Ham Radio General
PP, GMRS, Marine VHF, 900 MHz – we can use?
The General Mobile Radio Service and Family Radio Service handies relatively new 900MHz arrived on the scene, all are capable radios that can have the same goal: personal or business communication at close range. Marine VHF are different. More on marine VHF radio later.
The cheapest of the three short-range radios are personal Family Radio Service (FRS) handies. FRS radios are limited 500 megawatts, or half of one watt. Realistically, they are good for anything up to 1 mile depending on terrain. The FRS is handies free license, which is a great advantage. These handies with 14 channels available. CTCSS coding could reduce interference in large urban areas, but still have 14 channels. CTCSS does not add channels.
FRS was introduced by the FCC in 1996 as a cheap and license free communication of personal and professional use. Curiously, the only way you can now get a radio FRS again to buy new old stuff (NSA), no manufacturer builds a more FRS radio. Any new radio service sold by a combination of FRS and GMRS.
The General Mobile Radio Service (GMRS) handies are more expensive. They have higher performance, typically 1-4 watts, although some luxury handies allegedly GMRS increase the options for the power that gives them a maximum of 5 watts output. That is the limit you can leave the battery Walkie. If you think 5 watts of output is not right, think again! The vast majority handies amateur radio (HAM) also have a maximum power of 5 watts. More than that, and the batteries are exhausted very quickly during the show! The GMRS handies have a new set, but does not believe the truth about the 20, 28, 34 miles, etc.. In fact, you get about 10% of that. So if your hand GMRS reached 3.4 miles. Of course, if you're on a mountain or a lake in a boat, will be bigger, because there are no obstacles.
GMRS was introduced in the 1960s by the FCC. At that time, called the class of radio service to a citizen.
GMRS has a total of 22 channels. However, FRS and GMRS proportion of seven UHF channels, so your handie automatically switches to low power (500 mW) to transmit on some channels. As FRS, GMRS handies are also available with CTCSS encoding.
The handies GMRS requires an FCC license, which is not cheap at $ 85. However, you will be in violation federal law, if you operate a GMRS radio without a license.
The handies 900 MHz, which are relatively new to the market, use one watt output and a free license. They work with a technology called frequency hopping spread spectrum. This technology is similar to cell phones, but does not recall these handies using repeaters cell phone. The range of these handies is comparable to a GMRS 1-2 watts of power.
Marine VHF is strictly for marine use! If you do not have a boat, do not use these radios. The FCC has (and still) people fined for unauthorized use. What Just do a little research on the net and see! There is much information on page FCC website on the rules and regulations on marine VHF … they (Coast Guard) take any unauthorized use of these frequencies very seriously. Very recently, introduced a walkie-talkie a Cobra GMRS and so VHF marine frequencies. You can make a great addition to your water activities.
You can get one of these radios the superstore, Amazon, Ebay and many other sources. Expect to pay about $ 20 for handies down to plus $ 100 for premium models.
About the Author
I’ve been a licensed Amateur Radio Operator since 1978 and enjoy all facets of radio communication. Learn more about FRS, GMRS, and 900Mhz handie-talkies at http://frsgmrsradio.com/
Gordon West speaking at HOSARC general meeting1/15/08Part1
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