Intek M-790 plus User manual

OWNER'S MANUAL
MANUALE DI ISTRUZIONI
MULTI STANDARD PROGRAMMABLE
27 MHz CB MOBILE TRANSCEIVER
M-790 PLUS
Downloaded from www.cbradio.nl

Declaration of Conformity
With the present declaration, we certify that the following products :
INTEK M-790 PLUS
comply with all the technical regulations applicable to the above mentioned products
in accordance with the EC Directives 73/23/EEC, 89/336/EEC and 99/5/EC.
Type of product : CB Transceiver
Details of applied standards : EN 300 433, EN 300 135-2
EN 301 489-1, EN 301 489-13
EN 60065
Manufacturer : INTEK S.R.L.
Via G. Marconi, 16
20090 Segrate, Italy
Tel. [phone] / Fax. [phone]
E-mail : [email protected]
Notified Body : EMCCert Dr. Rasek
Boelwiese 5, 91320 Ebermannstadt
Germany
Identification Number : 0678
Contact Reference : Armando Zanni
Tel. [phone] / Fax. [phone]
E-mail : [email protected]
Segrate, 30/05/2005 dr. Vittorio Zanetti
(General Manager)
DECLARATION OF CONFORMITY
EC Certificate of Conformity
(to EC Directive 99/5-89/336-93/68-73/23)

Index
- 1 -
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Content of the packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Controls and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Frequency bands table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Frequency band selection / programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table of restrictions on the use of CB transceivers . . . . . . . . . . . . . . . . . . 12-13
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ESP Compander Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
PCB - Main Board & CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-31
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-35
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-37
0678
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.
NOTICE !
Before using this transceiver, please check that the radio has been programmed on the
frequency bands, specifications and operating modes allowed by the regulations valid in
the country where the product is used. If not, please proceed to modify the frequency
band programming, as it is described in this owner’s manual. This transceiver is factory
pre-programmed on the CE European frequency band (CEPT 40CH FM 4W).
CH
English

Introduction - Content of the packaging
- 2 -
Congratulations!
Congratulations for selecting and purchasing an INTEK quality product. This transceiver
includes a number of advanced functions and systems, therefore it is definitely necessary
to carefully read this owner’s manual before using the radio. With a correct use of the
product in accordance with the operating method described in this manual, the product will
offer a trouble free use for many years. INTEK is constantly engaged to develop and
provide quality products meeting the customers requirements, however any suggestion or
comments on this product that might help us to improve quality are warmly welcome.
INTEK M-790 PLUS is a CB transceiver using advanced hardware and software design,
it includes a special multi-standard programmable circuit, which allows to program the
specifications of the radio (frequency bands, operating modes, transmitter power) in
compliance with the regulations valid in the various European countries. Therefore this
product can be used in any country of the European Community. The radio is delivered
factory pre-programmed on the CE European frequency band (CEPT 40CH FM 4W).
Content of the packaging
Please check that all the following items are contained in the packaging :
main unit (transceiver)
DC power cord with fuse holder and fuse
dynamic microphone
car mounting bracket
car mounting bracket accessories (hardware, knobs, etc.)
microphone bracket
owner’s manual
English

Controls and operation
- 3 -
Front panel
English
1. DW / EMG Key
This key is used to enable the DW (Dual Watch) function and the EMG (Emergency
Channels) function.
DW (Dual Watch)
The DW (Dual Watch) function allows automatic monitoring of two programmable
channels. Refer to the following procedures to enable this function. Select the first
channel to monitor using the channel selector knob (6) or the channel selector keys
on the microphone (18, 20). Press the DW key for about 1.5 seconds and the DW
icon will blink on the LCD display. Select now the second channel to monitor,
following the same procedure. Finally press the DW key for about 1.5 seconds and
the two programmed channels will be alternately indicated on the LCD display. Radio
will automatically start monitoring (scanning) the two programmed channels. When a
signal is detected on one of the channels, scanning stops and it is possible to listen to
communication on that channel. It is possible to transmit on the channel, by pressing
the PTT key (17). If there is no transmission within 5 seconds, radio will start
scanning the two channels again. When the DW function is enabled, the DW icon (F)
appears on the LCD display. To exit the DW function, shortly press the DW key or the
PTT key (17).
1
11 10 9 8 712
2 3 4 5 6
EMG SCAN ESP
TX / RX
DW
Q.UP
LCR
Q.DN
AM/FM
CHANNEL
M-790 PLUS
OFF/VOL SQUELCH

Controls and operation
- 4 -
English
EMG (Emergency Channels)
Shortly press the DW/EMG key to select the emergency channels. Two emergency
channels (CH9, CH19) are pre-programmed according to the selected frequency
band (refer to the following table). Each time the key is shortly pressed, radio selects
CH19, then CH9, then the normal operating channel. When an emergency channel is
selected (CH9, CH19), the EMG icon (N) appears on the LCD display.
2. SCAN Key
By pressing the SCAN key, the SCAN (automatic scanning of busy channels) function
is enabled. To enable the SCAN function, first turn the SQUELCH control (10)
clockwise, until the background noise is cut. Then press the SCAN key, radio will
automatically start scanning all channels continuously and the SCAN icon (O) will
appear on the LCD. Auto-scan stops if a signal is detected on a channel, in order to let
the user listen to the incoming signal and will start scanning again when no signal is
detected on that channel. It is possible to remain on that channel by pressing the PTT
key (17) within 5 seconds, otherwise radio will start scanning again. Auto-scan may be
also re-started at any time by pressing again the SCAN key. To exit the SCAN mode,
shortly press the PTT key (17).
3. ESP (Electronic Speech Processor) Key
The ESP (Electronic Speech Processor) is an exclusive advanced feature in some of
the new INTEK mobile CB radios. ESP means Electronic Speech Processor, in other
words electronic modulation processor. This microprocessor controlled audio device
is also called COMPANDER (Compressor-Expander), it works as a modulation
compressor in transmission and as a modulation expander is receive mode. The ESP
allows to obtain a stronger, cleaner and clearer audio signal and it is a great help in
noisy areas, in case of long distance communication or with weak signals. The
efficiency of ESP is even greater when communicating with other radios having the
same system. To enable or disable the ESP function, press the ESP key. When the
ESP function is enabled, the ESP icon (M) appears on the LCD display.
COUNTRY
CODE
CH-9
CH-19
I0
AM
AM
I2
AM
AM
DE
AM
AM
D2
AM
AM
EU
AM
AM
CE
FM
FM
SP
AM
AM
FR
AM
AM
UK
AM
AM
PL
AM
AM
Modulation without ESP Modulation with ESP
100%
0%
100%
ESP performance
of the modulation
in RX and TX modes

Controls and operation
- 5 -
English
4. TX/RX Indicator
This green-red dual colour LED indicator lights up in green colour when radio is in
receive mode and in red colour when radio is in transmit mode.
5. LCD Display
Large size LCD display with an orange colour backlighting system, for best
readability. The LCD display shows all the enabled functions as well as other
information programmable by the user, such as the programmed frequency band
code. It also includes a digital 10-bar S/RF Meter to monitor the strength/power of the
received and transmitted signals.
LCD Display
P
A
B
G
F
E
DC
O
N
M
H
L I
A. TX Icon
The TX icon is lighted when radio is in transmit mode.
B. RX Icon
The RX icon is lighted when radio is in receive mode.
C. FM Icon
The FM icon is lighted when radio receives and transmits in FM mode (frequency
modulation).
D. M Icon
Not used.
E. LOW Icon
The LOW icon is lighted when the transmitter is in the LOW POWER (1W) mode.

Controls and operation
- 6 -
English
F. DW Icon
The DW icon is lighted when the DUAL WATCH function (automatic monitoring of two
channels) is enabled.
G. Alphanumeric Digits
These two alphanumeric digits indicate the country code, in accordance with the
programmed frequency band (i.e. DE, UK, CE, etc.).
H. S/RF Digital Meter
A digital 10-bar S/RF METER indicates the strength of the received signal (from S0 to
S9+30) in the receive mode and the transmitter RF output power (0 to 4W) in the
transmit mode.
I. AM Icon
The AM icon is lighted when radio receives and transmits in AM mode (amplitude
modulation).
L. LOCK Icon
The LOCK icon is lighted when the LOCK function has been enabled.
M. ESP Icon
The ESP icon is lighted when the ESP (Electronic Speech Processor) function has
been enabled. The ESP is an RX & TX electronic modulation processor.
N. EMG Icon
The EMG icon is lighted when one of the special pre-programmed emergency
channels has been selected.
O. SCAN Icon
The SCAN icon is lighted when the SCAN function (automatic search of busy
channels) is enabled.
P. Alphanumeric Digits
These three numeric or alphanumeric digits indicate the operating channel number
(01 to 80, according to the programmed frequency band).

Controls and operation
- 7 -
English
6. CHANNEL Selector
This knob selects the channel number, by one channel steps. The knob may be
turned clockwise to select channels upward or counter clockwise to select channels
downward.
7. Q.DN (Quick Down) Key
This key allows fast selection of the operating channel downward. Each time this key
is pressed, the channel number moves down by 10 channels.
8. AM/FM and LCR Key
AM/FM SELECTOR
This key allows to select the AM or FM operating mode in both RX and TX. The
AM/FM operating mode selection is possible only if it is allowed the programmed
frequency band, otherwise the selection is not possible.
LCR
Pressing this key for about 1.5 seconds, the last used channel will be automatically
recalled.
UK / CE SELECTOR
If the UK frequency band has been programmed, shortly pressing this key, it will be
possible to select between the UK channels (frequencies) and the CE channels
(frequencies).
9. Q.UP (Quick UP) Key
This key allows fast selection of the operating channel upward. Each time this key is
pressed, the channel number moves up by 10 channels.
10. SQUELCH Control
The SQUELCH control allows to silent the receiver by cutting the background noise.
Turn the SQUELCH knob clockwise until the background noise is cut. Turn the
SQUELCH knob counter clockwise (SQUELCH opening) to listen to the weakest
signals.
11. OFF/VOL (OFF / Volume) Control
This knob switches the radio ON and OFF and it adjusts the volume control. If no
signals are being received on the operating channel, it is suggested to open the
SQUELCH and adjust the volume to the desired level while listening to the
background noise.
12. MICROPHONE Connector
Connect the supplied dynamic microphone to this connector, locking it through the
ring nut.

Controls and operation
- 8 -
English
Rear Panel
13. EXT (External Speaker) Jack
This jack is for connecting an external speaker (optional).
14. S-METER Jack
This jack is for connecting an external S-METER (optional).
15. ANTENNA Connector (SO-239)
Antenna connector. Refer to the section INSTALLATION OF THE ANTENNA.
16. 13.2VDC POWER CORD
13.2VDC power cord input.
ANTENNA
EXT S-METER
DC
13.2V
13 14
16
15
IMPORTANT !
Do never attempt to open the cabinet of the transceiver. No user serviceable parts inside.
Internal modifications or tampering may cause damage to the product, modify its
technical specifications and will void warranty rights. If service or repair are required,
please go to an authorised service centre or specialized technician.