Patriot RITRON SST-442 Operating and maintenance manual

TYPE OF EXHIBIT: INSTRUCTION MANUALS
FCC PART: 2.1033 (c)(3)
MANUFACTURER: RITRON, INC.
505 West Carmel Drive
Carmel, IN 46032
MODEL:SST-442
TYPE OF UNIT: UHF-FM Handheld Transceiver
FCC ID: AIERIT13-442
DATE:May 11, 2001
Included in this exhibit is a draft of the Maintenance and Operating Manual for RITRON Model Patriot
SST-442UHF-FM Handheld Transceiver.
Specifically, this manual includes a technical description of the SST-442sufficient to establish compliance
with the technical standards of the applicable rule part(s).
This includes, but is not limited to, the following items required under FCC Part 2.1033 (c):
(2) FCC Identifier.
(3) A copy of the installation and operating instructions.
(4) Type of emission.
(5) Frequency range.
(6) Range of operating power, and means to provide variation in operating power.
(7) Maximum power rating.
(8) DC voltage chart.
(9) Tune-up procedure.
(10) A description of all frequency determining and stabilization circuits. A description of the circuits
used to suppress spurious radiation, limiting modulation, and limiting power.
(12) Drawing with labels for controls and complete circuit diagrams.
Signed: Michael A. Pickard - Project Engineer

TWO-WAY RADIO BY RITRON
RITRON MODEL SST-442
UHF FMBAND PROGRAMMABLE HANDHELD RADIO
MAINTENANCE / REPAIR / OPERATING MANUAL
FOR USE BY AUTHORIZED SERVICE/MAINTENANCE PERSONNEL ONLY
SST-442-MRMREVA
COPYRIGHT2001 RITRON, INC. •ALL RIGHTS RESERVED
RITRON, JOBCOM, and QUIET CALL, ARE REGISTERED TRADEMARKS OF RITRON, INC.

TABLE OF CONTENTS SST-442
TOPIC PAGE
IMPORTANT MAINTENANCE/REPAIR INFORMATION..1
SPECIFICATIONS
GENERAL......................................................................... 2
CONTROLS ...................................................................... 2
TRANSMITTER................................................................. 2
RECEIVER........................................................................ 3
BATTERY ......................................................................... 3
INTRODUCTION
GENERAL......................................................................... 4
Model Identification ..................................................... 4
FCC REGULATIONS
Licensing..................................................................... 4
Safety Standards......................................................... 4
BATTERY CARE
CHARGING....................................................................... 5
PRECAUTIONS ................................................................ 5
BATTERY REPLACEMENT.............................................. 5
Fig. 1 Battery Replacement......................................... 5
BATTERY MAINTENANCE............................................... 6
BATTERY CONDITIONING .............................................. 6
OPERATION
DESCRIPTION OF CONTROLS AND CONNECTORS..... 7
Fig. 2 Controls and Accessory Connectors.................. 7
RADIO OPERATION
On-Off/Volume ............................................................ 8
Receive....................................................................... 8
Selective Signaling Squelch ........................................ 8
Monitor........................................................................ 8
Battery Saver .............................................................. 8
Transmit...................................................................... 8
Channel Selection ....................................................... 8
WHAT THE RADIO TONES MEAN
Power On/Self Check “OK........................................... 9
Error Tones ................................................................. 9
Channel Select............................................................ 9
Tone Squelch.............................................................. 9
Recharge Battery Alert ................................................ 9
OPTIONAL RADIO TONES
Receiver Squelch Tone ............................................... 9
Busy Channel Inhibit ................................................... 9
Transmitter Time Out .................................................. 9
BELT CLIP INSTALLATION.............................................. 9
TROUBLESHOOTING
General ..................................................................... 10
Battery ...................................................................... 10
Error Tones ............................................................... 10
Tone Coded Squelch................................................. 10
PROGRAMMING THERADIO
PTT (PUSH-TO-TALK) PROGRAMMING
Fig. 3 Placing the Radio in Program / Readout Mode 11
Reading Out a Radio Channel’s Content................... 11
PTT Programming the Radio..................................... 12
Return To Normal Operation ..................................... 12
PTT Programming Mistakes...................................... 12
Table 1 – PTT Programming Frequency Table.......... 13
Table 2 – Quiet Call Codes and Frequencies ............ 13
COMPUTER SOFTWARE COPYRIGHTS ...................... 13
PC COMPUTER PROGRAMMING ................................. 13
Programmable Features............................................ 14
Description of Features ............................................. 15
TOPIC PAGE
THEORYOFOPERATION
INTRODUCTION .............................................................16
POWER SUPPLY AND VOLTAGE DISTRIBUTION........ 16
Power Strobe............................................................. 16
Low Battery Voltage Detection...................................16
REFERENCE OSCILLATOR ........................................... 16
SYNTHESIZER ..............................................................16
Pin Numbers.............................................................. 16
Prescaler Divider / Synthesizer Controller..................16
VCO / Buffer Amplifiers .............................................17
Oscillator Modulation .................................................17
DIGITAL POTENTIOMETERS......................................... 17
RECEIVER ......................................................................17
RF Amplifier...............................................................17
1st Mixer....................................................................18
FM Receiver Subsystem............................................ 18
Voice / Tone Conditioning in Receiver Mode .............18
Voice Band ................................................................18
Sub-Audible............................................................... 18
Audio Amplifier ..........................................................18
ANTENNA SWITCHING / LOW-PASS FILTER............... 19
TRANSMITTER ............................................................... 19
Keying .......................................................................19
+VTX Supply..............................................................19
Power Amplifier .........................................................19
Voice/Tone Conditioning in Transmit Mode ...............19
Voice Band ................................................................19
Sub-Audible............................................................... 19
MICROCONTROLLER ....................................................20
ALIGNMENTPROCEDURE
RECOMMENDED TEST EQUIPMENT............................21
RADIO PREPARATION...................................................21
REFERENCE FREQUENCY ...........................................21
MODULATION BALANCE ...............................................22
TRANSMITTER TONE DEVIATION ................................22
TRANSMITTER VOICE DEVIATION............................... 22
RECEIVER SENSITIVITY AND SQUELCH.....................22
RECEIVER NOISE SQUELCH ........................................23
SYNTHESIZER ...............................................................23
VOLTAGE CHART
Measurement Conditions................................................. 24
SST-442 Voltages ........................................................... 24
PARTS LIST
SCHEMATIC REFERENCE PARTS LIST .......................27
CASE ASSEMBLY PARTS LIST .....................................33
SCHEMATIC AND PART PLACEMENT DRAWINGS
TOP SIDE PART PLACEMENT.......................................35
BOTTOM SIDE PART PLACEMENT...............................36
SCHEMATIC – UHF RF ..................................................37
SCHEMATIC – Signal Processing ................................... 38

IMPORTANT REPAIR / MAINTENANCE INFORMATION SST-442
1
Surface Mount Repair
RITRON surface mount products require special
equipment and servicing techniques. Improper
servicing techniques can cause permanent damage
to the printed circuit boards and/or components,
which is not covered by RITRON’s warranty. If you
are not completely familiar with surface mounted
component repair techniques, RITRON recommends
that you defer maintenance to qualified service
personnel.
Precautions for Handling CMOSDevices
This radio contains complementary metal-oxide
semiconductor (CMOS) devices, which require
special handling techniques. CMOS circuits are
susceptible to damage by electrostatic or high voltage
charges. Damage can be latent, with no failure
appearing until weeks or months later. For this
reason, take special precautions any time you
disassemble the radio. Follow the precautions below,
which are even more critical in low humidity
environments.
1) Storage/transport - CMOS devices that will be
stored or transported must be placed in
conductive material so that all exposed leads are
shorted together. CMOS devices must not be
inserted into conventional plastic “snow” or
plastic trays of the type that are used for other
semiconductors.
2) Grounding - All CMOS devices must be placed
on a grounded bench surface. The technician
that will work on the radio/CMOS circuit must be
grounded before handling the radio. Normally,
the technician wears a conductive wrist strap in
series with a 100K Ohm resistor to ground.
3) Clothing - Do not wear nylon clothing while
handling CMOS circuits.
4) Power off - Remove power before connecting,
removing or soldering a PC board that contains
CMOS devices.
5) Power/voltage transients - Do not insert or
remove CMOS devices with power applied.
Check all power supplies to be used for testing
CMOS devices, making sure that no voltage
transients are present.
6) Soldering - Use a grounded soldering iron for
soldering CMOS circuitry.
7) Lead-straightening tools - When straightening
CMOS leads, provide ground straps for the tool
used.
PC Board Removal - Special Tool
RITRON recommends using a knurled nut tool to
remove the slotted knurled nuts that secure the
charge and audio jacks on top of the radio. You will
need two sizes of this tool, one for each jack size.
Mouser Corporation is one source, stock number
382-0004 (2.5mm jack) and 382-0006 (3.5mm jack).
You can reach Mouser sales and distribution center
at 1-800-346-6873.
Properly Attach the Synthesizer Shield
The synthesizer shield should not be removed, unless
a component must be replaced. This shield is
soldered to the main PC board.
Re-assembly - Speaker Magnet, BatteryVoltage
on Connector Pin
The speaker magnet will pick up clipped leads and
other small metal objects from your bench top. Even
tiny objects on the diaphragm will cause the speaker
to buzz. Make sure the speaker is free of foreign
objects before reassembling the radio.
Radio Transmitter Power Measurements
The SST-442 was designed to produce 2 Watts of
Transmitter power at nominal battery voltage (+7.2
VDC), throughout the radio’s operating frequency
range. Measurements are made with the RITRON
SST-SRVBD RF service module connected to the
radio antenna terminal. The transmitter was
designed with close tolerances to prevent RF power
output from exceeding specifications and reducing
battery life.
PCB and Firmware Revisions
Changes in circuit design, component values, and
radio firmware are made occasionally to enhance the
performance of the SST-442. In general, the manual
will be periodically updated for component value
changes without a change in the manual revision
level. Always refer to the Schematic Reference Parts
List for the most recent component values. Changes
in circuit design that require printed circuit board
revision, or changes in firmware that significantly alter
the operating characteristics of the radio, will be
covered in a revised manual.
This manual is updated for the following revisions:
SST-442-MRM Rev A
PCB Revision 1750270A
Firmware Revision v06

SPECIFICATIONS SST-442
2
GENERAL
FCC ID: AIERIT13-442
FCC Rule Parts: 22, 74, 90, 95
Frequency Range: 450 to 470 MHz
Max. Freq. Separation: 10 MHz
RF Channels: Up to 10 Channels,
Independent TX/RX
frequencies.
Synthesizer Step Size: 12.5 KHz
Frequency Stability: +/-2.5 PPM (-30 to +60 C)
TX/RX
Tone/Code Signaling: CTCSS (Quiet Call)
Digital Coded Squelch
(Digital Quiet Call)
Dimensions: 4.75”H x 2.2”W x 1.43”D
Weight: 11.5 oz. with battery pack
Enclosure Material: Lexan Polycarbonate
Environmental: Splash resistant and
shock and vibration per
RITRON Drop Test (6 ft.
drop onto concrete on all
six sides)
Antenna Fitting: 1/4" - 32 x 1/4" threaded
External RF Test Jack: Antenna connector with
RITRON SST-SRVBD test
device
Earphone Jack: 3.5 mm, disconnects the
internal speaker for
external earphone,
speaker / microphone, or
headset. Also provides
cable connection for PC
programming.
Microphone/PTT/ 2.5 mm, for external
Chg Jack: speaker/microphone,
headset or RITRON model
BC-A wall charger.
CONTROLS
Push Button Controls: On/Volume Up, Volume
Down/Off, PTT, Channel
Speaker Beep Indicators:
On/Volume Up: Radio beeps channel
number when turned on,
followed by increasing
audio to adjust volume.
Volume Down/Off: Decreasing audio to adjust
volume, with two tones
when turned off.
Both Volume Buttons: Alternates between Tone
Squelch (single beep) and
Carrier Squelch (two
beeps). If both buttons
are held down until the
radio beeps repeatedly,
squelch will be disabled.
PTT: Programmable for a single
“transmit beep”.
Channel: Number of beeps indicates
channel.
TRANSMITTER
RF Power Output: 2 Watts @ +7.2 VDC
Wide Mode Narrow Mode
Emission Designator: 16K0F3E 11K0F3E
Deviation: +/- 5.00 KHz +/- 2.50 KHz
FM Hum and Noise: -43 dB -37 dB
Audio Distortion:<3%
Spurious & Harmonics: -50 dBc
Audio Response: Meets FCC and EIA
requirements
Time-out Timer: 60 seconds,
programmable

SPECIFICATIONS SST-442
3
RECEIVER
Wide band Narrow band
Models Models
Modulation Acceptance: +/- 7.0 KHz +/- 3.75 KHz
Sensitivity: 0.25 µV 0.25 µV
(12 dB SINAD)
Adjacent Channel (EIA): -60 dB -50 dB
Spurious Rejection: -60 dB -60 dB
Image Rejection (EIA): -70 dB -70 dB
Intermodulation (EIA): -56 dB -57 dB
Noise Squelch Programmable per
Sensitivity: channel, factory set for 12
dB SINAD
Frequency Response: 300 - 3000 Hz, de-
emphasized
Audio Output 1 Watt into 8 Ω, with less
than 5 % THD @ the
earphone jack
Receiving System: Dual conversion
superheterodyne
I.F. System: 1st - 43.65 MHz,
2nd - 450 KHz
L.O. Injection: Low side
QC/DQC Decode Time: per EIA Standards
BATTERY
Battery Pack: +7.2 VDC, 800 mAH
rechargeable NiCd battery
pack standard
+7.2 VDC, 1500 mAH
rechargeable MiMH
battery pack optional
Battery Drain:
Standby: 52 mA
Sleep: 12 mA
Avg. Standby
with Power Saver: 24 mA
Receive: 125 mA
Transmit: 850 mA @ 2 Watts
Battery Life @ 90/5/5 Duty Cycle with
Standard battery pack (800 mAH):
12.7 Hrs, Battery Saver On
8.4 Hrs, Battery Saver Off
Battery Life @ 90/5/5 Duty Cycle with
High capacity battery pack (1500 mAH):
23.7 Hrs, Battery Saver On
15.7 Hrs, Battery Saver Off

INTRODUCTION SST-442
4
GENERAL
RITRON's SST-442 handheld is a small,
programmable two-way radio, designed to operate in
the 450-470 MHz professional FM communications
band. This handheld features push-button operating
controls, with the Push-To-Talk and Channel buttons
on one side of the radio. The On / Volume Up and
Volume Down / Off, volume and monitor controls are
on top.
Each radio can be “dealer” programmed to contain a
unique set of operating frequencies and options.
Selective signaling options include Quiet Call
(CTCSS) and Digital Quiet Call (DCS). Transmitter
power, operating bandwidth and battery saver are
among the options programmable on a per channel
basis.
Model Identification
The SST-442 model, serial number and FCC
Identification are displayed on a label located on the
back of the radio beneath the belt clip.
FCC REGULATIONS
Licensing
The FCC requires the radio owner to obtain a station
license for his radios before using them to transmit,
but does not require an operating license or permit.
The station licensee is responsible for ensuring that
transmitter power; frequency and deviation are within
the limits specified by the station license. The station
licensee is also responsible for proper operation and
maintenance of the radio equipment. This includes
checking the transmitter frequency and deviation
periodically, using appropriate methods.
Safety Standards
In 1991 the Institute of Electrical and Electronics
Engineers (IEEE), and in 1992 the American National
Standards Institute (ANSI) updated the 1982 ANSI
standard for safety levels with respect to human
exposure to RF energy. Over 120 scientists,
engineers, and physicians from universities,
government health agencies, and industry, after
reviewing the available body of research, developed
this updated Standard. In March 1993 the Federal
Communications Commission (FCC) proposed the
adoption of this updated Standard.
The SST-442 handheld radio is designed to comply
with this Standard. To limit your exposure to levels
at, or below, the levels in the Standard, please
observe the following:
•Use only the antenna(s) available from RITRON
for this model. DO NOT attempt to substitute any
other antenna.
•Keep talk times as short and infrequent as
possible. DO NOT depress the PTT button when
not actually wishing to transmit. The radio is
equipped with an internal timer to limit continuous
transmit times.
•When transmitting, hold the radio in front of the
mouth at a distance of at least 4 inches. DO NOT
hold the radio in such a manner that the antenna
is next to, or touching, exposed parts of the body,
especially the face or eyes while transmitting.
•In belt mounted applications, when transmitting,
remove the radio from the belt and hold away from
the body at least 4 inches.
•When using external headset accessories, hold
the unit away from the body at least 4 inches while
transmitting.
•DO NOT allow children to operate the radio.

BATTERY CARE SST-442
5
CHARGING
The handheld is powered by a rechargeable battery,
which fits into the radio case (see FIG-1).
The battery pack can lose its charge during storage
and shipment, and should be fully charged before the
radio is used. Thereafter, the battery should be
charged overnight after each day of use, to ensure
peak radio performance for the next day. Using the
cube charger (model BC-A), the battery should
charge completely in 12 hours.
To charge the battery using a RITRON cube charger -
plug the charger cord into the smaller of the two jacks
on top of the radio. Then plug the cube into a 110
VAC outlet. The green lamp lights while the battery is
charging, and should go off only when the cube is
unplugged.
Two charger contacts, visible through the bottom of
the radio case, allow the battery to be charged using
an optional RITRON drop-in charger (model BCC-
PS). The battery pack may be charged inside or
outside of the radio case.
To charge the battery using a drop-in charger (model
BCC-PS) - plug the drop-in charger into a 110 VAC
outlet. Set the portable or battery into the charger.
Each battery contact must rest on a charger contact
pin.
NOTE: A new battery must be cycled (charged and
discharged) several times before it will reach
its maximum charge capacity.
PRECAUTIONS
•Use only RITRON-supplied chargers; other
chargers might cause fire, explosion, or other
damage to the radio.
•Do not "fast-charge" a brand new battery pack.
Otherwise, the battery might be damaged.
•Once the battery has been charged fully using
the normal rate, the fast rate may be used
thereafter.
•Do not fast-charge a battery pack that is fully
charged. This can shorten battery life.
•Do not charge or replace a battery in an
explosive atmosphere. Contact sparking can
ignite an explosion.
•Do not dispose of a battery in fire. An explosion
might result.
•Do not charge the battery in temperatures colder
than about 45°F. Electrolyte leakage can occur
and ruin the battery.
•Charging in temperatures above approximately
95°F will not harm the battery, but can reduce its
charge capacity.
BATTERY REPLACEMENT
To replace the battery in the SST-442:
1. Hold the radio as shown in FIG-1(A)
2. Use your thumbnail to open the Door Latch, as
shown in FIG-1(A).
3. Lift and rotate the Battery Access Door to release
it as shown in FIG-1(B).
4. Use the Pull-tab to pull the Battery Pack out of
the case as shown in FIG-1(C).
5. Insert the replacement Battery Pack as shown in
FIG-1(C). Push the Battery in as far as possible.
6. Replace the Battery Access Door. Secure it by
closing the Door Latch as shown in FIG-1(A).
7. Be certain to firmly lock the Door Latch, as
shown in FIG-1(A).
BATTERY
ACCESS
DOOR
PULL-TAB
FIG-1: Batter
y
Replacement
(
A
)
(
B
)
(
C
)
LATCH
CLOSED
LATCH
OPEN
BATTERY
ACCESS
DOOR

BATTERY CARE SST-442
6
BATTERY MAINTENANCE
With daily use and recharging, a battery’s service life
is about one year. To ensure maximum service life,
follow these guidelines:
•DO NOT discharge a battery that is already “run
down.” If the battery cannot power your radio,
recharge the battery.
•DO NOT overcharge a battery. The standard
battery should not be left to charge continuously.
•Condition battery packs once a month as
directed in Battery Conditioning.
•Condition batteries that are run down.
•Charge batteries for 16 hours before storage,
and for 16 hours once a month thereafter.
•DO NOT charge batteries in temperatures colder
than about 45°F. Charging batteries in
temperatures above 95°C. does not harm them,
but can reduce charge capacity.
It is time to purchase a new battery:
•When the radio’s transmitter coverage decreases
or does not work at all.
•When the radio quits working after just a few
hours of use, even with a full overnight charge.
•When the battery is more than two years old.
The date of manufacture is stamped on every
battery. The first two digits indicate the year, the
last two digits the week.
BATTERY CONDITIONING
Due to the extended run time of the SST-442 radio,
some users may never fully discharge the battery
pack during normal use. Achieve maximum battery
life by fully discharging the battery periodically to
condition it.
After exposing the battery pack to many cycles of not
fully discharging it before recharging, the radio may
exhibit reduced battery capacity. This reduced
capacity is evident when, after several hours of use,
battery voltage drops while the radio is transmitting,
causing the radio to emit a dead battery warning tone
and shut itself off.
Condition battery packs by the following procedure as
either a preventive measure, or if you suspect
reduced capacity:
1. Use your radio throughout a normal working day
without charging.
2. Press and hold the On/ Volume Up and Volume
Down/ Off buttons simultaneously for 8 seconds
to place the radio in "open squelch" mode.
3. Release both buttons when you hear the radio
beep rapidly; it will then emit a loud "rushing"
noise. Press On/ Volume Up to maximize this
noise.
4. Put the radio away in a secure place (possibly a
desk drawer), where nothing can press against
the buttons to accidentally turn it off or cause it to
transmit. Allow the radio to run until it shuts off
when the battery is completely discharged. A
typical battery pack may require up to 8 hours to
completely discharge.
5. When the radio has shut off, charge it overnight
for 12-14 hours. The battery will be ready for use
with renewed capacity.

OPERATION SST-442
7
CH
ON OFF/HOLD
VOLUME
Antenna
Vol Down/Off
On/Vol Up
Audio
Accessory
Jack
Jack Cover
Charge Jack
Speaker
Microphone
Push-to-Talk
Channel
Selector
Battery Access
Door
(Case bottom) Battery Charger
Contacts
(Case bottom)
Fig. 2 Controls and Accessory Connectors
DESCRIPTION OF CONTROLS AND
CONNECTORS
Antenna
The flexible antenna radiates and receives radio
signals. Before using the radio, be sure the
antenna base is threaded fully into the radio’s
antenna bushing.
Use only the antenna(s) available from RITRON
for the SST-442. Do not attempt to substitute
with any other antenna.
On/Volume Up
This button switches on the radio, then increases
the volume if you continue to press.
Volume Down/Off
This button decreases the volume, then shuts off
the radio if you continue to press.
Push-To-Talk
The PTT activates the transmitter, and must be
held down while you talk into the microphone.
Release the PTT button to receive.
Channel Selector
Pressing this button selects the next channel.
When the maximum number of channels is
reached and you press this button, the radio
resets to channel 1.
Audio Accessory Jack
This jack connects speaker audio to optional
accessories, such as a remote speaker/
microphone or an earphone. For accessories
that have a two-plug connector, the smaller plug
is inserted into the charge jack.
This jack is also used to program the radio using
the optional PC programming kit.
Charge Jack
The battery may be charged through this jack
using a standard RITRON wall socket charger
cube. This jack also connects microphone audio
to the optional remote speaker/microphone.
Microphone
The microphone converts your voice into
electrical impulses, which are carried with your
broadcast to receiving radios. Hold the radio
about four inches away and talk into the
microphone while transmitting. Shouting does
not improve the listener’s reception.
Speaker
The speaker allows you to hear calls on your
channel.
Jack Cover
This rubber cover seals out dust and moisture, etc. Snap the
cover into the audio accessory and charge jack openings
when the jacks are not being used.
Battery Access (Case Bottom)
The battery door on the case bottom may be removed to
access the battery. (Refer to the Battery Replacement section
of this manual.)
Drop-in Charger Contacts (Case Bottom)
Two charger contacts in the bottom of the SST-442 radio case
allow the battery pack to be charged using an optional
RITRON drop-in charger (model BCC-PS.)