LOTHIANS RADIO SOCIETY GM3HAM...Talks –Amateur Digital Modes Raised Cosine waveform-smoothly...

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LOTHIANS RADIO SOCIETY LOTHIANS RADIO SOCIETY GM3HAM GM3HAM Edinburgh Edinburgh Founded in 1947 Founded in 1947 Affiliated to the Radio Affiliated to the Radio Society of Great Britain Society of Great Britain

Transcript of LOTHIANS RADIO SOCIETY GM3HAM...Talks –Amateur Digital Modes Raised Cosine waveform-smoothly...

Page 1: LOTHIANS RADIO SOCIETY GM3HAM...Talks –Amateur Digital Modes Raised Cosine waveform-smoothly changes from 0 to 1 like a cosine wave, avoiding square-wave switching-noise on phase-

LOTHIANS RADIO SOCIETYLOTHIANS RADIO SOCIETY

GM3HAMGM3HAMEdinburghEdinburgh

Founded in 1947Founded in 1947

Affiliated to the Radio Affiliated to the Radio Society of Great BritainSociety of Great Britain

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Welcome to the Welcome to the LothiansLothians!!

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Meetings on 2Meetings on 2ndnd & 4& 4thth WednesdaysWednesdays

Braid Hills Hotel, EdinburghBraid Hills Hotel, Edinburgh

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Talks Talks –– Border Search & Rescue UnitBorder Search & Rescue Unit

Photo courtesy BSARU

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Talks Talks –– Military ElectronicsMilitary Electronics

Page 6: LOTHIANS RADIO SOCIETY GM3HAM...Talks –Amateur Digital Modes Raised Cosine waveform-smoothly changes from 0 to 1 like a cosine wave, avoiding square-wave switching-noise on phase-

Talks Talks –– Amateur Digital ModesAmateur Digital Modes

Raised Cosine waveform- smoothly changes from 0 to 1 like a cosine wave, avoiding square-wave switching-noise on phase-change being transmitted.

This provides minimum bandwidth properties

The amplitude changes are used to synchronize the receiver clock

PSK31 WaveformPSK31 Waveform

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Talks Talks –– Microelectronics TechnologyMicroelectronics Technology

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Talks Talks –– Central Scotland Repeater GroupCentral Scotland Repeater Group

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Talks Talks –– Aviation ElectronicsAviation Electronics

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Surplus Equipment (Junk) SalesSurplus Equipment (Junk) Sales

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Surplus Equipment (Junk) SalesSurplus Equipment (Junk) Sales

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Christmas Curry NightChristmas Curry Night

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Visits to Museum of CommunicationVisits to Museum of Communication

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Visits to Museum of CommunicationVisits to Museum of Communication

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LRS at LRS at CockenzieCockenzie Junk NightJunk Night

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LRS at LRS at BlackpoolBlackpool RallyRally

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D/F HuntD/F Hunt

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D/F HuntD/F Hunt

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D/F Hunt D/F Hunt –– ““FoxFox”” StationStation

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Annual BarbecueAnnual Barbecue

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Annual BarbecueAnnual Barbecue

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Annual BarbecueAnnual Barbecue

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Contest Trophy Winners !Contest Trophy Winners !

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Field Day in the 1950sField Day in the 1950s

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Field Day in the 1960sField Day in the 1960s

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Current Contests Site Current Contests Site –– Gatehouse of FleetGatehouse of Fleet

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Microwave Contest 2010Microwave Contest 2010

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Microwave Contest 2010Microwave Contest 2010

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Microwave Contest 2010Microwave Contest 2010

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Microwave Contest 2010Microwave Contest 2010

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Microwave Contest 2010Microwave Contest 2010

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Microwave Contest 2010Microwave Contest 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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VHF NFD 2010VHF NFD 2010

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Pub Nights Pub Nights –– Come and Join Us!Come and Join Us!

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Pub Nights Pub Nights –– Come and Join Us!Come and Join Us!


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LOTHIANS RADIO SOCIETY GM3HAM · LRS_Promotional_PowerPoint3 Author: user Created Date: 10/21/2010 1:53:20 PM Keywords () ...

LOTHIANS RADIO SOCIETY GM3HAM · LRS_Promotional_PowerPoint3 Author: user Created Date: 10/21/2010 1:53:20 PM Keywords () ...

3.2 Notes Sine and Cosine Ratios Cosine and Sine ratios · 2019. 11. 29. · 3.2 Notes Sine and Cosine Ratios Cosine and Sine ratios: - We have learned about tangent ratios. - Sine

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Cosine Similarity Measure of Interval Valued Neutrosophic Setsfs.unm.edu/ScArt/CosineSimilarityMeasureInterval.pdfThe cosine similarity measure is the cosine of the angle between the

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Summary Wave motion (1) · • Whenever you see a cosine you should consider converting it to an exponential! exp(ix)=cos(x)+ i sin(x) • Basic wave in exponential form is cos(kx

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Complex Sinusoids - ALLSIGNALPROCESSING.COM...Key Concepts 1)The real part of a complex sinusoid is a cosine wave and the imag-inary part is a sine wave. 2)A complex sinusoid x(t)

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