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Icom IC-F121


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Icom IC-F121Icom IC-F121S-51 Mobile Transceiver
The Icom IC-F121S-51 Mobile Transceiver is designed for use by small to large business, and small to mid-size police and emergency services. The IC-F121S is a mobile VHF 136-174 MHz radio with 50 watts of power. It is easy to operate and has a rugged and compact design. The F121S is perfect for those that want a basic, reliable mobile radio. The IC-F121S has 8 channels, a 4 watt front mount speaker, and large knobs and buttons. The F121S has built-in 2-Tone, 5-Tone, CTCSS and DTCS capabilities a... Read more

Brand: Icom
UPC: 731797215727


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User reviews and opinions

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Comments to date: 8. Page 1 of 1. Average Rating:
thenate 7:59am on Monday, October 4th, 2010 
Creative EP-830 Noise Isolating Earphones Very disappointed with these earphones, i bought them off the back of very good reviews i had read.
styg 11:20pm on Saturday, August 7th, 2010 
These came with my Dell XPS 1530 and I tried them for the first time and really was impressed. These came with my Dell XPS 1530 and I tried them for the first time and really was impressed.
ability 8:02am on Monday, July 12th, 2010 
Small price for big sound For $16.00, what can you say! I was quite pleased with the sound for such a small price. For this great price, not bad So I ordered these on Monday, early morning and after the item was finally shipped.
timarcher52 12:54pm on Tuesday, June 1st, 2010 
"This is my 3rd tape adapter for my iPod - first was Monster Cable, then Dynex (?) - which was the worst, and now this Sony one. "This sony cassette player with the attached ipod wire works really well. It is also easy to use.
eboytitan 1:37am on Tuesday, June 1st, 2010 
Very good....when they work! Bought my 2nd pair of these in February. Great value, and a decent sound... Headphones Arrived quickly. Earphones work very well but no good if your lug holes are smaller than the average person.
karmakar 7:14am on Wednesday, May 26th, 2010 
The only issue that I have found is that the rubber ear buds can compress at times - I simply pull them back out, but it can be anoying at times.
dpederson 9:01pm on Monday, May 3rd, 2010 
Sound quality??? After reading other review I am extremely surprised at what I am listening to. Amazing Creative EP-630 In-Ear Noise-Isolating Headphones (Black) I got a pair of these when I ordered my XPS computer system back in 2008.
Ratso 3:39am on Wednesday, March 17th, 2010 
The silicone fittings are changeable so you can choose the right size for your ears. Bad thing about that is that they tend to fall off now and then. Not only do I like bacon, but I love the way it smells when it is cooking Inexpensive, but sound great The wire is a little thin. Not a big deal. i used egg saver and got it in 4 days....not that bad as i thought it would be 1. good bass ; 2. crisp sound ; 3.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




ianews, your connection to Icom Americas Land Mobile Division! Keep up with the latest products, news and technical information in this newsletter.

June 2010

PCI Race Radios Puts Icom IC-F121 to the Ultimate Test
The bottom line is that communications are very important, says Scott Steinberger, owner and president of PCI Race Radios. It is important for safety as well as race coordination, he says. Teams use two-way radio for communicating between the race vehicle and the support vehicle and pit crews. Two-way radio is also essential for communicating via the Weatherman relay to report an emergency or ask for help. In many cases, reliable communications can make the difference between a DNF and a successful finish. When designing its in-vehicle communication systems, PCI Race Radios faced the obvious challenge of finding a two-way radio capable of withstanding continuous jarring motion. It also considered the radios range and the quality of its selective receiver due to high airtime saturation and interference during the race.
IN THIS ISSUE: PCI Race Radios Puts Icom IC-F121 to the Ultimate Test Meet Your Icom Team Taylor Stokes, Service Technician Upcoming APCO International Tradeshow - Houston, Texas Recent Changes to Our Website
2010 Icom America Inc. The Icom logo is a registered trademark of Icom Inc. The IDAS logo and name are trademarks of Icom Inc. All other trademarks remain the property of their respective owners. All information and specifications subject to change without notice or obligation. 10216
How durable are Icom radios? Tough enough to withstand breathtaking 40mile-per-hour motorsport crashes. How reliable are Icom radios? So reliable that the No. 1 off-road racing communications company uses Icom radios (the IC-F3011 and IC-F121 series) in the vehicle communications systems it designs for events like the Baja 500 and Baja 1000. Long Beach, Calif.-based PCI Race Radios, the foremost authority on building and maintaining radio systems for extreme motorsport races, has more than 25 years in the off-road racing industry. The company designs specialized two-way communications systems for race vehicles as well as systems for motorcycles/quads, support cars, and pit crews. Not only does PCI Race Radios design communications systems, it also puts its own products to the ultimate test by racing in events like the Baja 1000. Company teams have scored five Baja 1000 wins and numerous class championships over the years.

Continued on page 2

For People Who Make Smart Choices


Meet Your Icom Team
Taylor Stokes Service Technician Continued from page 1
The rugged Icom IC-F121 mobile performed well in all three areas, Steinberger says. It is a workhorse radio with good power and a very good selective receiver. Vigilance to details has earned PCI Race Radios a reputation for quality and service. Weve earned the respect of the off-road racing industry, Steinberger says.
Taylor Stokes is our newest Service Technician in the Service Department, repairing your land mobile radios and repeaters that come in for service. With a knack for detail and precision (his degree in Electronics doesnt hurt!), he is a radio testing ninja. By testing each radio that comes across his desk thoroughly, he ensures that everything is functioning properly and meets specifications. This can include upgrades, modifications and repair down to component level. When asked about goals for the position, he related that Properly restoring the radio or repeater so we can return them as quickly as possible back to the dealer is our top priority.
APCO International is Coming Up August 1-4, 2010 in Houston, TX.
The APCO International Annual Conference presents the public safety communications industrys best educational and product offerings.

Icom America Inc.

2380 116th Ave NE Bellevue, WA 98004 Phone: (425) 454-8155 Fax: (425) 454-1509 Customer Service: (425) 454-7619
Come see us at booth #567!

Icom America Systems

Phone: (425) 586-6363 Fax: (425) 586-6321

Page 2

Recent Changes to Our Website
Now it is easier than ever to contact Icom for service, tech support and parts with the Contact Icom easy button found on the new home page. It takes you directly to department descriptions with phone numbers and contact forms. You can also find out the latest news about Icom and our radios directly on the home page!



02.12.26 10:09 AM

Page a (1,1)



iF111 iF121


iF211 iF221

Page i (1,1)


READ ALL INSTRUCTIONS carefully and completely before using the transceiver.


RWARNING! NEVER connect the transceiver to an AC outlet. This may pose a re hazard or result in an electric shock. CAUTION! NEVER touch the transceiver (especially the heat sink) when transmitting continuously for long periods. It will become hot. NEVER connect the transceiver to a power source of more than 16 V DC such as a 24 V battery. This connection will ruin the transceiver. NEVER cut the DC power cable between the DC plug and fuse holder. If an incorrect connection is made after cutting, the transceiver might be damaged. NEVER place the transceiver where normal operation of
the vehicle may be hindered or where it could cause bodily injury.
SAVE THIS INSTRUCTION MANUAL This instruction manual contains important operating instructions for the IC-F111/F121 VHF TRANSCEIVER and IC-F211/F221 UHF TRANSCEIVER.


DEFINITION Personal injury, re hazard or electric shock RWARNING may occur. CAUTION NOTE Equipment damage may occur. If disregarded, inconvenience only. No risk of personal injury, re or electric shock. WORD
Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United states, the United Kingdom, Germany, France, Spain, Russia and/or other countries. SmarTrunk II is a trademark of the SmarTrunk Systems, Inc.
NEVER allow children to touch the transceiver. NEVER expose the transceiver to rain, snow or any liquids.

Page ii (1,1)

the supplied microphone only. Other microphones have different pin assignments and may damage the transceiver.
IMPORTANT... i EXPLICIT DEFINITIONS... i PRECAUTION.... i TABLE OF CONTENTS... ii 1 PANEL DESCRIPTION... 16 I Front panel... 1 I Function display... 2 I Programmable function keys.. OPERATION... 710 I Turning power ON... 7 I Channel selection... 7 I Receiving and transmitting.. 8 D Transmitting notes... 8 D TX code channel selection.. 9 D TX code number selection.. 9 D DTMF transmission... 9 D Scrambler function... 9 D User set mode... OPTIONAL SmarTrunk IITM OPERATION. 1112 I SmarTrunk IITM and conventional modes. 11 I SmarTrunk IITM operation.. CONNECTION AND MAINTENANCE.. 1317 I Rear panel and connection.. 13 I Supplied Accessories... 14 I Mounting the transceiver.. 15 I Optional UT-105, UT-108 or UT-111 installation. 15 I Optional UT-109 or UT-110 installation.. 16 I Optional OPC-617 installation.. 16 I Antenna... 17 I Fuse replacement... 17 I Cleaning... OPTIONS... SAFETY TRAINING INFORMATION.. 19
DO NOT use or place the transceiver in areas with temperatures below 22F (30C) or above +140F (+66C), or in areas subject to direct sunlight, such as the dashboard. AVOID operating the transceiver without running the vehicles engine. The vehicles battery will quickly run out if the transceiver transmits while the vehicles engine OFF. AVOID placing the transceiver in excessively dusty environments.

placing the transceiver against walls. This will obstruct heat dissipation.
AVOID the use of chemical agents such as benzine or alcohol when cleaning, as they damage the transceiver surfaces.
For U.S.A. only CAUTION: Changes or modifications to this transceiver, not expressly approved by Icom Inc., could void your authority to operate this transceiver under FCC regulations.

Page 1 (1,1)


I Front panel

r e UP/DOWN [ ]/[ ] KEYS Push to select the operating channel. Can be programmed for one of several functions by your dealer. (Same as [P0] to [P3] keys) r POWER SWITCH [POWER] Push to turn the power ON and OFF.
The following functions are available at power ON as options: - Automatic scan start - Password prompt - Set mode
q AF VOLUME CONTROL KNOB Rotate the knob to adjust the audio output level.
Minimum audio level is pre-programmed.
w FUNCTION DISPLAY Displays a variety of information, such as an operating channel number/name, 5-tone code, DTMF numbers and audible condition, etc. NOTE: The above functions depend on pre-programming.

Page 2 (1,1)

t DEALER-PROGRAMMABLE KEYS [P0] to [P3] Desired functions can be programmed independently by your dealer. y MICROPHONE CONNECTOR Connect the supplied microphone or optional DTMF microphone for SmarTrunk IITM operation here. NEVER connect non-specified microphones. The pin assignments may be different and the transceiver may be damaged. D MICROPHONE The supplied microphone has a PTT switch and a hanger hook.
The following functions are available when the microphone is on or off hook: - Automatic scan start when on hook. - Automatic priority channel selection when off hook. - Sets to Inaudible condition (mute condition) when on hook. - Sets to Audible condition (unmute condition) when off hook.

I Function display

q w e r t y u
q TRANSMIT INDICATOR Appears while transmitting. w BUSY INDICATOR Appears while the channel is busy. e SIGNAL STRENGTH METER Indicates relative receive signal strength level. r LOW POWER INDICATOR Appears when low output power is selected. t AUDIBLE INDICATOR Appears when the channel is in the Audible condition (unmute condition). y SCRAMBLER INDICATOR Appears when the scrambler function is activated. (Optional UT-109 (#02)/UT-110 (#02) SCRAMBLER UNIT is required.)

Page 3 (1,1)

u 2/5TONE INDICATOR Appears when the specied 2/5-tone call is received. i ALPHANUMERIC DISPLAY Displays the CH number, 5-tone indication, DTMF numbers, Audible indication, etc. NOTE: When the alphanumeric display blinks and transmitting becomes impossible, check that the DC battery voltage has not dropped below 8 V or that the antenna is not tuned properly or the antenna connection is faulty.
I Programmable function keys
The following functions can be assigned to [P0], [P1], [P2], [P3], [ ] and [ ] programmable function keys. Consult your Icom dealer for details concerning your transceivers programming. In the following explanations, programmable function names are bracketed. The specic switch used to activate the function depends on programming. CH UP AND DOWN KEYS Select an operating channel. CH UP Select a transmit code channel after pushing CH DN the [TX CH] key. Select a DTMF channel after pushing the [DTMF] key. Select a scan group after pushing and holding the [SCAN] key. BANK KEY Select and determine a bank number. BANK
When the optional UT-105 is installed, push one or more times to select a channel bank for conventional channels or SmarTrunk II TM channels.

Page 4 (1,1)

SCAN START/STOP KEY Push this key to start scanning; and push again SCAN A to stop.


MONITOR KEY Activates one of (or two of) the following functions MONI on each channel independently:
Push and hold the key to unmute the channel (audio is emitted; Audible condition). Push the key to toggle between the mute and unmute conditions (toggles between Audible and Inaudible). Push the key to mute the channel (sets to Inaudible only). Push the key to unmute the channel (sets to Audible only). Push the key after communication is nished to send a reset code.
NOTE: Place the microphone on hook to start scanning. Take the microphone off hook to stop scanning. SCAN TAG KEY Adds or deletes the selected channel to the scan TAG group. PRIORITY CHANNEL KEYS Push these keys to select priority A or priority B PRI A channel, respectively.
OPERATING CHANNEL KEYS Select an operating channel directly. CH1


NOTE: The unmute condition (Audible condition) may automatically return to the mute condition (Inaudible condition) after a specified period depending on the pre-setting. LOCK KEY Push this key for 1 sec. to lock all programmable LOCK keys except the following:
[CALL] (incl. [CAL A] and [CAL B]), [MONI] and [EMER] keys.

Page 5 (1,1)

CALL KEY Transmit a 2-tone, 5-tone code. CALL
Call transmission is necessary before you call another station depending on your signaling system. The [CAL A] and/or [CAL B] keys may be available when your system employs selective Individual/Group calls. Contact your dealer about which call is assigned to each key.

OUTPUT POWER SELECTION KEYS Select the transmit output power temporarily, or H/L permanently, depending on the pre-setting.
Contact your dealer for the output power level for each selection.


TALK AROUND KEY Turns the talk around function ON and OFF. TA
The talk around function equalizes the transmit frequency to the receive frequency for mobile-to-mobile communication.
EMERGENCY KEY Push and hold the key to transmit an emergency call. EMER
If you want to cancel the emergency call, push and hold (or push) the key again before transmitting the call. Depending on the pre-setting, the emergency call is transmitted one time only, or repeatedly, until receiving a control code.
WIDE/NARROW KEY Push this key to toggle the bandwidth between W/N wide or narrow. DTMF AUTODIAL KEY Push this key to display the text of the DTMF DTMF channel number and set the desired channel number via the [ ]/[ ] key. Then, push this key again to transmit a specied DTMF code.
HOOK SCAN When the Hook Scan function is turned ON, push HOOK this key to stop scanning temporarily. Push this key again to re-start scanning. TX CODE KEY Select a transmit 5-tone code (station code) chanTX CH nel.

Page 6 (1,1)

SCRAMBLER KEY Push and hold to turn the voice scrambler funcSCRM tion ON. Push this key to turn the voice scrambler function OFF. NOTE: The optional UT-109 (#02) or UT-110 (#02) VOICE SCRAMBLER UNIT is required.
UT-109: Non-rolling type. 32 codes are available. UT-110: Rolling type. Provides higher communication security. 1020 (4 groups 255) codes are available.
USER SET MODE KEY Changes the contents of the items in the User Set SET mode. Please refer to p. 10.
Push and hold this key for 1 sec. to enter set mode. Push this key again momentarily to select the desired item. Push [ ]/[ ] to set the desired level/condition. Push and hold this key again to exit set mode. User set mode also available via the Power ON function.
This transceiver requires version #02 of these units. Do not install version #01, as they are not compatible. Some PC board modifications are required when installing UT-109 or UT-110. Please refer to Optional UT-109 or UT-110 installation. (p.16) Please contact your dealer for details.

Page 7 (1,1)

q Push [


I Channel selection
Several types of channel selection are available. The methods may differ according to your system setup. NON-BANK TYPE: Push [ ]/[ ] to select the desired operating channel in sequence; or, push one of the [CH 1] to [CH 4] keys to select a channel directly. BANK-TYPE: Push [BANK] to select the desired bank number or name. AUTOMATIC SCAN TYPE: Channel setting is not necessary for this type. When turning the power ON, the transceiver automatically starts scanning. Scanning stops when receiving a call or when taking the microphone off hook.

I Turning power ON

] to turn the power ON. w If the transceiver is programmed for a start up passcode, input the digit codes as directed by your dealer.
The keys in the table below can be used for password input: The transceiver detects numbers in the same block as identical. Therefore 01234 and 56789 are same.


e When the PASSWORD indication does not clear after inputting 4 digits, the input code number is incorrect. In this case, turn the power off and start over.

Page 8 (1,1)

I Receiving and transmitting
RECEIVING: q Push [ ] to turn the power ON. w Push [ ] and [ ] to select a channel. e When receiving a call, adjust the audio output level to a comfortable listening level. TRANSMITTING: r Take the microphone off hook.
2-tone, 5-tone mute may be released. (The audible condition is selected and appears.) A priority channel may be selected automatically.

D Transmitting notes

Transmit inhibit function The transceiver has several inhibit functions which restrict transmission under the following conditions:
- The channel is in mute condition (Inaudible condition; not appear). - Channel is busy. - A matched/un-matched CTCSS code is received. - The selected channel is a receive only channel. does
t Wait for the channel to become clear.
The channel is busy when appears.
y Push the [CALL] key when initiating a call from your side.
Coded audio may be heard from the transceiver, then appears. This operation may not be necessary depending on your signaling system. Contact your dealer.
Time-out timer After continuous transmission for a pre-programmed period, the time-out timer is activated causing the transceiver to stop transmitting and automatically select receive. Penalty timer Once the time-out timer is activated, transmission is further inhibited for a period determined by the penalty timer.
u While pushing and holding [PTT], speak into the microphone at your normal voice level. i Release [PTT] to receive. IMPORTANT!: To maximize the readability of your signal; Pause briey after pushing [PTT]. Hold the microphone 2 to 5 cm from your mouth, then speak into the microphone at a normal voice level.

Page 9 (1,1)

OPERATION D DTMF transmission
If the transceiver has a [DTMF] key, the automatic DTMF transmission function is available. Up to 7 DTMF channels may be available. To transmit a DTMF code: q Push [DTMF]a DTMF code channel appears. w Push [ ]/[ ] to select the desired DTMF channel. e Push and hold [DTMF] to transmit the DTMF code on the selected DTMF channel.
D TX code channel selection
If the transceiver has a [TX CH] key, the display can be toggled between the operating channel number (or name) and TX code channel number (or name). When the TX code channel number (or name) is displayed, the [ ]/[ ] keys select the TX code channel. To select a TX channel: q Push [TX CH]a TX code channel appears. w Push [ ]/[ ] to select the desired TX code channel. e Push [CALL] to transmit the selected TX code. r Push [TX CH] again to return to the channel display.

D Scrambler function

The UT-109 (#02) or UT-110 (#02) optional voice scrambler unit provides high performance private communication between stations with the same scrambler codes. To turn the scrambler function ON and OFF: q Push and hold [SCRM] to turn the scrambler function ON. w Push [SCRM] to turn the function OFF.
D TX code number selection
If the transceiver has a [TX CH] key, TX code contents can be changed within the allowable digits. To select a TX code: q Push [TX CH]a TX code number appears and the rst digit blinks. w Push [ ]/[ ] to select the desired number of the blinking digit. e Push [TX CH] to enter the selected number and the next digit will start blinking automatically. r Repeat step w and e to input all allowed digits. t Push [CALL] to transmit the selected TX code. 9

Page 10 (1,1)

OPERATION D User set mode
User set mode is accessed at power ON and allows you to set seldom-changed settings. In this case you can customize transceiver operation to suit your preferences and operating style. Entering the user set mode: q While pushing and holding [ ] and [ ], push [POWER] to enter user set mode ON, allowing you to set seldomchanged settings. w Push and hold [P0] to select the appropriate item. Then, push [ ] or [ ] to set the desired level/mode. - Available set mode functions; Backlight : OFF, Dim, Auto or ON Beep : OFF or ON SQL Level : 0 to 255 AF Min level : 0 to 255 e Push [POWER] (or push and hold [P0]) again to exit set mode. User set mode is also available via a programmable key. Please refer to p. 6 [SET] section.

Page 11 (1,1)


I SmarTrunk II operation

These features are enabled by a dealer and may not be available in your system. Contact your dealer for details.
I SmarTrunk II and conventional modes
This transceiver is capable of SmarTrunk II functions. The optional UT-105 allows communication in conventional channels or SmarTrunk II channels. Select a channel bank for SmarTrunk II before trunking operation. Push [BANK] several times to select a channel bank for conventional channels or SmarTrunk II channels.
- Scanning starts when a channel bank for SmarTrunk II operation is selected. - Contact your dealer for channel bank details.
D Placing a telephone call
Enter the phone number followed by [1], [M].
A high-pitched beep indicates that the number is accepted. When the called party answers, push the [PTT] switch to talk, and release it to listen.
D Calling another local system subscriber
Enter the subscriber number followed by [3], [M].
A high-pitched beep indicates that the number is accepted. You hear ringing, then two short beeps when the subscriber answers. If the other subscriber is on another call or out of range, you hear a fast busy signal and the call terminates automatically.

NOTE: Optional HM-100TN DTMF MICROPHONE is required. Contact your dealer for details.

D Receiving a call

When you hear ringing, push [M] to answer.
For a group call, you hear a short ring followed by two short beeps. You do not have to answer a group call to hear it over the air.

Page 12 (1,1)

OPTIONAL SmarTrunk II OPERATION D Terminating a call
After completing a call, push [#] to disconnect (hang up). IMPORTANT!: If one person in the conversation terminates a call, all participants will be cut off.

D System busy indication

If all channels are busy, three low beeps sound after you initiate a call. Try the call again later.

D PTT dispatch operation

q Push [PTT] once (without dialling) to initiate a dispatch call. w Begin talking after you hear three beeps (one short, highpitched, two very-short, low-pitched). e Receiving a dispatch call is indicated by the same threebeep sequence.
It is not necessary to push [M] to answer a dispatch call.

D Last number re-dial

Push [M] 2 times to automatically re-dial the last called number.
A high-pitched beep indicates that the number is accepted.

D Memory speed-dialling

To automatically dial a commonly used number from memory: Push [M] followed by the memory location (09).

D Emergency call

Push [0], [M] to initiate an emergency call.
Contact your dealer for details.

D Turbo SpeeDial

To automatically dial a commonly used number with one push: Push one of the turbo SpeeDial keys ([A], [B], [C] or [D]).

D Clear channel alerting

If all channels are busy, the transceiver automatically begins searching for an open channel and beeps every ten seconds. When two short beeps (low-pitched, then high-pitched) are heard, a channel is available. Push [M] two times immediately to re-dial the last number. NOTE: For additional operating instructions, contact your dealer.
D Programming memory speed dial
q Push and hold [M] until you hear a high-pitched beep. w Enter the memory location (09, A, B, C, D), the telephone or subscriber number, then [1], [M] (or [3], [M] if for another system subscriber).
A high-pitched beep indicates successful programming. Memories [A][D] are used for the Turbo SpeeDial.

Page 13 (1,1)

I Rear panel and connection
Antenna Optional speaker (SP-22)
R C A U T I O N ! N E V E R r emove the fuse-holder from the DC power cable. black: q 12V Battery NEVER connect to a 24 V battery. NOTE: Use the terminals as shown below for the cable connections. e r Crimp Solder red:
To the antenna connector t Optional cable (OPC-617)

Page 14 (1,1)

q ANTENNA CONNECTOR Connects to an antenna. Contact your dealer about antenna selection and placement. w MICROPHONE HANGER Connect the supplied microphone hanger to the vehicles ground for microphone on/off hook functions. (See p. 2) e DC POWER RECEPTACLE Connects to a 12 V DC battery. Pay attention to polarities. NEVER connect to a 24 V battery. This could damage the transceiver. r OPTIONAL CABLE (OPC-617) Connect an external modem unit, dimmer control, etc. t EXTERNAL SPEAKER JACK Connect a 48 external speaker, if desired.

I Supplied Accessories

q w e r


u i o !1 !2
q Microphone.. 1 w Microphone hanger and screw set. 1 set e Microphone hanger cable. 1 r DC power cable (OPC-1132)..1 t Function name stickers* (KEY STICKER)..1
y Mounting bracket. 1 u Bracket bolts. 4 i Mounting screws (M512). 4 o Self-tapping screws (M520).. 4 !0 Flat washers.. 4 !1 Spring washers.. 4 !2 Nuts.. 4
*Function name stickers There are no names on the programmable function keys since the functions can be freely assigned to these keys. Attach the supplied function name stickers above the appropriate keys for easy recognition of that keys assigned function.

Page 15 (1,1)

I Mounting the transceiver
The universal mounting bracket supplied with your transceiver allows overhead mounting. Mount the transceiver securely with the 4 supplied screws to a thick surface which can support more than 1.5 kg.
I Optional UT-105, UT-108 or UT-111 installation
Install the optional UT-105, UT-108 or UT-111 unit as follows: q Turn the power OFF, then disconnect the DC power cable. w Unscrew the 4 cover screws, then remove the bottom cover. e Install the unit as shown in the diagram below. r Replace the bottom cover and screws, then re-connect the DC power cable.
UT-105/ UT-108/ UT-111 Front panel

Flat washer

Spring washer
When using self-tapping screws

Page 16 (1,1)

I Optional UT-109 or UT-110 installation
q Turn the power OFF, then disconnect the DC power cable. w Unscrew the 4 cover screws, then remove the bottom cover. e Cut the pattern on the PCB at the TX mic circuit (MIC) and RX AF circuit (DISC) as shown below. r Install the scrambler unit as described in the installation of optional UT-105, UT-108 or UT-111 as on the page at left. t Replace the bottom cover and screws.

Front panel

I Optional OPC-617 installation
Install the OPC-617 as shown below.
OPC-617 Cut off the bushing as in the illustration, when you install the optional OPC-617.

trewq q Dimmer cont. IN or IGSW cont. IN w AF OUT e Det. AF OUT r Mod. IN t PTT control IN or FTSW control IN y Horn drive cont. OUT u AF GND i Det. AF GND o Mod. GND
NOTE: Be sure to re-solder the above disconnected points when you remove the scrambler units. Otherwise no TX modulation or AF output is available.

Page 17 (1,1)

I Antenna
A key element in the performance of any communication system is an antenna. Contact your dealer about antennas and the best places to mount them.

I Fuse replacement

A fuse is installed in the supplied DC power cable. If a fuse blows or the transceiver stops functioning, track down the source of the problem if possible, and replace the damaged fuse with a new rated one.

Fuse rating: 20 A

I Cleaning
If the transceiver becomes dusty or dirty, wipe it clean with a soft, dry cloth. AVOID the use of solvents such as benzene or alcohol, as they may damage the transceiver surfaces. 17

Page 18 (1,1)

SP-22 EXTERNAL SPEAKER Compact and easy-to-install. Input impedance : 4 Max. input power : 5 W HM-100TN DTMF microphone. SM-25 Desktop microphone. UT-105 SmarTrunk IITM Logic Board Provides SmarTrunk IITM capabilities. UT-108 DTMF DECODER UNIT Provides pager and code squelch capabilities. UT-109/UT-110 (#02) VOICE SCRAMBLER UNIT UT-109 : Non-rolling type (max. 32 codes) UT-110 : Rolling type (max. 1020 codes) UT-111 TRUNKING BOARD Provides trunking operation. OPC-617 ACC CABLE Allows you to connect to an external terminal.

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To ensure that your exposure to RF electromagnetic energy is within the FCC allowable limits for occupational use, always adhere to the following guidelines:
Your Icom radio generates RF electromagnetic energy during transmit mode. This radio is designed for and classified as Occupational Use Only, meaning it must be used only during the course of employW ARN ING ment by individuals aware of the hazards, and the ways to minimize such hazards. This radio is NOT intended for use by the General Population in an uncontrolled environment. For compliance with FCC and Industry Canada RF Exposure Requirements, the transmitter antenna installation shall comply with the following two conditions: 1. The transmitter antenna gain shall not exceed 0 dBi. 2. IC-F121: The transmitter antenna is required to be located outside of a vehicle and kept at a separation distance of 65 centimeters or more between the transmitter antenna of this device and persons during operation. 3. IC-F221: The transmitter antenna is required to be located outside of a vehicle and kept at a separation distance of 52 centimeters or more between the transmitter antenna of this device and persons during operation.


DO NOT operate the radio without a proper antenna attached, as this may damage the radio and may also cause you to exceed FCC RF exposure limits. A proper antenna is the antenna supplied with this radio by the manufacturer or an antenna specically authorized by the manufacturer for use with this radio. DO NOT transmit for more than 50% of total radio use time (50% duty cycle). Transmitting more than 50% of the time can cause FCC RF exposure compliance requirements to be exceeded. The radio is transmitting when the TX indicator lights red. You can cause the radio to transmit by pressing the PTT switch.
Electromagnetic Interference/Compatibility
During transmissions, your Icom radio generates RF energy that can possibly cause interference with other devices or systems. To avoid such interference, turn off the radio in areas where signs are posted to do so. DO NOT operate the transmitter in areas that are sensitive to electromagnetic radiation such as hospitals, aircraft, and blasting sites.

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Page Z (1,1)

Count on us!

A-6235H-1EX Printed in Japan 2002 Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan


Technical specifications

Full description

The Icom IC-F121S-51 Mobile Transceiver is designed for use by small to large business, and small to mid-size police and emergency services. The IC-F121S is a mobile VHF 136-174 MHz radio with 50 watts of power. It is easy to operate and has a rugged and compact design. The F121S is perfect for those that want a basic, reliable mobile radio. The IC-F121S has 8 channels, a 4 watt front mount speaker, and large knobs and buttons. The F121S has built-in 2-Tone, 5-Tone, CTCSS and DTCS capabilities and up to ten 2-tone and eight 5-tone codes can be decoded on a channel. The radio case is heavy duty and is rated to 810 MIL standards. The IC-121S comes with an HM-152 handheld microphone, mic hanger kit, power cable, mounting kit and hardware, key assign stickers, and user manual. Note: Requires the use of an additional antenna (not included).



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