 Radio-Tone Duplex repeater controller KG-UVD1P PX-777 US $84.20 
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 Mini 20W UHF 6 Cavity Duplexer for Ham Radio Repeater US $77.90
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 UHF 6 CAVITY DUPLEXER for radio repeater BNC connector US $79.98
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 OPEK DU-500UF - VHF/UHF Indoor Ham Radio Duplexer US $39.99
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 UHF 6 CAVITY DUPLEXER for radio repeater N connector US $99.50
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 Radio-Tone Duplex repeater controller FD-150A US $85.00
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 6 cavity duplexer for radio repeater UHF FREE tune US $99.99
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 UHF 6 Cavity Duplexer for mobile radio repeater BNC US $77.50
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 Duplex Repeat Interface cable for Motorola Radio GM300 US $10.99
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 Small 20 W UHF 6 Cavity Duplexer for Ham Radio Repeater US $89.90
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 Radio-Tone Duplex repeater controller GP300 GP88S US $85.00
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 UHF 6 CAVITY DUPLEXER for Radio Repeater N Connector US $79.98
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 OPEK DU-500UM - VHF/UHF Indoor Duplexer for Ham Radio US $29.99
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 440mhz HAM RADIO KENWOOD TM 742A 741 REPEATER RF duplexer w/ BNC FREShp US $115.00
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 UHF 6 Cavity Duplexer for handheld portable radio repeater N connector FREE tune US $99.50
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 MX-72 ANTENNA & RADIO DUPLEXER 1.6-150MHZ 400-460MHZ US $41.59
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 Radio-Tone Full Duplex Cross Band Repeater Controller US $85.00
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 Duplex Repeater Interface for Motorola GM300 Radio NEW US $14.79
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 UHF 6 CAVITY DUPLEXER f/ radio repeater N connector 450 US $87.50
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 DX RADIO SYSTEMS UHF REPEATER 100 WATT 435 TO 470MHZ WITH 4 CAVITY DUPLEXER US $1,800.00
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 Duplexer WACOM BPBR 450-470 mhz for 2 way radio repeater. US $103.61
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 Radio-Tone Duplex repeater controller ICOM IC-V8 US $85.00
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 Radio-Tone Duplex repeater controller for PX-888 PX-777 US $85.00
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 UHF 6 Cavity DUPLEXER for radio repeater N connector US $100.40
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 Radio-Tone Duplex repeater controller Duplexer NEW US $85.00
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 2 Meter 440 Ham Radio Dual Band Antenna Duplexer US $40.00
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 MINI 20W UHF 6 CAVITY DUPLEXER FOR RADIO-TONE REPEATER US $109.00
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 One Pair RG-174 Cable Adaptor For Duplexer to Radio US $15.00
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 UHF 6 Cavity Duplexer for radio repeater +N connector US $99.50
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 UHF 6 CAVITY DUPLEXER for radio repeater N connector SQ US $99.50
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 mini 20W UHF 6 cavity duplexer for RADIO-TONE Repeater US $89.98
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 Radio-Tone Duplex repeater controller VX-170 FT-270 new US $85.00
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 Radio-Tone Duplex repeater controller FT-60R VX-160 new US $85.00
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 ARROW ANTENNA Ham radio Duplexer Inc..Split boom NEW @$ US $139.00
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 Radio-Tone Duplex repeater controller for KGUVD1P PX888 US $85.00
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 mini 20W VHF 6 cavity duplexer for radio transceiver + FREE tuning US $107.80
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 UHF 6 CAVITY DUPLEXER for radio repeater N connector FREE tuning US $109.99
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 UHF 6 CAVITY DUPLEXER for radio repeater BNC connector FREE tuning US $109.99
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 50W VHF 6 Cavity Duplexer for GM300 GM3188 GM338 radio N connector - FREE tuning US $109.99
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 50W VHF 6 Cavity Duplexer for GM300 GM3188 GM338 radio BNC connector FREE tuning US $109.99
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 50W UHF 6 Cavity Duplexer for 2 way ham mobile radio US $99.50
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 50W VHF 6 cavity duplexer for 2-way mobile ham radio US $87.50
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 50W VHF 6 Cavity Duplexer N for Radio Repeater SQ150-N US $117.60
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 mini 20 W UHF 6 cavity duplexer for RADIO-TONE Repeater US $107.80
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 UHF 6 cavity duplexer for radio repeater + FREE tune US $88.20
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 UNIDEN SPS8000ED Trucking duplex SMR portable radio NEW US $39.99
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 6 cavity duplexer for radio repeater UHF FREE tune US $98.00
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 50W VHF 6 cavity duplexer for radio repeater FREE tune US $87.50
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 Radio Decibel Duplexer Cavity Combiner 8 Cans 225-400 US $350.00
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 muRata GIGAHIL RF UHF 800MHz Band Duplexer DFY2R836CR881BSD Ham Radio Antenna US $50.00
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 50W UHF 6 CAVITY DUPLEXER radio repeater N connector US $87.50
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 UHF 6 CAVITY DUPLEXER for radio repeater N connector SQ + FREE tuning tune US $109.98
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 50W UHF 6 Cavity Duplexer N-connect for Radio Repeater US $79.98
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 Celwave duplexer MODEL 915.5 - 936.5 MHz NIB ORIGINAL BRAND NEW uhf RADIO US $33.99
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 Duplex Repeater Interface for Motorola Radio GM300 US $12.99
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 Radio-Tone Duplex repeater controller +DTMF KG-UVD1P US $85.00
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 Duplex Repeater Interface for Motorola Radio GM300 US $7.90
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 Duplex repeater Interface cable Motorola radio EM200 CDM1550 CM200 PM400 CM140 US $14.99
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 UHF 6 CAVITY DUPLEXER for radio repeater N FREE tuning US $87.50
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 Radio-Tone Duplex repeater DTMF controller for KG-UVD1P US $84.00
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 Radio-Tone Duplex repeater controller For KG-UV6D RT-FDR1 US $85.00
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 50W UHF 6 Cavity Duplexer Radio Repeater N connector US $79.98
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 50W VHF 6 Cavity Duplexer for Radio Repeater N connect US $99.50
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 Duplex Repeater Interface for Motorola Radio GM-300 US $10.99
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 50W UHF 6 CAVITY DUPLEXER for ham radio repeater BNC US $79.98
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 50W UHF 6 CAVITY DUPLEXER for radio repeater N adatper US $79.98
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Duplexer Radio
Tour of Rural Studio's 32K (aka 20K) Duplex House
Marine Radio: The New Age Revolutionary Communication Need for Defense Purposes
For those who have a science background, or an information technology background, if any one was to ask them what they knew about radio, they would sure shot use their technical jargon to define radio and sure shot confuse the hell out of the person who asked this question. The result might be that the questioner would have been left with a very confused state of mind. Let us make things simpler and easier to understand, so that you can understand the basics of radio workings for better understanding of things around us – it is shocking to see, but radio (some call it an outdated medium of communication) is all pervasive. The mobile phone we use, the phone system for answering bells, etc. are all examples of radio which we experience in our daily lives. This is because radio doesn't involve just way communication as people believe.
Radio is not just about listening to music on your favorite FM channel, but it is also used in various industries as well. Eg. The walky talkies used by personnel working in security organizations are nothing but radios with two way communication. The radio may allow simultaneous communication or may just allow one person speaking at one time (all this is done at two different frequencies), depending on the kind of a radio you have. There are VHF (Very High Frequency) radios used for defense purposes, for example the marine radio is VHF radio – which allow more distance coverage etc. But even they have variations for the purpose of usage – that is the same ship may have many different kinds of marine radios depending on the uses and the country stipulations and norms (because country safety is also involved here). For instance, in a ship a part of the ship, lets say the deck may use DSC (Digital Selective Calling) with a lower frequency for summoning the deckhand, and for communication with the coastal ports etc. the management could use a very VHF radio – simplex or duplex depending on the need.
Thus we see that as stated above, we see that Radio mostly involves frequencies. So basically radio performs the job of transmitting signals by modulating the electromagnetic waves with frequencies below the frequencies of visible light. These waves can be transformed into sound or anything else (depending on the device) once it collides with an electric device.
About the Author
Interested candidates or any amateur who want to establish their career as in boating and marine industry can enroll for Deckhand and Marine Radiocourses, vhf radio courses are available here.
Here are a list of other products on Radios AM Deals, come check these out:
