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Jan 22, 2024 · ATT works by selectively attenuating the audio frequencies across the entire sound spectrum. This means that all frequencies, from low bass to high treble, are equally affected by the volume reduction. By maintaining the balance between different frequencies, ATT ensures that the overall audio output remains clear, regardless of the volume level.
Apr 10, 2023 · When you listen to a radio station and the announcer says, "You are listening to 91.5 FM WRKX The Rock!," what the announcer means is that you are listening to a radio station broadcasting a frequency modulated (FM) radio signal at a frequency of 91.5 megahertz, with FCC-assigned call letters of WRKX.
Welcome to Reddit's own amateur (ham) radio club. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the world experiment and communicate with each other on frequencies reserved for license holders.
- Two Way Radio Frequency Bands
- Ultra High Frequency (UHF) Radios
- 800 & 900 MHz Two-Way Radios
- Types of Radio Systems
- Two-Way Radio Transmission Types
- Narrowbanding
- FCC Licensing
- Family Radio Systems
- Itinerant vs Coordinated Licenses
- License-Free Two-Wayradios
Various frequencies exist for the operation of distinct two-way radio systems. “But hold on”, you may say, “I’m not sure what you mean by frequencies.” No worries, friends. Let's dive into what a frequency is. If you know this stuff already, feel free to skip ahead. Think of frequencies as waves in a pool of water. We start with a still pool, in wh...
UHF radios utilize a frequency band of 400 – 512 MHz. This frequency band is by far the most popular choice amongst two-way radio users.
These systems use frequency bands of 800 MHz (806 – 824 MHz& 851 – 869 MHz)and 900 MHz (896-901 & 935-940 MHz).
Your two-way radio system can use a few different methods of transmitting signals based on its programming. We will look at each in order of growing complexity. This section can be a bit dense, so frequent water breaks are recommended.
For over a century analog signals ruled the radio world, but the advancement of technology is once again changing things and radio is not immune to the digitization of the modern world. Even though most businesses and users still use analog systems today, the shift to digital systems is coming. A big driving force of this is that analog technology ...
Before 2013, everybody was using systems that operated with a bandwidth of 25KHz. This was far too large when factoring in the growing number of users vying for space in the radio spectrum, every day. The congestion caused by the large bandwidth is why the FCC mandated that all existing and future licensees implement equipment able to operate on ba...
The Federal Communications Commission, or FCC, is responsible for regulating the electromagnetic spectrum used by commercial and private users. They oversee optimizing the use of the spectrum for fair competition as the revolution in communication continues. Many personal radio users will find they can operate without specific licenses granted by t...
Family Radio Systems
As defined by the FCC, the Family Radio Service (FRS) is a private, two-way, short-distance voice and data communications service for facilitating family and group activities. Most FRS radio devices are the type you find on the shelves of stores like Walmart, Best Buy, and sporting good locations. These make up the majority of the amateur consumer market for two-way radios. The FCC has designated 22 channels for FRS use within the 462 – 467 MHz range it shares with GMRS. Since you share the s...
General Mobile Radio Systems
The FCCdefines GMRS as a licensed radio service that uses channels between 462 MHz and 467 MHz. The most common use of GMRS channels is for short-distance, two-way voice communications using hand-held radios, mobile radios, and repeater systems. GMRS operates under the same 462 – 467 MHz frequency band as FRS These systems are mainly licensed out to individuals who need to use radio systems which exceed the 2-watt power limit put on FRS devices, but there are some cases where small businesses...
Land Mobile Radio
Note: Radio Depotspecializes in this is the class of two way radio LMR services are generally much higher quality and more complex than its GMRS and FRS counterparts. Public land mobile radiosystems are to be used exclusively by public safety organizations (i.e. police, fire, and ambulance services), and use designated special frequencies reserved for the public safety sector by the FCC. Private land mobile radiosystems are designed for private commercial use and are utilized by businesses ra...
Itinerant Licenses
These licenses are for people who need their license agreements to travel with them. Think about an independent contractor working on multiple job sites throughout counties or even different states. Itinerant licenses provide you the ability of not having to reapply for license agreements for each location you work in. The FCC has set aside a list of frequencies for use by all itinerant licensees. This does mean there is a higher risk of communication interference due to the volume of users o...
Coordinated Licenses
To operate within the FCC's Public Land Mobile Radio Services (PLMR) band, Part 90 licensing is required. Public safety radios, paging devices, commercial radio systems, and radio location devices fall under this category. Coordinated licenses are essential for those operating in the FCC's business/industrial pool of frequencies, requiring entities to obtain a radio station license. Frequency coordinators, certified by the FCC, recommend suitable frequencies, and many opt for radio licensing...
Many of you will find you won’t have any need for products that require FCC licensing. Here is a list of some radios that can operate license-free, along with some details of each, giving you a sense of what’s available without having to apply for a license agreement. For more information on any of the products listed, click the link attached.
The HT is probably the most common ham radio type in existence, and while compact, it can provide excellent communications in many situations where a larger radio is impractical or unnecessary. The HT is perfect for voice communications over a range of a few miles when the operator is on foot, or simply when a more powerful radio is unnecessary for the desired communication.
Jan 20, 2022 · AT&T and T-Mobile used GSM. Most of the rest of the world used GSM. The global spread of GSM came about because in 1987, Europe mandated the technology by law, and because GSM comes from an ...
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Aug 1, 2020 · Many two-way radio users are working in mission critical environments where time and information are key. With digital radios, you can assign each radio with an alias and an ID #. You can use this information to make specific radio-radio only calls as well as relaying key personnel information in the case of an emergency via a dedicated button.
