diagram Version A D 16 key 4 key Type Controller Section ...

Страница 12: ...12 VX 450 Series UHF Band Service Manual Block Diagram Version A D Non key Type RF Section ...

Страница 13: ...13 VX 450 Series UHF Band Service Manual Block Diagram Version A D Non key Type Frequency Generation Reguration Section ...

Страница 14: ...14 VX 450 Series UHF Band Service Manual Block Diagram Version A D Non key Type AF Section ...

Страница 15: ...15 VX 450 Series UHF Band Service Manual Block Diagram Version A D Non key Type Controller Section ...

Страница 16: ...16 VX 450 Series UHF Band Service Manual Block Diagram Version I K 16 key 4 key Type RF Section ...

Страница 17: ...17 VX 450 Series UHF Band Service Manual Block Diagram Version I K 16 key 4 key Type Frequency Generation Reguration Section ...

Страница 18: ...18 VX 450 Series UHF Band Service Manual Block Diagram Version I K 16 key 4 key Type AF Section ...

Страница 19: ...19 VX 450 Series UHF Band Service Manual Block Diagram Version I K 16 key 4 key Type Controller Section ...

Страница 20: ...20 VX 450 Series UHF Band Service Manual Block Diagram Version I K Non key Type RF Section ...

Страница 21: ...21 VX 450 Series UHF Band Service Manual Block Diagram Version I K Non key Type Frequency Generation Reguration Section ...

Страница 22: ...22 VX 450 Series UHF Band Service Manual Block Diagram Version I K Non key Type AF Section ...

Страница 23: ...23 VX 450 Series UHF Band Service Manual Block Diagram Version I K Non key Type Controller Section ...

Страница 24: ...ns the second mixer second local oscillator limiter ampli fier noise amplifier and RSSI amplifier The signal from reference oscillator X1001 becomes 4 times of frequencies in Q1033 it is mixed with the IF signal and becomes 450 kHz The second IF then passes through the ceramic filter CF1001 or CF1002 to strip away unwanted mixer products and is applied to the limiter amplifier in Q1033 which remov...

Страница 25: ...cy as the output of reference divider These two signals are compared by phase detector the phase difference pulse is gen erated Circuit Description Version A D 2 5 2 Carrier Squelch The CPU 14 pin A D port detect RSSI voltage out put from Q1033 12 pin and controls AF output The RSSI output voltage changes according to the signal strength of carrier The stronger signal makes the RSSI voltage to be ...

Страница 26: ...locked by the control of this DC voltage The PLL serial data from CPU is sent with three lines of SDO 40 pin SCK 36 pin and PSTB 30 pin The lock condition of PLL is output from the UL 18 pin terminal and UL becomes H at the time of the lock condition and becomes L at the time of the unlocked condition The CPU always watches over the UL condition and when it becomes L unlocked condition the CPU pro...

Страница 27: ...econd mixer second local oscillator limiter ampli fier noise amplifier and RSSI amplifier Circuit Description Version I K The signal from reference oscillator X3001 becomes 4 times of frequencies in Q3033 it is mixed with the IF signal and becomes 450 kHz The second IF then passes through the ceramic filter CF3001 or CF3002 to strip away unwanted mixer products and is applied to the limiter amplif...

Страница 28: ... detector Q3040 1 NJM12904V detects the current of Q3006 and Q3008 and converts the current difference to the voltage difference The output from the current detector Q3040 1 is com pared with the reference voltage and amplified by the power control amplifier Q3040 2 The output from Q3040 2 controls the gate bias of the final amplifiers Q3006 and the final amplifier driver Q3008 The reference volta...

Страница 29: ...etector the phase difference pulse is gen erated The phase difference pulse and the pulse from through the charge pumps and LPF It becomes the DC voltage to control the VCO The oscillation frequency of VCO is locked by the control of this DC voltage The PLL serial data from CPU is sent with three lines of SDO 40 pin SCK 36 pin and PSTB 30 pin The lock condition of PLL is output from the UL 18 pin ...

Страница 30: ...dard reserves the right to change circuits and alignment procedures in the interest of improved performance without notifying 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 realignment determined to be ab...

Страница 31: ...gnments 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 the alignment procedure are based on 0 dBμ EMF 1 μV Test Setup Setup the test equipment as shown below for trans ceiver alignment apply 7 5 V DC power to the trans ceiver The Alignment Tool Outline In...

Страница 32: ...lch 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 LTR Deviation Battery To enter the Alignment Mode select Alignment in the main Radio menu It will start to Upload the alignment data from the radio t...

Страница 33: ...gn ment 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 drag ging 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...

Страница 34: ... Up Down arrow key to switch to the se lected channel 3 Set the Signal Generator according to the indica tion 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 5 Click the OK button to finish the RX Sensitivity alignment and sav...

Страница 35: ...he Alignment for the level 15 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 Sig nal Generator according to the indi...

Страница 36: ...transmit on the selected channel 4 Set the value to get desired output power High 5 W Low3 2 5 W Low2 1 W Low1 250 mW on the Power Meter by dragging the slide bar click ing the up down button pressing the left or right arrow key or entering the value in the entry box on the selected channel 5 After getting the desired output power click the PTT button or press the SPACE bar to stop transmitting 6 ...

Страница 37: ...he de sired channel 5 Click the PTT button or press the SPACE bar the radio starts to transmit on the selected chan nel 6 Set the value to get desired deviation Wide 4 2kHz Narrow 2 1kHz on the deviation meter 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 on the selected channel 7 After getting the desired deviatio...

Страница 38: ...e bar or press the Up Down arrow key to select the de sired channel 5 Click the PTT button or press the SPACE bar the radio starts to transmit on the selected chan nel 6 Set the value to get the best square wave on the Oscilloscope by dragging the slide bar clicking the up down button pressing the left or right ar row key or entering the value in the entry box on the selected channel 7 After getti...

Страница 39: ...n the selected channel 4 Set the value to get desired deviation on the de viation meter by dragging the slide bar clicking the up down button pressing the left or right ar row key or entering the value in the entry box on the selected channel 5 After getting the desired deviation Wide 0 6 kHz Narrow 0 3 kHz click the PTT button or press SPACE bar to stop transmitting 6 Click the OK button to finis...

Страница 40: ...on the selected channel 4 Set the value to get desired deviation Wide 0 6 kHz Narrow 0 3 kHz on the deviation meter 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 on the selected channel 5 After getting the desired deviation click PTT button or press SPACE bar to stop transmitting 6 Click the OK button to finish the...

Страница 41: ...top trans mitting 5 Click the OK button to finish the DTMF Devia tion alignment and save the data SEQUENTIAL TONE DEVIATION This parameter is to align Sequential Tone Deviation 1 Press the Seq Tone button to start the alignment The Sequential Tone Deviation Alignment win dow will appear 2 Click the PTT button or press the SPACE bar the radio starts to transmit on the Center fre quency channel 3 Se...

Страница 42: ...nment value in the New box Default 80 Input Range 0 Level Down 255 Level Up 3 Click the OK button the data will be saved and the alignment is complete TX MSK LEVEL This parameter is to align the modulation level of the ANI function 1 Press the TX MSK button to start the alignment The TX MSK Level window will appear 2 Then input the alignment value in the New box Default 9 Input Range 0 Level Down ...

Страница 43: ...ick the OK button the data will be saved and the alignment is complete 4 Set the value of the DC Power source to 7 5V ac cording to the indication LTR DEVIATION This parameter is to align the LTR Deviation This parameter does not appear when adjusting the transceiver which is not installed the LTR feature 1 Press the LTR Dev button to start the alignment The LTR Deviation window will appear 2 Then...

Страница 44: ...44 VX 450 Series UHF Band Service Manual MAIN Unit Circuit Diagram Version A D 16 key 4 key Type Lot 1 4 ...

Страница 45: ...45 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 1 4 Side A 1 3 2 4 A B C D E F G ...

Страница 46: ...46 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 1 4 Side B a b c d e f g 1 3 2 4 ...

Страница 47: ...47 VX 450 Series UHF Band Service Manual MAIN Unit Circuit Diagram Version A D 16 key 4 key Type Lot 5 6 ...

Страница 48: ...48 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 5 6 Side A 1 3 2 4 A B C D E F G ...

Страница 49: ...49 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 5 6 Side B a b c d e f g 1 3 2 4 ...

Страница 50: ...50 VX 450 Series UHF Band Service Manual MAIN Unit Circuit Diagram Version A D 16 key 4 key Type Lot 7 ...

Страница 51: ...51 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 7 Side A 1 3 2 4 A B C D E F G ...

Страница 52: ...52 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D 16 key 4 key Type Lot 7 Side B a b c d e f g 1 3 2 4 ...

Страница 53: ...53 VX 450 Series UHF Band Service Manual MAIN Unit Circuit Diagram Version A D Non key Type Lot 1 7 ...

Страница 54: ...54 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D Non key Type Lot 1 7 Side A 1 3 2 4 A B C D E F G ...

Страница 55: ...55 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D Non key Type Lot 1 7 Side B a b c d e f g 1 3 2 4 ...

Страница 56: ...56 VX 450 Series UHF Band Service Manual MAIN Unit Circuit Diagram Version A D Non key Type Lot 8 ...

Страница 57: ...57 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D Non key Type Lot 8 Side A 1 3 2 4 A B C D E F G ...

Страница 58: ...58 VX 450 Series UHF Band Service Manual MAIN Unit Parts Layout Version A D Non key Type Lot 8 Side B a b c d e f g 1 3 2 4 ...

Страница 59: ...59 VX 450 Series UHF Band I Band Service Manual MAIN 2 Unit Circuit Diagram Version I K 16 key 4 key Type ...

Страница 60: ...60 VX 450 Series UHF Band I Band Service Manual MAIN 2 Unit Parts Layout Version I K 16 key 4 key Type Side A A B C D E F G 1 3 2 4 ...

Страница 61: ...61 VX 450 Series UHF Band I Band Service Manual a b MAIN 2 Unit Parts Layout Version I K 16 key 4 key Type Side B c d e f g 1 3 2 4 ...

Страница 62: ...62 VX 450 Series UHF Band I Band Service Manual MAIN 2 Unit Circuit Diagram Version I K Non key Type ...

Страница 63: ...63 VX 450 Series UHF Band I Band Service Manual MAIN 2 Unit Parts Layout Version I K Non key Type Side A A B C D E F G 1 3 2 4 ...

Страница 64: ...64 VX 450 Series UHF Band I Band Service Manual a b Side B c d e f g 1 3 2 4 MAIN 2 Unit Parts Layout Version I K Non key Type ...

Страница 65: ...65 VX 450 Series UHF Band Service Manual DISPLAY Unit Circuit Diagram 16 key 4 key Type Lot 1 4 ...

Страница 66: ...66 VX 450 Series UHF Band Service Manual DISPLAY Unit Parts Layout 16 key 4 key Type Lot 1 4 Side A A B C D E 1 3 2 4 ...

Страница 67: ...67 VX 450 Series UHF Band Service Manual DISPLAY Unit Parts Layout 16 key 4 key Type Lot 1 4 Side B a b c d e 1 3 2 4 ...

Страница 68: ...68 VX 450 Series UHF Band Service Manual DISPLAY Unit Circuit Diagram 16 key 4 key Type Lot 5 Circuit Diagram ...

Страница 69: ...69 VX 450 Series UHF Band Service Manual DISPLAY Unit Parts Layout 16 key 4 key Type Lot 5 Side A A B C D E 1 3 2 4 ...

Страница 70: ...70 VX 450 Series UHF Band Service Manual DISPLAY Unit Parts Layout 16 key 4 key Type Lot 5 Side B a b c d e 1 3 2 4 ...

Страница 71: ...f this manual may be reproduced without the permission 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 2015 Vertex Standard LMR Inc All rights reserved ...

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