VHF Communication Basics Part 3

Communication Basics Part 3

VHF Radio and Introduction to icom VHF 5061Radio

Prepared by: Ahmad Sajjad Safi, ACAI-CNS Instructor

Introduction to VHF Radio

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What is VHF: Very high frequency (VHF) is the ITU designation for the range of radio waves from 30 MHz to 300 MHz with wavelengths of ten to one meters.Common uses for VHF are FM radio broadcasting, television broadcasting, two way land mobile radio systems (emergency, business, private use and military), long range data communication up to several tens of kilometres with radio modems, amateur radio, and marine communications.Airband or Aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation ( Ground to Air and Air to Air communication). 118–137 MHz: Airband for air traffic control with amplitude modulation.Different sections of the band are used for radionavigational aids and air traffic control.


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Propagation characteristics: VHF propagation characteristics are suited for short-distance terrestrial communication, with a range generally somewhat farther than line-of-sight from the transmitter.VHF waves are restricted to the local radio horizon less than 100 miles.VHF is less affected by atmospheric noise and interference from electrical equipment than lower frequencies.While it is blocked by land features such as hills and mountains, it is less affected by buildings and can be received indoors.Unlike HF, the ionosphere does not usually reflect VHF waves.


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Antenna: VHF is the first band at which wavelengths are small enough to make efficient transmitting antennas for two way radios in vehicles, aircraft, and handheld transceivers and walkie talkies.Portable radios usually use rubber ducky antennas, while base stations usually use larger fiberglass whips or collinear arrays of vertical dipoles.


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Antenna: A vertical, slightly bend backwards quarter wave rod placed on top or on the bottom of the aircraft for reception and transmission.As the location of the receiving station is not always the same or known, the signal must be send in all directions (Omni) with a vertical polarization (upright, vertical antenna).


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VHF Uses: VHF communication systems are employed largely for controlling air traffic.These systems are installed in all types of aircraft so the pilot may be given information and directions and may request information from air traffic control centers, control towers, and flight service stations.On the approach to any airport with two-way radio facilities, the pilot of an aircraft calls the tower and requests information and landing instructions.In airline operations and all instrument flights, the flight of an aircraft is continuously monitored by air traffic control (ATC), and the aircraft's crew is given instructions as necessary to maintain conditions of safe flight.

Introduction to VHF icom 5061 Radio

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VHF System Introduction: Ground and onboard VHF communication systems consists of a VHF transceiver, control head and antenna.VHF communication transmitters provide AM voice communication transmission between aircraft and ground stations or between aircraft.The VHF transceiver is a solid-state or digital system that can receive or transmit on any one of the 720 channels in the COMM range of frequencies.The frequencies are spaced at 25-kHz intervals throughout the range.Frequencies are selected simultaneously for both the receiver and the transmitter by rotating the frequency selector knobs.


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The IC-F5061 series is ideal for ground to air, public safety, business & industry, transportation and delivery service users. It offers advanced multi-mode operation, improved scanning and flexible installation that is suitable for mobile and base stations.


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How to reach the operation?Connect the Icom to PC, install the driver, program and specify the channels , mount the antenna and then enjoy the operation.


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Icom Modes: PTT ID, selective call (Selcall) and emergency call features are available with the Icom.The PTT ID function sends your unit ID number when you push (or release) the PTT button. The received ID number can be decoded as a user name.Selective calling enables you to call individuals or groups, depending on your needs.The emergency call feature allows you to send and repeat an emergency message to dispatch until the dispatch responds to it. In these situations, the radio can transmit anything the microphone hears and the dispatcher can monitor the background sounds.Radio check, status, message, radio stun/revive and call log features are also available.


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Icom air slats: IDAS system digital mode: IDAS (Icom Digital Advanced System) is Icom’s digital land mobile radio system using the NXDN™ common air interface for connecting ground to air communication.


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Detachable front panel With the optional remote control kit and separation cable, the front panel of the radio can be detached from the main unit. It allows for flexible installation even in limited installation space. Wide frequency range and large channel capacity covers a wide frequency range in one version. The 512 memory channel capacity with 128 zones allows you to divide and store a variety of flexible channel groupings.Built-in inversion-type voice scrambler provides secure conversation. Dot matrix, multi-function LCD With a high contrast dot matrix display, upper and lower case characters can be easily distinguished. Basic LTR™/Conventional mode operation Group, selective, and phone calls are all available in LTR™ mode. Get efficient operation without the need for any optional module.


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D-sub accessory connector The IC-F5061 series has a D-SUB 25 pin ACC connector for connecting various external devices.

Multiple 2-Tone, 5-Tone signaling The built-in 2-Tone and 5-Tone capabilities allows you to send a tone code with your call and decode multiple tone codes on a channel.Front mounted speaker 4 watts (typ.) front mounted speaker delivers clear and loud audio. The built-in audio compander improves the signal to noise ratio.Voting mode scan The voting scan detects the signal strength level of repeater sites and automatically selects the strongest station or the first station to exceed the preset signal level. This is useful for roaming between 2 or more repeater sites.


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Dust-protection and splash resistance: front panel are resistant to shock and vibration. When used with the optional separation kit, the remote control head has dust-protection and splash resistant construction.Enhanced scanning While scanning, you can program which Tx channel you want when you press PTT button. Start channel, last detected channel, priority or a preprogrammed channel are selectable. In addition, the nuisance delete function temporary removes a busy channel from the scanning list.Operating Temp. range : –30°C to +60°CPower supply requirement : 13.6V DC nominalCurrent drain : Tx 50W 14.0A ,Rx Max. audio 1200mA


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Supplied Accessories• Hand microphone, HM-148 • DC power cable• Microphone hanger • Mounting bracket kit


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Any Question?

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VHF Communication Basics Part 3