Since Commercial Cellular Phones Were First Introduced In 1982
Since commercial cellular phones were first introduced in 1982
, some one has been trying to improve service in areas where the signals were weak. The original car phones operated at 3 watts and used external antennas. As handheld phones were introduced, they were limited to .6 watts, and range suffered correspondingly. Each generation of digital cellphones have operated on less power, as the cellular systems have increased in density, power requirements are less and battery life has become far more practical.
Some early boosters were manufactured by the phone manufacturers themselves, and plugged physically plugged into the portable cellphones. Motorola, NEC, and Mitsubishi Diamond Tel all produced such units. Several aftermarket companies entered the market, with a variety of plug in (direct connect) amplifiers as well as rebroadcasting units in the 800 mHz range.
Many of manufacturer have come and gone since, some have been fairly successful, but the technology of these booster amplifiers has not advanced very much since their initial introduction. With the introduction of the PCS (1900 mHz) bands, many manufacturers have introduced dual band amplifiers to cover both the traditional cellular and PCS frequencies. The industry has generally gone unregulated other than power output limitations until just recently.
A few of the cellular providers such as Verizon and AT Wireless, have petitioned the FCC to regulate or even ban completely the manufacturing and sales of cellular boosters. Several interference issues can be created by poorly designed amplifiers, including causing dropped calls to the complete shut down of entire cell sites.
The FCC has instituted some new rule making and is likely to adopt new PTCRB standards. Under pressure from several cellular providers they have tightened testing and specification requirements to an almost impossible standard. As of this writing, there has only been one amplifier that has made it through these latest standards to be approved by the FCC, the new Maximum Signal series of amplifiers.
These booster amps are much advanced from the original boosters, they weigh just a few ounces, are encased in plastic rather than the heavy metal heat sink housings used by most other manufacturers. They give off little or no heat, and require less than one-third of the power that the old metal chassis amplifiers draw. This makes them especially useful in applications such as a solar installation, or where generated heat can damage components such as in a remote camera installation.
The present line up of Maximum Signal amplifiers includes three dual band variations. The Traveller, designed for installation in a car or light truck, uses a Magnetic Mount external antenna and a small panel antenna for inside the vehicle. The Bus or RV kit utilizes a Super Trucker antenna mounted outside, and a "salt shaker" antenna to cover inside the coach. The Sphere kit is utilized in a home or office environment and can cover an area approximately 50 feet in diameter, and can be expanded to a total of four inside antennas each covering a footprint that large. All of the Maximum Signal kits can manage eight connections simultaneously, they can be cellphones or data modems.
Expected sometime mid 2011 is a direct connect variant of the Maximum Signal amplifier, which will connect directly a phone or cellular data card. Towards years end a quad band version is expected that will cover the Wimax (2.5 mHz) band and also the new 700 mHz LTE mobile broadband service from Verizon. The new LTE sevice is being launched in many markets on 700 mHz, and in some markets on the 800 or 1900 mHz frequencies which are already supported by the dual band amplifiers.
The FCC is expected to act sometime in 2011, their action could go as far as a complete ban on the sale and manufacture of the older style amplifiers, or require extensive testing of new and existing models.
by: YAAHOO
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