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CTCSS/CDCSS codes that preset on the current channel, Operations are as follows: 
1, Select a desired channel. 
2, Press the programmed UST key to enter the UST mode. 
3, Use the [

]/ [

] keys to select from the preset UST codes (the newly selected 

CTCSS/CDCSS code is valid in the UST mode only), then the CTCSS/CDCSS code on 
the current channel is set as the selected UST code. 
4, Repress the UST key to exit the UST mode, then the LCD resumes its initial display. 
 

Note:

 This configuration is automatically memorized if the UST Back Up function is 

enabled, or else, it will not be memorized once switching channel or power off. 

 

Home Channel 

Upon press the programmed Home Channel key, the radio will promptly go to the 
programmed home channel. 
When dual home channels are set, press the programmed Home Channel key to promptly 
go to Home Channel 1, press again to promptly go to Home Channel 2, and press for the 
third time to return to the original channel. 

 

2-Tone Encode Select (TTS) 

1, Press the programmed TTS key, the LCD displays the preset 2-tone number or alias. 
The LCD scrolls the alias if it exceeds 8 digits. 
2, Press the [

]/[

]key to select 2-tone number (01

32)or alias. 

3, Holding down the [PTT] to transmit the selected code. 
4, Upon release the [PTT], the signalling squelch is disabled and LED flashes orange, the 
LED lights green when signal is received, and flashes orange if signal off. 
5. If the programmed Monitor key is pressed, or no signal is received within the preset 
time period, the signalling squelch is enabled. 

 

Display Frequency 

Upon press the programmed Display Frequency key, the LCD displays the frequency of 
the current channel. 
 

Display Mode 

Upon press the programmed Display Mode key, the radio toggle among the following 5 
display modes: 
1. Channel alias 
2. Zone number followed by channel number, “1-CH1” 
3. Zone alias 
4. Channel frequency. 
5. Channel number followed by zone number, “CH 1-1” 

 

Summary of Contents for QM-790-U1

Page 1: ...7120790000 QM 790 U1 USER MANUAL Quantun Electronics LLC ...

Page 2: ...d with its operation and features z Do not touch the metal surface of the radio while it is in use z Do not mount the radio such that the chassis can come in contact with skin z High temperature may burn your skin Caution Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This device complies with part 15...

Page 3: ...e to the antenna i e 82cm 32inches z To comply with current FCC RF Exposure limitations the antenna must be installed at or exceeding the minimum safe distance indicated above and in accordance with the requirements of the antenna manufacturer or supplier z Vehicle Mounting The antenna can be mounted at the center of a vehicle metal roof or trunk lid if the minimum safe distance is observed z Ante...

Page 4: ...Operational Instructions and Training Guidelines FCC Compliance Precautions Supplied Accessories Radio Overview Parts of the Radio Table below explains the functions of the LEDs and beeps Programmable Auxiliary Functions Getting Started Basic Operations Programmable Auxiliary Functions Service ...

Page 5: ...ou to do so z Do not expose the radio to direct sunlight over a long time nor place it close to heating source z Do not place the radio in excessively dusty humid areas nor on unstable surfaces z Do not modify the radio for any reason z This equipment should be serviced by qualified technicians only Compliance with RF Energy Exposure Standards Your Quantun mobile radio is designed and tested to co...

Page 6: ... guidelines users should transmit no more than 50 of the time and always adhere to the following procedures Transmit and Receive To transmit talk push the Push To Talk PTT button to receive release the PTT button Approved Accessories For a list of Quantun approved accessories see the accessories page of this user manual or visit the following website which lists approved accessories http www Quant...

Page 7: ...radio with your authorized frequencies signaling codes etc and will be there to meet your communications needs as your system expands Operation Guidelines z For vehicles equipped with electronic anti skid braking systems electronic ignition systems or electronic fuel injection systems interferences may occur during the radio transmission If the foregoing electronic equipments are installed on your...

Page 8: ...cation such that during radio transmission any person can come closer than the above indicated minimum safe distance to the antenna i e 82 cm 32inches z To comply with current FCC RF Exposure limitations the antenna must be installed at or exceeding the minimum safe distance indicated above and in accordance with the requirements of the antenna manufacturer or supplier z Vehicle Mounting The anten...

Page 9: ...dealer Upon unpacking of the QM 790 U1 mobile radio please ensure that all items shipped were received report any missing or damaged items to your dealer Accessories Item Qty PCS Palm Microphone 1 Microphone Hanger 1 Microphone Hanger Screws 3 Mounting Bracket 1 Adjust knob 4 Bracket Mounting Screw Set 6 Fuse 2 DC Power Cable 1 User s Manual 1 ...

Page 10: ...ls 3 Programmable Functions Key The keys are programmable with auxiliary functions by your dealer Please refer to the Programmable refer Functions Keys section 4 LED Indicator 5 Speaker 6 Power Switch 7 Programmable functions Keys P1 P2 P3 P4 The P1 P2 P3 P4 keys are programmable with auxiliary Functions by your dealer Please refer to the Programmable Functions Keys section 8 Microphone Jack Plug ...

Page 11: ...stal To connect the external antenna LED Indicator Transmitting LED glows red Receiving LED glows green when carrier presents Scanning Green LED flashes once every 1 second Encoding DTMF PTT ID 2 Tone MDC1200 1 LED glows red while transmitting 2 LED glows orange when transmission ends Decoding DTMF 2 Tone MDC1200 Orange LED flashes after the signaling is successfully decoded Function Key Press One...

Page 12: ...f 2 CH Up 3 CH Down 4 Zone Up 5 Zone Down 6 Monitor A 7 Monitor B 8 Monitor C 9 Monitor D 10 Display Frequency 11 Display Mode 12 User Selectable CTCSS CDCSS UST 13 2 Tone MDC1200 DTMF Encode Select 14 TX Power Select 15 Scan 16 Scan Add Delete 17 Reverse Frequency 18 Talk Around 19 Select Squelch Level 20 Home Channel 22 Scrambler 23 Voice Comp 24 Emergency Call ...

Page 13: ... Appears when the selected channel is busy 2 The bar number indicate the channel RSSI Appears when the transmitting power is low Appears when press MONI Key Appears when call transmission is selected 1 C Indicating that the selected channel is contained in the scan list 2 C Indicating that the selected channel is programmed as priority channel 1 3 C Indicating that the selected channel is programm...

Page 14: ...he scan function is activated Appears when compander function is enabled Appears when scrambler function is enabled Appears when GPS function is enabled Appears when VOX function is enabled Appears when the Aux port is activated ...

Page 15: ...er level saves battery and reduces the possibility of interference Use the high power setting only when necessary Note If the current channel is programmed with lower power press the Tx Power Select key prompts an error tone and the power level will not change If you switch to low power on a channel that was set with high power this configuration is done on all other channels that were set with hi...

Page 16: ...ther to transmit connect ID BOT ID and Disconnect ID EOT ID when connecting or disconnecting a repeater or telephone system The following modes are programmable 1 BOT ID occurs on each press of PTT EOT ID occurs on each release of PTT 2 Press the while holding down the PTT then BOT ID is transmitted Pres the while holding down the PTT then EOT ID is transmitted VOX Operation When hands free operat...

Page 17: ...an Radio scans all the channels that added into the scan list on the current zone 2 Multi Zone Scan Multiple zones that added into a multi scan list can be scanned All channels within all the zones that added into the scan list can be scanned Scan Start 1 Add one or several non priority channels into the scan list 2 Press the programmed Channel Scan key to initiate scan from the current channel an...

Page 18: ...nd 2 Scan Add Delete If the Scan Add Delete feature is enabled by your dealer the current channel can be added deleted to from the scan list as the following procedures 1 Select a channel to be added deleted in the non scan mode 2 The current channel toggles between Add Delete status upon each press the programmed scan Add Delete key Note Only channels that added into the scan list can be scanned ...

Page 19: ...k tone that is the D tone will not be heard while transmitting but only a delay The delay time of the D character is programmable bu your dealer DTMF Speed 6 8 10 or 15 digits per second is programmable by your dealer The feature is designed to reduce false decode by providing a fixed interval time between digits Default 10 digits per second Store DTMF Numbers Allows you to store a DTMF number up ...

Page 20: ...tored number is cleared Redial 1 Press the key on the microphone keypad the LCD displays A 2 Press the 0 key twice then the last dialed number up to 16 digits is dialed and displayed on LCD 3 Press the PTT the number is transmitted Note The redial memory is cleared once radio power off CallⅠ CallⅡ Press the programmed CallⅠ CallⅡkey to transmit the stored DTMF code 2 Tone MDC1200 signaling Safety ...

Page 21: ...r is received the user can hear from the transmitter without any other operation 2 The icon flashes on LCD and the LED flashes orange 3 Radio is muted upon press the programmed Monitor key or no signal is received within the preset time period 4 If the alert tone is enabled radio will emits alert tone when match signalling is received lf the Transpond is enabled radio will transpond a tone to the ...

Page 22: ...otects the radio from damage caused by long time transmission Once a continuous transmission exceeds the preset time 15 1200s programmable the transmission is automatically terminated and alert tone is heard The alert tone ceases upon release the PTT The TOT default is 180s it meets normal operation needs Any change should be permitted by professional technicians TOT Pre alert The radio has a TOT ...

Page 23: ...nd feature is enabled the Rx frequency is used in place of the Tx frequency when transmitting and the CTCSS CDCSS decoding signal is used in place of the encoding signal when encoding Press the programmed Talk Around key to toggle the Talk Around function ON or OFF TA1 CH1 Enabled Disabled Selectable Squelch Level SQL 1 Upon press the programmed SQL key LCD displays the current squelch level as th...

Page 24: ...gain to promptly go to Home Channel 2 and press for the third time to return to the original channel 2 Tone Encode Select TTS 1 Press the programmed TTS key the LCD displays the preset 2 tone number or alias The LCD scrolls the alias if it exceeds 8 digits 2 Press the key to select 2 tone number 01 32 or alias 3 Holding down the PTT to transmit the selected code 4 Upon release the PTT the signalli...

Page 25: ...scrambler feature ON of OFF When the feature enabled the LCD displays the icon Note the emphasis de emphasis feature is disabled while the scrambler is ON and enabled while the scrambler is OFF Rental Time Indicator Upon press the programmed Rental Time Indicator key the radio sounds 1 2 3 4 or 5 to indicate the remaining time that the user is allow to use the radio The Rental Time is programmable...

Page 26: ...tun dealer If you find it inconvenient to have service performed by your local dealer you may contact Quantun below Quantun Electronics LLC 1379 Shotgun Road Sunrise Florida 33326 USA Main line 954 598 3500 Toll Free USA 888 361 0521 www quantun com ...

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