Intek MX-825V, MX-825U Instruction Manual
136-174 MHz VHF FM / 199CH / 10W-25W
PROFESSIONAL MOBILE RADIO
PC PROGRAMMABLE
MX-825V
400-470 MHz UHF FM / 199CH / 10W-25W
PROFESSIONAL MOBILE RADIO
PC PROGRAMMABLE
MX-825U
INSTRUCTION MANUAL
MANUALE DI ISTRUZIONI
Index - Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General information - User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Unpacking and checking parts - Supplied accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Getting acquainted with the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Menu Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
Advanced Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17
Auxiliary Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
Specifications - Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Declaration of Conformity MX-825V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Declaration of Conformity MX-825U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Frequency / Channels Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Index - Notice
- 1 -
NOTICE !
This transceiver is programmable via PC, using the dedicated software (free download at
www.intek-radios.com) and the PC interface cable (optional item). Any programming or
modification of the original default setting must be made by a specialised technician or by an
authorised service centre. Some functions of this transceiver might be programmed in violation of
the technical rules in force for the use of the VHF and UHF FM bands. It is the user’s
responsibility to check that any modification to the programming will be done in compliance with
the current regulations. Any modification to the product, alteration of the internal circuit, of the
external structure of the radio or any programming in violation of the current regulations will
automatically void the product certification and your right to use the product. INTEK S.R.L.
declines any responsibility concerning any modification of the product, made by the user or by a
third party, after delivery of the product.
NOTICE !
This transceiver has been factory pre-programmed, in order for the user to test it right after
purchase. It is the user' s responsibility to re-program the radio, in accordance with the
specifications for the frequency channels assigned by the local authority.
NOTICE !
It is recommended to carefully read this owner’s manual before using the product. This will also
help the user to prevent using the radio in violation of the regulations valid in the country where
the product is used, as well as to avoid any possible interferences with other services.
English
Thank you !
Thank you for choosing INTEK for your two-way business radios applications. This user friendly
transceiver will provide you with clear and reliable communications and will keep your professional
activities at peak efficiency. This transceiver incorporates the latest and most advanced technology, so
you will be pleased with its quality and its technical features.
Important notice !
The use of VHF and UHF FM transceivers is subject to the regulations applied in the country where the
product has to be used. As regulations are usually subject to possible modifications, please check the
current regulations in your country with your dealer or local supplier. INTEK does not take any
responsibility for illegal use and operation of this product not in accordance with the regulation of the
country where the product is used.
Safety notice
The user must know and understand the common risks related to the use of transceivers. Do not use
the transceiver in environments at risk of explosion (where there are gas, dusts, smokes, etc.). Do not
use the transceiver in service areas or fuel stations, on board aircrafts, etc.
Radio waves occurred by transmitting will interfere kinds of electronic equipment inside car (E.g. Antiskid braking systems, electronic ignition systems, electronic fuel injectors). Asking your dealer for help
to protect these equipments from interfering while transmitting, if your car is with these equipments.
Cautions
Please observe the following precautions, in order to avoid causing fire, personal injuries or damage to
the radio:
• Do not touch your transceiver metal surface while operating.
• Do not install the transceiver in the place which the body skin can close to the transceiver base.
• High temperature may make skin burns
- 2 -
General Information
English
General Informations - User Information
- 3 -
GENERAL INFORMATIONS
• Do not attempt to operate your vehicle transceiver while driving. To avoid the high risk.
• Do not operate your transceiver while someone touching antenna or standing within 2-3 feet away
from antenna; it could protect you from burn or others hurt.
• Do not operate your transceiver within blast area or nearby blast primer
• Please turn OFF your transceiver when refueling or stopping at the gas station
• Do not modify your transceiver at any case.
• Do not expose the transceiver to direct sunlight of long periods, nor place it close to heating
appliances.
• Do not place the transceiver in excessively dusty, humid or wet areas, or on unstable surfaces.
• Do not attempt to dismantle your transceiver unless professional technical personnel.
• Please use the antenna and power cable with fuse specified by manufacturer or suppliers.
English
User Information
in accordance with art. 13 of the Legislative Decree of 25th July 2005, no. 15 ”Implementation of Directives 2002/95/EC,
2002/96/EC and 2003/108/EC, relative to reduction of the use of hazardous substances in electrical and electronic
equipment, in addition to waste disposal”.
The crossed bin symbol shown on the equipment indicates that at the end of its working life the product must
be collected separately from other waste.
The user must therefore take the above equipment to the appropriate differentiated collection centres for
electronic and electro technical waste, or return it to the dealer when purchasing a new appliance of
equivalent type, in a ratio of one to one.
Appropriate differentiated waste collection for subsequent recycling, treatment and environment-friendly disposal of the
discarded equipment helps to prevent possible negative environmental and health effects and encourages recycling of
the component materials of the equipment.
Illegal disposal of the product by the user will be punished by application of the administrative fines provided for by the
legislative decree no. 22/1997 (article 50 and following of the legislative decree no. 22/1997).
Unpacking and Checking Parts - Supplied Accessories
- 4 -
Unpacking and checking parts
Carefully unpack the product. Please identify all the parts listed below, before wasting the packaging. If
any part is missing or if the packaging shows any damage, please contact your dealer immediately.
Supplied accessories
Microphone
Microphone Hanger
Fixed Bracket
Power Cable
Screws
Protective Tube
User Manual
English
Protective FuseMicrophone Hanger Screws
Power Cable Microphone Fixed Bracket
INSTALLATION
Transceiver Installation
To install the transceiver, select a safe, convenient location inside your vehicle that minimizes danger to
your passengers and yourself while the vehicle is in motion. Consider installing the unit at an
appropriate position so that knees or legs will not strike it during sudden braking of your vehicle. Try to
pick a well ventilated location that is shielded from direct sunlight.
1. Install the mounting bracket in the vehicle using the supplied self-tapping screws, flat washers,
and spring washers.
2. Position the transceiver, then insert and tighten the supplied hexagon SEMS screws and flat
washers.
• Double check that all hardware is tightened to prevent vehicle vibration from loosening the
bracket or transceiver.
• Determine the appropriate angle of the transceiver, using the 3 screw hole positions on the
side of the mounting bracket.
DC Power Cable Connection
The vehicle battery must have a nominal rating of 12V. Never connect the transceiver to a 24V battery.
Be sure to use a 12V vehicle battery that has sufficient current capacity. If the current to the transceiver
is insufficient, the display may darken during transmission, or transmit output power may drop
excessively. This unit can only work under power system which is 13.8 ± 15%V negative ground.
1. Route the DC power cable supplied with the transceiver directly to the vehicle’s battery terminals
using the shortest path from the transceiver.
• If using a noise filter, it should be installed with an insulator to prevent it from touching metal on
the vehicle.
• We recommend you do not use the cigarette lighter socket as some cigarette lighter sockets
introduce an unacceptable voltage drop.
• The entire length of the cable must be dressed so it is isolated from heat, moisture, and the
engine secondary (high voltage) ignition system / cables.
2. After the cable is in place, wrap heat-resistant tape around the fuse holder to protect it from
moisture and tie down the full run of cable.
Installation
- 5 -
English
Self-tapping Screw
SpringWasher
Flat Washer
SEMS Screw
- 6 -
Installation
3. To prevent the risk of short circuits, disconnect other wiring form the negative (-) battery terminal
before connecting the transceiver.
4. Confirm the correct polarity of the connections, then attach the power cable to the battery
terminals; red connects to the positive (+) terminal and black connects to the negative (-) terminal.
• Use the full length of the cable without cutting off excess even if the cable is longer than
required. In particular never remove the fuse holders from the cable.
5. Reconnect any wiring removed from the negative terminal.
6. Connect the DC power cable to the transceiver’s power supply connector.
• Press the connectors firmly together until the locking tab clicks.
Replacing Fuses
If the fuse blows, determine the cause, then correct the problem. After the problem is resolved, replace
the fuse. If newly installed fuses continue to blow, disconnect the power cable and contact your
authorized dealer or an authorized service center for assistance.
CAUTION
Only use fuses of the specified type and rating; otherwise the transceiver could be damaged.
Antenna Connection
Before operation, install an efficient, well-tuned antenna. The success of your installation will depend
largely on the type of antenna and its correct installation. The transceiver can give excellent results if
the antenna system and its installation are given careful attention.
Use a 50 Ohm impedance antenna and low-loss coaxial feed line that has a characteristic impedance
of 50 Ohm, to match the transceiver input impedance.
Coupling the antenna to the transceiver via feed lines having an impedance other than 50 Ohm reduces
the efficiency of the antenna system and can cause interference to nearby broadcast television
receivers, radio receivers, and other electronic equipment.
CAUTION
• Transmitting without first connecting an antenna or other matched load may damage the
transceiver. Always connect the antenna to the transceiver before transmitting.
• All fixed stations should be equipped with a lightning arrester to reduce the risk of fire, electric
shock, and transceiver damage.
English
Getting Acquainted with the Product
- 7 -
Front Panel
1. Down Key
This key allows adjust the volume level downward. By keeping this key pressed, the quick volume level selection
mode will be enabled.
2. Up Key
This key allows to select the operating channel upward. By keeping this key pressed, the quick volume level
selection mode will be enabled.
3. LCD Display
Backlighted Dot Matrix LCD Display, provides clear reading and full information on every function
and status of the radio
4. Menu/Confirmation Key / Rotary Switch
In Stand-by Mode use this knob to select the desired Channel/Zone.
Press this knob to enter the MENU Mode and to confirm the menu selections. In MENU Mode,
tune this knob to select the several MENU functions and options.
Press and hold this knob to start the scanning functions.
5. Speaker
Built-in speaker.
6. EXIT
Press this key to exit the MENU Mode and return to Stand-By status.
7. DTMF Key
Press this key to enter DTMF Mode. Use Rotary Switch (4) to select the desired DTMF group.
1 2
12 11 10 9 8 7 6
3 4 5
English
- 8 -
Getting Acquainted with the Product
8. 5 TONE Key
Press this key to enter 5-Tone Mode. Use Rotary Switch (4) to select the desired 5-Tone group.
9. 2 TONE Key
Press this key to enter 2-Tone Mode. Use Rotary Switch (4) to select the desired 2-Tone group.
10. MONITOR Key
Press this key to open the Squelch, in order to hear the background noise and release it to close
the Squelch.
11. Power ON/OFF Key
Press this key to switch ON the radio. Press and hold this key to switch OFF the radio.
12. Microphone Connector
Connect the microphone to this connector.
Rear Panel
13. ANTENNA Connector (SO-239)
Antenna connector. Refer to the section "ANTENNA CONNECTION" at page 6.
14. 13.2VDC POWER CORD
13.2VDC power cord input. The power cord is complete with fuse.
15. EXT (External Speaker) Jack
This jack is for connecting an external speaker (optional).
13 14 15
English
- 9 -
Getting Acquainted with the Product
A. Signal Digital Bar Meter
Indicates the received signal strenght in the receive mode.
B. CT Icon
The CT Icon (B) is lighted when the CTCSS function is enabled. Please refer to CTCSS/DCS
function at page 15.
C. DCS Icon
The DCS Icon (C) is lighted when the DCS function is enabled. Please refer to CTCSS/DCS
function at page 15.
16. PTT (Push-to-Talk) Key
Transmitter key. Press the PTT key (16) to
transmit and release it to return to the receive
mode.
English
A B DC E
R P O NQ
F G H
I
L
M
T
U
S
16
LCD Display
Microphone
- 10 -
Getting Acquainted with the Product
D.
+ -
Icons
Not available on this model.
E. R Icon
This icon is lighted when the Reverse Frequency function is enabled. Please refer to REVERSE
FREQUENCY FUNCTION at page 13.
F. PRI Icon
This icon is lighted when the Priority Scan function is enabled. Please refer to PRIORITY SCAN
FUNCTION at page 14.
G. WX Icon
Not available on this model
H. Narrow Bandwidth Icon
This icon shows the 12.5 KHz bandwidth.
I. Numerical Indication
This indication shows the last two digits of the frequency channel (P). When the Dot Matrix Indication
(P) shows the channel number, this Numerical Indication (I) shows the Zone Number.
When the Dot Matrix Indication (P) shows the Zone Number or Channel Name, this Numerical
Indication (I) shows the Channel Number.
L. Channel Scanning Icon
This Icon is lighed when the selected channel is programmed to the scanning list.
M. Keypad Lock Icon
The Lock icon (M) is lighted when the keypad lock function has been enabled.
N. Auto Resume Icon
This Icon is lighed when the Tone Decode Auto Resume function is enabled.
O. RF Digital Meter
It indicates the transmitter RF output power.
P. Dot Matrix Indication
It provides full information on channel and all enabled functions.
Q. BUSY Icon
This Icon is lighed when the selected channel is busy.
R. F Icon
Not available on this model.
S. L Icon
The L icon (S) is lighted when the transmitter is in Low Power mode.
T. M Icon
The M icon (T) is lighted when the transmitter is in Middle Power mode.
U. H Icon
The H icon (U) is lighted when the transmitter is in High Power mode.
- 11 -
Getting Started - Menu Operation
GETTING STARTED
Power ON
Switch on the transceiver by pressing the ON/OFF Key (11); the Welcome indication (P) appears on
the LCD display (3) and radio now is in Stand-by Mode.
Press and hold the ON/OFF Key (11) to switch OFF the radio.
Volume adjustment
Press or hold the DOWN key (1) to decrease the volume level and press or hold the UP key (2) to
increase the volume level. Press the MONITOR key (10) to listen to the background noise of the
channels while adjusting the volume to a comfortable level.
Transmission
In order to transmit, press the PTT key (16) and speak with your normal voice, keeping the microphone
(16) at about 4 cm from your mouth. The RF Digital Meter (O) will show the transmitter RF output
power. Release the PTT Key (16) at the end of transmission.
Note : If you continuously transmit for longer than the time specified in internal TOT, the transceiver will
generates a warning beep and stops transmitting. In this case, release PTT key (16) and let the
transceiver cool down for a moment, then press PTT key (16) again to resume transmission.
Receiving
Release the PTT key (16) and properly adjusting volume, you will be able to receive the incoming signals.
When receiving a signal, the BUSY Icon (Q) appears on LCD Display (3). For operating the
CTCSS/DCS, DTMF, 2-Tone or 5-Tone functions, refer to special sections.
Channel selection
Select the desired channel, using the Rotary Switch (4). In NAME Mode the LCD display (3) will show
the Channel Name. 199 channels are available.
Channel Mode / Name Mode
Press MENU Key (4) to enter the MENU Mode and select the MODE function. Use the Rotary Switch
(4) to select CH NO. (Channel Mode) or CH NAME (Name Mode). Press MENU key (4) to confirm
selection and return to Stand-by mode.
MENU OPERATION
Many functions on this radio, may be enabled or configured only by using the PC programming
software.
To access the MENU Mode and operating the menu options, please proceed as follow :
1. Press MENU Key (4) to enter the MENU Mode; the MODE indication (P) will appear on LCD display (3).
2. Use the Rotary Switch (4) to select the desired menu function.
3. Confirm the selected function by pressing the MENU Key (4).
4. Use the Rotary Switch (4) to select the desired function setup/option.
5. Press the MENU Key (4) to confirm the selected setup/option or press the EXIT Key (6) to return
to menu function selection.
6. Press any key, except MENU key (4), Power ON/OFF key (11) and Volume keys (1/2) to exit the
MENU mode and return to Stand-by mode.
Menu Operation - Advanced Functions
- 12 -
Menu function sequence
MODE (Operating modes) ---> TX.POW (transmitter power High-Middle-Low) --> SQH.LEV (Squelch
Level) --> SQH.MOD (Squelch modes) --> ZONE (Zone selection) --> MONI (Monitor modes) --> TOT
(Time Out Timer) --> SCN.MO (Scan modes) --> SCN.TY (Scan Type) --> REVERSE (Reverse
Frequency) --> BRIGHT (LCD DIsplay Brightness) --> K.TONE (Keypad Tone ON/OFF) --> S.TONE
(Side Tone ON/OFF) --> BEEP (Beep Tone ON/OFF) --> SCN.ADD (channel scanning add or remove) -
-> CTC/DCS (CTCSS/DCS Setup) --> COMPAND (Compander ON/OFF) --> EMPH (Emphasis
ON/OFF) --> CH.DEL (Channel Deletion Setup) -->TEMP (Temperature Adjusting ON/OFF)
ADVANCED FUNCTIONS
Zone Mode / Zone Selection
Zone Mode
Press MENU Key (4) to enter the MENU Mode and select the MODE function. Use the Rotary Switch
(4) to select ZO NO. (Zone Number) or ZO NAME (Zone Name) modes. Press MENU key (4) to confirm
selection and return to Stand-by mode.
Zone Selection
Press MENU Key (4) to enter the MENU Mode. Use the Rotary Switch (4) to select ZONE function and
press MENU Key (4) to confirm the selection. Use the Rotary Switch (4) to select the desired Zone
Number and confirm by pressing the MENU Key (4). Press EXIT Key (6) to return to Stand-by mode.
In CHANNEL MODE or NAME MODE, the numerical indication (I) will indicate the selected zone
number. 32 zones are available.
Channel Deletion
Select the channel to remove and enter the MENU Mode. Enter the CH.DEL function setup and select
CANCEL (cancel the operation) or SURE (confirm and delete the selected channel). When user selects
SURE option, the SURE! indication appears on LCD display and the channel will be deleted then radio
returns to Stand-by mode.
Monitor Function
This function opens Squelch in order to listen to the background noise and weak signals. The Monitor
function has 4 available options. In MENU mode enter the MONI function setup and use Rotary Switch
(4) to select the desired option as follow :
MONI A (Tone Squelch Invalidation-Instantaneous)
If this option is selected, press and hold MONI key (10) to open squelch on channels with CTCSS/DCS,
DTMF, 2/5-Tone and release this key to close squelch.
MONI B (Tone Squelch Invalidation-Trigger)
If this option is selected, press MONI key (10) to open squelch on channels with CTCSS/DCS, DTMF, 2/5Tone and press again this key to close squelch.
MONI C (Carrier Squelch Invalidation-Instantaneous)
If this option is selected, press and hold MONI key (10) to open squelch and release this key to close
squelch.
MONI D (Carrier Squelch-Trigger)
If this option is selected, press MONI key (10) to open squelch and rand press again this key to close
squelch.
Press MENU Key (4) to confirm the desired option and press EXIT key to return to Stand-by mode.
Keypad Lock
Press the Power ON/OFF Key (11) then the EXIT Key (6) to lock the keypad; the Keylock Icon (M) will
appear on LCD Display (3). Repeat the same procedure to unlock the keypad; he Keylock Icon (M) will
disappear on LCD Display (3).
Transmitter Output Power Setup
In MENU mode enter the TX.POW function setup and use Rotary Switch (4) to select the desired
transmitter output RF power as LOW (Low Power), MID (Middle Power) or HIGH (High Power). Press
MENU Key (4) to confirm the selection and press the EXIT Key (6) to return to Stand-By Mode or use
Rotary Switch (4) to select other functions.
The selected transmitter output power is indicated on LCD display (3); L (S) for Low Power, M (T) for
Middle Power and H (U) for High Power.
Note : On any channel it is possible select different RF power level, by using the PC software.
Reverse Frequency Function
When dual frequency is used to start reverse frequency function, the receiving frequency and emission
frequency will interchange on selected channel (it is possible only by using the PC software). In MENU
Mode, enter the REVERSE function setup and use Rotary Switch (4) to select ON (function enabled) or
OFF (function disabled). When the REVERSE function is enabled, the R Icon (E) appears on LCD
Display (3).
Scan Function
Scan Type
In MENU mode enter the SCN.TY function setup and use Rotary Switch (4) to select SCN.ZO or
SCN.CH options.
SCN.ZO : radio will scan all channels in the selected zone.
SCN.CH: radio will scan all channels in all zones.
Press MENU Key (4) to confirm the desired option and press the EXIT Key (6) to return to Stand-By
Mode or use Rotary Switch (4) to select other functions.
Start Scanning
Press and hold the MENU Key (4) to start scanning function; the SCAN indication (P) will appear on
LCD Display (3).
Note : This function can operate only if scanning list contains two or more channels. Please refer to
Channel Scanning Addition / Deletion function at page 14.
Stop Scanning
Scanning function will be stopped or paused in the following conditions :
1. By pressing the MENU Key (4); the SCAN indication (P) will disappear from LCD Display (3).
2. By pressing the MONI key (10); radio will resume scanning function after 3 seconds, if MONITOR
Key (10) is released.
3. A channel without an associated CTCSS/DCS tone receives the carrier wave.
4. A channel with an associated CTCSS/DCS tone receives the carrier wave and the same tone.
Scan Mode
In MENU mode enter the SCN.MO function setup and use Rotary Switch (4) to select TIMER or
CARRIER options.
Advanced Functions
- 13 -
Advanced Functions
- 14 -
TIMER SCAN : If this option is selected, SCAN will automatically stop when a signal is detected on one
channel, and re-start automatically after a programmed time.
CARRIER SCAN : If this option is selected, SCAN will automatically stop when a signal is detected on
one channel, in order to listen to the communication and SCAN will re-start when no more signal is
detected on that channel.
Note : The TIMER SCAN TIME is programmable with the PC software.
Press MENU Key (4) to confirm the desired option and press the EXIT Key (6) to return to Stand-By
Mode or use Rotary Switch (4) to select other functions.
Channel Scanning Addition / Deletion
Select the channel to be added to the scanning list. Enter the MENU Mode, select the SCN.ADD
function setup and press MENU Key (4) to confirm. Use the Rotary Switch (4) to select the following
options :
ADD : the selected channel will be added to the scanning list; the Channel Scanning Icon (L) will appear on
the LCD display (3).
DEL : the selected channel will be removed from the scanning list; the Channel Scanning Icon (L) will
disappear from the LCD display (3).
Press MENU Key (4) to confirm the desired option and press the EXIT Key (6) to return to Stand-By
Mode or use Rotary Switch (4) to select other functions.
Priority Scan Function
If a Priority Channel has been programmed, during scan function, radio will check periodically this
channel for incoming signals. When a signal is received on this channel, radio will switch automatically to
priority channel and the PRI Icon (F) will appear on LCD Display (3).
Note : This function is totally programmed by PC software and it is available only in CHANNEL MODE.
Priority Channel Cancel Temporarily
When the Scan function stops on Priority Channel, press EXIT key (6) to temporarily remove the priority
channel.
Note : When user exit the Scan function, the removed Priority Channel will be resumed.
Channel Scanning Cancel Temporarily
User can temporalily remove a channel from scanning list. When Scan Function stops on an unwanted
channel, press EXIT Key (6) to temporarily delete this channel from the scanning list.
The Scan function will resume immediately.
Note : When user exit the Scan function, Channel removed from scanning list will be resumed.
Reply Channel
During Scanning process, press PTT key (16) to stop the scan and switch to reply channel.
Note : This function may be enabled by using the PC software.
Scan Trasmitting / Receiving Resume Delay
When Scan stops on one channel, it will re-start only when the delay time is expired, even if incoming
signals disappear.
Note : The Delay Time may be programmed by using the PC software.
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