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Setting CTCSS to ‘00’ allows the radio to receive all transmissions, regardless of CTCSS tone. 

 

VOX 

NOTE: The VOX feature will work the same without a headset by following these instructions 
but do not plug in a headset.  Speak into the ATT650/655 series microphone and the transceiver 
will transmit and switch to receive after you stop speaking into the microphone.  The transceiver 
behaves exactly like a speakerphone in this mode without the headset. 

 

The voice activated transmission (VOX) function allows your voice to activate the PTT  
automatically. This may be useful when the radio is used with an optional hands free headset. 
To access the VOX menu, press [F] in the channel selection mode until ‘Uo’ appears and VOX 
option flashes. Press the [ ] and [ ] to select from Hi, nr, Lo or OFF. Press the [M] button 
momentarily to confirm your selection. The high, normal (nr) or low setting determines VOX 
response sensitivity.  Select Hi when in a quiet environment and Lo for a noisy environment 
 

Transmission Power  

The transmission power is internally set to low power on channels 8 to 14, and is high on the 
other channels to comply with FCC regulations for power limits on FRS and GMRS channels. 
Channels 1 to 7 are shared between FRS (low power) and GMRS (high or low power) , 8 to14 
are exclusively FRS with only low power allowed, and 15 to 22 are for GMRS use with high or 
low power permitted. 
Note: The output power is automatically selected depending on which channel you are using 
and cannot be changed by the user. 
  

 

Notes for good communication 

Your radio’s channels are shared on a ‘take turns’ basis. This means other groups may be  
talking on any of the channels. A common code of courtesy is to switch to another vacant  
channel and not to attempt to ‘talk over’ or interrupt someone who is already using a channel. 
Your radios have been designed to offer the best performance and transmission range. To avoid  
interference, it is recommended that you do not use the units within 2m (6 feet) of one another. 
For best transmission results, always keep the radio 10~15cm (4 –6 inches) away from your 
mouth. Speak slowly and clearly into the microphone and avoid releasing the PTT until you 
have finished speaking. 

Care and maintenance 

Clean your unit with a damp (never wet) cloth. Solvent or detergent should never be used. 
Avoid leaving your unit in direct sunlight or in hot, humid or dusty places. 
Keep your unit away from heating appliances and sources of electrical noise such as fluorescent  
lamps or motors. 
 
 
 
 

Summary of Contents for ATT650CM

Page 1: ......

Page 2: ...o the ATT655LE ATT650CM ATT650CMB has 38 CTCSS sub channel tones to provide clearer communication without hearing unwanted signals Package Contents Model ATT655LE 1 GMRS Radio Unit 2 Detachable Belt clip 3 Neck Strap 4 Owner s Manual 5 Alkaline Batteries 4 Model ATT650CMB 1 GMRS Radio Unit 2 Detachable Belt clip 3 Neck Strap 4 Owner s Manual 5 AC Adapter Model ATT650CM 1 GMRS Radio Unit 2 Detachab...

Page 3: ...l 9 On Off Enter button 10 Function button F 11 Internal Microphone 12 External Headset Charging Jack Ω 13 Belt clip detachable 14 Battery Cover FCC WARNING Replacement or substitution of transistors diodes or other parts of a unique nature with parts other than those recommended by the manufacturer may cause a violation of the technical regulations of Part 15 of FCC Rules SAFETY INFORMATION Your ...

Page 4: ...esidential installation This equipment uses and can generate radio frequency energy if not installed and used in accordance with the instruction it may cause harmful interference to radio communications However there is no guarantee that the interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be deter...

Page 5: ...ommended and will void the warranty Non approved batteries could potentially pose a safety risk also Warning Do not attempt to charge depleted non rechargeable Alkaline or standard carbon zinc batteries as this could present a potential safety risk Name brand NiMH batteries including Energizer Rayovac Duracell and Panasonic AAA 1 2 volt 650 mAh or higher capacity will perform well when used with t...

Page 6: ... 1 Key lock indicator Appears when the key lock is activated 2 VOX indicator Flashes in VOX edit mode and appears when VOX is activated 3 Large display Indicates the channel number Displays the main MENU in the function edit mode indicating CH for channel and Uo for VOX operation 4 Small display Shows the CTCSS Sub Channel tone or code Displays the SUBMENU in the function edit mode including Hi nr...

Page 7: ...transceiver acts like a filter and only allows reception of signals with the same Sub Channel Since there are 38 Sub Channels for each main channel 38 different Sub Channels may be selected for each of the 14 main channels To be sure others with different tones are not using your main channel before you transmit a common code of courtesy dictates that you press the Monitor button momentarily to se...

Page 8: ...ower limits on FRS and GMRS channels Channels 1 to 7 are shared between FRS low power and GMRS high or low power 8 to14 are exclusively FRS with only low power allowed and 15 to 22 are for GMRS use with high or low power permitted Note The output power is automatically selected depending on which channel you are using and cannot be changed by the user Notes for good communication Your radio s chan...

Page 9: ...buildings trees or other obstructions Radio channel frequency table Channel No Freq MHz Channel No Freq MHz 1 462 5625 12 467 6625 2 462 5875 13 467 6875 3 462 6125 14 467 7125 4 462 6375 15 462 5500 5 462 6625 16 462 5750 6 462 6875 17 462 6000 7 462 7125 18 462 6250 8 467 5625 19 462 6500 9 467 5875 20 462 6750 10 467 6125 21 462 7000 11 467 6375 22 462 7250 CTCSS tone frequency table Code Freq ...

Page 10: ... an explosion Turn your transceiver off wherever posted notices restrict the use of radios or cellular telephones Facilities such as hospitals may use equipment that is sensitive to RF energy Turn your transceiver off while on board aircraft when requested to do so Do not place your transceiver in front of a vehicle s air bag If the air bag deploys it could propel the transceiver like a projectile...

Page 11: ...eries No transmission while pressing the PTT button Incorrect battery polarity Install the batteries in the directions indicated on battery tray Weak batteries Charge or replace batteries Channel and privacy code not Set the same as target transceiver Adjust the transceiver s settings to match those settings of the target transceiver Volume level too low Increase volume level PTT button inadverten...

Page 12: ...Y 11779 USA Phone 800 354 8785 Phone 631 981 1600 Fax 631 981 1702 In no event shall KNG America or AT T Corp be liable for any indirect special incidental or consequential loss or damage including without limitation damages for loss of profits savings or data in any way related to this product When returning this product A You will need to call our toll free number 1 800 354 8785 and ask for the ...

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