Navstar Systems A190-001G1 User Manual 8a

Navstar Systems Ltd 8a

Contents

8a

Download: Navstar Systems A190-001G1 User Manual 8a
Mirror Download [FCC.gov]Navstar Systems A190-001G1 User Manual 8a
Document ID78329
Application IDBMLV0MwoiVbllVn+vd3UwQ==
Document Description8a
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatAdobe Acrobat PDF - pdf
Filesize100.2kB (1252515 bits)
Date Submitted1999-12-27 00:00:00
Date Available1998-09-03 00:00:00
Creation Date2001-05-05 01:40:51
Producing SoftwareAcrobat Distiller 4.0 for Windows
Document Lastmod2001-05-05 01:40:53
Document Title8a

HIGH SPECIFICATION DATA TRANSCEIVER
PART NO. 242-3474—XXO
Copyright© 1996 by the E.F. Johnson Company
The BF. Johnson Company designs and manufactures two-way radio equipment to serve a wide variety of communications
needs. Johnson produces equipment for the mobile telephone and land mobile radio services which include business, indus-
trial, govemment, public safety, and personal users. In addition, Johnson designs and manufactures electronic components
used in communications equipment and other electronic devices.
LAND MOBILE PRODUCT WARRANTY
The manufacturer‘s warranty statement for this product is available from your product supplier or fi'om the EF. Johnson Com»
pany, 299 Johnson Avenue, Box 1249, Waseca, MN 56093-0514, Phone (507) 835-6222.
WARNING
This device complies with Part 15 of the FCC rules. Operation is subject tothe condition that this device does not cause harm-
ful interference. In addition, changes or modification to this equipment not expressly approved by E. F. Johnson could void
the user's authority to operate this equipment (FCC rules, 47CFR Parr 15.19).
DO NOT allow the antenna to come close to or touch, the eyes face‘ or any exposed body parts while the radio is transmitting.
DO NOT operate the radio near electrical blasting caps or in an explosive atmosphere
DO NOT operate the radio unless all the radio frequency connecrors are secure and any open connectors are properly tenni-
nated,
DO NOT allow children to operate transmitter equipped radio equipment.
SAFETY INFORMATION
Proper operation of this radio will result in user exposure below the Occupational Safety and Health Act and Federal Commu-
nication Commission limits.
The information in this document is subject to change without notice.
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.1
2.2
3.1
3.2
33
3.4
4.1
4.2
4.3
TABLE OF CONTENTS
GENERAL INFORMATION
SCOPE OF MANUAL ................
EQUIPMENT DESCRIPTION. . ,
GENERAL ....................
DM3474 SYNTHESIZER PROGRAMMING .
TRANSCEIVER IDENTIFICATION
PART NUMBER BREAKDOWN
ACCESSORIES ...............
FACTORY CUSTOMER SERVICE
PRODUCT WARRANTY . . .
REPLACEMENT PARTS. . .
FACTORY RETURNS ...........
INSTALLATION
HIE-INSTALLATION CHECKS ............................
INTERFACING WITH DATA EQUIPME T
DM3474 ONLY .........................
PROGRAMMING
INTRODUCTION ................................ 3-1
DM3474 SYNTHESIZER DATA PROTOCOL . . 3-1
D~WORD . . .. . 3-1
B-WORD ,
A-WORD , . . .
RECEIVE T0 TRANSMIT SEQUENCE .
TRANSMIT TO RECEIVE SEQUENCE , .
CIRCUIT DESCRIPTION
GENERAL .......
INTRODUCTION
SYNTHESIER
RECEIVER. . . .
TRANSMITTER .
SYNTHESIZER ......
INTRODUCTION ....................
VOLTAGEACONTROLLED OSCILLATOR , . .
VCO AND REFERENCE OSCILLATOR MODULATION
CASCODE AMPLIFIERS (QSSI/QSSZ) ...............
AMPLIFIER (0853) ........
VOLTAGE FILTER (Q832) , . .
VCO FREQUENCY SHIFT (Q831) ,... .
SYNTHESIZER INTEGRATED CIRCUIT (USOI) .
LOCK DETECI' ........................
RECEIVER CIRCUIT DESCRIPTION . . .
HELICAL FILTER (Z201), RF AMPLIFIER (Q201)
MIXER (U221) FIRST LO AMPLIFIER (Q301)
AMPLIFIER (0222) CRYSTAL FILTER (2221/2222) IFAMP (QZZI).
SECOND LO AMP/TRIPLER (Q401). SECOND IF FILTER (Q901) ...............
2— 1
3-1
3-2
3-3
34
3-5
3—6
4-1
4-2
4- 3
SH
6—1
62
6—3
8-1
8-2
84
1-1
LIST OF FIGURES
DM3474 INTERFACE CABLE, .
D-WORD ...................
B-WORD . . .
A-WORD A . .
SERIAL INPUT WORD FORMAT
RX TO TX TIMING DIAGRAM ..
TX TO RX TIMING DIAGRAM , .
DATA TRANSCEIVER BLOCK DIAGRAM .
USO] SYNTHESIZER BLOCK DIAGRAM,
U241 BLOCK DIAGRAM .............
RECEIVER SERVICING FLOWCHART I .
TRANSMITTER SERVICING FLOWCHART A .
”TRANSMITTER TEST SETUP . . .
RECEIVER TEST SETUP ......
ALIGNMENT POINTS DIAGRAM. . .
VCO COMPONENT LAYOUT (COMPONENT SI'DE VIEW) .............
TRANSCEIVER COMPONENT LAYOUT (COMPONENT SIDE VIEW) . 4 . . 8-2
TRANSCEIVER COMPONENT LAYOUT (OPPOSITE COMPONENT SIDE VIEW) . . 8-2
TRANSCEIVER SCHEMATIC ................................ . 8-3
LIST OF TABLES
ACCESSORIES . . .................................................................... 1-1
SECTION 1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL
This service manual contains alignment and ser-
vice information for the Johnson DM3474 UHF High
Specification Data Module Transceiver.
1.2 EQUIPMENT DESCRIPTION
l.2i1 GENERAL
The E.F. Johnson DM3474 is a synthesized data
transceiver (transmitter and receiver) which operates
in the 403-512 MHz UHF frequency range. Transmit-
ter power output is 2 watts nominal, and operation is
simplex or half duplex.
Versions of the 3474 covered in this manual are
indicated in Section L4. The 3474 has a frequency
stability of z 1.5 PPM (see Section 3).
The number of channels that can be selected
with the DM3474 model is determined by the cus-
tomer supplied synthesizer loading circuitry.
122 DM3474 SYNTHESIZER PROGRAMMING
The DM3474 requires customer supplied cir-
cuitry to load the synthesizer with channel informa-
tion. The protocol that this circuitry must follow is
described in Section 3.
13 TRANSCEIVER IDENTIFICATION
The transceiver identification number is primed
on a label that is affixed to the PC board. The follow-
ing information is contained in that number:
MM“ anam- Mani-nun H r “mg-try
Lelt te '" ‘"" ’
—r— " —¥'__ ”1— —l—
n" 1 A l l J A 11345
mm mm Week No. Ll y.“
al PN of Var
Ivl
1.4 PART NUMBER BREAIQOW'N
The following is a breakdown of the part number
used to identify this transceiver:
242-3474 - X X X
enable
.5 kHz BW
2 kHz BW
3 = 5 kHz SW
2 = 403—419 MHz
3 = 419-435 MHz
4 = 435-451 MHz
5 = 450-466 MHz
6 = 464—480 MHZ
7 = 480496 MHz
8 = 496—512 MHZ
1.5 ACCESSORES
Accessories available for the 3474 data trans—
ceiver are listed in Table 1-1.
Table 1-1 ACCESSORIES
023-3472-040
023-3472—009
023-3474-00 l
DM3474 Receive Test Filter
MCX to SMA RP cable
3474 Low Power Kit
1.6 FACTORY CUSTOMER SERVICE
The Customer Service Department of the BF.
Johnson Company provides customer assistance on
technical problems and the availability of local and
factory repair facilities. Customer Service hours are
January I996
Pan No, 001—3474-00l
requesting them when you send a unit in for repair,
Clearly describe the difficulty experienced in the
space provided and also note any prior physical dam-
age to the equipment. Include a form in the shipping
container with each unit. Your phone number and
Contact name are very important because there are
times when the technicians have specific questions
that need to be answered in order to completely iden—
tify and repair a problem.
When ramming equipment for repair, it is also a
good idea to use a P0 number or some other reference
number on your paperwork in case you need to call
the repair lab about your unit. These numbers are ref-
erenced on the repair order to make it easier and faster
to locate your unit in the lab.
Return Authorization (RA) numbers are not nec-
essary unless you have been given one by the Field
Service Department. They require RA numbers for
exchange units or if they want to be aware of a spe-
cific problem. If you have been given an RA number,
reference this number on the Faetory Repair Request
Form sent with the unit. The repair lab will then con-
tact the Field Service Department when the unit
an'ivesi
thLRAL lthKNlAl IU.\
January 1996
Part No. 001-3474-00]
GENERAL INFORMATION
The following are general specifications intended for use in testing and servicing this transceiver. For current ad-
vertised specifications, refer to the specification sheet available from the Marketing Department. Specifications are
subject to change without notice.
GENERAL
Frequency Range
Frequency Control
Channel Spacing
Mode of Operation
Operating Voltage
Regulated Supply Voltages
RF Input/Output
Power and Data Interface
Operating Temperature
Maximum Dimensions
Weight (w/o Loader Bd)
FCC Compliance
RECEIVER
Bandwidth
Frequency Stability
Sensitivity - 12 dB SINAD
RF Input Impedance
Selectivity
Spurious and Image Rejection
Inter-modulation
FM Hum and Noise
Conducted Spurious
Receive Current Drain
Receive Attack Time
Audio
Distonion
Output Level DM3474
Response
DM3474
Minimum Load Impedance
TRANSMITTER
Bandwidth
Frequency Stability
TCXO Coupling
RF Power Output
RF Output Impedance
Modulation Distortion
Duty Cycle
Transmitter Attack Time
Spurious and Harmonic PM
PM Hum and Noise
Audio Response
Data Input Impedance
Modulation Response
Current Drain
403-512 MHz
Synthesized
1215/20/25 kHz
Simplex or Half Duplex
+7.5V DC 110%
+SV DC 15%
MCX Jack
14-pin in-Iine socket, 100 mil center
-30° to +60“ C (-22° to +I40° F)
2183" L (7.19 cm), 2.19" W (5.56 cm), 0164“ H (1.70 cm)
23 oz (65 g)
DM3474 customer must apply
16 MHz
$1.5 PPM
0.45 11V
50 ohms
-70 dB
—60 dB (12.5 kHz), -70 dB (20/25 kHz)
-70 dB
—40 dB (12.5 kHz), —45 dB (20/25 kHz)
-57 dBm
< 70 mA nominal
< 7 ms (dependent on synthesizer loading implementation)
< 3%
600—1200 mV P-P or 200-400 mV RMS(1 kHz at 1:3 kHz)
fl dB from DC to 5 kHz (reference to 1 kHz)
1k ohms
16 MHZ
1145 PPM
DC
ZW nominal adjustable to 500 mW (-XXO)
500 mW nominal adjustable to 75 mW (with Low Power Kit)
50 ohms
< 3%
50%, 60 seconds maximum transmit
< 7 ms (dependent on wnthesizer implementation)
-37 dBm
40 dB 12.5 kHz, -45 dB 25 kHz
$1.5 dB from DC to 5 kHz (reference to 1 kHz)
Programmable to 11 dB at the RF hand edges via 1201, pin 14.
100k ohm
$1 dB from DC to 5 kHz (reference to 1 kHz)
< 800 mA at 2w, +7.5V DC
January |996
1-5 Part N01001»3474-001
SECTION 2 INSTALLATION
2.1 PRE-INSTALLATION CHECKS
Field alignment should not be required before the
3474 is installed. However, it is still good practice to
check the performance to ensure that no damage
occurred during shipment. Performance tests are
located in Section 6.2.
2.2 INTERFACING WITH DATA EQUIPMENT
2.2.1 DM3474 ONLY
Connector J201 on the data transceiver PC board
provides the interface with the data equipment. This is
a 14-pin female connector with .025" square pins on
0. l " centers (Dupont 76308—114), An interface cable
diagram and pin designations are shown in Figure 2-1.
This cable is not included with the data transceiver.
The following is a general description of the vari-
ous 120] input and output signals.
Pin 1 (Ground) » Chassis ground.
Pin 2 (+7.5V DC Continuous) - This voltage should
be stabilized near +7.5V DC. Variations from +6V to
+9V can change power output as much as 6 dB.
Pin 3 (+7.5V DC Transmit) - This input should be
+7.5V DC in transmit mode only.
Pin 4 (+5V DC Receive Control Line) - This input
should be +5V DC in the receive mode only, 3 0.3 V
DC in Tx, input impedance 2 10k ohms.
Pin 5 (+5V DC Continuous) - This voltage should be
stabilized near +5V DC.
2-l
Pin 6 (TX Input) - Provides a response ofil .5 dB from
DC to 5 kHz. The sensitivity is approximately 7 kHz
deviation per volt RMS. When this input is used, a
temperature compensated 2.5V DC bias is required be-
cause variations in voltage cause the frequency to
change. In addition, the transceiver regulatory compli-
ance must be applied for with the customer supplied
modulation limiting/filter circuit and chassis.
Pin 7 (Synthesizer Lock) - Output from synthesizer
lock detect circuit. Low = unlocked, high = locked.
Pin 8 (Synthesizer Enable) - Latch enable signal. A
rising edge on this input latches the data loaded into
synthesizer 1C U801.
Pin 9 (Synthesizer Data) - Serial data line used for
programming synthesizer lC U801.
Pin 10 (Synthesizer Clock) — Software generated seri»
al clock. Data is valid on the rising edge ofthis signal.
Pin 11 (Carrier Detect) - This output is not used at this
time.
Pin 12 (R551 Output) - The RSSl (Receive Signal
Strength indicator) output provides a voltage that in-
creases in proportion to the strength ofthe RF input
signal.
Pin 13 (Rx Output) - The data output level is 600-
1200 millivnlts P-P (200-400 mV RMS) with a modu‘
lation signal of 1 kHz at 60% of maximum deviation.
The output is DC coupled and referenced to +2.5V DC.
Load impedance should be lOk—lOOk ohms.
January l996
Part No. 001-3474-001
SECTION 3 PROGRAMMING
3.1 INTRODUCTION
DM3474 ~ The information in Section 3.2
describes synthesizer programming protocol. This
information can be used as a basis for designing the
synthesizer programming hardware and software
required.
3.2 DM3474 SYNTHESIZER DATA PROTOCOL
Programming of the dividers and the charge
pumps are performed on a 3-1ine bus; SYNTH
ENABLE, SYNTH DATA, AND SYNTH CLK. On
initial power up three 34»bit words are required to
load the 3474 Data Transceiver. After the initial load,
one 32-bit word can be used to change channels.
The SA7025 Synthesizer 1C uses four address
words; D, C, B and A (see Figure 3-4). The C word is
not used in the 3474. The 24- and 32-bit words con-
tain one or four address hits, depending on the address
bits, the data is latched into registers. When the A-
word is loaded, the data ofthese temporary registers is
loaded together with the A-word into the work
registers.
3.2.1 D—WORD
Refer to Figure 3—1,
TCXO Reference Frequency is I7.5 MHz.
Loop Reference Frequency is 50 kHz.
Reference Divide (NR) = 17.5 MHz % 50 kHz
i—O— ecrma or 0010101110 Binary.
__/ ecotmutilllo
The 3474 has frequency resolution of 625 kHz
and 10 kHz. When programming 6.25 kHz frequency
resolution use FM‘OD=8. When programming 10 kHz
frequency resolutlon use 0D=5.
Example:
(FCM) + FMOD = 50 kHz + 8 = 6.25 kHz
(FCM) + FMOD = 50 kHz + 5 = 10 kHz
Where:
FCM 1 Loop Reference Frequency
FMOD = Fractional N Modulus
Since FMC is the same for both 6.25 kHz and
10 kHz the loop dynamics are very similar and the
same loop filter values can be used.
3.2.2 B-WORD
The B-Word is 24-hits long (see Figure 3-2). It
contains the Address. Charge Pump setting factor
(CN), Binary Acceleration factors (CK, CL), and
Prescaler Type (PR).
The Charge Pump Current setting (CN) could be
changed on a channel-by-channel basis for ultimate
rejection of the Fraction N spurious responses close
into the carrier frequency. The 3474 synthesizer has
an adjust (R855) for the fractional compensation cur-
rent. The factory preset value will allow CN to be set
to the following ranges:
Frequency in a Band CN
Lowest TX 86
Highest TX 90
Lowest RX 96
Highest RX 100
The value of CN should be interpolated for fre-
quencies between the band edges. With these recom-
mended values of CN, the transceiver should have the
fractional spurs minimized far below the levels needed
to make ETSI 70 dB adjacent channel RX or TX
specifications.
Example:
Model 3474-530 is a 450-466 MHz transceiver.
458 MHzTXCN=88 01011000 Binary
458 MHz RX CN = 98 01100010 Binary
3.2.3 A-WORD
The A-Word must be sent last (see Figure 3-3).
The A-Word contains new data for the loop dividers
and is programmed for every channeli The A-Word
can be a 24-bit or 32-bit word depending on the state
of the flag LONG in the DWord. The 24-bit woFcl
(A0) is sent ifLONG=0 and the 32-bit word (A1) is
sent if LONG=1. The extra 8-hits in Al arethe CN
charge pum smimd
mime—55:1, but afier that only the A1 word
needs to he sent.
January 1996
3-I Part No. 001-3474-001
PROGRAMVHV-
Busy z 3 4 5 e 7 u 9 m n u u |4 |5 vs H n! w 20 z‘ 27 23 u 25 25 27 25 19 39 st 3:
a [mono/10Aomanonoucunnumo/nunuun/v (IMO/vuano/‘n/VDMDH UN M an an on on w an
; . ,
Auuwtss V
W Mm wz cm
(numaza OF mw ulerER cmzs {Nuuszfi or um mvmm cchEs (cum Duw cuwwem smma
wnsu masons-v MDDULUS = 54) mn- owzscuzw uonums - 55) cmum BEPEanm)
no or A0 WORD
Figure 3-3 A—WORD
(«4377 (7ng
no
IA.‘
MSB LSE
1 32
HIHHHH H (HM
NM?
A10Nr Nm CM
nu) ma
HHHllIHI IHH
$4
| A
H I \ HHH‘ ‘I \
NM2 4—‘PR-F
A00 nr Nm
NM} NMZ <—-PR=V0‘
HHlH ¥ NH!
W1 ‘l ‘
Evoonoouu c~ v\c»< a. PR
Hi
‘ i \ i
Cvoovy NA ‘pn o
11 I
x ‘ .
“H ‘\ lrl
Dwowo‘ NR lsuwsnz.“°
i ow
‘ ‘ c
1‘ M ‘ 1\,\°
24
Figure 3—4 SERIAL INPUT WORD FORMAT
January I996
3-3 Pan No. 001-3474-001
SECTION 4 CIRCUIT DESCRIPTION
4.1 GENERAL
4.1.1 INTRODUCTION
The main subassemblies of this transceiver are
the RF board, VCO board, TCXO. A block diagram
of the transceiver is located in Figure 4-1.
The VCO board is enclosed by a metal shield and
soldered directly to the RF board. The VCO is not
serviceable.
The 3474 is available with a reference oscillator
stability of 11.5 PPM. The TCXO (Temperature
Compensated Crystal Oscillator) is soldered directly
to the RF board.
4.1 .2 SYNTHESIZER
The VCO (voltage-controlled oscillator) output
signal is the receiver first injection frequency in the
Receive mode and the transmit frequency in the
Transmit mode. The first injection frequency is 52.95
MHz above the receive frequency. The frequency of
this oscillator is controlled by a DC voltage produced
by the phase detector in synthesizer chip USO].
Channels are selected by programming counters
in USOI to divide by a certain number. This program-
ming is performed over a serial bus formed by the
Synth Clock, Synth Enable, and Synth Data pins of
1201. This programming is performed by user sup-
plied hardware and software (see Section 3)
The frequency stability of the synthesizer in both
the receive and transmit modes is established by the
stability of the reference Oscillator described in the
preceding section. These oscillators are stable over a
temperature range of -30° to +60° C (-22° to +140” F).
4L]
4.1 .3 RECEIVER
The receiver is a double-conversion type with
intermediate frequencies of 52.95 MHZ / 450 kHz.
Two helical bandpass filters reject the image, half IF,
injection, and other unwanted frequencies. A four-
pole crysz filter enhances receiver selectivity
4.1.4 TRANSMITTER
The transmitter produces a nominal RF power
output of 2W adjustable to 500 mW (AXXO) or 500
mW adjustable to 75 mW (with Low Power Kit). Fre-
quency modulation of the transmit signal occurs in the
synthesizer, Transmit audio processing circuitry is
contained in the customer~supplied equipment.
4.2 SYNTHESIZER
4.2. 1 INTRODUCTION
A block diagram of the synthesizer is shown in
Figure 4-1 and a block diagram of Synthesizer IC
U80] is shown in Figure 4-2. As stated previously,
the synthesizer output signal is produced by a VCO
(voltage controlled oscillator). The VCO frequency
is controlled by a DC voltage produced by the phase
detector in USO] . The phase detector senses the phase
and frequency of the two input signals and causes the
VCO control voltage to increase or decrease if they
are not the same. The VCO is then "locked" on fre-
quency.
Programming of the synthesizer provides the data
necessary for the internal prescnler and counters. One
input signal is the reference frequency. This frequency
is produced by the 17.5 MHz reference oscillator
(TCXO). Tire other input signal is the VCO
frequency.
January [996
Part No. 001-3474-001
CIRCUIT DESCRIP'I ION
cm -
nan 7 sum W . am... we.“ _- vm,
sinus -
m m m, e; m
V” '— (I 2 if f 5 “cool “03
— . , H mm .
' — Rf
rm _ c“ _ m
5 MIL
ourwr
mm
a.“ m,
n_. must 4.—
nmm CL _. m
5. T semi-w
L um Emit
—. mum
is! Sfllbv W”
M. if? . C,
l —i i i ‘
mm, mm um u ., a was
can-ct ' m]
n».
at
Sim. _ n
—- mum?! l
mu Auxlunv
auteur
4 2 mm s m
MINUAIV NW
0—- wast:
H ““ DUEC'DI
T J a ——t— 4»th
Am -{ “gt/1m mum amuse
l l
‘bflA “SSA
Figure 4-2 USO] SYNTHESIZER BLOCK DIAGRAM
42,2 VOLTAGE-CONTROLLED OSCILLATOR quuencLConmLandModummn
Oscillator-£28503
The VCO is formed by Q850, several capacitors
and varactor diodes, and a ceramic resonator. lt oscil-
lates at the transmit frequency in transmit mode and
first injection frequency in the receive mode (approxi-
mately 450 MHZ in transmit and 500 MHz in receive)
Biasing of 0850 is provided by R862, R867 and
R868 An AC voltage divider formed by C859, C861
and C862 initiates and maintains oscillation and also
matches 0850 to the tank circuit. The ceramic resona»
tor is grounded at one end to provide shunt inductance
to the tank circuit.
The VCO frequency is controlled in part by DC
voltage across varactor diodes CR854, CRSSS, CR856
and CR85L As voltage across a reverse-biased varac-
tor diode increases, its capacitance decreases, There-
fore. VCO frequency increases as the control voltage
increases, CR854/CR855 and CR356/CR851 are par-
alleled varactors to divide the capacitance and
improve liniarity. The varactors are biased at 72V to
adjust to the voltage output of U80l. The control line
is isolated from tank circuit RF by choke L85l and
L854 and decoupling capacitor C854. The amount of
frequency change produced by CR854/CR855/CR856/
CR851 is controlled by series capacitor C853,
January I996
Part No. 00l-3474-00]
low impedance to RF; and when it is reverse biased, it
presents a very high impedance. The capacitive leg is
switched in when in transmit and out when in receive,
When 1201, pin 4 is high in receive, (2834 is
turned off, Q101 is tun-ted on and the collector voltage
goes low, A low on the base of Q102 turns the tran-
sistor on and the regulated +5.5V on the emitter is on
the collector for the receive circuitry. With a low on
the base of Q831 the transistor is off and the collector
is high. With a high on the collector of 0831 and a
low on the emitter of 0834, this reverse biases CR850
for a high impedance.
The capacitive leg is formed by C85], CRBSO,
C852 and C876. When 1201, pin 4 is low in transmit,
Q834 is turned on and a high is on the emitter, QIOl is
turned off and the collector voltage goes high. A high
on the base of Q102 turns the transistor off and the
regulated +5.5V is removed from the receive circuitry.
With a high on the base of Q831 the transistor is on
and the collector is low. With a low on the collector
on831 and a high on the emitter of Q834, this for-
ward biases CRSSO and provides an RF ground
through C851 and C852/C376 are effectively con‘
nected to the tank circuit. This decreases the resonant
frequency of the tank circuit.
4.2.x SYNTHESIZER INTEGRATED CIRCUIT
(user)
Inn'oduction
Synthesizer chip USO] is shown in Figure 4-2.
This device contains the following circuits: R (refer-
ence), Fractionalll, NM] and NMZ; phase and lock
detectors, prescaler and counter programming cir-
cuitry. The basic operation was described in Section
4.2. I .
Channelfmgmmming
Frequencies are selected by programming the R.
Fractional-N, NMl and NM2 in U801 to divide by a
certain number. These counters are programmed by a
user supplied programming circuit. More informa-
tion on programming is located in Section 3.
LIKL.LIA IILDL I\|r Il\l w
As previously stated, the counter divide numbers
are chosen so that when the VCO is oscillating on the
correct frequency, the VCO—derived input to the phase
detector is the same frequency as the reference oscilla-
tor-derived frequency.
The VCO frequency is divided by the internal
prescaler and the main divider to produce the input to
the phase detector.
4.2.9 LOCK DETEC'I'
When the synthesizer is locked on frequency, the
SY'NTH LOCK output ofU801, pin 18 (1201, pin 7) is
a high voltage. Then when the synthesizer is
unlocked, the output is a low voltage. Lock is defined
as a phase difference of less than 1 cycle of the
TCXO.
43 RECEIVER CIRCUIT DESCRIPTION
4.3.1 HELICAL FILTER (ZZOI), RF AMPLIFIER
(Q201)
Capacitor C201 couples the receive signal from
the antenna switch to helical filter Z201. (The antenna
switch is described in Section 4.4.5.) Z201 is a band-
pass filter tuned to pass only a narrow band of fre-
quencies to the receiver. This attenuates the image
and other unwanted frequencies. The helicals are fac-
tory set and should not be tuned.
Impedance matching between the helical filter
and RF amplifier 0201 is provided by C203, C204
and L201, 0201 amplifies the receive signal to
recover filter losses and also to increase receiver sen-
sitivity. Biasing for (2201 is provided by R201, R202
and R203; and C208/C209 provide RF bypass. CR201
protects the base-emitterjunction of Q201 from exces-
sive negative voltages that may occur during high sig-
nal conditions. Additional filtering of the receive sig-
nal is provided by Z202. L202, and C205 provide
impedance matching between 0201 and 2202. Resis-
tor R204 is used to lower the Q of L202 to make it less
frequency selective.
January 1996
Part No. 00l-3474-00l
Limiter/Amplifier
The output of 2241/1242 is applied to a limiter-
amplifier circuit in U24l. This circuit amplifies the
450 kHz signal and any noise present; then limits this
signal to a specific value. When the 450 kHz signal
level is high, noise pulses tend to get clipped off by
the limiter; however, when the 450 kHz signal level is
low, the noise passes through. C242, C243 decouple
the 450 kHz signal.
Quadrature Detector
From the limiter stage the signal is fed to the
quadrature detector. An external phase-shift network
connected to pin 8 shifts the phase of one of the detec-
tor inputs 90“ at 450 kHz (all other inputs are
unshifted in phase). When modulation occurs, the fre-
quency of the IF signal changes at an audio rate as
does the phase of the shifted input, The detector,
which has no output with a 90“ phase shifi, converts
this phase shift into an audio signal. L242 is tuned to
provide maximum undistorted output from the detec—
tor, R242 is used to lower the Q of L242. From the
detector the audio and data signal is fed out on pin 9.
Audio/Data Amplifier
The audio/data output of U241 on pin 9 is fed to
the audio amplifier U261. U261 amplifies the
detected audio/data signal and shifis the DC bias level
to 2.5V. The gain is set at approximately 1.5 by
R26l/R262. R263 and R264 provide a 1.9V DC ref-
erence bias voltage. The audio output of U261 is
applied to J201, pin 13.
Receive Si nal Stren h Indicator RSSI
U241, pin 13 is an output for the RSS] circuit
which provides a current proportional to the strength
of the 450 kHz IF signal. The voltage developed
across R241 is applied to 1201, pin 12.
4.4 TRANSMITTER CIRCUIT DESCRIPTION
4.4.1 BUFFER (Q85 1)
The output signal is applied to a 50-ohm pad
formed by R851. R852, and R853. This pad provides
attenuation and isolation. Q851 provides amplifica-
CIRCL'I'I DLbCRII’I IUN
tion and also additional isolation between the VCO
and transmitter. BiaSing for this stage is provided by
R854, and decoupling of RF signals is provided by
C852 . Impedance matching with the transmitter is
provided by L501 and C502, and impedance matching
with the receiver is provided by L301, C302,
4.4.2 PRE-DRIVER (Q501), DRIVER (Q521)
Pro-driver Q501 is biased class A by R501 and
R502 and R506. L501 and C502 match Q501 to
0851. C520 and C508 bypass RF from the DC line,
and R503 provides supply voltage isolation. R507 ties
the +7.5V supply to the circuit for high power applica-
tions and R508 ties the circuit to +5V for low power
applications. Impedance matching between 0501
and 0521 is provided by L502, L503 and C511. R504
and C504 provide negative feedback to prevent
oscinllation.
Driver Q521 is biased nearly Class C by R52]
and R522. Impedance matching Willi 0541 is pro-
vided by L521 , C525, C527, L522 and C526.
4.4.3 -5V POWER CONTROL SUPPLY
The 17.5 MHz from the TCXO is coupled
through C902 to Q901. Bias for Q901 is provided by
R903, R904, R901, R902 and R905. C901 and C903
provide RF decoupling. The amplified sigial rectified
by CR901/CR902 to produce 6 -5V DC source. C909
stabilizes the voltage level and C910 and C91] pro-
vide RF decoupling. This -5V source is used in the
transmit power control circuit U542.
4.4.4 FINAL (0541), POWER CONTROL (U542)
Q541 is biased for Class C operation. The output
is matched to the low-pass filter by L541, C552, and
several capacitors. The supply voltage is isolated
from RF by ferrite bead EF541.
Power control is provided by U542. The 5.5V
transmit supply is passed by U542 to power adjust
R542. The other end of R542 is the rectified -5V from
Q901. This negative voltage is required when low
power is used to pinch off 0541 to the required out-
put.
January 1996
Part No. 001-3474-001
SECTION 5 SERVICING
5.1 GENERAL
5.1.1 PERIODIC CHECKS
This transceiver should he put on a regular main-
tenance schedule and an accurate performance record
maintained. Important checks are receiver sensitivity
and transmitter frequency, modulation, and power out-
put. A procedure for these and other tests is located in
Section 6. It is recommended that transceiver perfor-
mance be checked annually even though periodic
checks are not required by the FCC. During the first
year, make an additional check or two to ensure no
TCXO frequency drifting has occurred.
5.1 .2 SURFACEMOUNTED COMPONENTS
A large number of the components used on the
transceiver board are the surface-mounted type. Since
these components are relatively small in size and are
soldered directly to the PC hoard, care must be used
when they are replaced to prevent damage to the com-
ponent or PC board, Surface—mounted components
should not be reused because they may be damaged by
the unsoldering process.
5.1.3 SCHEMATIC DIAGRAMS AND COMPO-
NENT LAYOUTS
Schematic diagrams and component layouts of
the PC boards used in this transceiver are located in
Section 8. A component Iocator guide is also pro
vided to aid in component location.
5] A REPLACEMENT PARTS LIST
A replacement pans list with all the parts used in
this transceiver is located in Section 7. Parts are listed
alphanumerically according to designator. For infor—
mation on ordering parts, refer to Section 1.8.
5.l.5 TCXO MODULE NOT SERVICEABLE
The 115 PPM TCXO module is not field ser-
viceable. Pan changes require a factory recalibration
to ensure that the oscillator stays within its 11.5 PPM
tolerance.
5»!
5.2 SYNTHESIZER SERVICING
5.2.l INTRODUCTION
When there is a synthesizer malfunction, the
VCO is not locked on frequency. When an unlocked
VCO is detected by the lock detector circuit, USOI,
pin l8 goes low (OV).
NOTE.“ The user-supplied circuitry must disabIe the
transmitter and receiver when an out-af-luck condi-
lion is indicated.
When the VCO is unlocked, the fR and fv inputs
to the phase detector are usually not in phase (see Sec-
tion 4.1.2). The phase detector in USOl then causes
the VCO control voltage to go to the high or low end
of its operating range. This in turn causes the VCO to
oscillate at the high or low end of its frequency range.
As shown in Figure 4-1, a loop is formed by
vco 0850, amplifier (2851/0352, and the RF [N of
U801. Therefore, if any of these components begin to
malfunction, improper signals appear throughout the
loop. However, correct operation of the counters can
still be verified by measuring the input and output fre—
quencies to check the divide number.
Proceed as follows to check the synthesizer I/O
signals to determine if it is operating properly.
5.2.2 REFERENCE OSCILLATOR
Check the signal at USOl, pin 8. It should be
17.5 MHz at a level ofapproximately 1.5V P-P. lfthe
TCXO module is defective, it is not serviceable and
must be replaced with a new module as described in
Section 5.1.5.
5.2.3 VCO
Output Level
The output level of Q853 can be measured with
an RF voltmeter or some other type of high impedance
meter. The minimum level afier a power splitter at
RSSI should be -10 dBm.
January 1996
Part No. 001-3474-001
5.3.3 RF AMPLIFIER (Q201) AND FIRST MIXER
(Q221)
Refer to the schematic diagram for signal levels
and test points for measuring levels,
5.3.4 RF AND IF AMPLIFIERS, FIRST MIXER
Check the DC voltages shown on the schematic
diagram. If they are normal, inject a signal at the
input and output of each stage using a .01 uF coupling
capacitor. If the stage is producing gain, the injection
level on the input of a stage should be less than that
required on the output to produce the same SINAD at
the receive output.
5.4 TRANSMITTER SERVICING
5.4.1 SUPPLY VOLTAGES AND CURRENT
Measure the supply voltages on the following
pins of interface connector JZOI:
Pin 2 - 7.5V DC
Pin 3 - 75V DC
Pin 4 — 0,0V DC (while transmitting)
Pin 5 - 5.0V DC
Pin 6 - 25V DC Transmit In/1.5V P»P max
Place a DC ammeter in the supply line to the
transceiver and the following maximum currents
should be measured:
PinZ - 650 mA
Pin 3 — 250 mA
Pin 5 - 12 mA
nusuRE
cunsm Aun
voumr
mu to
sECVton 5.4
unsung nr
Down ouvruv
®m
no
mm in
5mm a.“
(szcww 51.4
mm msrs nu) ‘
m: MRNESS cumzcuons
our DEVIAYIQN
SEKV ICth.
cum nr sucrs
cum rem
amusv an
cmnnt vexo
. 01th mm
H am. an a
cum vmurm
(semen s 1.2)
Vnnsumza
or
Figure 5-2 TRANSMITTER SERVICING
FLOWCHART
January I996
Part No. 001~3474~00|
SECTION 6 ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
6.1 GENERAL
Receiver or transmitter alignment may be neces-
sary if repairs are made that could affect tuning.
Alignment points diagrams are located in Figure 6-3
or component layouts are located in Section 8.
Fabricate test cables by referring to Figure 2-1.
This cable should include power and ground, a trans-
mit keying switch that shorts the keying line or
ground, data input and data output. The test setup
must apply the various supply voltages and load the
synthesizer with channel information.
612 D13474 TRANSCEIVER ONLY
6.2.1 FREQUENCY AND CONTROL LINE VOLT-
AGE CHECK
1. Connect the test setup shown in Figure 6-1. Set the
power supply for +7,5V DC. See Figure 2-1 for
interface cable.
2. Load the synthesizer with the channel frequency
(see Section 3.2).
3. Connect a DC voltmeter at the junction of R808/
C815 to measure the VCO control line voltage for a
meter reading of20.50 - £4.90V DC (see Figure 6-
3).
4. Key the transmitter,
5. Measure the VCO control line voltage for a meter
reading of20.75 ~ $5.00V DC
6. Unkey the transmitter.
6.2.2 2W TRANSMITTER POWER ALIGNMENT
1. Connect the test setup shown in Figure 6-1. A DC
emmeter capable ofmeasuring up to 1 5A should be
installed in the supply line.
2, Load the synthesizer with the center channel
frequency.
3. Key the transmitter and make sure that the supply
voltage at the RF board is 7.5V.
(Dir not transmit for extended periods.)
4. Adjust C553 counterclockwise for minimum
current.
5. Connect a voltmeter to the junction of R542/R543,
6. Adjust R542 clockwise for 2.30V DC (+0/-0.1V
DC}
7. Readjust C553 counterclockwise for minimum
current.
8. Tune C527 clockwise for maximum power.
9. Tune C553 clockwise for 2.0W (10.1W). Current
should be less than 900 mA. (Power output should
be 1.6-2.4W and current less than 900 mA from
403-512 MHz.)
10.Monitor the frequency with a frequency counter and
adjust TCXO (YBOI) for the channel frequency
thO Hz.
at minim
o if] u a O
5:
. u couwntcutms
suvicl mm
5-1. so ow nmmw
. ' |\
MHLAIIQN
Amtun
Figure 6-1 TRANSMITTER TEST SETUP
January l996
Part No. 00l~3474~001
2. Measure the receive current drain. (Typically cur-
rent should be <80 mA.)
3. Preset tuning slugs of L222/L224 to the full clock-
wise position (slug in all the way).
4. Preset (2232 to center position (slot in-line with axis
of part).
5, Readjust L224 counterclockwise 2 turns.
6.2.6 IF AND AUDIO ADJUSTMENTS
1. Load the synthesizer with the channel frequency.
2. Set the RF signal generator for this frequency with
a 1 kHz tone (modulated output shown below) at a
level of —47 (BM (1000 uV) and inject into JSOl,
1.5 kHz deviation (-X10 1215 kHz BW Radio)
2.4 kHz deviation (-X20 20.0 kHz BW Radio)
3.0 kHz deviation (-X30 25.0 kHz BW Radio)
NOTE: Maintain these deviation levels throughout
the test when measuring AC levels, SINAD and %
distortion.
3. Adjust L242 for 2.5V DC (10.05V DC) at the
receive audio output.
4. Set the RF signal generator level to -105 dBm,
"unmodulated".
5. Set the generator frequency 3 kHz below channel
center (-Xl 0) or 5 kHz below channel center (—X20/
-X3 0).
6-3
ALIGNMENT PROCEDURE AND PERl‘ORMAhLL
6. Adjust C232, then L222 for peak RSSl voltage.
NOTE: Use ZVscaIe on DVM
7. Set the RF signal generator frequency back to chan-
nel center at -47 dBm with standard deviation level.
8. Adjust L224 for minimum distortion.
9. Set the RF signal generator to - 105 dBm, "unmodu-
lated".
10.Adjust L222 for peak RSSl voltage.
NOTE: Use ZVscaIe on DVM
l 1.Adjust deviation to the level in Step 2. Record the
RMS voltage level RMS. (Typically 300
mV 150 mV.)
12.Record the percent distortion %. (Typi-
cally 00305 510-3601-101
C310 .1uF¢5%X7R1206 510-3609-104
c 311 001 “F 110?» x73 0603 5103675402
c 312 0047 pF 110% x73 0305 510—3605-472
c 313 001 111: 110% x73 0603 510-3675-102
c 814 1 “F 16V SMD tantalum 510-2625-109
c 315 0047 (113 510% X7R 0305 5103605472
c 317 63 pF t5% NPO 0603 510-3674-680
c 313 1 pF 16V SMD tantalum 510-2625-109
c 319 3.9 pF 50.1% NPO 0603 510-3673-399
c 331 01 111: 110% x73 0603 510-3675-103
c 332 01 “F 11070 x73 0603 510-3675-103
c 833 63 pF 15°43 NPO 0603 510-3674-630
c 334 4.7 pF 10V SMD tantalum 510-2624-479
January 1996
Pan No. 001-3474-001
SYMBOL
NUMBER DESCRIHIQN
L 541
L 561
L 562
L 563
L 564
L 565
L 566
L801
L851
L901
I8.5 nH 5-tum SMD air core
[805 nH S-tum SMD air core
35.5 nH 9-mm SMD air core
355 nH 9-mm SMD air core
185 711-1 5-tum SMD air cure
1 111-1 SMD inductor
12.5 nH SMD air core
39 pH i10% SMD NHY0805
1 011-1 SMD inductor
.68 pH SMD inductor
MP80] VCO can
MPKOZ Top shield, transmitter
MPBOS Bottom shield, transmitter
MPBO4 Bottom shield
MPBOS Bottom shield
MPSOG Crystal filter shield
PC001
Q 101
Q 102
Q 103
Q 201
Q 221
Q 222
Q 301
Q 401
0501
Q521
0541
mm
0832
Q 833
Q 834
Q 1351
090]
PC board
NPN amplifier SOT-Z3
PNP digital w/res SOT-23
NPN amplifier SOT-23
NPN low noise SOT-23
VHF/UHF amp SOT-23
Si N-chnl J'FET SOT
NPN low noise SOT—23
VHF/UHF amp SOT-23
NPN low noise SOT-23
NPN .2-2 GHz SO-S
RP FET
NPN amplifier SOT-23
Si NPN gen purp sw/amp
VHF/UHF amp SOT-23
PNP digital w/res SOT-23
Bi-polar MMIC SOT-MB
VHF/UHF amp SOT-23
PART
MEMBER
542-0030-005
542-0030-005
542-003 0-009
542-003 0-009
542-003 0-005
542-9001-109
542-003 0-004
542-9003-397
542-9001-109
542-9001-688
017-2225—75 l
017-2225-761
017-2225—762
017-2225-763
017-2225—764
017-2225-699
035-3474-030
576—0003-61 6
576-0003-621
576-0003-616
576-0003-636
576-0003-634
576-0006—019
576—0003-636
576—0003-634
576-0003-636
576-0003-604
576-0006-450
576-0003-616
576-0001-300
57600034534
576-0003-621
576-0003-638
576-0003-634
SYMBOL
MEMBER DEMON
R 120
R 121
R 201
R 202
R 203
R 204
R 222
R 223
R 224
R 225
R 226
R 227
R 228
R 229
R 230
R241
R242
R243
R261
R 262
R 263
R 264
R 265
R 301
R 302
R 303
R 304
R 401
R 402
R 403
R 404
R 501
R 502
R 503
R 504
100k ohm 15% .063W 0603
330k ohm tS‘Vo .063W 0603
32 ohm ¢5% mm 0603
16k ohm 3504, mm 0603
3.9k ohm 15% .063W 0603
1130 ohm mm mm 0603
330 ohm 15% .063W 0603
22k ohm 1m .063W 0603
1k ohm ¢5%1063W 0603
15k ohm :5% .063W 0603
470 ohm 15% mm 0603
270 ohm mm mm 0603
100 ohm 15% .063W 0603
330 ohm mm .063W 0603
2.7k ohm 15% mm 0603
(12.5 kHz BW)
1.8k72hm “rm :063w 0603
(2025 kHz BW)
56k ohm 15% .063W 0603
27k ohm mm mm 0603
270 ohm 19/1. mm 0603
200k ohm 350/11 .063W 0603
(12.5 kHz BW)
120k ohm fi%’.063w 0603
(20 kHz BW)
100k ohm i5% MW 0603
(25 kHz BW)
100k ohm 1m 063W 0603
10k ohm 15% mm 0603
18k ohm ¢5% .063w 0603
10 ohm 15% mm 0603
3.3k ohm 15%1063W 0603
1.8k ohm 15% .063W 0603
180 ohm 15% .063W 0603
1k ohm 15% .063W 0603
10 ohm 15% .063w 0603
15k ohm t5% .063w 0603
2.7k ohm 15% ,063W 0603
330 ohm t5%1063W 0603
2.2k ohm tS‘Va 063W 0603
2.2k ohm 15% 063W 0603
10 ohm t5% .063W 0603
560 ohm 15% .063W 0603
i‘AKlauol
PART
NUMBER
569—0155-104
569—0155-334
569-0155-820
569-0155-163
569-0155-392
569-0155-181
569-0155-331
569-0155-223
569-0155-102
569-0155-153
569-0155-471
569-0155-271
569-0155-101
569-0155-33]
569-0155-272
569-0155-182
569-0155-563
569-0155-273
569-0155-271
569-0155—204
569-0155- 124
569-0155-104
569-0155-104
569-0155-103
569-0155-183
569-0155-100
569-0155-332
569-0155-182
569-0155-181
569-01 55-102
569-0155-100
569-0155-153
S69-0l55-272
569-0155-331
569-0155-222
569-0155-222
569-0155-100
569-0155-561
January 1996
Pan Ne. 001-3474—001
SYMBOL PART
NHMBER DESCRIHIDN NHMBER
Z 202 443 MHz helical filter SMD 532-1005-042
Z 202
Z 202
2221
2221
Z 222
Z 222
Z 241
Z 241
2241
Z 242
Z 242
Z 242
C 850
C 851
C 852
C 853
(435—451 MHz)
459 MHZ helical filter SMD
(450466 MHz)
472 MHz helical filter SMD
(464-480 MHz)
52.95 MHz 4-130]: 8 kHz BW
(12.5 kHz bendmm
52.95 MHz 4-pole 15 kHz BW 532~0009-009
(20 kHz and 25 kHz bandwidth)
52.95 MHz 4-pole 8 kHz BW 532-0009-011
(12.5 kHz bandwidth)
52.95 MHZ 4-pole 15 kHz BW 532-0009—009
(20 kHz and 25 kflngandwidm)
450 kHz 9 kHz BW 532-2004-015
(12.5 kHz bandwidth)
Ceramic data filter
(20 kHz bandwidth)
450 kHz, 20 kHz BW
(25 kHz bandwidth)
532-1005-044
532-1005-045
532-0009~011
532-2004-016
532-2004—01 3
450 kHz 9 kHz BW 532-2004-015
(12.5 kHz bandwidth)
Ceramic data filter 532-2004—016
(20 kHz bandwidth)
450 kHz, 20 kHz BW 532—2004-013
(25 kHz bandwidth)
VCO
PART NO, 023-3474—X40
63 pF 05% N00 0603 510-3674—680
91 pF 1004. N00 0603 510-3673-919
(403.419 MHz)
8.2 150 1-0.I%NPO 0603
(419-466 MHz)
63 p0 r5% NPO 0603
(466-512 MHz)
7.5 pF 50.194 N00 0603
12 pF 194. N00 0603
(403-419 MHZ)
10 pF t5% N00 0603
(419-451 MHz)
9.1 pF $0.1?» N00 0603
(464-480 MHz)
8.2 pF tO.l"/0 N00 0603
(435451 MHZ)
8.2 pF 30.104. NPO 0603
(480496 MHz)
510-3673-829
510-3674-680
510-3673»759
510-3674-120
510-3674—120
510-3673-919
510-3673-829
510-3673-829
7-7
SYMBOL
HUMMER DESCRIZIIQH
C 854
C 855
C 856
C 858
C 859
C 859
C 860
C 861
C 862
C 863
C 864
C 865
C 867
C 868
100 pF 1m NPO 0603
68 p0 15°41 NPO 0603
2.7 p1= 10.1%NPO 0603
68 pl" 15% NPO 0603
3.2 pF 20m NPO 0603
(403-419 MHz)
7.5 pr 10m N00 0603
(419466 MHz)
6.8 pp $0.04. N00 0603
(464-480 MHz)
8.2 p0 10m N00 0603
(480—496 MHz)
1 pF 10m N00 0603
(403—4 19/435-451 MHz Only)
8.2 pF 50m. N00 0603
(403435 MHz)
6.8 pF 10.1% NPO 0603
(435-451 MHz)
3.2 pF 10.176 N00 0603
(450—461 MHz)
5.6 pF 10.1% NPO 0603
(464—480 MHz)
6.8 pF 1004 N00 0603
(430-496 MHz)
6.8 pF 00,1144. NPO 0603
100 150 10.194. N00 0603
(403419 MHz)
63 pF :5% N00 0603
(419-512 MHz)
10 pF tO.l% N00 0603
100 pF 50. 1% N00 0603
(403-419 MHz)
68 pF 196 N00 0603
(419-512 MHz)
100 pF 50.104. N00 0603
(403-419 MHz)
68 pF x50“ N00 0603
(419-512 MHz)
100 pF 1004. NFC 0603
(403-419 MHz)
68 pF 15°45 NPO 0603
(419-512 MHz)
2.4 pF i0.l% NPO 0603
(403-419 MHz)
2.2 pF 10.l% N00 0603
(419435 MHz)
1.3 pF 10m. N00 0603
(435-466 MHz)
PARTS L151
PART
N UMBER
510-3674-101
510»3674-680
510»3673-279
510-3674-680
51036734829
510—3673-759
510-3673-689
510-3673-829
510-3673-109
510-3673-829
510-3673-689
510-3673-829
510-3673-569
510-3673-689
510—3673-689
510-3673- 101
510-3674-680
510-3673'100
510-3673-101
510-3674-680
510-3673-101
510-3674-680
5 1 0»3673- 101
510-3674-680
510-3673—249
510-3673-229
510-3673-189
January 1996
Pan No. 001-3474-001
SYMBOL PART
NUMBER DESCRIPTIQN NUMBER
Coaxial xmit line 1095 MHz 542-9004-007
(480—496 MHz Only)
Coaxial xmit line I 180 MHz 5429004408
(496-512 MHZ Only)
7-9
PAR lb Llsl
January 1996
Pan No, OOlv3474-001
PARTS LIST
This page intentionally lefi blank.
January 1996
Pan No. 001-3474—00l 7-10
PARTS LlST
SYMBOL
NUMBER DESCRLEILIDN
C 870
C 871
C 873
C 874
C 874
C 876
C 877
C 878
CR850
CR851
CR852
CR853
CR854
CR855
CR856
L851
L852
L 853
L 854
January
Pan No.
142 pF 10.106 NPO 0603
(464—480 MHz)
1.8 pF $0.l% NPO 0603
(480-496 MHz)
1 pF 10m NPO 0603
100 pF zm NPO 0603
100 pF ¢5% NPO 0603
3.3 pF 10m. NPO 0603
(403419 MHz)
3.3 pF 30m NPO 0603
(419-435 MHz)
3.3 pF 10m NPO 0603
(435-496 MHz)
10 pF 10.104 NPO 0603
(403-419 MHz)
9.1 pF 304 1% NPO 0603
(419-435 MHz)
812 pF 10m, NPO 0603
(435-496 MHz)
1.2 pF 10.1% NPO 0603
(403435 MHz)
1 pF 10m NPO 0603
(435-496 MHz)
10 pF z0.1% NPO 0603
(403.435 MHz Only)
Pin switch diode SOT-23
Vamctur SOD-323 1313535
Varacior diode SOD-123
Vamctor diode SOD-123
Varacwr SOD-323 BB535
Vamctor SOD-323 BB535
Varactor 500323 BB535
82 nH i10% SMD 0805
82 nH $10% SMD 0805
(43 5-466 MHz)
150 nH 110% SMD 0805
(464-480 MHz)
22 nH i10% SMD 0805
(403—480 MHZ)
l8 nH 110% SMD 0805
(480-512 MHZ)
82 nH tIO‘Vn SMD 0805
(43 5-466 MHz)
150 nH 110V» SMD 0805
(464-480 MHz)
1996
001-3474-001
PART
NUMBER
510-3673-129
510-3673-189
SIG-3673409
510-3674-101
5] 0-3674- 101
510-3673—339
510-3673-339
510-3673-339
510-3673-100
510-3673-919
5103673-829
510-3673-129
510-3673-109
510-3673-100
523-1504-001
523-5005-022
523-5005-020
523-5005-020
523-5005-022
52345005-022
523-5005-022
542-9003-827
542-9003-827
542-9003-158
542—9003-227
542-9003- I 87
542-9003-827
542-9003-158
SYMBOL PART
MEMBER DEMON NHMBER
L 855 56 nH inductor LL2012 F56N 542-9003-567
L 856 27 nH $10% SMD 0805 542-9003-277
(403-435 MHz)
22 n}! 110% SMD 0805 542—9003-227
(435—480 MHz)
18 nH th% SMD 0805 542-9003-187
(480-512 MHz)
L 861 12 nH inductor LL2012 F] ZN 542-9003-l27
(435-480 MHz)
15 nH inducmr LL2012 FlZN 542-9003-157
(480-512 MHz)
Q 850 NPN transistor NE85619 576-0003-651
Q 851 NPN transistor NE85619 576-0003-651
Q 852 NPN transistor NE85619 576-0003-651
Q 853 NPN transistor N585619 576-0003-651
R 851 10k ohm 15% 063W 0603 569-0155-103
R 852 47k ohm 15% 063W 0603 569-0155-473
R 853 47k ohm t5% 063W 0603 569—0155-473
R 854 10 ohm 15% .063W 0603 569-0155-100
R 856 10 ohm 1:5% 063W 0603 569-0155-100
R 857 6.811 ohm t5% .063W 0603 569-0155-682
R 858 1k ohm 15% .063W 0603 569-0155-102
R 862 10k ohm i5% .063W 0603 569-0155-103
R 863 10 ohm 15% 063W 0603 569-0155-100
R 864 10k ohm 15% .063W 0603 569-0155-103
R 865 10k ohm 15% 063W 0603 569-0l55-103
R 866 470 ohm tS% .063W 0603 569-0155-47]
R 867 12k ohm tS% .063W 0603 569—0155-123
R 868 390 ohm iS‘Va 063W 0603 569-0155-391
R 869 270 ohm i5% .063W 0603 569-0155-27]
R 870 IE ohm i5% .063W 0603 569-0155-180
R 871 3.9k ohm 15% .063W 0603 569-0155-392
R 872 1.8k ohm 15% .063W 0603 569-0155-182
R 874 680 ohm £5% .063W 0603 569-0155-681
R 875 270 Ohm 15% .063W 0603 569-0155-271
Z 850 Coaxial xmit line ind 835 MHZ 542-9004-002
(403-419 MHZ Only)
Coaxial xmit line ind 885 MHzS42—9004‘003
(419-435 MHz Only)
Coaxial xmit line ind 935 MH1542-9004~004
(435—451 MHz Only)
Coaxial xmil line ind 985 MH1542-9004-005
(450-466 MHZ Only)
Coaxial xmil line 1035 MHZ
(464—480 MHZ Only)
542-9004-006
PARTS LIST
SYMBOL
MEMBER DESCRIKIJDN
R 506
R 521
R 522
R 524
R 541
R 542
R 543
R 546
R 547
R 548
R 549
R 562
R 563
R 564
R 801
R 802
R 804
R 805
R 806
R 807
R 808
R 810
R 811
R 812
R 813
R 831
R 834
R 835
R 836
R 838
R 839
R 840
R 841
R 842
R 843
R 844
R 85]
100 ohm 15% .063W 0603
1k ohm 15% .063W 0603
150 ohm tS‘Vn 063W 0603
220 ohm 15% .063W 0603
220k ohm 15% .063W 0603
IM ohm SMD trimmer
10k ohm i5% 063W 0603
47 ohm 15% .063W 0603
100k ohm 15% .063W 0603
330k ohm 15% .063W 0603
560k ohm 15% .063W 0603
620 ohm 15% .063W 0603
620 ohm tS% .063W 0603
47k ohm 15% .063W 0603
10k ohm 15% .063W 0603
10k ohm 15% .063W 0603
10 ohm t5% .063W 0603
27k ohm 15% .063W 0603
12k ohm 15% .063W 0603
4.7k ohm t5% .063W 0603
18k ohm 15% .063W 0603
220k ohm SMD trimmer
27k ohm i5% .063W 0603
(435451 MHz)
18k ohm t5% .063W 0603
(450-466 MHz)
27k ohm t5% 063W 0603
(435-451 MHz)
10k ohm t5% .063W 0603
100k ohm t5% 063W 0603
10k ohm 15% .063W 0603
10k ohm 15% .063W 0603
1,5k ohm 25% 063W 0603
10k ohm 15% .063W 0603
100 ohm 15% .063W 0603
680 ohm i5% .063W 0603
22k ohm i5% .063W 0603
15k ohm 15% .063W 0603
470 ohm 15% .063W 0603
10 ohm t5% .063W 0603
680 ohm 15°/n 063W 0603
270 ohm t5% 063W 0603
(403-435 MHZ)
150 ohm 15% .063W 0603
(435-480 MHz)
270 ohm 15% .063W 0603
(480-5 | 2 MHz)
January I996
Part No. 001-3474-001
PART
HUMMER
569—0155-101
569—0155-102
569—0155-1 51
569—0155-221
569-0155-224
562-0130-105
569-01 55- 103
569-0155-470
569-0155-104
569-0155-334
569-0155-564
569-0155-621
569-0l 55-621
569-0155-473
569-01 55- 103
569-0155-103
569-0155-100
569-0155-273
569-0155-123
569-0155-472
569-0155-183
562-0130—224
569-0155-273
569-0155-183
569-0155-273
569-0155-103
569-0155-104
569-0155-103
569-0155-103
569-0155452
569-0155-103
569-0155-101
569-0155—681
569-0155—223
569-0155-153
569-0155-471
569-0155-100
569-0155-681
569-0155-271
569-0155-151
569-0155-271
SYMBOL
1mm Dsscmmou
R 852 18 ohm 15% .063W 0603
R 853
R 854
R 855
R 856
R 857
R 858
R 860
R 901
R 902
R 903
R 904
R 905
R 906
R 907
U 101
U 122
U221
U241
U261
U542
U801
Y801
Z201
Z20l
ZZOI
(403-435 MHz)
39 ohm i5% .063W 0603
(435-480 MHZ)
18 ohm 15% .063W 0603
(480-512 MHZ)
270 ohm 15% .063W 0603
(403-435 MHZ)
150 ohm 15% .063W 0603
(435-480 MHZ)
270 ohm 15% .063W 0603
(480-512 MHZ)
82 ohm 35°41 .063W 0603
100k ohm SMD trimmer
4,7k ohm 15% .063W 0603
4.7k ohm 15% .063W 0603
4.7k ohm :l:5% .063W 0603
100 ohm i5% .063W 0603
22k ohm i5% 1063W 0603
15k ohm 15% .063W 0603
100 ohm 15% .063W 0603
330 ohm 15% .063W 0603
220 ohm 15% .063W 0603
lo ohm t5% .063W 0603
2.2k ohm 1:5% .063W 0603
5.5V regulator 50-6
+5V regulator micropower SO
Double balanced mixer
PM [P MC3371D 50—16
Single op amp SOT-236
Single op amp SOT23-5
Fractional-N synthesizer
17.5 MHz TCXO i1.5 PPM
443 MHz helical filter SMD
(435-451 MHz)
459 MHZ helical filler SMD
(450-466 MHz)
472 MHz helical filter SMD
(464-480 MHZ)
PART
MEMBER
569-0155-180
569-0155-390
569-0155-180
569-0155-271
569-0155-151
569-0 l55-271
569-0155-820
562-0130-104
569-0155—472
569-0155-472
569-0155-472
569-0155-I01
569-0155-223
569-0155-153
569-0155-101
569-0155-331
569-0155-221
569-0155-I00
569-0155-222
544-2603-086
544-2003-067
544-0007-01 4
544-2002-03 1
544-20 1 6-00 1
544-2016-001
544-3954-027
518-7009-521
532-1005-042
532-1005-044
532-1005-045
PARTS LIST
SYMBOL
MEMBER mm
C 835 .Ol uF $1076 X7R 0603
C 836 .01 uF t]0% X7R 0603
C 837 .Ol uF 110% X7R 0603
C 838 68 pF t5% NPO 0603
C 839 .01 “F 110°/u X7R 0603
C 840 68 pF t5% NPO 0603
C 841 .01 (AF t10% X7R 0603
C 842 .01 uF 21:10% X7R 0603
C 844 l uF 16V SMD tantalum
C 845 .01 pl: 110% X7R 0603
C 846 68 pF i5% NPO 0603
C 847 .01 pF 110% X7R 0603
C 848 68 pF 15% NPO 0603
C 849 68 pF t5% NPO 0603
C 850 68 pF 15% NPO 0603
C 851 68 pF tS‘Va NPO 0603
C 852 68 pF i5% NPO 0603
C 853 1 (JP 16V SMD tantalum
C 855 68 pF i5% NPO 0603
C 901 .01 LLF 110% X7R 0603
C 902 27 pF iS‘Vo NPO 0603
C 903 .Ol uF 110% X7R 0603
C 904 220 pF t5% NPO 0805
C 905 270 pF 15% NPO 0805
C 906 .01 HF i10‘7/n X7R 0603
C 907 .01 uF i10% X7R 0603
C 908 01 uF 110% X7R 0603
C 909 1 (LP 16V SMD tantalum
C910 01 uFi10% X7R0603
C 911 68 pF 15% NPO 0603
CR201 Switching diode SOT-23
CR561 Pin switch diode SOT-23
CR562 Pin switch diode SOT—23
CR83I Dual switch diode SOT-23
CR901 Dual switch diode SOT-23
CR902 Dual switch diode 801123
EPZOO Mini cer crystal pin insulator
EPSOI Ferrite bead SMD
January 1996
Part No. 001-3474-001
PART
MEMBER
510-3675-103
510-3675-103
510-3675-103
510-3674-680
510-3675-103
5 l 0—3674»680
510—3675-103
Sl 0»3675-103
510-2625-109
510-3675-103
5103674-680
510—3675403
5103674680
510-3674-680
510v3674-680
510-3674-680
510-3674-680
510-2625-109
510‘3674-680
510—3675403
510—3674—270
510-3675-103
510-3601 -221
510-3601-271
510-3675-103
510-3675-103
510-3675-103
510-2625-109
510-3675-103
510-3674-680
523-1504-002
523-1504-001
523-1504-001
523-1504-023
523-1504-023
523-1504-023
010-0345-280
5172503-001
74
SYMBOL PART
NUMBER DESCRIEUQN NUMBER
EP541 Ferrite bead SMD 51725034001
J 201 l4-pin single row receptacle 515-71 10-214
J 501 Straight terminal PC bd mt 515-3013-030
L 201 Inductor LL2012 F15N 542-9003457
L 202 10 ml i10% SMD NHYOSOS 542-9003-107
L 222 1 pH i6%5mm variable 542-1012-015
L 201 15 nH 110% SMD 0805 542-9003-157
(403—466 MHz)
12 nH th‘Va SMD 0805 542-9003-127
(464.512 MHz)
L 202 12 nH i10% SMD 0805 542-9003-127
L 223 .82 1111 SMD inductor 542-9001-828
L 224 1 pH 16%5mm variable 542-1012-015
L 242 680 pH quad coil 542-5102-001
L 301 Inductor LL2012 FlZN 5423003427
(403435 MHz)
L 301 Inductor LL2012 F10N 542-90034107
(435-512 MHz)
L 302 Inductor LL2012 F15N 542-9003-157
L 401 82 nI-l 110% SMD 0805 542-9003-827
L 402 82 nH 11 0% SlVLD 0805 542-9003-827
L 404 1 pH SMD inductor 542-9001—109
L 501 18 nI-l inductor LL2012 FISN 542-9003-187
(435-451 MHz)
15 nH inductor LL2012 F15N 542-9003—157
(450-480 MHz)
L 502 1 pH SMD inductor 542-9001-109
L 503 15 mil inductor LL2012 F15N 542-9003-157
(403—496 MHz)
12 nH inductor LL2012 FI2N 542—9003-127
(496-512 MHz)
L 521 43 "H 10—tum SMD air core 542-0030-010
L 522 3,9 nH inductor LL2012 F3N9 542—9003-396
(403-419 MHz)
3.3 "11 inductor LL2012 F3N3 5429003336
(419-466 MHz)
27 "11 inductor LL2012 F2N7 542-9003-276
(464-496 MHz)
2.2 nI-l inductor LL2012 F2N2 542~9003~226
(496-512 MHz)
PARTS LIST
SYMBOL
NUMBER
C 302
C 302
C 303
C 304
C 305
C 306
C 309
C 401
C 402
C 403
C 404
C 405
C 406
C 407
C 408
C 410
C 501
C 502
C 503
C 504
C 505
C 506
C 507
C 508
C 509
C 510
C 511
DESCRLfllQN
6.8 pF i0.]% NPO 0603
(464-496 MHZ)
6.2 pF 31:0.1% NPO 0603
(496-512 MHz)
4.7 pF 10.1% NPO 0603
68 pF 15‘70 NPO 0603
4.7 pF i0,1% NPO 0603
(403-435 MHz)
3.3 pF i0.1% NPO 0603
(435—496 MHz)
3.3 pF $0.1% NPO 0603
(496-512 MHZ)
.01 111: ilO% X7R 0603
68 pF 25% NPO 0603
1 pf 16V SMD tantalum
101 pf i]0% X7R 0603
.01 MF 1:10% X7R 0603
.01 pLF 210% X7R 0603
101 p.F 11070 X7R 0603
100 pF 15% NPO 0603
6.8 pF 10.1% NPO 0603
100 pF tS‘Vn NPO 0603
.01 uF il0% X7R 0603
.1 pl: 15% X7R 1206
68 pF 5504 NFC 0603
7.5 pF i0.1% NPO 0603
(435-451 MHz)
6.8 pF 10.1% NPO 0603
(450—480 MHz)
68 [JP 15% NPO 0603
470 pF i5% NPO 0603
.01 uF 51004 X7R 0603
68 pF ¢5% NPO 0603
68 pF ¢5% NPO 0603
68 pF ¢5% NPO 0603
68 pF ¢5% NPO 0603
120 pF 15°47 NPO 0603
6.8 pF tO.1% NPO 0603
(403419 MHz)
5.6 pF ¢0_1% NPO 0603
(419-435 MHz)
5.1 pF 1010/6100 0603
(435-451 MHz)
3.9 pF $0.1‘Vo NPO 0603
(450-430 MHz)
January 1996
Pan No. 001-3474-001
PART
MEMBER
5 1 03673-6119
510—3673-689
510—3673—479
510-3674-680
510-3673-479
510-3673-339
510-3673-339
5 1 0-3675- 103
510-3674-680
510-2625—109
510-3675403
510-3675-103
510-3675-103
510-3675-103
510-3674-101
510-3673-689
510-3674—101
5 10-3675~ 103
510-3609-104
510-3674-680
510-3673-759
510-3673-689
510-3674‘680
510-3674-471
510-3675-103
510—3674-680
510-3674-680
510-3674-680
510-3674-680
510-3674-121
510-3673-689
510-3673-569
510-36737519
510-3673-399
7-2
SYMBOL
WEEK
C 520
C 521
C 522
C 523
C 524
C 525
C 526
C 527
C 541
C 542
C 543
C 544
C 545
C 546
C 547
C 548
C 549
C 550
C551
DESCRLEHDN
2.2 pF 10.1% NPO 0603
(480-496 MHz)
1 pF i0.l% NPO 0603
(496-512 MHz)
22 pF 15% NPO 0603
68 pF ¢5% NPO 0603
.01 pF $1076 X7R 0603
68 pF 15°45 NPO 0603
470 pF 25°43 NPO 0603
27 pF 15% NPO 0603
22 pF t5% NPO 0603
(403-419 MHz)
18 pF $011% NPO 0603
(419-435 MHz)
15 pF 15% NPO 0603
(435-512 MHz)
2.5-10 pF SMD ceramic
68 pF 3:5% N'PO 0603
.01 pF 1:10% X7R 0603
68 pF 1-5% NPO 0603
.01 pF 110% X7R 0603
68 pF 15% NPO 0603
68 pF t5% NPO 0603
68 pF 15% NPO 0603
1 0} 16V SMD tantalum
.01 thIO% X7R0603
36 pF 15'76 NPO 0805
(403-451 MHz)
30 pF 196 NPO 0805
(450—466 MHz)
27 pF ¢5% NPO 0805
(464-480 MHz)
20 pF 15% NPO 0805
(480-496 MHz)
18 pF 15°45 NPO 0805
(496-512 MHz)
33 pF 15% NPO 0805
(403-419 MHz)
27 pF t5% NPO 0805
(419-435 MHz)
24 pF i5% NPO 0805
(43 5-451 MHz)
18 pF 15% NPO 0805
(450-430 MHz)
16 pF 15% NPO 0805
(480—496 MHz)
15 pF tS‘Vo NPO 0805
(496-512 MHZ)
PART
NUMBER
510-3673-229
510-3673-100
510-3674-220
510-3674-680
510-3675-103
510-3674-680
510-3674-471
510-3674—270
510-3674-220
510-3673-180
510-3674-150
512-1602-002
510-3674—680
510-3675-103
5 10—3674»680
510-3675—103
51043674—680
510~3674~680
510-3674-680
510-2625-109
5 10-3675- 103
510-3601-360
510-3601-300
510-3601-270
510-3601-200
5104601480
5104601330
510—3601-270
5103601240
510-3601-180
510-3601-160
510-3601-150
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
R545/R54Z
IOGF
C232
ED)
ION
R807/9855
IOBA
‘ "‘.(——<38'=5/:9808
wows
Figure 6-3 ALIGNMENT POINTS DIAGRAM
January [996
Pan No. 001-3474-001 6—4
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
6.2.3 LOW POWER ALIGNMENT
1. Connect the test setup shown in Figure 6-1.
2. Load the synthesizer with the center channel
frequency.
3. Connect a voltmeter to the junction of R542/R543.
4. Adjust R542 clockwise for -l.5V DC (iOJV DC).
5. Tune C527 clockwise for maximum power.
6. Tune C553 clockwise for minimum power.
7. Adjust R542 for the required power level.
8. Tune C527 for power balance at frequencies which
are as close as possible to ii MHz from the center
of the channel frequency.
9. Re—adjust R542 for the power level required if
necessary.
10.Monitor the frequency with a frequency counter and
adjust TCXO (Y801) for the channel frequency
$100 Hz.
6.2.4 MODULATION FLATNESS ALIGNMENT
1. Inject a 220 Hz square-wave tone at approximately
0.35V P-P, biased at 2.5V DC on 1201, pin 6.
2. Tmsmit into the modulation analyzer and observe
modulation output on the oscilloscope. Set the
modulation analyzer high pass filtering off and no
less than 3 I5 kHz low pass filter,
3. Adjust R810 for a flat square-wave on the
oscilloscope.
4. Inject a 1 kHz sine-wave on JZOI, pin 6, biased at
2.5V DC, at the level below according to the
bandwidth:
0.200V RMS for 12.5 kHz BW (-X10 Radios)
0.330V RMS for 20.0 kHz BW (7X20 Radios)
0.400V RMS for 25.0 kHz BW (-X30 Radios)
5. Switch on TX Modulation. Set the modulation ana-
lyzer for 3 kHz low pass filtering.
January 1996
Part No. 001-3474-00]
I 6. The transmit deviation should measure between:
ill/$1.9 kHz for 12.5 kHz BW (-X10 Radios)
tl .9/:l:3.0 kHz for 20.0 kHz BW (-X20 Radios)
124/218 kHz for 25.0 kHz BW (-X30 Radios)
7. Set a 0 dB reference on the Audio Analyzer.
8. Input a 100 Hz sine-wave. The level should be
within 115 dB ofthe 1 kHz reference.
9. Remove transmit modulation and unkey the
transmitter.
10.Connect a DC voltmeter at the junction of R807/
R855.
Il.Adjust R855 to 2.10V DC (t0.05V DC).
couuumuvms
snvlct nontra-
unnuullun
nutm-
a.“ a:
vowzlu sumv
II
osv n:
Powm sumv
Q1,
Figure 6—2 RECEIVER TEST SETUP
6.2.5 RECEIVER ALIGNMENT
CAUTION
Do not key the transmitter with [he generalar con—
nected because severe generalor damage may result
I. Connect the test setup shown in Figure 6-2. Adjust
the power supply for +7.5V DC.
SERVICING
This page intentionally lefi blank.
January [996
Pm N0. 001-3474-00] 541
SERVICING
Camouflage
Check the DC voltage at C815 with a channel
near the center of the band. If the VCO is locked on
frequency, this should be a steady DC voltage near
3V. If it is not locked on frequency, it should be near
the lower or upper end of its range (CV or 5.5V).
QutpuLquueuqt
Check the VCO frequency at R85 1. If the VCO
is locked on frequency, it should be stable on the
transmit channel frequency. If the VCO is not locked
on frequency, the VCO control voltage is probably
near OV or 5.5Vi
5.2.4 SYNTHESlZER (11801)
Lock Detector
When the VCO is locked on frequency, the lock
detect output on 1201, pin 7 should be high.
5.3 RECEIVER SERVICING
To isolate a receiver problem to a specific sec-
tion, refer to the troubleshooting flowchart in Figure
5-1. Tests referenced in the flowchart are described in
the following information.
NOTE: Supply voltages are provided by the user,
5.311 SUPPLY VOLTAGES AND CURRENT
Measure the supply voltages on the following
pins at interface connector 1201:
Pin 4 — 5,0V DC Receive
Pin 5 » 5.0V DC
Place a DC ammeter in the supply line to the
transceiver and the following maximum currents
should be measured:
Pin4- lOmA
PinS-SOmA
January 1996
Part No, 001—3474-001
5.3.2 lVflXER/DETECTOR(U201)
MM
Using a .01 pF coupling capacitor, inject at
U241, pin 16, a 5295 MHz, 1 mV signal, modulated
with 1 kHz at t 3 kHz deviation. The audio output
level at U241, pin 9 should be approximately
400 mV RMS.
The data output on J201, pin 13 should be
600 mV to 1.2V P-P or 212 mV to 424 mV RMS with
the preceding injection signal.
RSSI Output
The RSSI output on 1201, pin 12 should be
greater than 100 mV at 12 dB SlNAD and less than
2,5V with 1 mV input. If either of the preceding mea-
surements is not correct, there may be a problem with
U2411
ensue: CVRRENV
AND vauncs
v “For In SEC'IION as
cuscx ruszs AND
WIRE maurss cwntcttens
cnsex urnsr/
nrvrcv ClRCUIt
firm to sscnou s 3.2
CNECK uzu
CNECK AUDIO
ctmm
trim? to srcrtou 55.3
W ,“° rzvucg omcnvz couponmr
cutcx surrms
$2ng snark mm: ME
1 eaten as my
AND rmsr mm“
l (SECTION 5.35)
Figure 51 RECEIVER SERVICING FLOW-
CHART
CIRCUIT DESCRIPTION
The low-pass filter consists of L561, C561, L562,
C562, L563, C563 and L564. The filter attenuates
spurious frequencies occurring above the transmit fre-
quency band. The transmit signal is then fed through
the antenna switch to antenna jack JSOl.
4.4.5 ANTENNA SWITCH (CR561, CR562)
The antenna switching circuit switches the
antenna to the receiver in the receive mode and the
transmitter in the transmit mode. In the transmit
mode, +7.5V is applied to L565 and current flows
through diode CR561, L566, diode CR562, and R562/
R563. When a diode is forward biased, it presents a
low impedance to the RF signal; conversely, when it is
reverse biased (or not conducting), it presents a high
impedance (small capacitance) Therefore, when
January 1996
Pan No. 001-3474-001
4-8
CR561 is forward biased, the transmit signal has a
low-impedance path to the antenna through coupling
capacitor C5684
C567, L566. and C570 form a discrete quarter—
wave line. When CR561 is forward biased, this quar-
ter—wave line is effectively AC grounded on one end
by C570, When a quaner-wave line is grounded on
one end, the other end presents a high impedance to
the quarter-wave frequency. This blocks the transmit
signal from the receiver. C569 matches the antenna to
50 ohms in transmit and receive.
ln the receive mode, no power is applied to L565,
so all the diodes are "017“. The receive signal then has
a high-impedance path into the transmitter and a low-
impedance path into the receiver because the quarter-
wave line is not grounded.
CIRCUIT DESCRIPTION
4.3.2 MIXER (U221), FIRST LO AMPLIFIER
(0301)
First mixer U221 mixes the receive frequency
with the first injection frequency to produce the 52.95
MHz filst IF. Since high-side injection is used, the
injection frequency is 52.95 MHz above the receive
frequency. The RF signal is coupled to the mixer
through C21 1.
The first injection frequency from the VCO is
coupled to the first local oscillator amplifier Q301
through C301. L301 and C302 match 0301 to the
VCO. Bias for 0301 is provided by 1601, R302 and
R303, and C303 decouples RF signals. Impedance
matching to the mixer is provided by L302, R304 and
C304.
4.3.3 AMPLIFIER (Q222), CRYSTAL FILTER
(Z221/Z222), IF AMP (0221)
The output of U221 is coupled to buffer 0222.
C222, R229 and Q222 match the 50 ohm output of
U221. Bias for Q222 is provided by R228 and R229.
The output onZZZ is matched to crystal filter Z221
via L222, C223 and R230. This filter presents a low
impedance to 52.95 MHZ and attenuates the receive,
injection, and other frequencies outside the 52.95
MHz passband.
2221 and 2222 form a Z-section, 4-pole crystal
filter with a center frequency cf52.95 MHz and a -3
dB passband of8 kHz (12.5 kHz BW) or 15 kHz (20/
25 kHz BW). This filter establishes the receiver selec-
tivity by attenuating the adjacent channel and other
signals close to the receive frequency. C232, C224,
and L223 adjust the coupling ofthe filter. L224, C225
and C227 provide impedance matching between the
filter and Q221.
lF amplifier 0221 amplifies the 52.95 MHz IF
signal to recover filter losses and improves receiver
sensitivity. Biasing for Q221 is provided by R222.
R223, R225 and R226 and C228, C229 decouple RF
signals. The output of 0221 Is coupled to the detector
by 12230.
January 1996
Part No, 001-3474-001
4.3.4 SECOND LO AMP/TRIPLER (0401), SEC-
OND IF FILTER (Q901)
The input frequency to 0401 is 17.5 MHz from
TCXO Y801 coupled through C402. Bias for Q401 is
provided by R401. R402, R403 and R404, C403,
C404 decouple RF from the amplifier. L401, L402,
C405, C406 and C407 pass the third harmonic of the
input (52.5 MHz) to U241, pin 1. The output of the
amplifier is coupled to U241, pin 1 by C241, and
C410 and L404 provided low frequency decoupling.
4.3.5 SECOND MIXER/DETECTOR (U241)
Oscillator and Mixer
As shown in Figure 4-3, U241 contains the sec-
ond oscillator, second mixer, limiter, detector, and
squelch circuitry. The 52.95 MHz IF signal is mixed
with a 52.5 lVfl-lz signal produced by second LO
amplifier (3401 from TCXO Y801.
czu
”mat—37:1 ‘
c" osmium: b mm 4 ‘ullElu
no- 15
MM . W
+— 3 _ u.
m u N.
m E u
17 m
1_’ J—J—fl
. . _ “mm. L ”mm
Figure 4-3 U241 BLOCK DIAGRAM
Second IF Filter
The output of the internal double-balanced mixer
is the difference between 52.95 MHz and 52.5 MHz
which is 450 kHz, This 450 kHz signal is fed out on
pin 3 and applied to second IF filters D41 and 2242.
These filters have passbands of 9 kHz (12.5 kHz BW),
15 kHz (20 kHz BW) or 20 kHz (25 kHz BW) at the
-6 dB points and are used to attenuate wideband noise.
CIRCUIT DESCRIPTION
The -2V applied to the VCO is derived from the
TCXO frequency that is amplified by Q833, rectified
by CRSBl and filtered by C844, C845, C846 and
C847 on the RF board.
The VCO frequency is modulated using a similar
method. The transmit audio/data signal is applied
across varactor diode CRSSZ which varies the VCO
fi'equency at an audio rate. Series capacitors C856/
C870 set the amount of deviation produced along with
CR853 and C858. R854 provides a DC ground on the
anodes of CRSSZ/CR853, and isolation is provided by
R852 and C855.
The DC voltage across CR853 provides compen-
sation to keep modulation relatively flat over the
entire bandwidth of the VCO. This compensation is
required because modulation tends to increase as the
VCO frequency gets higher (capacitance of CR854/
CRSSS/CRSSG/CRSSI gets lower). CR853 also bal-
ances the modulation signals applied to the VCO and
TCXO. An external voltage from 1201, pin 14 can
also adjust the modulation
The DC voltage applied across CR853 comes
Ii'om the modulation adjust control R810. R811
applies a DC biasing voltage to CR852; C814 pro
vides DC blocking; and C818 attenuates AC signals
applied through R81 l. RF isolation is provided by
C858, R853, C817 and R812.
4.2.3 VCO AND REFERENCE OSCILLATOR
MODULATION
Both the VCO and reference oscillator (TCXO)
are modulated in order to achieve the required fre-
quency response. If only the VCO was modulated, the
phase detector in U801 would sense the frequency
change and increase or decrease the VCO control volt»
age to counteract the change (especially at the lower
audio frequencies), If only the reference oscillator
frequency is modulated. the VCO frequency would
not change fast enough (especially at the higher audio
frequencies). Modulating both VCO and reference
oscillators produces a flat audio response. Potentiom-
eter R810 sets the VCO modulation sensitivity so that
it is equal to the reference oscillator modulation
sensitivity
January 1996
Part No. 001-3474-00I
4.2.4 CASCODE AMPLIFIERS (Q85I/0852)
The output signal on the collector of Q850 is cou-
pled by L861/C864 to buffer amplifier QSS 1/0852.
This is a shared-bias amplifier which provides ampli-
fication and also isolation between the VCO and the
stages which follow. The signal is direct coupled
from the collector of QSSZ to the emitter of QBSI.
The resistors in this circuit provide biasing and stabili—
zation, and C865 and C866 are bypass capacitors,
4.2.5 AMPLIFIER (0853)
Amplifier Q853 provides amplification and isola-
tion between the VCO and receiver and transmitter.
C868 provides matching between the amplifiers.
Bias for 0853 is provided by R87] , R872 and R874.
Inductor L856 and capacitor C873 provide impedance
matching on the output.
4.2.6 VOLTAGE FILTER (Q832)
Q832 is a capacitance multiplier to provide filter-
ing of the 4.6V supply to the VCO. R836 provides
transistor bias and C834 provides the capacitance that
is multiplied. If a noise pulse or other voltage change
appears on the collector. the base voltage does not
change significantly because of C834. Therefore,
base current does not change and transistor current
remains constant. CR832 decreases the charge time of
C834 when power is turned on. This shortens the
startup time ofthe VCO. C841, C840 and C855 are
RF decoupling capacitors.
4.2.7 VCO FREQUENCY SHIFT (0831)
The VCO must be capable of producing frequen-
cies from approximately 403-56495 MHz to produce
the required receive injection and transmit frequen»
cies. Iftl‘us large ofa shift was achieved by varying
the VCO control voltage, the VCO gain would be
undesirably high. Therefore, capacitance is switched
in and out of the tank circuit to provide a coarse shift
in frequency.
This switching is controlled by the T/R pin shift
on1201, pin 4, Q8] l/Q834 and pin diode CR850.
When a pin diode is forward biased, it presents a vary
558523 T
CIRCUIT DESCRIPTION
m was:
525: U
s a
E55: M
. OAI||41
55.05 ,
as m
fl jun 25: D
s; 55 K
m C
as m 50 a \ m
5.53
55 O o > , TA B
Y . . , an) I E v:
. 5g
< . , 9a E
a, w
E 7..
1 w 5 x. K 4
H N\‘ 1.1‘t A
u . T
A, A
M §>§T “mafia zs i 53 I1 D
m is 3: is 5255 1
5? L
, vs muktzmz/xmh n
E; ., . . . v u
< < .w._
“ F
7 P m
z; a; o.
‘ 32 a, Y." a}; 3 _: m
93. a M
6 .
A is ESSA; RS 9 10.
an m o
2 I, 55: 350 5:5 .
I g; u
xx 32 55; m. N
PROGRAMMING
3.3 RECEIVE T0 TRANSMIT SEQUENCE
Refer to Figure 3-5.
1. Synthesizer is loaded (B and A 24-Bit words or one
long 32-bit A-Word).
2. The state ofthe SRCL line does not have to be
changed until the last bit is sent, However, RX will
cease as soon as it is changed.
3 The SYNTH ENABLE line should be held HIGH
for 2 to 3 milliseconds afier the last word is sent.
This puts the frequency synthesizer in a SPEEDUP
MODE and slightly improves lock times.
4, Afier the last word is strobed in, 7 milliseconds
(worst case) should elapse before 75 TX is turned
ON. This allows the synthesizer to come within 1
kHz of the desired frequency.
sruw n.-
ma
Figure 3-5 RX T0 TX TIMING DIAGRAM
Dekey is a length of time to allow the TX to
power down while the synfltesizer is still in look. This
is needed to meet ETS] (European Telecommunica—
tions Standards Institute) adjacent power specifica-
tions Dekey is approximately 3 ms in length. The
75 TX should be ramped or optimally filtered in such
a way as to reduce the Sinx/x power spreading.
Speedup will slightly improve lock times and is l to
2 ms,
3.4 TRANSMIT TO RECEIVE SEQUENCE
Refer to Figure 3-6.
L 7.5 TX is turned OFF For best TX adjacent chan-
nel power performance this could be shaped.
2. The synthesizer load process could begin slightly
before, but when the last bit is strobed in the synthe-
sizer it will become unlocked. For ETSI specs, the
TX should be turned OFF "on-Ii'equency".
3. The SRCL line should switch from low to high
AFTER the 75 TX is switched. The SRCL not only
turns the RX circuits on but also Pin Shifis the
VCO,
4. For quickest lock times the SYNTH ENABLE line
on the last load word should be held high for 2 to 3
milliseconds It MUST NOT be lefi high as the syn-
thesizer in the SPEEDUP mode has poor noise per-
formance and would degrade the RX performance.
mt
am in lap 0- PL m P
van W flan ' . can: _
clam . J?
sue-t :
9mm Gy’éh— : .
m ,. - i ,
mum mm»
Figure 3—6 TX T0 RX TIMJNG DIAGRAM
Speedup is 2 to 3 ms
Lock is approximately 7 ms
Ramp is approximately 3 ms
IlVIPORTAN T
If the receiver is to be operated at 510-512 MHz (-810), a spurious condition may occur to degrade the
receiver sensitivity 2 to 3 dB. Iflhis degradation IS unacceptable, the synthesizer can be reprogrammed to a com-
parison frequency (FCM) of31l25 kHz (so that a multiple of this would not be 52.95 MHz) and a modulus
(FMOD/ of 5 with a reference divide (NR) of 5 60 These parameters place the spurious at harmonics 0/3125 kHz
(instead of 50 kHz) outside the passband nflhe IF fillers where the sensitivity is not degraded
January 1996
Part No 00l-3474v00l
3-4
$4;
PROGRAMMING
The Fractional-N increment (NF) is a 3-bit word
that is channel dependent. NF is used to program the
sub-channels below the 50 kHz Loop Reference fre-
quency. FCM = 50 kHz and if FMOD = 8, then the
Fractional-N increment is: 50 kHz + 8 = 6.25 kHz
To program an 1875 kHz channel:
NF = l8.75 kHz+ 6.25 kHz
NF=3
NMI and NM2 are calculated as follows:
N=(NMl +2)x64+NM2x65
Where:
N = total division ratio
NM] = Number of main divider cycles when
prescaler modulus equals 64
NM2 = Number of main divider cycles when
prescaler modulus equals 65
Al\5
Example:
Calculate NMl and NM2 to Receive 454.500 MHz
L0 = 454.5 + 52.95 = 507.45 MHz
(52.95 MHz IF with High Side lnjection)
N = RX LO + FCM = 507.45 + 005 =10l49
(FMC = Loop Reference Frequency)
NM2 =64xFRAC[N+64]
= 64 xFRAC [10149+64]
=64 x0.57813
=37
NMl =1'NTEGER[N+64]-2-NM2
=158-2-37
=ll9
‘c; 2‘1
BW§1 2 3 4) 5 a 7 B 9 w H i: ts M is is 17 us 19 20 2\ 22 23 24'
l‘lOlGOO ‘010L11i00010000/ii
.\ i
Y J DIE LTJ LXJ
ADDRESS NR (REFERENCE Dlvl )
- 350 FOR so kHz REFERENCE
SM (ALWAYS 00)
EM (ALWAYS |)
5A(NDT USED)
EAiALWAVS D)
moo (l=MODUL\JS e. D = MODULUS 5)
LONG 0:32 an wow 0:24 an WORD)
FigureS—l D-WORD
ElTS'2345B7‘S9(O‘112l3l4\516l7\5l9202|222324
l 0 ® 0 0 0 o o Cv/lO/le'lO/lO/lD/iO/lO/‘ o o 0 0 o D o 1
v k / i
v v - V LY"
ADDRESS Nor user cm CK (1L
(ALWAV'E 0000:
{CHARGE PUMP CURRENT SETTvNc-l
{CWANNEL DEPENDENT)
BINARY ACCELERATION
FACTOR (ALWAYS 000000)
PR (PRESCALEP TVDE7 40\:DUAL MDDULUS/
Figure 3—2 B-WORD
January I996
Part No. 00l-3474>001
INSTALLATION
CARRIER DETECT
as: our
RX DATA om
Figure 2-1 DM3474 INTERFACE CABLE
TX
CM 7 F133 - [Que Q’s? + 36
u» x “mm
MIL t ooofilolofmo
o A E
January l996
Fan No. 001-3474-001 2-2
EX
or fife,
GENERAL XNFORMATION
This page intentionally lcfi blank.
January l996
Parl No. 001-3474-001 1-6
GENERAL INFORMATION
This page intentionally left blank,
January 1996
Pan No. 00l-3474700I 1—4
GENERAL lN FORMATION
7:30 am. - 4:30 pm. Central Time, Monday - Fri—
day. There is also a 24-hour emergency technical sup—
port telephone number. From within the continental
United States, the Customer Service Department can
be reached at this toll-free number
1-800-328-3911
When your call is answered at the E.F. Johnson
Company, you will hear a brief message informing
you of numbers that can be entered to reach various
departments, This number may be entered during or
afier the message using a tone‘type telephone. If you
have a pulse—type telephone, wait until the message is
finished and an operator will come on the line to assist
you. When you enter a first number of "1 " or "2",
another number is requested to further categorize the
type of information you need. You may also enter the
4-digit extension number of the person that you want
to reach if you know what it is.
FAX Machine - Sales
FAX Machine - Cust Serv
(507) 835-6485
(507) 835-6969
If you are calling from outside the continental
United States, the Customer Service telephone num-
bers are as follows:
Customer Service Department » (507) 835-6911
Customer Service FAX Machine - (507) 8356969
You may also Contact the Customer Service
Department by mail. Please include all information
that may be helpful in solving your problem. The
mailing address is as follows:
E.F. Johnson Company
Customer Service Department
299 Johnson Avenue
PO. Box 1249
Waseca, MN 560930514
L7 PRODUCT WARRANTY
The warranty statement for this transceiver is
available from your product supplier or from the War-
ranty Department, BF. Johnson Company. 299
Johnson Avenue. Box 1249. Waseca. MN 56093-
0514. This information may also be requested by
January 1996
Part No. 001-3474-001
12
phone from the Warranty Department. The Warranty
Department may also be contacted for Warranty Ser-
vice Reports, claim forms, or any questions concom-
ing warranties or warranty service by dialing (507)
835-6970.
1.8 REPLACEMENT PARTS
E.F. Johnson replacement pans can be ordered
directly from the Service Parts Department. To order
parts by phone, dial the toll»free number and then
enter "7" as described in Section 1.6. When ordering,
please supply the part number and quantity of each
part ordered. E.F. Johnson dealers also need to give
their account number.
If there is uncertainty about the part number,
include the designator (C1 12, for example) and the
model number of the equipment the part is from (refer
to Section 1.3).
You may also send your order by mail or FAX.
The mailing address is as follows and the FAX num-
ber is shown in Section 1.6.
E.F. Johnson Company
Service Parts Department
299 Johnson Avenue
Box 1249
Waseca, MN 56093-0514
1.9 FACTORY RETURNS
Repair service is normally available through local
authorized EF. Johnson Land Mobile Radio Service
Centers. lflocal service is not available, the equip-
ment can be returned to the factory for repair. How-
ever, it is recommended that you contact the Field Ser-
vice Department before retuming equipment. A
service representative may be able to suggest a solu-
tion to the problem so that retum of the equipment
would not be necessary. If using the toll-free number
in the preceding section, enter ”8
Be sure to fill out a Factory Repair Request Form
“271 for each unit to be repaired, whether it is in or
out of warranty, These forms are available free of
charge by calling the repair lab (see Section 1.6) or by
4A
5.1
5.2
5.3
5.4
6,1
6.2
TABLE OF CONTENTS
SECOND MIXER/DETECTOR (U241) .....
TRANSMITTER CIRCUIT DESCRIPTION
BUFFER (QBSI) ......................
PRE-DRIV'ER (QSOI). DRIVER (Q521).
-5V POWER CONTROL SUPPLY .......
FINAL (Q541), POWER CONTROL (U542) ,
ANTENNA SWITCH (CR561. CR562) ................
SERVICING
GENERAL .............
PERIODIC CHECKS .....
SURFACE-MOUNTED COMPONENTS ............
SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS ,
REPLACEMENT PARTS LIST .................... 7
TCXO MODULE NOT SERVICEABLE . 5-I
SYNTHESIZER SERVICING ..... . 5-I
INTRODUCTION ......... . 5-1
REFERENCE OSCILLATOR . S—I
VCO ................ . 5-I
SYNTHESIZER (USOI). . 5-2
RECEIVER SERVICIN 5-2
SUPPLY VOLTAGES AND CURRENT A 5-2
MIXER/DETECTOR (UZOI) .................. 5-2
RF AMPLIFIER (QZOI) AND FIRST MIXER (Q221). . 5-3
RF AND IF AMPLIFIERS, FIRST MDGR ......
TRANSMITTER SERVICING .........
SUPPLY VOLTAGES AND CURRENT ........
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
GENERAL ...................................................
D134“ TRANSCEIVER ONLY .............
FREQUENCY AND CONTROL LINE VOLTAGE CHECK
2W TRANSMITTER POWER ALIGNMENT. . . . ,
LOW POWER ALIGNMENT .............
MODULATION FLATN'ESS ALIGNMENT A
RECEIVER ALIGNMENT ...........
IF AND AUDIO ADJUSTMENTS .........
PARTS LIST
SCHEMATICS AND COMPONENT LAYOUTS
VCO COMPONENT LAYOUT ............
TRANSCEIVER COMPONENT LAYOUTS .
TRANSCEIVER SCHEMATIC ............
Source Exif Data: 
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 2001:05:05 01:40:51
Producer                        : Acrobat Distiller 4.0 for Windows
Modify Date                     : 2001:05:05 01:40:53-04:00
Page Count                      : 44
EXIF Metadata provided by EXIF.tools
FCC ID Filing: LXQA190-001G1

Navigation menu