View
224
Download
0
Tags:
Embed Size (px)
Citation preview
Frequency Spectrum , Frequency Spectrum , Antennas, and Amateur Antennas, and Amateur
RadioRadio
Troy RankTroy Rank
Frequency spectrumFrequency spectrum
Focus On:Focus On:• HF – High FrequencyHF – High Frequency• VHF – Very High FrequencyVHF – Very High Frequency• UHF – Ultra High FrequencyUHF – Ultra High Frequency• Lower Microwave FrequenciesLower Microwave Frequencies
HF HF
Frequency RangeFrequency Range• 3-30MHz3-30MHz
Who Uses HF?Who Uses HF?• MilitaryMilitary• MarineMarine• AeronauticalAeronautical• Radio AmateursRadio Amateurs• World Band RadioWorld Band Radio
HF - ModesHF - Modes
Analog ModesAnalog Modes• AM, USB, LSB, CW AM, USB, LSB, CW
Digital ModesDigital Modes• SSTV (slow scan tv)SSTV (slow scan tv)• Amtor / PactorAmtor / Pactor• RTTYRTTY• PSK31PSK31• WeFaxWeFax• BPL?BPL?
VHF/ UHFVHF/ UHF
VHF 30-300 MHzVHF 30-300 MHz UHF 300MHz - 3 GHZUHF 300MHz - 3 GHZ Short Range Short Range No Ionospheric propagationNo Ionospheric propagation Who uses VHF/UHFWho uses VHF/UHF
• Who Doesn’t?Who Doesn’t?
VHF/UHF ApplicationsVHF/UHF Applications
FM broadcast RadioFM broadcast Radio Broadcast TVBroadcast TV Local Radio CommunicationLocal Radio Communication
• PolicePolice• CommercialCommercial
Cell PhonesCell Phones Satellite CommunicationsSatellite Communications 802.11b/g802.11b/g
UHF/VHF modesUHF/VHF modes
FM, USB, LSB, AM (on lower freqs)FM, USB, LSB, AM (on lower freqs) Digital modesDigital modes
• Packet RadioPacket Radio• Digital VoiceDigital Voice• IRLPIRLP• APRSAPRS
UHF/VHF RepeatersUHF/VHF Repeaters
Retransmit signals Retransmit signals • Longer usable rangeLonger usable range
Receive on one FrequencyReceive on one Frequency Transmit on a separate FrequencyTransmit on a separate Frequency IntermodulationIntermodulation
• Duplexers Duplexers
IRLPIRLP Internet Radio Linking ProjectInternet Radio Linking Project
• Connects Repeaters Connects Repeaters • Uses Internet For connectionUses Internet For connection
Amateur SatelliteAmateur Satellite
VHF for transmitVHF for transmit UHF for receiveUHF for receive TypesTypes
• RepeatersRepeaters• Digipeaters Digipeaters • Other data Other data
Beyond UHFBeyond UHF
3-300GHZ (Microwave region)3-300GHZ (Microwave region) Large BandwidthLarge Bandwidth Highly subject to line of sightHighly subject to line of sight Very low powerVery low power
• Health hazard Health hazard Highly directional signals usedHighly directional signals used
Applications 3-300GHZApplications 3-300GHZ
Wireless Data LinksWireless Data Links Broadband Internet linksBroadband Internet links
• Large bandwidthLarge bandwidth RadarRadar Wireless USBWireless USB
What is Amateur RadioWhat is Amateur Radio
HobbyHobby Provide Emergency CommunicationProvide Emergency Communication
• Much more resilient than convention Much more resilient than convention telephone lines / cell phonestelephone lines / cell phones
Experiment with new forms of RF Experiment with new forms of RF communicationcommunication
How to Become a HamHow to Become a Ham
Three License ClassesThree License Classes• TechnicianTechnician• GeneralGeneral• ExtraExtra
Take a Written Multiple Choice TestTake a Written Multiple Choice Test
Dipole AntennaDipole Antenna
2.4 DB gain for ¼ wave2.4 DB gain for ¼ wave ¼, ½, 5/8, wave versions¼, ½, 5/8, wave versions
Other Types Of AntennasOther Types Of Antennas
LoopLoop YagiYagi Cubical QuadCubical Quad Ground PlaneGround Plane AperatureAperature Crossed YagiCrossed Yagi HelixHelix