Radio Communications. Chapter 1 Introduction to Radio 

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Presentation transcript:

Radio Communications

Chapter 1 Introduction to Radio 

INTRODUCTION TO RADIO  Communications an important part of everyday life  Radio has revolutionised communication  The Air Cadet Organisation has its own nation wide system of radio stations  This Network uses High Frequency for long range

NETWORKS (NETS) The word network is used because

NETWORKS (NETS)  Directed (Controlled) Net  Free Net

NETWORKS (NETS)  Directed Net : Controlled by the Network Control Station (NCS)Controlled by the Network Control Station (NCS) A group of Stations using the same frequencyA group of Stations using the same frequency Always controlledAlways controlled You must ask Permission to join and leave the NetYou must ask Permission to join and leave the Net

NETWORKS (NETS)  Directed Net : The Network Control Station (NCS) Should:The Network Control Station (NCS) Should:  Have efficient equipment  Have experienced operators  Volume of radio communications to be passed

HF Base Station for Long Distance

NETWORKS (NETS)  Free Net No NCS (Network Control Station)No NCS (Network Control Station) No permissions requiredNo permissions required All Stations “Free” to contact each otherAll Stations “Free” to contact each other

Free Net NETWORKS (NETS) MRK 17 MRH 67 MRL 47 MRK 92

NETWORKS (NETS)  Directed Net To communicate with another Station You must have permission of the NCSYou must have permission of the NCS The NCS will do most of the communicating

Directed NETWORKS (NETS) MRK 17 MRK 92 MRL 47 MRH 67 MRV 92 NCS

NETWORKS (NETS)  Air Cadet Radio Nets Enable you to learn and practice proceduresEnable you to learn and practice procedures Techniques are based on Allied Military ProceduresTechniques are based on Allied Military Procedures Assist with our activities and safetyAssist with our activities and safety Do not use non-standard proceduresDo not use non-standard procedures

Radio Station  A Radio Station is the smallest part of a Net  It will have at least one radio set  The set will be able to transmit & receive  The set is known a a Transceiver

VHF Communications

Radio Station  Should use similar procedures for: High Frequency (HF) used for Long RangeHigh Frequency (HF) used for Long Range Very High & Ultra High Frequencies used for Short RangeVery High & Ultra High Frequencies used for Short Range  Directed Nets are more suited for HF

Radio Spectrum  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 Frequency  High Frequency  Very High Frequency  Ultra High Frequency

Radio Spectrum Medium(MF)High(HF) Very High (VHF) Ultra High (UHF)300Khzto3Mhz3MHzto 30Mhz 30Mhz30MHzto300MHz300MHzTo3GHz Long Range Short Range