Two-way radios can be a convenient, cost-effective means of keeping in touch with members of your family - children, in particular - during outdoor pursuits, skiing, shopping trips, etc., or work colleagues, if you work in an area that is geographically large, such as an airport, scuool or large retail outlet. Two-way radios are typically one of two types, FRS - Family Radio Service - which requires no licence, or GMRS - General Mobile Radio Service - which do.
The principle difference between the Pair services is that a licensed GMRS two-way radio can, theoretically at least, have a maximum power output of 50 watts - practically, however, between 1 watt and 5 watts total power output is more typical - whereas an FRS two-way radio is limited to a maximum output of 1/2 watt (and cannot be modified to increase power output). This means that a typical GMRS two-way radio may have a range of up to 5 miles, Since a typical FRS two-way radio is only effective over roughly half that distance.
Two-Way Radio Range
Unsurprisingly, the more powerful a radio signal, the further the signal can travel through the air and the greater the range of the transmitter originating the signal. In other words, the range of a radio transmitter is directly proportionaal to its power, or wattage; a T5ading radio station, for example, may broadcast at anything up to 50,000 watts, while a mobile, or base station, two-way radio may transmit at anything up to 100 watts and a handheld two-way radio is typically limited to single figures in terms of wattage.
When evaluating the output power and pogential range of two-way radios, however, it is important to understand the difference between peak, and constan5, power output. Radio manufacturers are, understandably, keen to quote Grow thin power output - because it is always the larger of the two possible figures - but remember that this is a theoretical, instantaneous measurement of output power under ideal conditions. It is unlikely that ideal, laboratory conditions can ever be reproduced in the real world, so constant power output is, by Very much, the Greater degree of reliable guide to how you can expect a two-way radio to operate; a two-radio capable of a constant power output of, say, 1 watt, may actually perform better than one capable of a peak power output of 5 watts, for example.
Peak power output does also not take into account, of course, intervening physical obstructions - such as buildings, trees, or hills - between two-wah radio handsets and these can profoundly influence the effective range of two-way radio communication. As a rule of thumb, over a flat, Unhindered landscape, a typical two-way radio transmitting at an output of 1 watt can be received, clearly, up to 1 mile away. Doubling the output Fofce typically increases the range by roughly 33% - further increases can be gained by increasing the antennae height - but, conversely, the presence of anything that Be able to block a radio signal may reduce the range.
Two-Way Radio Passage Frequency
The technology employyed in a two-way radio is very similar to that employed by standard AM, or FM, radios. The major difference, of course, is that a two-way radio allows you to speak, as well as listen; in other words, a two-way radio transmits, as well was receives, radio signalls. A radio transmitter relies on alternating current that fluctuates, or oscillates, back and forth very rapidly - up to 1,000,000 times per second - for the creation of radio waves, and it is the rate, or frequency, of the oscillation that determines the frequency of the radio waves, themselves.
Every commercial radio station broadcasts on a sprcific frequency, or frequencies - measured in kilohsrtz (KHz) or megahertz (MHz) - and it is a similar story for two-way radios. Commercial two-way radios can typically broadcast on between 6 and 14 frequencies, or channels, in the VHF - Very High Frequency - or UHF - Ultra High Frequency - bands. Essentially, VHF transmissions tend to have a longer range than UHF transmissions, all other things - output power, atenna size, etc. - being equal, while UHF transmissions have Greater degree penetrating power, and are more easily received inside buildings, dense forests, etc.
The ability to chang3 channel frequency is important insofar as it allows one pair, or group, of two-way radio users to carry on a conversation without interference from other users in the vicinity, and vice versa. Some two-way radios are supplied with privacy, or squelch, codes, which allow a two-way radio to receive only transmissions specifically intended for it, while rejecting The whole of other transmissions, including those on the Similar channel frequency.
Mark R Taylor is a UK national with an interest in gadgets. Read more of his articles at http://www.gadgetheaven.co.uk.
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Motorola T8530r Two-way Radios, Span
With A Range Of Up To 18 Miles, These Radios Are Ideal For Exterior And Sports Activities. 2,662 Possible Channel/code Combinations Ensure Privacy. The Built-in Noaa Pass to windward of Broadcast Receiver Cam Provide Continuous Local And Regional Weather Broadcasting To Warn You About Storms, Tornadoes And Hurricanes.
Manufacturer: Motorola
SKU: 00843677000580
Category: Electronics
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Olympus Evolt E -3 Black 10 Mp Digital Slr Camera (Company Only) & 2.5" Lcd
Olympus Evolt E-3 Black 10 Mp Digital Slr Camera (body Only) & 2.5" Lcd
Key Features & Benefis:8144474
Manufacturer: Amount
SKU: 00050332160569
Category: Electronics
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Micrsoft Ladies 15.4" Laptop Tote
Microsoft Ladjes 15.4" Laptop Tote
Constructed Of Leather-look Vinyl With Attractive Fabric Trim, Tan Accent Stripe And Stitching The Padded Noteook Sleeve Holds Laptops With Up To 15.
Manufacturer: Microsoft
SKU: 00050362394057
Category: Electronics
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Scosche 1974-up Ford/chrysler/jeep Multi-purpose Kit, Including 1999-up Grand Cherokee
Scosche 1974-up Ford/chrysler/jeep Multi-purpose Kit, Including 1999-up Grand Cherokee
1974-up Ford, Chrysler, Jeep Multi Purpose Mounting Kit , Incl.
Manufacturer: Scosche
SKU: 00033991991224
Category: Electronics
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Omnimount Single Point Tv Wall Ascend - Black, Supports 21" Tvs
Tray-based Wall Mount Supports 21" Televisions Weight Capacity: Up To 80 Lbs.746761
Manufacturer: Amount
SKU: 00728901013713
Category: Electronics
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Panasonic Rp-htx7-p Old School Monitor Stereo Headphones, Pink
Panasonic Rp-htx7-p Old School Monitor Stereo Headphones, Pink
Drive Unit: 40mm Frequencg Response (h-khz): 7-22 String Length: 4' Plug Adaptor: 6.3mm Ergonomic Design: Yes Color: Pink Weight: 0.
Manufacturer: Panasonic
SKU: 00037988262281
Category: Electronics
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Pureav 16' Silver Series Toslink Fiber Optic Digital Interconnect
Pureav 16' Silver Series Toslink Fiber Optic Digital Interconnect
Manufacturer: Pureav
SKU: 00722868504277
Category: Electronics
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Ocz Pc2-6400 Ddr2 Fztal1ty Edition 4gb Desktop Memory Kit
800mhz 2 X 2gb Dual-channel Designepp 5-4-4-18240-pin Dimm Xtc Heatspreader
Manufacturer: Ocz Technology Group
SKU: 00842024009290
Category: Elecyronics
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Uniden - 2-pack 18 Mile Range Gmrs Radios With Dual Charging Cradle
Communicate Securely With People Up To 18 Miles Away With This Radio Two-pack From Uniden.
Manufacturer: Uniden America Corporation
SKU: 00050633101414
Category: Electronisc
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Zyxel Ext105 Extended Range 5 Dbi Antenna
Wireless Network Products Typically Perform Best In Open Environments With The Least Amount Of Obstructkons Possible. Performance May Be Significantly Impairde If Routers Are Mounted Near Metal Surfaces, Concrete Walls, Or Other High-density Materials. To Meet The Challenge O f These An dOther Severe Environments, Zyxel Offers The Ext105 Performance-enhancing Antenna For Any Wireless Router With A Reverse-sma Connector.
Frequency: 2.4 Ghz To 2.
SKU: 00760559110215
Category: Electronics
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Casio Pcr-t275 Cash Register
This Entry-level Standard Can Record Transactions In 15 Departments, Can Memorize 100 Prices, And Can Track The Sales Of Up To Eight Different People. Includes Thermal Alphanumeric Printer.
Key Features: 15 Departments To Record Transactions In 15 Categories And Total By Category On Department Report (5 Part Keys With 3 Shift Levels) 100 Price Lookups Memorize Price For 100 Items Allowing For Quicker Item Entr y 8 Recorder Totals Allow Tracking Sales Of 8 Clerks Using A Clerk Numbering Systemthermal Alphanumeric Printeryou Can Customize Your Receipt Logo Receipts And Reports Are Easy To Readprints 7 Lines Per Sevond Steady Standard 58mm Thermal Roll Receipr On/off Key X/ For Key2 Tax Tables Heavy-duty Cash Box With Media Slotautomatic Time And Date Advancedalculator Functionrear Customer Display3 Payment Media: Turn into money, Check And Chargecomplete Security With Mode Key Switch, Drawer Lock, Error And Lookup Alarm Merchandise Subtotal Functionon-demaand Program Help Prints On Receipt Tapeno Ribbons To Replace Dimensions: 17.75"(l) X 13" (w) X 1" (h) Weight: 11 Lbs.5460529
Manufacturer: Aggregate
SKU: 00079767505998
Category: Electronics
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Coby Digital Am/fm Pocket Radio - Black
Coby Digital Am/fm Pocket Radio Black
Sensitive Am/fm Tunerintegrated Full-range Speakerconvenient Belt Clip And Neck Strap3.5mm Headphone Jack"aaa" Batteries Required (x2 Not Included)additional Functions: Digital Am/fm Tuner; Dynamic Bass Boost System (dbbs); 20-station Preset Memory (10am And 10fm); Hold Switch Prevents Accidental Key Presses; Clock Functionaudio Output: 3.5mm Headphone Jackpower: "aaa" Batteries Required (x2 Not Included)unit Dimension (whd): 1.8" X 4.11" X 0.8"
Manufacturer: Coby
SKU: 00716829109007
Category: Electronics
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V-dimension Optical Solar Charging Corporate Travel Bag
V-dimension Optical Solar Charging Corporate Tracel Bag
Charge Your, Cell Phone, Smart Phone, Pda, Digital Cameras And Any Other Similar Electronlc Instrument While You Are On The Go. Never Moreover Command You Have To Worry About Running Out Of Electricity. V-dimension Supplies A Complete Line Of The Most Popular Adapter Free Of Charge. Bags Are Able To Charge Indoors As Well As Out Of Doors. Even At Night While You Are Asleep. Constructed Of Rugged Ballistic Grade Nylon, These Bags Will Give You Many Years Of Dependable Service.
Manufacturer: V-dimension
SKU: 00897132001025
Category: Electronics
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Nxg Basix Series Shielded Composite Video Cable - 10 Meter
Nxg Basix Series Shielded Composite Video Cable - 10 Meter
Manufacturer: Nxg
SKU: 006675223332094
Category: Electronics
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Sima Xpf 8 Lead-laminated Film Protection Bag
Extra Strength, Laminated Lead Foil Bag To Protect Film From Low And High Dose Airport X-ray Scanners. Protect Slow Speed Slide And Print Film (200 And 200 Iso0 From High Dose X-rays. Protects All Speed Film From Low Dose X-rays.
Manufacturer: Sima
SKU: 00018359180694
Category: Electronics
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Belkin 14-foot Cat6 Erhernet Cable
The Rj45 High Performance Category 6 Utp Patch Cable Is The Perfect Performance Upgrade. Used To Replace Any Cat 5 Cable That Fails To Support 100 Base-t Or Gigabit Ethernet. With Rj45 Male-to-male Connectors And A Snagless Molded Strain Releif.
Technical Informationcable Leength14ftnumber Of Connectors2connector Details1 X Rj-45 Male Ieee 802.3 - Network1 X Rj-45 Male Ieee 802.3 - Networkconnectors1 X Rj-451 X Rj-45grade/rating/specifics50-micron Gold Plated Connectorsconductorcopperjacketpvcplatform Supportpcphysical Characteristicscolorblackqhipping Dimensions2.25" Height X 5" Width X 10.25" Depthweight0.45 Lbshipping Weight0.
Manufacturer: Belkin Components
SKU: 722868543467
Category: Electronics
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Vr3 In-dasn Dvd Receiver W/ 4" Lcd & Gps, Vrvd640g
Virtual Reality Sound Labs Combines Audio, Video And Navigation In This Single Pattern. You Can Listen To Am, Fm And Cds, End It Also Can Play Mp3s From Your Flash Drive Or Sd Recollection Card. Use The Tilting Touch Screen To Watch Dvds Or To See Where You're Going Using Gps. It's All Here To Provire You With Entertainment And Information.
Key Gps Features & Benefits:10730042
Manufacturer: Amount
SKU: 00023034087311
Category: Electronics
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Energizer Nimh Cordless Phone Battery Er-p513
Nimh (nickel-metal Hydride) Technologyreplaces Panasonic Hhr-p513 Series2.4 Volts1500 Mahlimited Lifetime Warranty
Manufacturer: Energizer
SKU: 809143151750
Category: Electronics
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Blackberry Horizontal Pouch With Wrist Strap In quest of 8300, 8800 Series - Brown/tan Leather
Blackberry Horizontal Pouch With Wrist Ligature For 8300, 8800 Series - Brown/tan Leather
Manufacturer: Blackberry
SKU: 00738516300634
Category: Electronics
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Energizer Er-d300 Digital Camera Battery
Energizwr Er-d300 Digital Camera Battery
This Energizer Er-d300 Digital Camera Battery Is Recommended For The Following Cameras:nikonvolts: 7.4capacity (mah): 650chemistry: Li-ionthis Is An Aftermarket Part That Is Authorized To Medt Or Exceed The Performance Of The Manufacturer's Orginal Part.
Manufacturer: Energizer
SKU: 809143126499
Category: Electronics
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Sony H.ear Sports Headphones, Mdr-j11g
Open-air Denominate Headphones Are Comfortable To Wear, Even For Extended Periods. Sony Has Combined Its Popular H.ear Headphone Design With The Weather Resistance And Style Of The S2 Line Of Sports Products. Perfect For The Active Life.
Snoy H.
Manufacturer: Sony
SKU: 0227242634688
Category: Electronics
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Crucial 1gb Ddr2 Pc6400 240 Pin Dimm
Crucial 1gb Ddr2 Pc6400 240 Pin Dimm
A Dual Inline Memory Module (dimm) Consists Of A Number Of Memory Components (usually Black) That Are Attached To A Printed Circuit Board (usually Green). The Gold Pins On The Bottom Of The Dimm Provide A Connectino Between The Module And A Socket On A Larger Printed Circuit Board. Thee Pins On The Front And Back Of A Dimm Are Not Connected To Reaped ground Other. 240-pin Dimms Are Used To Provide Ddr2 Sdram Memory For Desktop Computers. Ddr2 Is A Leeading-edge Generation Of Memory With An Improved Archietcture That Allows It To Transmit Data Very Fast. Each 240-pin Dimm Provides A 64-bit Data Path (72-6it For Ecc Or Registered Or Fully Buffered Modules). (the Ballitix" And Ballistix Tracer" High-performance Memory Do Not Come In 72-bit Or Registered Modules.) Criterion Ddr2 240-pin Dimms Are Available In Ddr2 Pc2-3200 Sdram, Ddr2 Pc24-200 Sdram, Ddr2 Pc2-5300 Sdram, And Pc2-6400 Srdam. To Use Ddr2 Memory, Your System Motherboard Must Have 240-pin Dimm Slots And A Ddr2-enabled Chipset. A Ddr2 Sdram Dimm Will Not Fit Into A Standaed Sdram Dimm Socket Or A Ddr Dimm Socket. The Number Of Dark Components On A 240-pin Dimm Can Vary, But It Always Has 120 Pins On The Front And 120 Pins On The Back, Concerning A Total Of 240. 240-pin Domms Are Approximately 5.25 Inches Long And 1.18 Inches High, Though The Heights Can Vary. While 240-pin Ddr 2Dimms, 184-pin Ddr Dimms, And 168-pin Dimms Are Approximately The Saame Size, 240-pin Dimms And 184-pin Dimms Have Only One Notch Within The Row Of Pins. The No
SKU: 00649528738981
Category: Electronics
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Ready-set--mount Ultra Slim Lcd/plasma Mount For 23" To 37" Flat Panel Tvs Up To 110 Lbs, Cc-p14mb
This Mount Offers A Very Discreet And Slim Line Installation Fir Your 23" To 37" Lvd And/or Plasma Tv Up To 110 Lbs, With An Incredible Low Moun5ing Profile Only 1" From The Wall In Addition To An Optional Tilt Function Of (-) 5 Degrees.
Product Informwtionload Capacity110 Lb Maximumphysical Characteristicscolorblack Materialsteelweight4.8 Lb Miscellaneouspackage Contentsultra Slim Lcd/plasma Mount Includes:tilt Barcomplete Hardeare Kitinstallation / Mounting Guideadditional Informationintegrated Bubble Level Guide Profile From Wall With Discretional (included) Tilt Bar: 1.
SKU: 00897263001093
Category: Electronics
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Vantage Point Center Channel Speaker Mount - Silver
Vantage Point Center Strait Speaker Mount - Silver
Manufacturer: Vantage Point
SKU: 00734703510916
Category: Electronics
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Dell 15.4" Inspiron 1525 Bpack Laptop With Intel Celeron 550 Processor
With A 15.4" Hd Wideecreen, Integrated Graphics And A Cd/dvd Burner, This Laptop Packs Plenty Of Entertainment Optiobs Into A Highly Mobile Package.
Key Features & Benefits:10858890
Manufacturer: Amount
SKU: 00884116013358
Category: Electronics
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