Vertex VX-210AV Service manual
VX-210AV
VHF Band
Service Manual
©2003 VERTEX STANDARD CO., LTD. Printed in Japan.
EC020N90A
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
International Division
8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
Introduction
The Vertex VX-210AV is a compact hand portable transceiver for the VHF land mobile band that offers the convenience of small size, light weight, and simple operation.
The VX-210AV can be simply programmed by your
VERTEX STANDARD Dealer with up to 16 channels for
single and split frequency operation. The VX-210AV provides up to 5 watts of RF output power and includes a
flexible quick-connect antenna.
The transceiver and Ni-Cd battery packs are constructed of thick high-impact polycarbonate plastic, with special attention paid by the designers to tight seals and ruggedness, assuring years of reliable operation even in harsh
environments.
The following pages describe the operation, features
and accessories of the VX-210AV. With proper care and
operation, the transceiver will provide many years of reliable communications.
Contents
Operating Manual Reprint................................................................................................................................................2
Specifications.......................................................................................................................................................................5
Cloning..................................................................................................................................................................................6
Exploded View & Miscellaneous Parts...........................................................................................................................7
Block Diagram .....................................................................................................................................................................8
Circuit Description .............................................................................................................................................................9
Alignment...........................................................................................................................................................................11
Board Units (Schematics, Layouts & Parts)
MAIN Unit .....................................................................................................................................................................13
SW Unit ..........................................................................................................................................................................31
Optional Board Units (Schematics, Layouts & Parts)
VTP-50 VX-Trunk Unit.................................................................................................................................................32
FVP-25 Encryption / DTMF Pager Unit .....................................................................................................................34
1
Operating Manual Reprint
VOL
7
1
5
Contorols & Connectors
LED Indicator
Glows Green ACC on
Blinking Green Busy Channel (or SQL off)
Glows Red Transmitting
Blinking Red Battery Voltage is low
Blinking Yellow Receiving a Selective Call
Antenna
Push To Talk
(
PTT) Switch
ACC Button
Battery Pack
Latch
CH (Channel) Selector
VOL/PWR Knob
MIC/SP Jack
(
External Mic/Earphone
Speaker
Microphone
Before You Begin
Battery Pack Installation and Removal
r To install the battery, hold the transceiver with your
left hand, so your palm is over the speaker and your
thumb is on the top of the belt clip. Insert the battery
pack into the battery compartment on the back of the
radio while tilting the Belt Clip outward, then close
the Battery Pack Latch until it locks in place with a
“Click.”
Low Battery Indication
r As the battery discharges during use, the voltage gradually
becomes lower. When the battery voltage reaches 6.3 volts,
substitute a freshly charged battery and recharge the depleted pack. The TX/BUSY indicator on the top of the radio
will blink red when the battery voltage is low.
r Avoid recharging Ni-Cd batteries often with little use
between charges, as this can degrade the charge capacity. We recommend that you carry an extra, fullycharged pack with you so the operational battery may
)
be used until depletion (this “deep cycling” technique
promotes better long-term battery capacity).
Operation
Preliminary Steps
r Install a charged battery pack onto the transceiver, as
described previously.
r Screw the supplied antenna onto the Antenna jack.
Never attempt to operate this transceiver without an
antenna connected.
r If you have a Speaker/Microphone, we recommend that
it not be connected until you are familiar with the basic operation of the VX-210A.
Operation Quick Start
r Turn the top panel’s VOL/
PWR knob clockwise to
turn on the radio on.
r Pull and turn the top
panel’s CH selector knob
to choose the desired operating channel.
1
1
9
CH
1
3
3
1
r To remove the battery, turn the radio off and remove
any protective cases. Open the Battery Pack latch on
the bottom of the radio, then slide the battery downward and out from the radio while holding the Belt
Clip.
Caution!
Do not attempt to open any of the rechargeable NiCd packs, as they could explode if accidentally shortcircuited.
2
r Rotate the VOL/PWR knob
to set the volume level. If no
signal is present, press and
hold in the ACC button (the
lower button on the left
side) for more than 1 second
(when “MONITOR” is assigned to the ACC button); background noise will now be heard, and you may use this to
set the VOL/PWR knob for the desired audio level.
r Press and hold in the ACC
button (when “MONITOR” is assigned to the
ACC button) for more
than 1 second (or press the
ACC button twice) to
quiet the noise and resume normal (quiet) monitoring.
Operating Manual Reprint
r To transmit, press and hold
in the PTT switch. Speak
into the microphone area
of the front panel grille
(lower left-hand corner) in
a normal voice level. To return to the Receive mode, release the PTT switch.
r If a Speaker/Microphone is available, remove the plas-
tic cap and its two mounting screws from the right side
of the transceiver, then insert the plug from the
Speaker/Microphone into the MIC/SP jack; secure the
plug using the screws supplied with the Speaker/Microphone. Hold the speaker grille up next to your ear
while receiving. To transmit, press the PTT switch on
the Speaker/Microphone, just as you would on the
main transceiver’s body.
Note:
Save the original plastic cap and its mounting screws.
They should be re-installed when not using the
Speaker/Microphone.
Key Functions
The VX-210A provides a programmable “ACC” (Accessory)
button. The ACC button’s functions can be customized (set to
any of a variety of functions), via programming by your VER-
TEX STANDARD dealer, to meet your communications/network requirements. The particular function to be activated or
disabled may require a simple press of the ACC button, or it
may require that the ACC button be pressed and held in for one
second (or more). See the discussion below.
Some features may require the purchase and installation of
optional internal accessories.
The possible ACC button programming features are illustrated
below, and their functions are explained in the next chapter.
For further details, contact your VERTEX STANDARD dealer.
For future reference, check the box next to the function that
has been assigned to the ACC button on your particular radio,
and keep it handy.
Function
None
Monitor
Squelch OFF
Low Power
Scan
Follow-me Scan
Dual Watch
Talk Around
Call/Reset
Speed Dial
TX Save Off
ACC 1
ACC 2
ACC button
Press Press and Hold
Description of Operating Functions
Monitor
Press the ACC button to override (disable) the Tone Squelch.
Background noise or incoming signals will now be
heard whether or not a matching tone is present on
the signal. Press the ACC button once more to resume
normal (quiet) Tone Squelch action.
Squelch OFF
Press the ACC button to override both the Noise and
Tone squelch systems. Again press the ACC button to
resume normal (quiet) Noise and Tone squelch action.
Low Power
Press the ACC button to set the radio's transmitter to
the “Low Power” mode, thus extending battery life.
Press the ACC button again to return to “High Power”
operation when in difficult terrain.
Scan
The Scanning feature is used to monitor multiple channels programmed into the transceiver. While scanning,
the radio will check each channel for the presence of a
signal, and will stop on a channel if a signal is present.
r To activate scanning:
Press the ACC button.
The scanner will search the channels, looking for
“active” ones; it will pause each time it finds a channel on which someone is speaking.
r To stop scanning:
Press the ACC button.
Operation will revert to the channel to which the
CH knob is set.
Follow-Me Scan
“Follow-Me” Scan feature checks a User-assigned Priority Channel regularly as you scan the other channels.
Thus, if only Channels 1, 3, and 5 (of the 8 available
channels) are designated for “Scanning,” the user may
nonetheless assign Channel as the “User-assigned” Priority Channel via the “Follow-Me” feature.
Press the ACC button to activate “Follow-Me” scanning,
then pull and turn the CH selector knob to the channel
which you want to designate as the “User-Assigned Priority Channel”. When the scanner stops on an “active”
channel, the User-assigned Priority Channel will automatically be checked every few seconds.
Dual Watch
The Dual Watch feature is similar to the Scan feature,
except that only two channels are monitored: the current operating channel, and the “Priority” channel.
r To activate Dual Watch:
Press the ACC button.
The scanner will search the two channels; it will
pause each time it finds a channel on which someone is speaking.
3
Operating Manual Reprint
To stop Dual Watch:
Press the ACC button.
Operation will revert to the channel to which the
CH knob is set.
Talk Around
Press the ACC button to activate the Talk Around feature when you are operating on duplex channel systems (separate receive and transmit frequencies, utilizing a “repeater” station). The Talk Around feature
allows you to bypass the repeater station and talk directly to a station that is nearby. This feature has no
effect when you are operating on “Simplex” channels,
where the receive and transmit frequencies are already
the same.
Note that your dealer may have made provision for
“Talk Around” channels by programming “repeater”
and “Talk Around” frequencies on two adjacent channels. If so, the ACC key may be used for one of the
other Pre-Programmed Functions.
Call/Reset
When the 2-tone selective calling unit is installed, press
the ACC button to silence the receiver and reset for
another call, when a communication is finished.
Speed Dial
Your Dealer may have pre-programmed Auto-Dial
telephone number memories into your radio.
To dial a number, just press the Dealer-assigned ACC
button for Speed Dialing. The DTMF tones sent during the dialing sequence will be heard in the speaker.
TX Save Off
Press the ACC button to disable the Transmit Battery
Saver, if you are operating in a location where high
power is almost always needed.
The Transmit Battery Saver helps extend battery life
by reducing transmit power when a very strong signal from an apparently nearby station is being received.
Under some circumstances, though, your hand-held
radio may not be heard well at the other end of the
communication path, and high power may be necessary at all times.
ACC 1
Activates an optional Unit (module) while the ACC
button is held depressed.
When you release the ACC button, the optional Unit
will be disabled.
For further details, contact your VERTEX STANDARD
dealer.
ACC 2
Toggles the optional Unit “on” or “off” whenever you
press the ACC button.
For example, when the optional “FVP-25” voice encryption unit is installed, press the ACC button momentarily to disable the voice encryption feature temporarily.
Press the ACC button again to re-enable the voice encryption feature.
Accessories & Options
FNB-V57 7.2 V 1100 mAh Ni-Cd Battery Pack
FNB-V57IS 7.2 V 1100 mAh Ni-Cd Intrinsically safe Battery
FBA-25 Alkaline Battery Case (6 AA)
NC-76B 120 VAC Wall Charger
NC-76C 230-240 VAC Wall Charger
VAC-6400 6-Unit Multi charger
VAC-400B 120 VAC Desktop Rapid Charger
VAC-400C 230-240 VAC Desktop Rapid Charger
VCM-1 Mobile Mounting Bracket for VAC-400
MH-45B4B Speaker/Microphone
MH-37A4B Earpiece/Microphone
VC-25 VOX Headset
FVP-25 Encryption /DTMF Page Unit
VTP-50 VX-Trunk Unit
CT-42 PC-Programming Cable (CT-28 + CT-29)
CT-27 Cloning Cable (Set-to-Set Cloning)
FTT-17 16 keypad for VX-Trunk (VTP-50 required)
LCC-210 Leather Case
4
General
Frequency Range: 134-160 MHz (A), 148-174 MHz (C)
Number of Channels: 16 channels
Channel Spacing: 12.5/15/25/30 kHz
PLL Steps: 2.5/6.25 kHz
Power Supply Voltage: 7.5 V DC ±20 %
Battery Life (5-5-90 duty): 8.2 hrs. (9.9 hrs. w/saver) @5 W
Operating Temperature Range: –22° F to +140° F (–30° C to +60° C)
Frequency Stability: ±2.5 ppm
Dimensions: 4.21" (W) × 2.28" (H) × 1.0" (D) (108 × 58 × 26 mm)
Weight (Approx): 0.75 lb. (340 g) w/FNB-V57
Receiver (Measurements made per EIA standard TIA/EIA-603)
Sensitivity:
Adjacent Channel Selectivity: 65 dB (25 kHz)/60 dB (12.5 kHz)
Intermodulation: 65 dB
Spurious and Image Rejection: 65 dB
Hum & Noise: 45 dB
Audio Output: 500 mW @4 Ohms, 5% THD
EIA 12 dB SINAD:
20 dB Quieting:
0.30 µV
0.20 µV
Specifications
Transmitter (Measurements made per EIA standard TIA/EIA-603)
Power Output: 5 / 1 W (Selectable) or 3.5 / 1 W (Selectable) w/FBA-25
Modulation: 16K0F3E / 11K0F3E (Direct FM)
Conducted Spurious Emission: 60 dB Below Carrier
FM Hum & Noise: 40 dB (25 kHz) / 35 dB (12.5kHz)
Audio
Distortion (@1 kHz):
Specifications subject to change without notice or obligation.
< 5 %
5
Cloning
The VX-210A includes a convenient “Clone” feature,
which allows the programming data from one transceiver to be transferred to another VX-210A. Here is
the procedure for Cloning one radio’s data to another.
Note: When a cloning isn't made, you correct the following part using "CE45."
When a "Set-to-Set 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 right side of
the transceiver. 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 the PTT switch and ACC button
(just below the PTT switch) while turning the
transceiver on. Do this for both transceivers (the
order of the switch-on does not matter).
5. On the Destination transceiver, press the ACC
button (LED indicator will glow green).
6. Now, on the source transceiver, Press the PTT
switch.Data will now be transferred to the Des-
tination transceiver from the source transceiver (LED indicator will glow red).
7. If there is a problem during the cloning process,
LED indicator will blink red from source the
transceiver.
Check your cable connections and battery voltage, and try again.
8. If cloning is a successful, LED indicator will be
disappeared, turn the Destination transceiver
off. Now turn the source transceiver off.
9. Disconnect the CT-27. Replace the plastic cap
and its two mounting screws.
10. You can then turn the transceivers back on, and
begin normal operation.
Optional Cloning Cable CT-27
Dealer Programming of VTP-50
These procedures are designed to be used by the installing technician after the VTP-50 has been installed
in the transceiver. To program a VX-210A's VTP-50 board, you will need the CT-42 programming interface cable, the CE26 Programming diskette, and an IBM PC/AT or PS/2-compatible tyoe computer.
To enter the Programming mode, use the following procedure:
1. Turn the transceiver off.
2. Turn on the transceiver while holding in the ACC button (just below the PTT switch).
6
Exploded View & Miscellaneous Parts
REF. VXSTD P/N
U07230107
U20204007
U02206007
U9900051
U9900063
U9900068
U9900086
U9900084
PAN HEAD SCREW M2x3B #1
BINDING HEAD SCREW M2.6x4B
SEMS SCREW SM2.6x6B
TAPTITE SCREW M2x4B #3
TAPTITE SCREW M2x3.3Ni
TAPTITE SCREW M2x4Ni #3
TAPTITE SCREW M1.7x2.5B
BINDING HEAD SCREW M2x7.5B
Description
Non-designated parts are available only
as part of a designated assembly.
RA0173500
CAP
RA0111400
RING NUT
RA008920A
O RING
RA010300A
KNOB
RA0111500
RA0112300
COIL SPRING
RA0228800
KNOB
RA008890A
O RING
RA0107000
TERMINAL PLATE R
SPECIAL NUT
R3152420
O RING
M4090128
SPEAKER
Qty.
1
2
2
1
5
6
RA018500A Vertex (USA)
2
RA018510A (EXP)
1
FRONT CASE ASS'Y
RA0173400
RUBBER KNOB
RA0110200
HOLDER RUBBER
(MIC)
MAIN Unit
SW Unit
RA0123500
LATCH NAIL
RA018520A Vertex (USA)
RA018530A (EXP)
FRONT CASE ASS'Y
RA0173700
RUBBER KNOB (16KEY)
RA010340A
TERMINAL HOLDER
RA0106900
TERMINAL PLATE L
CP7131001
BELT CLIP ASS'Y
RA011070A
RUBBER PACKING
RA011720A
MYLAR SHEET
CP7130001
REAR CASE ASSY
7
Block Diagram
8
Circuit Description
1. Receive Signal Path
Incoming RF from the antenna jack is delivered to the
RF Unit and passes through a low-pass filter consisting
of coils L1001 and L1002, capacitors C1004, C1005, C1008,
C1010, C1014, and C1016, and antenna switching diode
D1003 (HVU131).
Signals within the frequency range of the transceiver
enter a varactor-tuned band-pass filter consisting of coils
L1010 and L1011, capacitors C1044, C1046, C1060, C1065,
and C1068, and diodes D1011 (HVC359), D1012
(HVC358B), D1013 (HVC358B), and D1014 (HVC359).
The signals are then amplified by Q1012 (2SC5006), and
enter a varactor-tuned band-pass filter consisting of coils
L1017 and L1021, capacitors C1084, C1086, C1089, C1095,
and C1097, and diodes D1018 (HVC359), D1019
(HVC358B), D1020 (HVC358B), and D1025 (HVC359), before delivery to first mixer Q1026 (SGM2016AM).
Buffered output from the VCO is amplified by Q1009
(2SC5005) to provide a pure first local signal between
126.3 and 152.3 MHz for injection to the first mixer, Q1026.
The 21.7 MHz first mixer product then passes through
monolithic crystal filter XF1001 (21R12A4, 12.0 kHz bandwidth) to strip away all but the desired signal, which is
then amplified by Q1033 (2SC4215Y).
The amplified first IF signal is applied to FM IF subsystem IC Q1037 (BA4116FV), which contains the second mixer, second local oscillator, limiter amplifier, noise
amplifier, and S-meter amplifier.
A second local signal is generated by the PLL reference/
second local oscillator generated by 21.25 MHz crystal
X1001, producing the 450 kHz second IF when mixed with
the first IF signal within Q1037.
The second IF then passes through ceramic filter CF1001
(Alfym450F) or CF1002 (SFPC450G: only on “Narrow”
channels) to strip away all but the desired signal, and is
then applied to the limiter amplifier in Q1037, which removes amplitude variations in the 450kHz IF, before detection of the speech by the ceramic discriminator CD1001
(CDBC450CX24).
Detected audio from Q1037 is applied to the audio highpass filter, and then passed via the volume control to the
audio amplifier Q1039 (TDA7233D), which provides up
to 0.5 Watt to the optional headphone jack or a 4-ohm
loudspeaker.
2. Squelch Control
The squelch circuitry consists of a noise amplifier and
band-pass filter within Q1037, and noise detector D1028
(1SS355).
When no carrier received, noise at the output of the de-
tector stage in Q1037 is amplified and band-pass filtered
by the noise amplifier section of Q1037 and the network
between pins 7 and 8, and then rectified by D1028.
The resulting DC squelch control voltage is passed to
pin 37 of the microprocessor, Q1014 (M37515E). If no carrier is received, this control signal causes pin 7 of Q1014
to go high and pin 20 to go low. Pin 7 signals Q1038
(IMD10A) to disable the supply voltage to the audio amplifier Q1039, while pin 20 makes Q1023 (IMX1) hold the
green (Busy) half of the LED off, when pin 7 is high and
pin 20 is low.
Thus, the microprocessor blocks output from the audio
amplifier, and silences the receiver, while no signal is being received (and during transmission, as well).
When a carrier appears at the discriminator, noise is removed from the output, causing pin 37 of Q1014 to go
low and the microprocessor to activate the “Busy” LED
via Q1014.
The microprocessor then checks for CTCSS or DCS code
squelch information, if enabled, or for DTMF data on the
optional DTMF Unit. If not transmitting and CTCSS or
DCS is not activated, or if the received tone or code matches that programmed, audio is allowed to pass through
audio amplifier Q1039 (TDA7233D) to the loudspeaker
by enabling the supply voltage to it via Q1038.
3. Transmit Signal Path
Speech input from the microphone is amplified by
Q1017 (NJM2902V); after pre-emphasis by C1066 and
R1054, the audio passes through another section of Q1017.
The processed audio may then be mixed with a CTCSS
tone generated by Q1014 (M37515E), then delivered to
D1005 (1SV229) for frequency modulation of the PLL carrier (up to ±5kHz from the unmodulated carrier) at the
transmitting frequency.
If a DCS code is enabled for transmission, the code is
generated by microprocessor Q1014 and delivered to
D1004 (1SV230) for DCS modulating.
If DTMF is enabled for transmission, the tone is generated by the microprocessor and is applied to the limiter
amplifier section in place of the speech audio. Also, the
tone is amplified for monitoring in the loudspeaker.
The modulated signal from the VCO Q1002
(2SC5231C8) is buffered by Q1007 (2SC5005) and amplified by Q1009 (2SC5005). The low-level transmit signal then passes through the T/R switching diode D1016
(DAN235U) to the driver amplifiers Q1015 (2SC5227) and
Q1016 (2SK2596), then is applied to the final amplifier
Q1024 (2SK2974), providing up to 5 Watts of output power.
9
Circuit Description
The transmit signal then passes through the antenna
switch D1003 (HVU131) and is low-pass filtered to suppress harmonic spurious radiation before delivery to the
antenna.
3-1 Automatic Transmit Power Control
RF power output from the final amplifier is sampled by
C1104 and C1111, and is rectified by D1027 (1SS321). The
resulting DC is fed back through Q1032 (FMW1) to the
drive amplifier Q1016 and final amplifier Q1024, for control of the power output.
The microprocessor selects “High” or “Low” power levels.
3-2 Transmit Inhibit
When the transmit PLL is unlocked, pin 7 of PLL chip
Q1005 goes to a logic “low.” The resulting DC unlock control voltage is passed to pin 24 of the microprocessor
Q1014. While the transmit PLL is unlocked, pin 22 of
Q1014 remains high, which then turns off Q1029 and the
Automatic Power Controller Q1032 (FMW1) to disable the
supply voltage to the drive amplifiers Q1015 and Q1016 and
final amplifier Q1024, thereby disabling the transmitter.
3-3 Spurious Suppression
Generation of spurious products by the transmitter is
minimized by the fundamental carrier frequency being
equal to final transmitting frequency, modulated directly
in the transmit VCO. Additional harmonic suppression is
provided by a low-pass filter consisting of L1001 and
L1002 plus C1004, C1005, C1008, C1010, and C1014, resulting in more than 60 dB of harmonic suppression prior
to delivery of the RF signal to the antenna.
4. PLL Frequency Synthesizer
The PLL circuitry on the Main Unit consists of VCO
Q1002 (2SC5231C8), VCO buffer Q1007 (2SC5005), and
PLL subsystem IC Q1005 (MB15A01PFV1), which contains a reference divider, serial-to-parallel data latch, programmable divider, phase comparator and charge pump.
Stability is maintained by a regulated 5 V supply, via
Q1031 (2SB1122S), R1022, and R1023, temperature compensating thermistors TH1001, TH1002, and TH1003, and
varactor diode D1004 (1SV230) (associated with the 21.25
MHz frequency reference crystal X1001).
While receiving, VCO Q1002 oscillates between 126.3
and 152.3 MHz according to the transceiver version and
the programmed receiving frequency. The VCO output
is buffered by Q1007, then applied to the prescaler section of Q1005. There the VCO signal is divided by 64 or
65, according to a control signal from the data latch section of Q1005, before being sent to the programmable divider section of Q1005.
The data latch section of Q1005 also receives serial dividing data from the microprocessor Q1014, which causes the pre-divided VCO signal to be further divided in
the programmable divider section, depending upon the
desired receive frequency, so as to produce a 2.5 kHz or
3.125 kHz derivative of the current VCO frequency.
Meanwhile, the reference divider section of Q1005 divides the 21.25 MHz crystal reference from the reference
oscillator Q1025, by 8500 (or 6800) to produce the 2.5 kHz
(or 3.125 kHz) loop reference (respectively).
The 2.5 kHz (or 3.125 kHz) signal from the programmable divider (derived from the VCO) and that derived from
the reference oscillator are applied to the phase detector
section of Q1005, which produces a pulsed output with
pulse duration depending on the phase difference between
the input signals.
This pulse train is filtered to DC and returned to the
varactor D1001 (HVU358). Changes in the level of the DC
voltage applied to the varactor, affecting the reference in
the tank circuit of the VCO according to the phase difference between the signals derived from the VCO and the
crystal reference oscillator.
The VCO is thus phase-locked to the crystal reference
oscillator. The output of the VCO Q1002, after buffering
by Q1007 and amplification by Q1009, is applied to the
first mixer as described previously.
For transmission, the VCO Q1002 oscillates between 148
and 174 MHz according to the model version and programmed transmit frequency. The remainder of the PLL
circuitry is shared with the receiver. However, the dividing data from the microprocessor is such that the VCO
frequency is at the actual transmit frequency (rather than
offset for IFs, as in the receiving case). Also, the VCO is
modulated by the speech audio applied to D1005
(1SV229), as described previously.
Receive and transmit buses select which VCO is made
active by Q1003 (UMC5N).
5. Miscellaneous Circuits
5-1 Push-To-Talk Transmit Activation
The PTT switch on the microphone is connected to pin
35 of microprocessor Q1014, so that when the PTT switch
is closed, pin 23 of Q1014 goes low. This signal disables
the receiver by disabling the 5 V supply bus at Q1036
(DTB123EK) to the front-end, FM IF subsystem IC Q1037
and receiver VCO circuitry.
At the same time, Q1027 (FMW1) and Q1029
(2SB1122S) activate the transmit 5V supply line to enable the transmitter.
10
Alignment
The VX-210A has been carefully aligned at the factory
for the specified performance across the frequency range
specified for each version. Re-alignment should therefore
not be necessary except in the event of component failure, or when altering the version type. All component replacement and service should only be performed by an
authorized VERTEX STANDARD representative, or the
warranty policy may be void.
Required Test Equipment
CT-42 Programming Cable with CE45 Channel Pro-
gramming Diskette
RF Signal Generator with calibrated output level at 200
MHz
Deviation Meter (Linear Detector)
AC Voltmeter
SINAD Meter
In-Line wattmeter with 5 % accuracy at 200 MHz
Regulated DC Power Supply adjustable from 4 to 10 V,
3 A
50-ohm Non-reactive Dummy Load: 10 W at 200 MHz
Frequency Counter: ±0.2 ppm accuracy at 200 MHz
AF Signal Generator
DC Voltmeter: high impedance
Before beginning alignment, connect the transceiver and
PC using the CT-42 Programming Cable, and run the CE45
Channel Programming Diskette, then download the EEPROM data from the transceiver to the computer.
Then store this data in a disk file so that it can be uploaded when alignment is finished.
You should find a data file on the computer disk corresponding to the transceiver version you are aligning, containing channel settings for the high edge, middle and low
edge of the transceiver’s frequency range in channels 1, 2
and 3, respectively. Up-load this file to the transceiver.
PLL & Transmitter
Set up the test equipment as shown for transmitter alignment. Adjust the supply voltage to 7.2 V for all steps where
not specified otherwise.
50-ohm
Dummy Load
RF Signal
Generator
Inline Wattmeter
Deviation Meter
Frequency
Counter
PLL VCV (Varactor Control Voltage)
Connect the DC voltmeter between TP03 (on the chip
side of the Main Unit) and ground.
Set the transceiver to CH 3 (high band edge), and ad-
just L1004 on the chip side of the Main Unit for 3.8 V
±0.1 V on the voltmeter.
Set the transceiver to CH 1 (low band edge), and con-
firm the low-end VCV is more than 0.8 V while transmitting, and also while receiving.
L1004
RF Sampling
Coupler
CT-42 connection
Cable
PC
Transceiver
MIC/SP
Power Supply
7.2V DC
COM port
Low Band Edge (Channel 1): 148.000 MHz
Band Center (Channel 2): 160.000 MHz
High Band Edge (Channel 3): 174.000 MHz
Note: Signal levels in dB referred to in the alignment proce-
dure are based on 0 dBµ EMF= 0.5µV (closed circuit).
TP03
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