Uniden Two Way Radio SMH250D User Manual

SMH250D/SMU250K  
User’s Guide  
W I R E L E S S C O R P O R A T I O N  
7100 Technology Drive  
West Melbourne, FL 32904  
©2000 RELM Wireless Corporation. All Rights Reserved  
RELM WIRELESS CORPORATION  
7100 Technology Drive  
ULZZ01101ZZ  
West Melbourne, FL 32904  
 
Registration Card is returned, on the condition that other evidence,  
satisfactory to Uniden, of the date of the original installation or  
purchase is provided to the Warrantor.  
Contents  
Safety Information .......................................................................................... 2  
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.  
Introduction .................................................................................................... 4  
Congratulations ........................................................................................ 4  
Description ............................................................................................... 4  
Service...................................................................................................... 4  
Features .................................................................................................... 5  
Programmable Features............................................................................ 5  
Unpacking....................................................................................................... 6  
Controls and Functions ................................................................................... 7  
General Operation ......................................................................................... 8  
LCD Display ............................................................................................ 8  
Applying Power and Setting the Volume ................................................. 8  
Channel Selection .................................................................................... 9  
Transmit ................................................................................................... 9  
Telephone Operation ............................................................................... 9  
Receive................................................................................................... 10  
Channel Scan ......................................................................................... 10  
Priority Scan........................................................................................... 10  
Modify the Channel Scan List with Channel Lock Out......................... 10  
Drop Out Delay .......................................................................................11  
Transmit During Scan .............................................................................11  
Transmit Time Out Timer........................................................................11  
Busy Channel Lockout (BCLO) ........................................................... 12  
A/B/C Key Functions............................................................................. 12  
Function Tones ....................................................................................... 13  
Telephone Interconnect Functions ......................................................... 14  
Radio Installation Considerations................................................................. 15  
Power Requirements .............................................................................. 15  
Antenna .................................................................................................. 15  
Mounting ................................................................................................ 15  
Operational Check.................................................................................. 16  
Accessories............................................................................................ 16  
Technical Support and Service............................................................... 16  
Two-year Limited Warranty.......................................................................... 17  
18  
3
 
Introduction  
Two-year Limited warranty  
WARRANTOR: RELM Wireless Corporation (“RELM” or  
“Warrantor”).  
Congratulations  
You now own the best value in mobile radios, a Uniden professional  
communications radio. The SMH250D and SMU250K give you  
consistent, outstanding performance in virtually all conditions and  
situations.  
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.  
Your SMH250D or SMU250K Two-Way FM Transceivers offer many  
special features and can be programmed by your Uniden dealer to  
provide the features that best meet your needs. Read this Operating  
Guide completely to be sure you are getting the most value and  
performance from your new radio.  
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.  
Description  
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.  
The SMH250D and SMU250K are conventional mobile Two-Way FM  
Transceivers. They are microprocessor-controlled, frequency-  
synthesized, and programmable. They are rugged and designed for  
easy installation in small spaces.  
The SMH250D operates in the 146 to 174 MHz range and the  
SMU250K operates in the 450 to 494 MHz range. Both have a  
maximum RF power output rating of 25 watts.  
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.  
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.  
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  
4
17  
 
controls. Be sure the equipment does not interfere with the vehicle's  
operation.  
Features  
Up to 9'3 programmable channels  
Operational Check  
Carrier squelch and multiple CTCSS/DCS operation  
10 character Channel/Function LCD  
After installation, a complete operational check by your Uniden Dealer  
will assure you of a quality installation.  
User-Configurable Channel Scan List  
Accessories  
Ten number pre-programmed Phone Book  
Standard Microphone .......................................................... AMX100A  
DTMF Encode Microphone.................................................. AMX101A  
Heavy Duty Microphone ..................................................... AMX105A  
Mobile Power Cord w/Fuse (15A) ....................................... AMX120A  
Base Station Microphone......................................................... AMX151  
External Speaker (4 ohm, 10 Watt).......................................... AMX250  
110VAC Power Supply (with built-in speaker) ................... ST14P1001  
220VAC Power Supply (with built-in speaker) ................... ST14P1002  
Programmable Features  
The operating frequencies and options 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  
Transmit Dwell Time  
Transmitter Time Out Timer  
Busy Channel Lockout  
Function Tone  
Technical Support and Service  
TX Power High/Low  
A/B/C Quick Key Functions  
Your Uniden dealer can provide you with technical assistance and  
information. If your radio does not perform 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.  
16  
5
 
Unpacking  
Radio Installation Considerations  
The following should be included with your two-way radio:  
All Uniden radios and associated accessories are tested before  
shipment to ensure operational status. However, since vehicle  
configuration in which Uniden radios and accessories are installed are  
non-standard, Uniden recommends the following installations  
considerations.  
Transceiver Unit  
Power Cord  
Mounting Bracket  
Operating Guide (OM)  
Power Requirements  
The SMH250D and SMU250K require a 13.6V DC, 10 ampere power  
source with a negative ground. Install a fuse in the power leads  
near the power source to protect the power source compartment  
and passenger compartment from fire and electrical hazards. (The  
AMX 120A Power Cable is equipped with an in-line 15 ampere fuse.)  
If the radio is connected directly to the vehicle battery, a fuse must be  
installed as close to the battery terminal as possible.  
If any of these items are missing from the box, contact your Uniden  
Dealer for help.  
Features, specifications, and availability of optional accessories arc all  
subject to change without notice.  
Route power leads to minimize proximity to other electrical systems  
such as instruments, engine electrical components, braking systems,  
entertainment systems, etc.  
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.  
Secure power leads to supporting structures or components with  
insulated clamps that completely isolate the power leads from the  
supporting structures or components. When power leads are routed  
through a firewall, bulkhead, or similar structure, use a rubber  
grommet to protect power leads from chafing.  
Antenna  
Follow antenna manufacturer’s mounting instructions. Mount antenna  
in a location which gives the highest unrestricted radiation pattern. Use  
low loss, 95% shielded, Teflon coaxial cable between antenna and  
radio antenna jack. Keep antenna cable length short to insure  
maximum power output.  
Mounting  
Mount the equipment with your safety and the safety of others in  
mind. Do not obstruct the operator's physical or visual access to the  
controls. Ensure easy access to the microphone and radio  
6
15  
 
Function Disable Tone - two short low tones indicating that  
Controls and Functions  
the key function has been turned off.  
No Function Tone - a low/high/low/high tone sequence  
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.  
Microphone Jack - Allows attachment of standard, DTMF or base  
station microphone.  
TOT Caution Tone - short high pitch beeps sounding every  
second, beginning 5 seconds before transmitter shutoff occurs.  
On/Off/Volume Control - Allows the radio to be powered off and on  
and the volume to be adjusted.  
TOT Error Tone - a high pitch tone sounding as long as the  
PTT is held, after TOT has occurred.  
Up/Down Select Key - Allows selection of channels.  
Scan Key - Allows automation of scan function.  
Priority Tone - a short high pitch beep sounding during scan  
when the Priority Channel is received and when the  
programmed Priority Channel is selected.  
Monitor Key - Allows channel monitoring before transmit.  
L/O - Allows channels to be added to or removed from the scan list.  
A/B/C - Option keys programmable for any of seven functions.  
Telephone Interconnect Functions  
Phone Book - Any of 10 pre-stored memory numbers can be recalled  
by the A/B/C quick keys. Press the A/B/C key to display the first  
number, then press again as many times as necessary to recall the  
desired number. When PHONE BOOK is displayed, press the UP/  
DOWN keys to scroll through the programmed numbers until the  
desired one is displayed. Press PTT to access dial tone on an  
interconnect repeater, then press PTT again to transmit the number.  
Numbers with more than 10 digits will automatically scroll to display  
the last 10 characters.  
DTMF Redial - The A/B/C quick keys may be programmed to recall  
the previously displayed Phone Book number for redial. To use this  
function, access dial tone on an interconnect repeater as described  
above, then press the A, B or C key and hold for 2 seconds. The last  
transmitted Phone Book number will be displayed and can be  
transmitted by pressing PTT.  
14  
7
 
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.  
General Operation  
LCD Display  
Home Channel Select - allows one-touch selection of a pre-  
programmed channel. Any or all of the A/B/C keys may be  
programmed for this function.  
The liquid crystal display (LCD) has 10 characters to designate the  
selected group or channel by number or name. Above the channel  
designation area is a row of indicators that show which features are  
enabled.  
TX Disable - inhibits the transmit function when active. To  
disable transmit, press and hold the key far 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.  
TX  
The unit is transmitting  
RX  
A signal is being received  
MON  
SCAN  
A/B/C  
The monitor mode is active  
Scanning is in operation  
Squelch Level Select - allows control of the squelch level of  
all channels, useful when operating in areas with high RF noise  
levels. When activated “TITE SQLCH” will be displayed for 2  
seconds, then the selected channel indicator will return and the  
corresponding A, B or C LCD indicator will illuminate. Press  
again to restore normal squelch operation, indicated by the  
“NRML SQLCH” display.  
Indicates the programmed functions are active.  
Option Control - allows control of an internal or external  
option, indicated by the illumination of the corresponding A/B/  
C LCD display.  
Function Tones  
Applying Power and Setting the Volume  
The radio is equipped with several tones to indicate error conditions or  
confine functions have occurred.  
1. Turn the radio on by turning the POWER/VOLUME knob  
clockwise. The display lights and shows the last-selected channel  
name or number.  
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.  
Note: To turn the radio off, turn the POWER/VOLUME knob  
counterclockwise to the OFF position.  
2. Press the MON key. Adjust the speaker volume to a comfortable  
level by turning the POWER VOLUME knob.  
Function Enable Tone - a short high tone indicating the key  
function has been turned on.  
3. Press MON again to restore coded squelch operation.  
8
13  
 
an error tone will sound as long as the PTT is held. When you release  
the PTT button, the Time Out Timer is reset.  
Channel Selection  
1. Up/Down Select - Press the Up/Down key (L or M) display the  
desired channel. An up-select or down-select tone sounds with  
each change. If you press and hold either key, the radio changes  
channels rapidly.  
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.  
(If programmed with a “stop”, channel changes will stop when the  
highest or lowest channel number has been reached.)  
2. A/B/C Key Selection - Either or all three of the A, B and C keys  
may be programmed for instant selection of a pre-programmed  
channel. Press the programmed key to instantly select the  
programmed channel.  
A/B/C Key Functions  
The A, B and C 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.  
Transmit  
1. Select the desired channel as indicated above.  
Key Lock - prohibits activation of the Scan, Up/Down, L/O  
and DTMF keys. When pressed, the LCD displays “K_LOCK  
ON” for 1.5 seconds and the Enable Tone sounds. To restore  
normal 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.  
2. Press the microphone PTT key. Keep the PTT button depressed  
while you transmit your message. Notice that the LCD TX  
indicator illuminates, indicating the transmit mode. If transmission  
is difficult, try to find a higher location with fewer obstructions  
between you and the repeater site. Release the PTT key when your  
message is finished.  
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.  
3. For best voice quality when transmitting hold the microphone  
about one inch from your mouth.  
Telephone Operation  
1. Select a channel allowing telephone access.  
TX HI/LO 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  
2. Press the PTT to access the system then release to gain dial tone.  
3. Transmit the number manually entered (requires a DTMF  
microphone) or recalled as described under Phone Book.  
12  
9
 
4. If someone answers, key the transmitter to talk and release to  
listen.  
and press SC. The channel display increments to the next higher  
channel. The LCD L/O indicator appears as the first character of the  
channel designator when the locked out channel is reselected.  
5. When transmission is complete, “hang up” the connection by  
pressing the # button on the keypad.  
Nuisance channels may also be deleted while scan is active, by  
pressing the L/O button while receiving the channel or during the  
delay after the signal is gone but before scan resumes.  
Receive  
Select the channel you want to receive as indicated above. Scan  
operation may be activated as described below to automatically  
monitor a number of channels.  
To remove the lock-out condition from a channel, manually select the  
channel and press L/O again.  
Drop Out Delay  
Channel Scan  
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.  
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.  
Transmit During Scan  
Depending on how your radio is programmed, you will transmit on a  
particular channel during the scan function.  
1. Press the SC key 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.  
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  
3. To disable scanning, press SC again.  
programmed, transmit will always occur on that channel.  
Priority Scan  
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 or the A/B/C keys programmed for instant  
channel select.  
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.)  
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  
Modify the Channel Scan List with Channel Lock Out  
Deleting channels (from the channel scan list) increases the scanning  
speed. Use the (L) or (M) to select the desired channel  
10  
11  
 

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