SPH 255DT
SPU 554KT
Two-Way FM Transceiver
Operating Guide
RELM WIRELESS CORP.
7100 Technology Drive
West Melbourne, FL 32904
OMSPH255DT
7100 Technology Drive
West Melbourne, FL 32904
©2000 RELM Wireless Corporation. All Rights Reserved
OMSPH255DT
WIRELESS CORPORATION
Safety Information
Through the provisions of the Occupational Safety and
Health Act (OSHA) of 1970, the United States
Department of Labor has established an electromagnetic
safety standard which applies to the use of two-way radio
equipment. The proper use of this transceiver will result
in exposure below the OSHA limit.
The following precautions shall be observed:
■ DO NOT operate the transceiver of any radio
equipment with the antenna touching, or close to, the
eyes, faces, or exposed body parts.
■ DO NOT operate the transmitter of any radio
equipment unless all the Radio Frequency (RF)
connectors are secure and any open connectors are
properly terminated.
■ DO NOT operate the transmitter of any radio
equipment near electrical blasting caps or in an
explosive environment.
■ DO NOT let children operate any
transmitter-equipped radio equipment.
Have your radio equipment installed and serviced by a
qualified technician.
Rechargeable Nickel-Cadmium
Battery Pack Warning
This radio contains a Rechargeable
Nickel-Cadmium Battery Pack. Cadmium is a
chemical known to the State of California to cause
cancer. The Nickel-Cadmium Battery Pack
contained in this radio may explode if disposed of
in a fire.
Do not short circuit this Nickel-Cadmium Battery Pack.
Do not charge the Rechargeable Nickel-Cadmium
Battery Pack except with the recommended chargers.
Rechargeable Nickel-Cadmium Battery Packs
Must Be Recycled or Disposed of Properly!
Residents of Minnesota should contact
1-800-225-PRBA for information concerning
reclamation and disposal of Rechargeable
Nickel-Cadmium Battery Packs. Residents outside of
Minnesota should contact their local authorities for
information concerning reclamation and disposal of
Rechargeable Nickel-Cadmium Battery Packs.
Caution: RELM does not represent this radio to be
waterproof. Do not use the radio in damp or
high-moisture environments.
- 17-
Two-year Limited Warranty
WARRANTOR: RELM Wireless Corporation
(“RELM” or “Warrantor”).
ELEMENTS OF WARRANTY: RELM Wireless
Corporation warrants to the purchaser that all new Radio
equipment of RELM’s manufacture shall be free of
defects in material and workmanship. Equipment and
accessory items not manufactured by RELM carry the
standard warranty of the manufacturer thereof.
WARRANTY DURATION: The warranty period for all
parts is two (2) years. The warranty period shall
commence upon installation of the equipment or two (2)
months from the date of shipment from the factory,
whichever comes first.
The warranty shall terminate and be of no further effect
two (2) years from its origin or at the time the Product is
(a) damaged or not maintained as reasonable, (b)
modified, (c) improperly installed, (d) is repaired by
someone other than Warrantor or Authorized Warranty
Repair Station for a defect or malfunction covered by this
Warranty, or (e) used in a manner or purpose for which
the Product was not intended or in an environmental
condition for which the Product was not intended.
STATEMENT OF REMEDY: Where permitted by law,
this Warranty is in lieu of all other Warranties expressed
or implied, including warranties of merchantability or
fitness for a particular purpose, and no representative or
person is authorized to assume for us any other liability.
This warranty shall not extend to incidental or
consequential damages arising from operation of
Product(s) which are subject of this Warranty. Some
States do not allow limitation of implied warranties so the
above limitations may not be applicable. You may have
rights as defined by individual State law.
WARRANTY REGISTRATION CARD: In order to
facilitate the service under this Warranty, Purchaser
should return the Warranty Registration Card to
Warrantor. However, return of the Warranty Registration
Card is not a precondition of this Warranty. This
Warranty will be observed by the Warrantor whether or
not the Warranty Registration Card is returned, on the
condition that other evidence, satisfactory to RELM, of
the date of the original installation or purchase is
provided to the Warrantor.
PROCEDURE FOR OBTAINING PERFORMANCE OF
WARRANTY: To obtain warranty service, the Customer
must return the radio properly packed, freight prepaid, to
Warrantor or any Authorized Warrantor Repair Station. It
will be returned freight prepaid.
- 1 -
Table Of Contents
Introduction ............................................................. 2
Congratulations .................................................. 2
Description ......................................................... 2
Service ............................................................... 2
Features ............................................................. 2
Programmable Features ................................... 4
Unpacking ................................................................ 5
Getting Started ....................................................... 6
Charging the Battery .......................................... 6
Attaching/Removing the Battery ........................ 6
Installing the Antenna ........................................ 7
Attaching the Belt Clip ....................................... 7
Operation ................................................................. 8
LCD Display ....................................................... 8
TransmiVReceive Indicator ................................ 8
Applying Power and Setting the Volume............ 9
Changing Channels .......................................... 9
Receive ............................................................ 10
Channel Scan .................................................. 10
Dual Watch ...................................................... 10
Modify the Channel Scan List
with Channel Lock Out ...................................... 11
Drop Out Delay ................................................. 11
Transmit ............................................................11
Transmit During Scan ....................................... 11
Two-Tone Decode Operation ........................... 12
Transmit Time Out Timer ................................. 12
Busy Channel Lockout (BCLO) ........................ 12
A/B Key Functions ........................................... 12
DTMF Keypad Operation ................................. 13
Special Features ................................................... 14
BatterySave ..................................................... 14
Function Tones ................................................. 14
Using VOX ....................................................... 15
Optional Accessories &
Replacement Parts .......................................... 15
Technical Support and Service ........................ 16
Specifications ................................................... 16
Two-year Limited Warranty ........... inside back cover
- 16 -
Technical Support and Service
Your Uniden dealer can provide you with technical
assistance and infommation. If your radio does not
perfomm properly, take it to a Uniden dealer for
servicing. The radio contains no user-serviceable
parts. Unauthorized adjustment will void the warranty
and may cause illegal radio operation. Be sure that a
qualified technician services your radio equipment.
When servicing the radio, use only factory-authorized
replacement parts.
Specifications
Power .............Rechargeable Battery Pack (APX1115)
Temperature Range ........................... - 30°C to +60°C
Operating Frequencies
SPH 255DT ......................... 146 MHz to 174 MHz
SPU 5S4KT ........................438 MHz to 470 MHz
Nominal Dimensions
(with Battery) ............ 2.36" (W) x 1.77" (D) x 5.55" (H)
Weight (with Battery) ........................................ 1.08 lb.
Duty Cycle ..... 5, 5, 90 (TX, RX, STDBY)–8Hr Typical)
- 2 -
Introduction
Congratulations
You now own the best value in portable radios, a
Uniden professional communications radio. The
SPH 255DT and SPU 554KT give you consistent,
outstanding perfommance in virtually all conditions
and situations.
Your SPH 255DT or SPU 554KT Two-Way FM
Transceiver offers many special features. Read this
Operating Guide completely to be sure you are
getting the most from the radio.
Description
The SPH 255DT and SPU 554KT are 99-Channel
portable Two-Way FM Transceivers. They are
microprocessor-controlled, frequency-synthesized,
and programmable. They are lightweight, rugged, and
fit easily in your hand.
The SPH 255DT operates in the 146 to 174 MHz
range with a maximum RF power output rating of 5
watts The SPU 554KT operates in the 438 to 470
MHz ranges with a maximum RF power output rating
of 4 watts
Service
If your radio does not work properly, take it to a
Uniden dealer for servicing. These radios contain no
user serviceable parts. Unauthorized adjustments will
void the warranty and may cause illegal radio
operation. Make sure that a qualified technician
services your radio equipment. When servicing these
radios, use only factory authorized replacement parts.
Features
■ Scan Mode—Monitors the programmed scan list.
(You can temporarily lock out selected channels.)
■ External Speaker/Microphone Jacks—Allows use
of an optional speaker, microphone, or headset for
improved operation in special situations.
Note:
With the headset option, you can activate the
VOX feature for hands-free transmit/receive
operation. See Using VOX" on Page 14.
■ Channel/Function LCD
■ Channel Monitor Switch
■ Battery Low Indicator
■ DTMF Keypad
■ User-Programmable Channel Scan List
■ TXJBusy LED
- 15-
Using VOX
The VOX feature automatically switches the radio
between the transmit and receive modes when you
speak into the microphone. This feature may be
programmed into your radio by your Dealer. You must
also have the optional headset plugged into the radio.
When you talk, the radio switches to the transmit
(talk) mode. When you stop talking, it switches back
to the receive mode.
Optional Accessories &
Replacement Parts
The following Optional Accessories and Replacement
Parts are available from your Uniden Dealer.
■ Rechargeable Battery Pack (APX1115)
■ Battery Chargers: Desktop Rapid Charger
(APX140 base and APX140PS adapter) Desktop
Standard Charger (APX141 base and APX141 PS
adapter)
■ APX155 Charging Cup (for use with APX140 or
APX141)
■ External Microphone with Speaker
■ Headset (necessary for VOX operation)
■ Operating Guide (OMSPH255DT)
■ SPH255DT Antenna (APX151-6 or 152-6) See
your Dealer for exact model
■ SPU554KT Antenna (APX452-6)
- 3-
Controls and Functions
- 14 -
Special Features
Battery Save
In Battery Save or “sleep” mode, the radio receives
only when it detects an RF carrier. This helps reduce
battery power consumption.
Function Tones
The radio is equipped with several tones to indicate
error conditions or confirm functions have occurred.
Power On Tone - a short high pitch tone indicating
the radio has powered up normally.
Malfunction Tone - a long low tone at power on
indicating a radio problem. If it persists, return the
radio to your Uniden dealer for repair.
Low Battery Tone - two long low tones indicating the
battery must be recharged.
Function Enable Tone - a very short high pitch tone
indicating the key function has been turned on.
Function Disable Tone - two short high tones
indicating that the key function has been turned off.
No Function Tone - four tones alternating low-highlow-high, indicating the key function is not allowed.
Down Channel Tone - a short, low tone occurring at
every down channel change.
PTT Error Tone - a low tone sounding as long as the
PTT is held, if transmit is not allowed on the selected
channel.
BCLO Tone - alternating high/low tones sounding as
long as PTT is held if the channel is busy. TOT
Caution Tone - short high pitch beeps sounding every
second, beginning 5 seconds before transmitter
shutoff occurs.
TOT Error Tone - a high pitch tone sounding as long
as the PTT is held, after TOT has occurred.
Priority Tone - a short high pitch beep sounding
during scan when the Priority Channel is received and
when the programmed Priority Channel is selected.
Two-Tone Decode Tone - four short high pitch beeps
sounding when a two tone signal is decoded, if
programmed for tone-only decode indication. The
beeps recur until a key is pressed.
Two-Tone Decode (with Voice) Tone - Two short
high pitch beeps sounding when a two tone signal is
decoded if programmed for tone and voice indication.
- 4 -
Programmable Features
The channel frequencies and options (such as VOX,
Tone-Coded channels, and scan channels) have been
pre-programmed into your radio by your Uniden
Dealer. Check with your Dealer for the specific
features in your radio.
■ Scan Type
■ Scan Dropout Delay
■ Transmitter Time Out Timer
■ Battery Save
■ Busy Channel Lockout
■ Function Beep
■ CTCS S/DCS/2-Tone Rece ivelT ran sm it Codes
■ TX Power High/Low
■ A/B Key Functions
■ VOX Sensitivity and Hang Time
- 13-
TAC Function - allows “talking around” the repeater by
shifting the transmit frequency to the channel's receive
frequency. Pressing the key will cause the Enable Tone
to sound and the LCD “TAC” indicator to begin blinking.
Press the key again to disable the TAC function. The
TAC function is automatically disabled when the channel
is changed or the radio is powered off.
TX HULO Power - allows channels programmed for high
power to be switched to low power. Activate by pressing
and holding the key for at least 1.5 seconds. The LCD
“LOW POWER” display will appear and the tone will
sound. If pressed on channels already programmed for
low power, an error tone will sound. To restore high
power operation, press and hold again for 1.5 seconds.
The LCD “HIGH POWER” display will appear and the
corresponding tone will sound.
VOX Disable/Enable - allows disabling the VOX mode
on channels programmed for automatic VOX operation.
On those channels, pressing the key will change the
LCD VOX display from continuous to blinking, sound the
Disable Tone and cause VOX operation to stop. Press
the key again to restore nommal VOX operation.
Home Channel Select - allows one-touch selection of a
pre-programmed channel. Both the A and B keys may be
programmed for this function.
TX Disable - inhibits the transmit function when active.
To disable transmit, press and hold the key for at least
1.5 seconds. The LCD “TX DISABLE” display appears
and the Disable Tone sounds. Transmit on all channels
will be inhibited when activated. Press and hold again for
at least 1.5 seconds to enable normal transmit operation.
CTCSS/DCS Disable/Enable - disables the CTCSS/
DCS coded squelch programmed for the selected
channel. To do so, press and hold the key for at least 1.5
seconds. The LCD “S_CODE OFF” display will appear
and the Disable Tone will sound. Press the key again to
restore the programmed coded squelch operation. The
programmed operation is automatically restored when
the channel is changed or the radio is powered off.
DTMF Keypad Operation
The DTMF keypad may be programmed to allow access
to the telephone network. DTMF operation is possible
only on channels designated for that function. Pressing
PTT will cause the LCD MDTMF INPUT display to
appear for 3 seconds if the selected channel is
programmed for DTMF operation. The first DTMF digit
must be pressed within the 3 second period. After
pressing the first digit, the PTT may be released and
transmit will continue as long as extra digits are pressed
within the programmed “hang time.”
- 5-
Unpacking
The following should be included with your two-way
radio:
■ Transceiver Unit
■ Antenna
■ Belt Clip
■ Operating Guide (OMSPH255DT)
■ Nickel-Cadmium Rechargeable Battery Pack
(APX1115)
If any of these items are missing from the box, contact
your Uniden Dealer for help.
FCC Licensing
Before you transmit with your radio, you must
have the proper license issued by the Federal
Communications Commission (FCC). Your Uniden
Dealer can tell you what is required, and can help
you with all your future communication needs.
Features, specifications, and availability of optional
accessories are all subject to change without notice.
- 12 -
SELECTED CHANNEL - If programmed for user selection,
the current selected channel will be the transmit channel,
which may be changed at any time during scan operation.
You may select the desired transmit channel by use of the
Channel Up or Down keys, the A/B keys (if programmed
for Home Channel Select function) or you may use the 0-9
keys on the keypad for direct channel selection (see
Changing Channels).
Two-Tone Decode Operation
Any channel may be programmed for Two-Tone Decode
operation. When any such channel is selected, the radio
remains muted until someone in your system calls you.
When a call is received, the LCD CALL indicator
appears, the TransmiVReceive indicator blinks orange,
the two-tone decode alert tones sound (see Function
Tone section), and the caller's voice may be heard,
depending on programming. If programmed for no voice
alert, press the Monitor key to unmute the receiver and
hear the call orange LED may be turned off by pressing
any key. The LCD CALL indication is turned off by
pressing the PTT, Monitor or SCAN key. After the call is
completed, the radio can be readied for the next call by
pressing the Monitor key or by changing the channel,
then returning to the two-tone channel.
Transmit Time Out Timer
Continuous transmission time may be limited by
programming selection. Five seconds before the timeout, caution beeps will sound every second. After five
seconds, transmission will stop and an error tone will
sound as long as the PTT is held. When you release the
PTT button, the Time Out Timer is reset.
Busy Channel Lockout (BCLO)
The radio may be programmed to inhibit transmit while a
signal is being received. If so, an error tone will sound if
PTT is pressed while the channel is busy. BCLO may
also be programmed to allow transmit to occur if you are
receiving a signal from someone in your system,
allowing you to maintain control of a repeater during your
conversation.
A/B Key Functions
The A and B keys can be programmed for any of several
functions as described below. If programmed for no
function, pressing the keys will only cause the error tone
to sound. Check with your dealer or equipment provider
to determine the programmed function of these keys.
Key Lock - prohibits activation of
SCAN
▲, ▼,
L/O
and
the DTMF keys. When pressed, the LCD displays
“K_LOCK ON” for 1.5 seconds and the Enable Tone
sounds. To restore nommal operation of all keys, press
and hold the key for at least 1.5 seconds. The LCD will
display “K_LOCK OFF” and the Disable Tone will sound.
- 6 -
Getting Started
Before you can use your radio, you must install and
charge the battery and install the antenna as follows.
Charging the Battery
Your radio is powered by a specially-designed, nickelcadmium battery. You should fully charge the battery
before operating the radio. Only use one of the
following chargers.
■ Model APX140 Desktop Standard Charger
■ Model APX141 Desktop Rapid Charger
Follow the charging instructions that come with the
charger. Also, be sure to observe the following
waming/safety infommation for nickel-cadmium
batteries (on the inside front cover of this Operating
Guide).
Attaching/Removing the Battery
To attach the battery to the radio, align the slots in the
battery with the hooks on the radio as shown. Then,
slide the battery toward the top of the radio until it
locks into place.
To remove the battery from
the radio, push the battery
release lever toward the
front of the radio and slide
the battery toward the
bottom of the radio.
- 11-
Modify the channel Scan List
with Channel Lock Out
Deleting channels (from the channel scan list)
increases the scanning speed.
Use ▲ or ▼ to select the desired channel and press
L/O
The channel display increments to the next higher
channel TheLCD UO indicator appears when the
locked out channel is reselected.
To remove the lock-out condition from a channel,
manually select the channel and press
L/O
again.
Nuisance channels may also be deleted while scan is
active, by pressing
L/O
while receiving the channel or
during the delay after the signal is gone but before
scan resumes.
Drop Out Delay
While scanning, the radio stops at a busy channel and
receives a transmission. When the received call is
over, it resumes scanning after a short delay.
Transmit
1. Use ▲ or ▼ to select the desired channel.
2. Before you transmit, press
MON
and listen for
activity on the channel. Also check the Transmit/
Receive Indicator. If it is blinking RED, the channel
is locked out, and transmit may be inhibited,
depending on programming.
3. When the channel is clear, press the PTT switch to
transmit. The TX LED lights RED when you
transmit. Hold the radio with the microphone
approximately two inches in front of your mouth
with the antenna at approximately a 45-degree
angle away from your head. Speak in a clear,
normal, conversational voice.
4. When you are through speaking, release the PTT
switch and listen for an answer.
Transmit During Scan
Depending on how your radio is programmed, you will
transmit on a particular channel during the scan
function.
TALK BACK- If programmed for Talk Back operation,
transmit will always occur on the last received
channel, even if scan has resumed when the PTT
button is pressed.
PROGRAMMED CHANNEL- If a specific channel has
been programmed, transmit will always occur on that
channel.
- 7-
Installing the Antenna
To install the antenna, align
it with the antenna
connector on the top of the
radio and turn it clockwise
until it seats snugly against
the radio.
Attaching the Belt Clip
Attach the supplied belt clip as shown.
- 10 -
2. A/B Key Selection - Either or both of the A and B
keys may be programmed for Home Channel
selection. Press the programmed key
A
or
B
to instantly select the programmed Home Channel.
3. Direct Channel Selection - The numeric keypad
0-9 keys may be used to directly select the desired
channel. Press one or two digits and the Channel
Up key (s) to select a channel. For example, press
4
GHI
7
PQRS
s to select channel 47. If ▲ is not pressed
within 5 seconds after pressing the digit keys, the
entered digits will be ignored. During the 5 second
period, the ▼ key may be used to clear the entered
digits from the display.
Receive
When a call is received,
the TransmiVReceive
Indicator blinks RED. If
the signal is coded with
CTCSS, DCS, or 2-Tone
Code, the CALL indicator
appears on the LCD.
Channel Scan
In the scan mode, the radio alternately monitors each
channel until it receives a call. You can scan all
channels in the programmed scan list, or you can
modify the scan list by locking out individual channels
from being scanned.
1. Press
SCAN
to begin
scanning. The LCD SC
indicator begins to flash.
2. The radio stops on any channel that receives a
call, the LCD SC indicator is displayed
continuously and you hear the caller. When the
transmission stops, the radio resumes scanning
after a brief delay.
3. To disable scanning, press
SCAN
Dual Watch
If your radio has been programmed for Priority Channel
operation, the radio will sample the Priority Channel
between any other receiving channel during Scan Mode.
This is usually the channel you use for most of your
communications. (Depending on programming, the
Priority Channel may be pre-programmed or it may be
the channel you select during scan.)
During scan the LCD PRI
indicator will be displayed
continuously when the
Priority Channel is being received.
- 8 -
Operation
LCD Display
The liquid crystal display
(LCD) has 10 characters to f
designate the selected
channel by number or
name. Above the channel
designation area is a row of
indicators that show which
features are enabled.
MON
Monitor function is enabled
SC
Scanning in operation
PRI
Priority Channel
TAC
Repeater talkaround is enabled
UO
Channel removed from Scan List
VOX
Voice-Operated Transmit activated
CALL
Call Received with CTCSS/DCS/2-Tone Coding
BATT
Blinks when the Battery Power is low
Transmit/Receive Indicator
The TransmiVReceive
Indicator shows different
colors depending upon the
operation:
Transmit:
Steady RED
Channel Busy:
Blinking RED
2-Tone-Coded Signal:
Blinking ORANGE
Monitor ON:
Steady ORANGE for 4 seconds
- 9-
Applying Power and Setting the Volume
1. Turn the radio on by
pressing the
POWER
button
to the in position.
The display lights and
shows the last-selected
channel designation.
Note: To turn the radio off, release the 63 button
to the out position.
2. Press the Monitor Key
(
MON
)
Adjust the speaker l
volume to a comfortable UP
level by pressing the , pi
Volume Up (
) or
Volume Down (
) Key
Note: If you hold down either of the keys, the
volume steps rapidly in the selected direction.
3. Press (
MON
) again.
Note: While Monitor is ON, your radio may detect
(on the selected channel) transmissions
from stations outside your own system, as
well as transmissions within your system.
Changing Channels
1. Up/Down Key
Selection- Press the
Channel Up or Channel
down key (▲ or ▼ ) to
display the desired
channel.
An up-channel or down-channel tone sounds with
each channel change. If you press and hold either
key, the radio changes channels rapidly.
(If programmed with a Estops channel changes will
stop when the highest or lowest channel number
has been reached.)
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