Radio Radio Communications Communications
Jan 18, 2016
Radio Radio CommunicatioCommunicatio
nsns
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