Radio Radio CommunicatioCommunicatio

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ChapterChapter 1 1

Introduction to RadioIntroduction to Radio

INTRODUCTION TO INTRODUCTION TO RADIORADIO

Communications an important part of everyday Communications an important part of everyday lifelife

Radio has revolutionised communication Radio has revolutionised communication

The Air Cadet Organisation has its own nation The Air Cadet Organisation has its own nation wide system of radio stations wide system of radio stations

This Network uses High Frequency for long This Network uses High Frequency for long rangerange

NETWORKS (NETS)NETWORKS (NETS)

The word network is used because

NETWORKS (NETS)NETWORKS (NETS) Directed (Controlled) NetDirected (Controlled) Net

Free NetFree Net

NETWORKS (NETS)NETWORKS (NETS) Directed Net :Directed Net :

• Controlled by the Network Control Station Controlled by the Network Control Station (NCS)(NCS)

• A group of Stations using the same A group of Stations using the same frequencyfrequency

• Always controlledAlways controlled

• You must ask Permission to join and leave You must ask Permission to join and leave the Netthe Net

NETWORKS (NETS)NETWORKS (NETS)

Directed Net :Directed Net :• The Network Control Station (NCS) The Network Control Station (NCS)

Should:Should:

Have efficient equipmentHave efficient equipment

Have experienced operatorsHave experienced operators

Volume of radio communications to be Volume of radio communications to be passedpassed

HF Base Station for Long DistanceHF Base Station for Long Distance

NETWORKS (NETS)NETWORKS (NETS)

Free NetFree Net

• No NCS (Network Control Station)No NCS (Network Control Station)• No permissions requiredNo permissions required• All Stations “Free” to contact each All Stations “Free” to contact each

otherother

Free NetFree Net

NETWORKS (NETS)NETWORKS (NETS)

MRK 17MRK 17

MRH 67MRH 67MRL 47MRL 47

MRK 92MRK 92

NETWORKS (NETS)NETWORKS (NETS)

Directed NetDirected Net

To communicate with another StationTo communicate with another Station

• You must have permission of the NCSYou must have permission of the NCS

The NCS will do most of the The NCS will do most of the communicating communicating

DirectedDirected

NETWORKS (NETS)NETWORKS (NETS)

MRK 17MRK 17 MRK 92MRK 92

MRL 47MRL 47 MRH 67MRH 67

MRV 92MRV 92NCSNCS

NETWORKS (NETS)NETWORKS (NETS)

Air Cadet Radio NetsAir Cadet Radio Nets

• Enable you to learn and practice Enable you to learn and practice proceduresprocedures

• Techniques are based on Allied Military Techniques are based on Allied Military ProceduresProcedures

• Assist with our activities and safetyAssist with our activities and safety

• Do not use non-standard proceduresDo not use non-standard procedures

Radio StationRadio Station

A Radio Station is the smallest part A Radio Station is the smallest part of a Netof a Net

It will have at least one radio setIt will have at least one radio set

The set will be able to transmit & The set will be able to transmit & receivereceive

The set is known a a TransceiverThe set is known a a Transceiver

VHF CommunicationsVHF Communications

Radio StationRadio Station

Should use similar procedures for:Should use similar procedures for:

• High Frequency (HF) used for Long High Frequency (HF) used for Long RangeRange

• Very High & Ultra High Frequencies used Very High & Ultra High Frequencies used for Short Rangefor Short Range

Directed Nets are more suited for HFDirected Nets are more suited for HF

Radio SpectrumRadio Spectrum

Air Cadet Frequencies are:Air Cadet Frequencies are:• Assigned by the Ministry of DefenceAssigned by the Ministry of Defence

• Are in the following bands:Are in the following bands: Medium FrequencyMedium Frequency High FrequencyHigh Frequency Very High FrequencyVery High Frequency Ultra High FrequencyUltra High Frequency

Radio SpectrumRadio Spectrum

MediuMediumm

(MF)(MF)

HighHigh

(HF)(HF)Very HighVery High

(VHF)(VHF)Ultra HighUltra High

(UHF)(UHF)

300Khz300Khz

toto

3Mhz3Mhz

3MHz3MHz

toto

30Mhz30Mhz

30MHz30MHz

toto

300MHz300MHz

300MHz300MHz

ToTo

3GHz3GHz

Long Range Short Range