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TECHNICAL SPECIFICATIONS

Frequency Range ............................................................... 144-146MHz & 430-440MHz (Rx / Tx)
Memory channels ....................................................................................................... 128 channels
Operating Voltage ..................................................................................................................... 7.4V
Operating Temperature ........................................................................................... -30°C to + 60°C
Working Mode .................................................................................................monoband/dualband
Output Power.................................................................................................... VHF: 5W / UHF:4W
Modulation ..........................................................................................................................F3E(FM)
Max. Frequency Deviation ..................................................................................................

≤ ±5KHz

Spurious Radiation .............................................................................................................. < -60dB
Frequency Stability ............................................................................................................

±2.5 ppm

Receive Sensitivity .............................................................................................................. < 0.2uV
Audio Output power ..........................................................................................................

≥ 500mW

Dimension.........................................................................................................58 X 105 X 39 (mm)
Weight ......................................................................................................................................250g

Specifications are subject to change without notice.

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Summary of Contents for ct 790

Page 1: ...ircuits If it appears that the Radio diffuses peculiar smell or smoke please shut off its power immedia tely and take off the charger or battery from the Radio Do not transmit without antenna Main functions Dual Band Dual Frequency Dual Display and Dual Standby Frequency Range 144 146MHz 430 440MHz Rx Tx Working mode U V V V or U U available Same channel VHF T x UHF Rx or UHF T x VHF Rx available ...

Page 2: ...n transmitting Menu Channel Reset DESCRIPTION OF THE DEVICE LCD display 1 2 4 6 3 5 16 15 7 14 13 12 11 10 9 8 Busy channel locked 1 High low power transmitting 2 Frequency selected 3 CTCSS 4 DCS 5 Split positive 6 Split negative 7 Reverse frequency 8 Dual band 9 VOX function 10 Received signal on Vice frequency 11 Bandwidth indicator 12 Battery level indicator 13 Menu channel number 14 Menu chann...

Page 3: ...ume control 26 Transmission led 27 Single dual band switch key 28 Exit 29 key Reverse frequency Scan key 30 Lock key Stopwatch timer key 31 PTT 32 push to talk key Side key1 Scan Lamp SOS CH Radio 33 Side key2 monitor long press flashlight 34 short press Ext speaker microphone jack 35 Battery latches 36 17 18 19 20 21 22 23 24 31 30 29 28 27 26 25 34 33 32 36 35 ...

Page 4: ...ng and the vice frequency is only for receiving When the vice frequency receives a signal the screen displays S SCAN key Press slightly the Scan key to set the Reverse Frequency ON OFF Keep it pressed for 2 secon ds to activate the Scan function Side key 2 Press slightly the Side key 2 to turn ON OFF the flashlight Keep it pressed for 2 seconds to enable the Squelch function 1750Hz Burst Tone Some...

Page 5: ...ignal is weak Set the same DCS codes of your group and turn on the squelch By setting the level too high you may not receive the weak signals while by setting it too low you may receive noises or undesired signals NOTE This transceiver has ten 0 9 available levels 0 means that the Squelch is turned on From level 1 to level 9 you will have different levels of noises reduction The higher is the leve...

Page 6: ...de press EXIT VOX VOX MENU 7 This function allows hands free conversations just speak in the direction of the microphone and the communication will be automatically activated As the VOX should check the voice transmission will be a little delayed and the beginning voice may not be transmitted In standby mode press MENU 7 The screen will display VOX Press MENU to enter the function Press the button...

Page 7: ...firm To return to the standby mode press EXIT BUSY CHANNEL LOCKED BCL MENU 13 This function prevents the interference of other communicating channels If the selected channel has been occupied by pressing the PTT button the transceiver will not transmit In standby mode press MENU 13 The screen will display BCL Press MENU to enter the function Press the buttons to select ON OFF then press MENU to co...

Page 8: ... confirm To return to the standby mode press EXIT NOTE This transceiver has 105 DCS groups TRANSMIT WITH DCS T DCS MENU 18 In standby mode press MENU 18 The screen displays T DCS Press MENU to enter the function Press the buttons to turn OFF this function or to select a DCS code from D023N to D754I then press MENU to confirm To return to the standby mode press EXIT NOTE This transceiver has 105 DC...

Page 9: ...each time To stop transmitting press any key If a carrier signal appears during the transmission interval the radio starts receiving After the carrier signal disappears the transceiver will resume transmitting the SOS signal auto matically Press any key to stop transmitting the SOS signal NOTE This function can be used only after have set the channel frequency band In standby mode press MENU 20 Th...

Page 10: ...el mode In standby mode press MENU 21 then press the buttons to choose the working mode Press MENU to confirm You can shift between Channel mode and Channel Name mode only after have stored at least one channel and one named channel AUTOBACKLIGHT ABR MENU 22 In standby mode press MENU 22 The screen will display ABR Press MENU to enter the function Press the buttons to enable disable ON OFF the aut...

Page 11: ... The screen displays six _ symbols Press to select the character and to confirm and go on then press again to select the se cond character and to confirm and go on After have selected the sixth characters press MENU to confirm To exit the function press EXIT The screen displays the channel name and also the channel number on the right corner of the display STORED CHANNELS MEM CH MENU 27 In Frequen...

Page 12: ...firm the screen will display RESET WAIT After have set the Reset the transceiver will auto power off and reboot again CTCSS DCS FREQUENCY SCAN SCN CD MENU 30 This function enable the scan of all CTCSS or DCS frequency codes When the transceiver is in receiving mode press MENU 30 the screen displays SCN CD Press MENU to enter the function Press the buttons to select to scan CTCSS or DCS then press ...

Page 13: ...transmit again BATTERY CHARGE Insert the AC plug into the outlet AC 90 240V The charger indicator start blinking indicating that it is in charging standby Insert the transceiver with the battery pack into the charger the RED indicator turns on indicating that the recharging begins Once the led indicator become green the battery pack will be fully charged NOTE If the battery pack is totally dischar...

Page 14: ...no sound heard Make sure the volume is not too low Make sure to have the same CTCSS and DCS codes of your group The keypad doesn t work keypad lock function hasn t been enabled In standby the radio transmit without pressing PTT VOX level has been set too low Adjust it Some functions cannot be stored Ensure to be on Channel mode In Channel mode some functions can be set only through the programming...

Page 15: ...ating Temperature 30 C to 60 C Working Mode monoband dualband Output Power VHF 5W UHF 4W Modulation F3E FM Max Frequency Deviation 5KHz Spurious Radiation 60dB Frequency Stability 2 5 ppm Receive Sensitivity 0 2uV Audio Output power 500mW Dimension 58 X 105 X 39 mm Weight 250g Specifications are subject to change without notice ...

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