Historically, amateur stations have rarely been allowed to operate on frequencies lower than the medium-wave broadcast band , but in recent times, as the historic users of these low frequencies have been vacating the spectrum, limited space has opened up to allow for new amateur radio allocations and special experimental operations. Since the 500 kHz band is no longer used for marine communications, some countries permit experimental amateur radio radiotelegraph operations in that band. The 2200-meter band is available for use in several countries, and the 2007 World Radiocommunication Conference (WRC-07) made it a world wide amateur allocation. ITU Region 1 edit.
G-TOR (Golay -TOR) is an FSK mode that offers a fast transfer rate compared to Pactor. It incorporates a data inter-leaving system that assists in minimizing the effects of atmospheric noise and has the ability to fix garbled data. G-TOR tries to perform all transmissions at 300 baud but drops to 200 baud if difficulties are encountered and finally to 100 baud. (The protocol that brought back those good photos of Saturn and Jupiter from the Voyager space shots was devised by M.Golay and now adapted for ham radio use.) GTOR is a proprietary mode developed by Kantronics.
RF diathermy is a medical treatment that uses RF induced heat as a form of physical or occupational therapy and in surgical procedures. It is commonly used for muscle relaxation. It is also a method of heating tissue electromagnetically for therapeutic purposes in medicine. Diathermy is used in physical therapy and occupational therapy to deliver moderate heat directly to pathologic lesions in the deeper tissues of the body. Surgically, the extreme heat that can be produced by diathermy may be used to destroy neoplasms , warts , and infected tissues , and to cauterize blood vessels to prevent excessive bleeding.
GUARD – All military aircraft monitor 243.0, which is known as “Guard.” This enables any military aircraft to communicate with another military aircraft even though they may be operating on different frequencies. Very handy during emergencies or confusion. Enemy aircraft may also use this frequency to prevent an unnecessary engagement if someone strays into the wrong territory. A downed pilot can use it to hail a passing aircraft. The guard receiver is a separate piece of equipment, and anyone transmitting on this frequency uses the words “on guard” when identifying themselves. (ELT)
Most genres of music have territorial fans, but few are as “I heard of them before you” as metal. Both an admirable yet irritating trait, metal fans have a keen ability to latch onto even the most grainy, basement-recorded, three-song EP because it features the drummer of That One Band and the vocalist of Those One Dudes. Therefore, the definition of “under the radar” has to be played pretty fast and loose as every metal fan will have their own idea of who is the biggest and best, and it often has little to do with album sales or arena shows.
If you’re new to shortwave, please take some time to learn the basics outlined below. To successfully listen to shortwave stations you must know how to find them. They are found in the shortwave bands. If you’re an experienced shortwave listener, you’ll know what bands are and how to use them, but if you’re new, you’ll need to learn about bands first. After that you will have excellent success. Please read on. If the bands it has are the bands you need, you’re fine. What model is it, and what carrier do you want to use it on?
We get a lot of bands asking how they can submit their music for possible airplay on the Underground Garage? So we have decided to streamline and make the submission process as easy as possible. Click here for more info on how to submit your bands music for airplay. The use of ISM equipment generates electromagnetic interference that interrupts radio communications that make use of the same frequency. Therefore, this equipment was restricted to specific frequency bands. Generally, the communication equipment that operates in these bands should tolerate the interference created by ISM equipment, and therefore users do not have any regulatory protection from the use of ISM equipment.
Colored leg bands can be coordinated internationally between the United States and Canada, or only locally depending on the species. Colored leg bands on waterfowl are usually hard plastic with etched codes that are coordinated much like collars, but are smaller and less visible on the bird. Peregrine Falcons and Eagles also have colored leg bands with engraved codes. m – 10 m Shortwave broadcasts, citizens’ band radio , amateur radio and over-the-horizon aviation communications, RFID , Over-the-horizon radar , Automatic link establishment (ALE) / Near Vertical Incidence Skywave (NVIS) radio communications, Marine and mobile radio telephony Very high frequency VHF 8 30-300 MHz
In the same way, AM radio is confined to a band from 535 kilohertz to 1,700 kilohertz (kilo meaning “thousands,” so 535,000 to 1,700,000 cycles per second). So an AM (amplitude modulated) radio station that says, “This is AM 680 WPTF” means that the radio station is broadcasting an AM radio signal at 680 kilohertz and its FCC-assigned call letters are WPTF. Bring up this page to study a table of the entire electromagnetic spectrum. The table shows frequency and wavelength, common names such as “light” and “gamma rays,” size examples, and any attenuation effects in Earth’s environment as discussed below. Atmospheric Transparency