Two Way Communications
From police and fire department dispatches to aircraft communication, 2 way radio communication works to ensure public safety. This medium becomes particularly important in emergency situations.
Broadcast Radio
Radio broadcasts on AM and FM have been informing and entertaining the public for nearly a century. Today, this medium of communication continues to offer diversity in programming.
Cell Phones
Cell phones are actually sophisticated radios that receive signals from low-power stations operating on similar frequencies over a given area. Cities are usually divided into areas called cells, each of which contains a transmitting station.
2013年1月8日星期二
How to Change the Channels on a Motorola Talkabout 4900
The Motorola TalkAbout T4900 is a recreational 2 way radio for contacting friends over a short distances without using a cell phone. Two-way radios are useful for hunting or camping trips when there may be little cellular reception. The T4900 has 22 broadcasting channels. Other radios on the same channel pick up transmissions from the T4900. Changing channel on your T4900 lets you synchronize your radio with others in your group.
1Twist the large dial on top of the Motorola T4900. The radio turns on.
2Press the “Menu” button between the “+” and “-” buttons. The current channel flashes on the screen.
3Tap “+” or “-” to scroll through the radio’s 22 channels.
4Push “PTT” to switch to your chosen channel. Hold “PTT” and talk into the radio on the new frequency.
1Twist the large dial on top of the Motorola T4900. The radio turns on.
2Press the “Menu” button between the “+” and “-” buttons. The current channel flashes on the screen.
3Tap “+” or “-” to scroll through the radio’s 22 channels.
4Push “PTT” to switch to your chosen channel. Hold “PTT” and talk into the radio on the new frequency.
How to Develop Code & Communicate With a Scanner
1Purchase a scanner, which is a radio used to transmit information. Scanners, sometimes called police scanners or 2 way radios, range in price from $100 or less to more than $1,000, depending on their specifications. Less-expensive scanners work well for personal use, such as monitoring transmissions for hobby or personal safety. Units that are more expensive are used by police and fire departments to provide stronger frequencies and outputs that are more powerful. Most electronics stores and online auction websites sell scanners.
2Set up your scanner by following the instructions that came with the unit. Find frequencies for various agencies by searching the dial or by looking up the official frequency on the agency’s website. Consult RadioReference.com for a database of frequencies for organizations throughout the United States.
3Learn the communication code. Police codes use codes with the prefixes “10-” and “11-” followed by numbers that correspond to various situations. For example, “10-4″ means “message received.” Long-haul truckers use a different set of codes to communicate. In the language of truckers, for example, the term “alligator” means there is a blown tire in the road, and a “salt shaker” is a snowplow.
4Develop your own code for communicating. If you are using your radio to communicate with someone, discuss terms you would like to codify for your own radio language. Consider using the police or trucker codes as a base to work from when developing your own code language. For example, think of a nickname for the town you live in or a code word for the street you live on.
5Record your codes and distribute the information to others who will be using the information. You can do this with a notebook, computer document or online database, which all code users can modify when they think of a new code word.
2Set up your scanner by following the instructions that came with the unit. Find frequencies for various agencies by searching the dial or by looking up the official frequency on the agency’s website. Consult RadioReference.com for a database of frequencies for organizations throughout the United States.
3Learn the communication code. Police codes use codes with the prefixes “10-” and “11-” followed by numbers that correspond to various situations. For example, “10-4″ means “message received.” Long-haul truckers use a different set of codes to communicate. In the language of truckers, for example, the term “alligator” means there is a blown tire in the road, and a “salt shaker” is a snowplow.
4Develop your own code for communicating. If you are using your radio to communicate with someone, discuss terms you would like to codify for your own radio language. Consider using the police or trucker codes as a base to work from when developing your own code language. For example, think of a nickname for the town you live in or a code word for the street you live on.
5Record your codes and distribute the information to others who will be using the information. You can do this with a notebook, computer document or online database, which all code users can modify when they think of a new code word.
How to Use Only the Radio off of the Motorola i580 Network
Place the Phone in MOTO Talk Mode.
1Turn on the Motorola i580 phone.
2Open the phone’s main menu.
3Scroll down and highlight the “MOTO Talk” menu option. Press “OK” to select it. A display appears that says, “Switching to MOTO Talk Please Wait.” After a few seconds, the “MT Ready” signifier will appear on the display. This means that the phone is in MOTO Talk mode. As long as you can observe a 2 way radio icon in the display, the phone is in MOTO Talk mode.
Set Up the Radio Channel
4Place the phone in MOTO Talk mode.
5Use the phone’s soft keys to select “Edit” from the MOTO Talk Idle screen.
6Scroll down and highlight “Channel.” Select “Edit.”
7Select the radio frequency channel that you want to use. Each person in your group should set his or her phone to the same channel.
8Use the phone’s soft keys to select “Back” to return to the MOTO Talk Idle screen.
1Turn on the Motorola i580 phone.
2Open the phone’s main menu.
3Scroll down and highlight the “MOTO Talk” menu option. Press “OK” to select it. A display appears that says, “Switching to MOTO Talk Please Wait.” After a few seconds, the “MT Ready” signifier will appear on the display. This means that the phone is in MOTO Talk mode. As long as you can observe a 2 way radio icon in the display, the phone is in MOTO Talk mode.
Set Up the Radio Channel
4Place the phone in MOTO Talk mode.
5Use the phone’s soft keys to select “Edit” from the MOTO Talk Idle screen.
6Scroll down and highlight “Channel.” Select “Edit.”
7Select the radio frequency channel that you want to use. Each person in your group should set his or her phone to the same channel.
8Use the phone’s soft keys to select “Back” to return to the MOTO Talk Idle screen.
How to Program a Radio Scanner
Programming a radio scanner will allow you to listen to conversations and codes of those who communicate via 2 way radio frequencies. These can include law enforcement and fire departments, companies that have crews working out in the field and individuals who communicate via cell phone and two-way radio frequencies.
1Choose “Program Radio” on the main screen using the menu buttons on your radio scanner. Consult the owner’s manual to make sure you do this properly. Some radio scanners require you to hold down the “Menu” or “Program” button in order to achieve the programming options.
2Notice the flashing channel numbers on your main screen panel. Your radio scanner might have anywhere from 10 to 200 programmable channels.
3Write down the frequencies that you’d like to program into your scanner. Scan through the various frequencies to determine which ones are of greatest interest to you.
4Scan your radio to the first frequency you want to add to your radio scanner. Then, press the correct button to coordinate that particular frequency with the first channel on your radio scanner. Your specific requirements for programming may vary depending on which brand of radio scanner you’re using.
5Repeat Step 4 until you’ve programming your radio scanner for all the frequencies you’d like.
6Press the “Menu” button again to finalize your programming.
1Choose “Program Radio” on the main screen using the menu buttons on your radio scanner. Consult the owner’s manual to make sure you do this properly. Some radio scanners require you to hold down the “Menu” or “Program” button in order to achieve the programming options.
2Notice the flashing channel numbers on your main screen panel. Your radio scanner might have anywhere from 10 to 200 programmable channels.
3Write down the frequencies that you’d like to program into your scanner. Scan through the various frequencies to determine which ones are of greatest interest to you.
4Scan your radio to the first frequency you want to add to your radio scanner. Then, press the correct button to coordinate that particular frequency with the first channel on your radio scanner. Your specific requirements for programming may vary depending on which brand of radio scanner you’re using.
5Repeat Step 4 until you’ve programming your radio scanner for all the frequencies you’d like.
6Press the “Menu” button again to finalize your programming.
How to Clear Reception on a Walkie-Talkie
A walkie-talkie is a 2 way radio that uses radio waves to communicate with another walkie-talkie device on the same frequency within a communicable distance. As with other mobile devices, the reception on your two-way radio may be disrupted. In most cases, you can clear the reception on your walkie-talkie by changing the frequency channel.
1Turn the walkie-talkie on and press the “Menu” button. Scroll down the list until your see the “Channel” option. Select that option.
2Press the “+” or “-” button or the up and down arrows to change the frequency on your walkie-talkie. Every time you change the frequency, listen for static or background noise.
3Continue changing the channels until you reach a frequency that has no static or background noise.
4Press the “Push to Talk” (PTT) button to save the frequency. Make note of the channel that you are using to transmit your radio signals.
1Turn the walkie-talkie on and press the “Menu” button. Scroll down the list until your see the “Channel” option. Select that option.
2Press the “+” or “-” button or the up and down arrows to change the frequency on your walkie-talkie. Every time you change the frequency, listen for static or background noise.
3Continue changing the channels until you reach a frequency that has no static or background noise.
4Press the “Push to Talk” (PTT) button to save the frequency. Make note of the channel that you are using to transmit your radio signals.
How to Get a FCC License for a Motorola CP200
Motorola’s CP200 is a portable 2 way radio available in a 4-watt VHF and a 5-watt UHF model. It is frequency programmable and can operate on either four or 16 channels. The CP200′s primary controls include a large push-to-talk button, one large rotary channel selector and a single rotary on/off/volume control. To screen out interference from others using the same frequency, 42 standard tone private line codes and 84 standard digital private line codes are included. The Motorola CP200 comes with a 2250 mAh lithium ion battery and a charger. This radio operates on frequencies and at power output ratings which require Federal Communication Commission licensing.
1Determine the primary use of the CP200. For business applications, such as construction crews, event staffs or security personnel, the CP200 requires an FCC business radio service license. For private use, such as maintaining communication with family members around your residence or for recreational activities like hiking, the CP200 requires an FCC general mobile radio service license.
2Apply for an FCC Business Radio Service license. If you’ll be using the CP200 for commercial purposes, count the number and the anticipated frequencies of the CP200 radios in your business system. Provide the information to an FCC-authorized private frequency coordinator to receive approved frequency allocation. File an application for the business radio service license online at the FCC Universal Licensing System website. As of May, 2011, the fee for the BRS license is $260. The license is valid for five years. Ten days after filing your application, you are permitted to begin conditional operation until you receive the formal license.
3Apply for an FCC general mobile radio service license if use will be restricted to home/family activities. File an application for the license online at the FCC Universal Licensing System website or download FCC Form 605 and apply by mail. As of May, 2011, the fee for the license is $85. The license is valid for five years.
1Determine the primary use of the CP200. For business applications, such as construction crews, event staffs or security personnel, the CP200 requires an FCC business radio service license. For private use, such as maintaining communication with family members around your residence or for recreational activities like hiking, the CP200 requires an FCC general mobile radio service license.
2Apply for an FCC Business Radio Service license. If you’ll be using the CP200 for commercial purposes, count the number and the anticipated frequencies of the CP200 radios in your business system. Provide the information to an FCC-authorized private frequency coordinator to receive approved frequency allocation. File an application for the business radio service license online at the FCC Universal Licensing System website. As of May, 2011, the fee for the BRS license is $260. The license is valid for five years. Ten days after filing your application, you are permitted to begin conditional operation until you receive the formal license.
3Apply for an FCC general mobile radio service license if use will be restricted to home/family activities. File an application for the license online at the FCC Universal Licensing System website or download FCC Form 605 and apply by mail. As of May, 2011, the fee for the license is $85. The license is valid for five years.
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