Archive for September, 2015

Walkie-Talkie Frequency Guide

Spend a few minutes reading this Walkie-Talkie Frequency Guide and learn the basics of two-way radio frequencies. You’ll gain a better understanding of how the Federal Communications Commission (FCC) has set aside specific radio bands for private, public and commercial use. These radio services are designed for different types of usage and each has its own regulations. Some require licenses to use; others don’t.

Two-way radios (or walkie-talkies) generally operate in the 136 MHz to 900 MHz frequency range, as defined by the FCC. This is an overview of the various services and bands of frequencies. For a complete guide to all the officially assigned frequencies, you can refer to the FCC Online Table of Frequency Allocations.

General Mobile Radio Service (GMRS) uses frequencies in the 462 and 467 GHz range, and shares some frequencies with the FRS service. GMRS, unlike FRS, requires an FCC license to operate within the GMRS frequencies. GMRS radios are usually handheld walkie-talkie units like FRS radios, and it is possible to find hybrid GMRS/FRS radios that can be used with either service.

Multi-Use Radio Service (MURS) operates at 5 frequencies between 151.820 and 154.600 MHz. This is a radio service similar to citizens band that does not require a license to operate. The FCC set aside these frequencies for two-way, private data or voice communications over a short distance. Using radio repeaters and transmitting above 2 watts with MURS is not allowed. This band can be used by businesses, but as it’s in the VHF range, it is not as effective for indoor communications as UHF.

Very High Frequency (VHF) operates at 136-174 MHz. Longer radio waves are able to cover a greater distance with less power. However, they work best in outdoor areas with fewer obstacles. VHF radio antennas tend to be longer than UHF radio antennas so they can transmit over a longer distance and accommodate the frequency range.

Family Radio Service (FRS) uses frequencies around 462 and 467 MHz in the UHF (ultra-high frequency) band. As its name suggests, it is meant as a personal radio service and is not intended for business use. FRS has less interference than what’s found with the Citizens Band (CB) service, which operates around 27 MHz.

Ultra-High Frequency (UHF) operates at 400-512 MHz. UHF two-way radios are best if there will be any indoor use, because the shorter radio waves can more easily penetrate obstructions that are found inside buildings. Higher frequencies are also preferred for outdoor urban settings with many obstructions and areas that are hilly or have a lot of trees. The higher the frequency, the smaller the antenna size can be, and with a portable walkie-talkie antenna, this allows for maximum portability and a smaller design.

Extreme Radio Service (EXRS) operates within a range of 900 MHz frequencies and has been set aside as a license-free band for 900 MHz digital two-way radios. The range is similar to UHF and 900 MHz digital radios work well indoors, but usually do not cover as great a distance outdoors. This band can be used by anyone of any age and for any purpose.

BRS: The Industrial/Business Radio Pool Service (Business Band) – The FCC has set aside certain frequencies for daily business operations, for specific companies that qualify. Acceptable uses include the support of “day-to-day business activities, such as dispatching and diverting personnel or work vehicles, coordinating the activities of workers and machines on location, or remotely monitoring and controlling equipment.” This includes low-band frequencies around the 27, 33, 35, 42 and 43 MHz range, VHF frequencies around 151, 154 and 158 MHz and selected UHF and GMRS frequencies between 462-469 MHz. An FCC license is required to use these frequencies.

Add comment September 29th, 2015

Does Size Still Matter? Exploring Antenna Size

By simply understanding the basics of antenna size, you can make better-informed choices when shopping for a two-way radio system, whether it’s a handheld unit, a mobile radio for your vehicle or a two-way radio base station.

The most important aspect of a radio antenna is that it is properly matched to your radio and the frequency band you’re operating on. The higher the wavelength, the longer the antenna needs to be to match it properly, and the wavelength is inversely proportional to the frequency. UHF frequencies have a shorter wavelength and therefore, the antenna can be shorter than for an equivalent VHF radio. A poorly matched antenna is a common cause of reduced range. So the answer is yes, size does matter, but bigger isn’t always better. It all depends on what your transmitting and receiving frequencies are.

Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency. With a handheld two-way radio, in many cases it is not even possible to remove the antenna. In fact, in some models, the antenna has been purposely embedded inside the radio, to make the unit more compact. Occasionally there are handheld radios that have removable antennas. If your radio can use different sized antennas, typically this is done so that you can switch out a whip antenna (which will give you wider coverage) with a stubby antenna, which will make the radio more compact. Obviously, using an external antenna with a handheld radio that you’re moving around with is not possible. If you’re using a stubby antenna, you might be able to switch to a longer antenna, but remember that it has to be correctly matched. The antenna that originally came with your handheld two-way has been specially “tuned” for that model and its frequencies.

More important than the length of the radio antenna is the height of the antenna. No, that isn’t the same thing. By height, we mean how far above the earth’s surface it is. The higher you can place the antenna, the further the range that you can successfully transmit and receive.

With a mobile radio that’s inside a vehicle, an external antenna becomes necessary because radio waves will be stymied by the metal of the vehicle. In this case, an externally-mounted antenna will give you better range. But again, the size of the antenna must be properly matched for the frequency you’re transmitting on.

It is also possible to extend the range of a handheld device with an antenna if it is part of a desktop base station. A base station radio might have a built-in antenna, but it can be disconnected and instead be connected by cable to an external antenna. The higher you’re able to mount the external antenna, the better the range will be. Mobile radios and base station radios are far more powerful than handheld radios, sometimes as high as 100 watts.

Keep in mind that with certain frequency bands, there may be limits to how high an external antenna can be. For MURS radios, the FCC dictates that the antenna height cannot be greater than 20 feet above a structure or 60 feet above ground level, whichever is greater.

In general, for achieving greater range with any type of two-way radio, you can raise the height of the antenna or increase the radio’s power. If possible, do both.

Add comment September 25th, 2015

Older product – DTR Radios

http://www.techwholesale.com/motoroladtr.html

Achieve Unparalleled Efficiency with Motorola Digital DTR Radios for Business

Harness the power of digital radio technology to advance your organization. With a relatively small investment and a few minutes of your time, you can significantly boost your business profits and get your workforce operating like a well-lubricated machine. You’ll learn how Motorola DTR Series digital business radios are far superior to VHF and UHF radios and how they combine the best features of two-way radios and cell phones for clear, reliable and inexpensive internal communications.

Digital Radios Benefit Every Business

There isn’t a company in the world that wouldn’t benefit from powerful, reliable and affordable digital two-way radios for their internal communications. Whether it’s a construction supervisor needing to relate the latest job specifications quickly to his on-site crew, a restaurant server wanting to let their supervisor and the hostess know that a table is ready or a security guard having to alert the rest of his crew about a possible intruder, communication is critical for an organization to run smoothly. The advances made in two-way radio technology provide many advantages over traditional UHF and VHF radio systems

Digital Radios Versus Analog Radios

With digital two-way radios, you have the flexibility of communicating privately with a single person (as you would a cell phone), speaking to a particular group or addressing everyone who’s on a digital radio and within range. Analog radios don’t allow for private conversations, so this is a great advantage, combining the power of a walkie-talkie with the convenience of a cell phone. Unlike their analog counterparts, digital business radios offer a perfectly clear audio signal over the entire range of coverage, with no interference or static. Also, a digital radio does not require an FCC license to operate. This means that there are no licensing fees and no paperwork to fill out, which saves you both time and money. Digital radios have a wide range of coverage. The Motorola DTR410 model has an outdoor range of up to 300,000 square feet and an indoor range of 25 floors. The Motorola DTR550 can cover up to 350,000 square feet outside or 30 floors indoors, making them the perfect choice for keeping employees, supervisors and managers in constant communication.

Flexible Calling Options with Motorola Digital DTR Radios

Motorola’s DTR Series two-way radios have many advanced features that put them at the forefront of the digital radio industry. Your calling choices are:

1-to-1 Private Calling – Speak privately with a specific user, as you would on a traditional phone.

1-to-Many Group Calling – Communicate with a public group of DTR users who share the same group ID and channel.

1-to-Many Calling – Call a private group that you previously programmed. This lets you communicate with specific sets of DTR group members.

1-to-Many with Private Reply – This allows users to respond privately to the call initiator once the group transmission is complete.

Motorola DTR Series Radios Deliver with Special Features

Other features of the DTR radios include extended battery life of up to 19 hours and the ability to send preset or custom SMS text messages. The radio’s Frequency Hopping Spread Spectrum (FHSS) gives you greater privacy with up to 500 license-free frequencies. The DTR digital radios have an extended battery life of up to 15 hours on a single charge.

Motorola’s Digital Radios – Made to Handle It All

The Motorola DTR digital radios meet rigorous Military Specifications 810 C, D, E and F for moisture, vibration, shock, dust and extreme temperatures. These are extremely durable digital radios that are built for harsh environments. They also meet Motorola’s requirements for long-lasting reliability, with a polycarbonate housing covered with rubber.

Take your company communications to the next level with Motorola DTR digital radios. They’ll quickly pay for themselves in terms of your team’s efficiency, enhanced security for personnel and property and customer satisfaction. Whether you need just a few radios or 100, Tech Wholesale offers the best pricing and free shipping. Their unsurpassed customer service and expertise makes them the most trusted source for your two-way business radios.

Add comment September 23rd, 2015

New product – Digital DLR radios

http://www.techwholesale.com/motorola-dlr-radios.html

Motorola Digital DLR Radios Revolutionize How Companies Do Business

Be one of the early-adopting organizations taking full advantage of today’s digital communication technologies. Better internal communication means a smoother-running business and increased profit. Digital business radios let teams communicate securely and reliably to keep everyone fully informed, on track and at the height of their game. At the forefront of the digital radio revolution are newly introduced Motorola DLR Series Digital Radios, which are sleekly designed, lightweight and loaded with advanced features.

Digital Radios: A Smart Solution to Real-Life Business Challenges

With a reliable, state-of-the-art two-way digital radio system, restaurant staff can alert the host or hostess that a table is ready for faster turnaround and better service. A retail clerk can notify their manager of an out-of-stock product or a problem on the floor. A construction supervisor can immediately relate new client specifications to a crew that’s on-site, keeping a project on time and within budget. A concert security crew member in a large stadium can immediately notify the rest of his security team when he notices a suspicious individual. Clear communication improves a company’s bottom line, keeps the public safe and keeps personnel fully informed, instantly.

The Digital Radio Difference

Digital two-way radios cover a wider range than standard radio systems. Unlike analog radios, the signal remains sharp and crystal clear to the very edge of the coverage area, with no static or interference. There is no FCC license required to operate digital business radios, so you’ll save money on frequency and radio licensing fees. You’ll also save valuable time in not having to deal with regulatory paperwork. A digital radio system combines the convenience and flexibility of a cell phone with the multi-user power of a walkie-talkie. You can privately communicate with individuals, talk to a distinct group on a single channel or speak to all users at once.

The Motorola DLR1020 and Motorola DLR1060

The Motorola DLR1020 and DLR1060 digital two-way radios boast an outdoor range of 2 miles and an indoor range of 300,000 square feet. These license-free digital business radios offer maximum communication flexibility with 4 calling options.

Private Reply – Speak privately to a person communicating with a group after the radio transmission ends, without having to call them on an extension or cell phone.

Direct Call – Call another user privately. This must be pre-programmed and can be assigned to the radio’s top button or assigned to a particular channel. Different direct calls can be set up on multiple channels. Use this to replace regular telephone communications for significant cost and time savings.

Call All Available – Communicate with everyone on all channels who is not currently on a call. This allows a supervisor or employee to relate vital information to everyone in the organization.

Page All Available – Contact all available radio users at once with a 1-way group voice announcement. This is useful for locating a particular employee or when asking for information or assistance.

Other advanced features of the DLR1020 and DLR1060 digital radios include Computer Programmable Software (CPS) to personalize radio settings, an easy-to-navigate advanced configuration menu with voice prompts and a long battery life of up to 14 hours. The DLR1020 is a 2-channel digital radio, while the DRL1060 model has 6 channels for larger organizations that have multiple groups of personnel.

Rugged Enough for Military Use

The DLR Series radios from Motorola are built to stringent Military Specifications 810 C, D, E, F and G, which tests the radio’s resistance to vibration, shock, dust and extreme temperatures. The radio’s housing is made from antimicrobial polycarbonate to withstand harsh operating environments.

Tech Wholesale gives you the information and expertise you need to choose the perfect two-way radio system for your company. Read more about the Motorola DLR1020 and their DLR1060 model and take advantage of the low price and free shipping offered. With the power of Motorola’s digital radios, your team will be ahead of the technology curve and ready to meet any business challenge.

Add comment September 23rd, 2015