Processed data from the U602 is applied to the VCO via R621
and applied to the TCXO VC
Frequency synthesizer circuit
With data received from the EEPROM (U503) the frequency synthesizer circuit controls and
Produces the RF carrier frequency for the transmitter during transmit and the local oscillator
frequency for the receiver. The frequency synthesizer circuit is comprised of:
•12.8 MHZ Tcxo
•Voltage Controlled Oscillator (VCO) module
•Charge Pump and Loop Filter
•PLL Frequency Synthesizer
•Dual Modulus Prescaler
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PLL Synthesizer
The module contains RX VCO and TX VCO . TX VCO for producing carrier frequencies during
The PLL synthesizer circuit is common to both the transmitter and receiver,
The synthesizer comprises:
Data
TCXO
U401
PLL
5V
Regulator
Loop Filter
Charge Pump
TX OR RX
VCO
RFOut
12.8 MHZ TCXO
X401 is VCTCXO , which provide stable oscillator of 12.8 MHZ to PLL IC.
Frequency adjustment is provided by VR401
.Voltage controlled oscillator module(VCO)
The module produces carrier frequencies during transmit and local oscillator frequencies during receive.
Transmit and RX VCO for producing the local oscillator frequency during receive .
The module also has Rx and TX powerline filters.
RX and TX power line filters
Transistor Q306 is configured as a 5v power supply ripple filter. The filter reduces the noise on the carrier and
local oscillator signals.
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RX
VCO
The RX VCO comprises JFET Q301, coil L302 , and varactor D301 and is configured as a Colpitts Oscillator .
D301 produces a change in frequency with a change in DC voltage and is controlled by the tuning voltage signal
present at the cathode. The local oscillator signal at the source of Q301 isa pplied to the buffer/amplifier formed
by Q305 and Q201.The Local signal is applied to the mixer when diode D203 is reverse biased and D202 is
forward biased.
TX VCO
The TX VCO comprises JFET Q302,coil L305 , and varactor D302 and D303 and is configured as a Colpitts
oscillator . D302 produces a change in frequency with a change in DC voltage and is controlled by the tuning
voltage signal present at the cathode. The AF signal at J901 pin 1 is applied to the cathode of D303 to produce
FM modulation. When diode D203 is forward biased and D202 is reversed biased the modulated RF signal at the
collector of Q201 is passed to the power Amplifier and harmonic filter via the cascode buffer/amplifier Q205.
PLL IC
The reference frequency from the TCXO, at 12.8 MHZ , is connected to pin 1 of U401(MB1504) the appropriate
VCO is connected to pin 11.
REFDIV divides the 12.8 MHz to produce a reference frequency (Fr) of 5 or 6. 25 kHz dependent upon channel
spacing selected. VARDIV divides the prescaled VCO frequency to produce a variable frequency (Fv). Fv and Fr
are fed to the phase detector.
Phase detector
When Fv=Fr, the phase detector output (pins 15 and 16,U401) produces narrow negative pulses and Fv and Fr
pulse widths are identical. When Fv〉Fr pin 15 (V) pulses negative with pin 16(R) remaining high.
When Fv〈Fr pin 16 (R) pulses negative with pin 15(V) remaining high.
The signal at pin 15 and 16 is smoothed the loop filter and applied to the VCO.
Out-of-lock detector
The out-of-lock detector produces a series of logic level pulses when the loop is out of lock at pin 7 of U401.The
pulses at pin 7 of U401 are buffered by Q401 and then integrated by R407 and C406. The product of the
integrating circuit is fed to Q202 to turn off transmitter power.
Charge Pump and Loop Filter
Transistors Q402~Q404 , and associated resistors and capacitors form the charge pump and loop filter .
The phase detector output from U401 pins 15 and 16 are combined by the charge pump to produce a 0 to 8V
tuning voltage signal.
The signal is filtered by the loop filter (R414,C414 and C413) to remove any residual reference frequency
harmonics from the signal. After filtering the signal is applied to the voltage controlled oscillator module.
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DC REGULATOR
The DC Regulator U402, converts the +13.6 V to a 5V supply .
This is used to provide the tuning voltage for the VCO .
Dual modulus prescaler
The prescaler divides the VCO frequency by 64 or 65.
Transmitter
The transmitter comprises:
VCO BufferPA Module
Amp
RF LPF
Automatic
Power Control
ANTENNA
SWITCH
Buffer
When the radio is in transmit mode the diode D203 is forward biases enabling the modulated RF signal
from the VCO to pass to the buffer/pre-amplifier Q205 and associated components.
The output signal is passed from Q205 to Q206 via a matching network consisting of inductor L203 and
C217.
PA module
The signal is then amplified for transmission by 207, which is a power amplifier module.
Low pass filter
The amplified RF signal is passed through the stripline coupler and is fed to the harmonic low pass filter,
comprising L211 to L212 and C228-C240 and then to the antenna connector (ANT).
Antenna Switch
When transmitting, the diodes D205 are forward biased, allowing the RF to pass to the antenna. D206 is
shorted to ground which makes L210 look open circuit (1/4 wave tuned stub). This prevents the TX signal
from passing to the receiver stage.
Power output control .
The RF power tuning by VC201,which make sure the current less than 1300mA when output power is 5 W.
PAGE7
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Receiver
The receiver comprises:
Rx
VCO
SAW FILTER&
ANTENNA
SWITCH
IFAmp
Amp
First Mixer
Second
Mixer
Local
Oscillator
IFFilter
IF
Filter
Data Out
Audio Filter
FM
Limiter-
Discnminator
Squelch
Circuit
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Antenna Switch
In receive, the diode D205 are reverse biased. L210 is now in circuit, passing the signal from the antenna to
the front-end amplifier Q101.
Front End
The receiver signal is passes through the band pass filter consisting of C101 to C109/L101 to L104.
Diode D101 serves as protection from RF overload from nearby transmitters.
The input signal is coupled to the base of Q101 which serves as an RF amplifier.
The output of Q101 is then coupled to a second bandpass filter consisting of C114 to C119 / L105 to L107.
The output of the front end signal then coupled to the dual-gate FET mixer Q102.
First Mixer
Q102, 2-pole crystal filters XF101 and coils T101 and C123 form the First Mixer and First IF Filter.
The RF signal, from the front-end filter and amplifier Q101 is applied to the VCO local oscillator signal to
make mixer.
The difference frequency of 21.4 MHz is taken from Q102 and is filtered by the crystal filters XF101.
The tuned circuits T101 and associated components provide matching of the crystal filters to ensure a good
pass-band response and selectivity.
The IF signal is amplified by Q103 and passed to the FM Detector IC.
Second mixer, Second IF, FM detector
The output of the IF amplifier is fed into the narrowband FM IF Integrated Circuit U101 (MC3361).
This is a single conversion FM receiver which contains the second mixer, second IF amplifier, and FM
detector.
Crystal X101,connected to pin 1 of U101, determines the second local oscillator frequency.
In this case the crystal has a frequency of 20.945MHz. The first IF signal is applied to the mixer and
resultant frequency of 455KHz, is the difference between the IF signal and second local oscillator.
The 455KHz IF signal is output from pin 3 and is applied to a 455KHz band-pass filter CF1.
The output of CF1is passed via pin 5 to a high gain IF amplifier coupled to the adjustable quadrature
detector CD1.Any detected signal is produced at pin 9 of U101 and applied to the ReceiverAudio Circuit
and the Mute (Squelch) Circuit.
Squelch ( MUTE ) Circuit
Any noise signal is amplified by U101 internal noise
U101. The squelch trigger output (pin 13,U101) is applied to the pin 6 of J903.
When noise is present, the voltage at pin 12 of U101 is exceeds than 0.7V. The squelch trigger output is
open, It’s make pin 6 of J903 open state.
When no noise is
present, the
voltage at pin 12 of U101 less 0.7v and pin 13 of U101 is HI voltage.
amplifier .signal is applied to pin10 of
This make pin 6 of J903 short state.
VR101 is set to tuning squelch when 25khz channel space is present.
Carrier Detect
A Carrier Detect ( MUTE DETECT ) output is available on pin 6 of J903 .
AF Output Low Pass Filter
A low pass filter formed by R115 and C132 removes any extraneous 455kHz energy from the AF output of
the FM receiver chip (pin 9 of U101).
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The filtered signal is passed to pin 2 of J903.
Microcontroller
The PIC16C57C04 microcontroller IC controls the programmable features and frequency synthesizer data.
Programming Mode
The programming mode allows the user to retrieve or program TX/RX frequencies, when pin 2 of J903 is set to
ground. Programming mode will Inhibit , serial communications can then be made in order to read/program the
on- board EEPROM ( U503 )which contains radio- specific data.
EEPROM
Relevant channel information, such as Rx/ Tx frequencies, is stored in the EEPROM( U503) which is a 93C46.
This information may be programmed and erased via the D- type socket.
The EEPROM has 1024 (8x128) capacity and is written serially.
Power supply circuit
The data radio is supplied with a nominal + 13.8V dc power supply input from external
equipment which is filtered using C512. This supply is converted into 5V
voltage levels on the board using the regulator U402 and associated components .
This +5V line is fed to the CPU circuit .
4. PERFORMANCE TEST AND ALIGNMENT
The alignment and performance test procedures assume the use of the following equipment.
Discrete test equipment
Volt MeterSpectrum Analyser and notch filter(option)
RF Power Meter.Coupler (20dB isolation)
DC Power Supply, 0-15V 2AminDistortionMeter
Oscilloscope, 20 MHz dual beam
RF Frequency Counter,
100 kHz - 600 MHz
AF Signal Generator 0 – 20 kHz
RF Signal Generator
SINAD Meter
Modulation Meter
Audio Power Meter
PAGE10
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5
. TEST EQUIPMENT CONFIGURATION.
RF Signal Generator
Watt Meter with
20dB Attenuator
Audio Generator
Modulation Meter
SINADMeterOSCILLOSCOPE
RADIO
VOLT Meter
DC Power Supply
Spectrum Analyzer
Frequency Counter
123.45678
Test Box
Test Equipment Configuration
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6. TRANSMITTER PERFORMANCE TESTS
Power Output
Transmit periods longer than 3 minutes are to be avoided.
1.Set the power supply voltage to 13.8V dc. and monitor the voltage during transmit.
2.Switch data radio TX and check and record the output power. The nominal output
power is adjustable about 5W and make sure the current less than 1300 mA..
3.Set the PTT switch to OFF .
Frequency accuracy
1.Whilst transmitting, measure the transmit frequency using the RF frequency counter.
2.Adjust VR401 so that frequency is as close as possible to the exact required transmit frequency.
Ideally it should be within 100 Hz at room temperature.
Peak Deviation
1.Connect the oscilloscope to the output of the modulation meter.
2. Set the AF signal generator to 1000 Hz at 106mV and connect to DATA _IN line ( pin 1 of J501 )
3.Switch data radio to TX and observe the oscilloscope display to check that the 1000Hz
tone is a sine wave and adjust VR601 to make deviation is about 3.5KHZ.
4.Using the AF signal generator, sweep from 100 Hz to 3 kHz and record the peak deviation.
5.Check the peak deviation for appropriate channel spacing as follows:
For 12.5 kHz channel spacing, Peak deviation is not greater than 2.5 kHz.
For 20 kHz channel spacing, Peak deviation is not greater than 4 kHz.
For 25 kHz channel spacing, Peak deviation is not greater than 5 kHz.
Spectrum Test
It may be necessary to notch the fundamental signal during this test.
1.Connect a spectrum analyser and RF power meter to the antenna socket.
2.Switch data radio to TX. Observe the output spectrum on the spectrum analyser.
3.Adjust notch filter to minimise the carrier. All spurious and harmonics signals
should be below- 36 dBm up to 1 GHz and below –30 dBm between 1 and 4 GHz.
4.Switch off the data radio transmit control.
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Receiver Performance Tests
Sensitivity
The SINAD performance test may be used to test the sensitivity of the receiver.
1.Connect the RF signal generator to the data radio BNC antenna connector.
2.Set the RF signal generator to the receive frequency .
3.Connect the leads of the SINAD meter between 0 V and pin 2 on J501.
4.Set the deviation to 60﹪of the peak system deviation.
5.Set the AF generator to 1 kHz.
6.Adjust the RF signal generator level until the SINAD Meter reads 12 dB.
7.Check that the signal generator RF level is less than 0.25uV pd (-119dBm ).
Squelch/Carrier Detect Adjustment
1.Set the RF signal generator to the receiver frequency with 60﹪deviation. Set the AF signal to 1 kHz
2.Set RF input level to give -113dBm.
3.Adjust VR101 until CDS J501 pin 6 changes state from “HIGH”to “LOW”.
4.Reduce RF input level to –115dBm and check that CDS line goes HIGH .
Switch off the RF generatorand disconnect the test equipment.
Please Read this file, before you first use the software.
TABLE OF CONTENTS
1. Brief introduction
2. Before Installing
3. Install PC Programmer
4. INSTRUCTIONS
5. UnInstall PC Programmer
1. Brief introduction
A. A computer to install this program with at least 2 MB available space
ROGRAMMER INSTRUCTION
Welcome to PC Programmer. This program is designed to be used with the
Interface Adapter.
The following equipment will be needed to program the Device:
in hard disk and a 9-pin male RS-232 serial port.
B. Win XP Operation System.
C. Part of the Programming Kit
1) An interface Adapter.
2) A CD disk with the program, PC Programmer files
2. Before Installing
Before You Run Setup, make sure that your computer meets the minimum
requirements mentioned above, and read the Readme file(this file).
NOTE: If you firstly install PC Programmer in you system, the setup may
update some system files on your computer , so you may run the
setup again after your system be updated. Please follow the
installation instruction on the screen.
3. Install
TO install PC Programmer on your computer
1)Insert the CD.
2)Run Setup.exe
3)Follow the installation instruction on the screen.
Important: You cannot simply copy files from the CD to your hard disk
and run PC Programmer . You must use the Setup program,
which decompresses and installs the files in the appropriate
directories.PAGE 23
Page 25
4. INSTRUCTIONS
4.1 Connection
4.2 Start up PC Programmer
4.3 Edit Configuration
4.3.1 Open/Recall/Upload Configuration file
4.3.2 Edit Channel data
4.3.3 Set Option item
4.3.4 (Block)Cut/Copy/Delete/Paste
4.3.5 Auto-Frequency edit
4.3.6 Save a Configuration to disk
4.3.7 Download Configuration to device
4.3.8 Print a Configuration
4.4 Exit PC Programmer
4.1 Connection
1.Connect one side of Interface Adapter to the computer's serial port.
Never care the port number, the PC Programmer will locate it
automatically.
2.Connect the other side of Interface Adapter to the Device's 26-pin
female port.
3.Connect power supply to device and LED will be light. The device will into
PC_programming mode automatically, please see the picture of below.
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4.2 Start up PC Programmer
1.Select 'Start', choose 'Programs',
click on the '*** AES-7350 Series' program.
2.When HD Serial PC Programmer is started, a main form will be shown
after a greeting form.
3.There has a menu bar at the top of the main form, and a message box
at the bottom.
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NOTE:The program is menu driven for all pertinent commands. All the
commands can be accessed by either key board or the left mouse
button.
Access keys mainly used are:
'Tab' or 'Arrow'to move focus(or cursor)
'Enter' to active a focused command
4.3 Edit Configuration
4.3.1 Open/Upload Configuration file
To edit the configuration, please either
1)Recall an Existing Configuration by click on the 'Open' item in
the File Menu, select the configuration file by click on or input
its name then press 'Enter' key.
OR 2)Upload configuration data from a device by click on 'Upload' item
in the Device menu. to a Configuration window .
Different Model's device Configuration can be opened and edited.
There are two fields in each Configuration window: system data
and Channel data.
OR 3)Open an existing Configuration by click on the 'OPEN' item in the
File Menu. A pop up window will be shown, select a file by arrow
key or mouse then click 'OK'.
4.3.2 Edit Channel data
1)Set focus to the Channel data field by move the mouse pointer.
2)Select a particular channel number to be edited by either the
arrow key or click on it.
3)Pop up input window by either press 'Enter' key or double click
on the selected channel number.
4)Use computer's cursor keys, Tab key, Enter key, arrow key or
mouse to renew the channel data.
5)Click 'OK' button on the input window to accept the change or
'Cancel' to not change, and return back to Configuration Window.
4.3.3 Edit Option item
1)To Edit Channel Option, Select a particular channel number in
the Option View Window by either the arrow key or click on it,
then Pop up the input window for Channel Option, 'Enter' key or
double click on the selected channel number.
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2)To Edit System Option, Pop up input window for System Option,
click "SYSTEM" in the 'OPTION' menu.
3)To Edit Advanced Option, Pop up input window for Advanced Option,
click "ADVANCED OPTION" in the 'OPTION' menu.
4Use computer's cursor keys, Tab key, Enter key, arrow key or
mouse to renew the Option Item.
5)Click 'OK' button on the input window to accept the change or
'CANCEL' to not change, and return back to Configuration Window.
4.3.4 (Block)Cut/Copy/Delete/Paste
To select a block of channel data as source by either
1)Select start channel by arrow key, then while press 'Shift' key
select end channel number by arrow key.
2)Click on start channel, then while press 'Shift' key click on
end channel number
3)Press the left mouse button on start channel then move the mouse
until reach the end channel number, release left mouse button.
A)To Cut selected (block) Channel(s) either press 'Ctrl'+'X'or
click 'CUT' item in Edit menu.
B)To Copy selected (block) Channel(s) either press 'Ctrl'+'C'or
click 'COPY' item in Edit menu.
C)To Delete selected (block) Channel(s) either press 'Del(Delete)'
key or click on 'DELETE' item in Edit menu.
After Cut or Copy, the data can be pasted to where you want.
D)To Paste , select a channel as the start number of target , then
either press 'Ctrl'+'V' or click on 'PASTE' item in Edit menu.
NOTE: Paste operation allows you to export data to any Configuration
window opened.
4.3.5 Auto-Frequency edit
This feature provide you with a quick Frequency set function.
To use this command after either
1)Click 'EDIT' Menu
2)Click on 'AUTOFREQ' item in 'EDIT' menu to pop up a input window.
3)Use computer's cursor keys, Tab key, Enter key, arrow key or mouse
to set data.
4)Click 'OK' button on the input window to accept the change or
'CANCEL' to not change, and return back to Configuration Window.
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4.3.6 Save a Configuration to disk
1)Different configuration can be saved to disk.
2)Click on 'SAVE' item in 'FILE' Menu will overwrite an existing
configuration file on your disk by current configuration.
3)Select 'SAVE AS' from 'FILE' Menu will save the current
configuration by a name as you prefer.
4.3.7 Download to device
To Download current Configuration to device, select 'DOWNLOAD' from
sub menu under 'DEVICE' menu.
4.3.8 Print a Configuration
Click on 'PRINT' item in 'FILE' Menu will send current Configuration
to printer.
4.4 Exit PC Programmer
To Exit PC Programmer,click on 'EXIT' item in 'FILE' Menu.
5. UnInstall PC Programmer
To uninstall PC Programmer from your hard disk, select 'Start'
, choose 'Settings', click on the 'Control Panel', then find 'Add/Remove
Programs' icon from the pop up window then double click on it, then find
'*** Serial PC Programmer' from application list and click on it, then click
on 'Add/Remove' button under application list, then follow the
instructions on your screen.
PAGE28
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Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 90 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation.
This equipment generates, uses and
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one of the
following measures:
. Reorient or relocate the receiving antenna.
. Increase the separation between the equipment and receiver.
. Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
. Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: To assure continued compliance, any changes or modifications not
expressly approved by the party responsible for compliance could void the user's
authority to operate this equipment. (Example - use only shielded interface cables
when connecting to computer or peripheral devices).
FCC R
This
uncontrolled environment. This equipment should be installed and operated with a
minimum distance of 0.9 m between the radiator and your body.
This transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
The antennas used
distance of at least 0.9 m from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
This device complies with Part 90 of the FCC Rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept
any interference received, including interference that may cause undesired operation.
for this transmitter must be installed to provide a separation
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