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Past Presentations and Articles

Some documents rescued from the old IVARC site - hopefully their owners well recognise them and add an appropriate synopsis

 Graham King G3XSD  How aerials really, really work
aerials.pdf
File Size: 2108 kb
File Type: pdf
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Graham King G3XSD How can I do DSP on my microcontroller 


dsp1.pdf
File Size: 68 kb
File Type: pdf
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dsp2.pdf
File Size: 234 kb
File Type: pdf
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dsp3.pdf
File Size: 212 kb
File Type: pdf
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dsp4.pdf
File Size: 128 kb
File Type: pdf
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dsp5.pdf
File Size: 119 kb
File Type: pdf
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dsp6.pdf
File Size: 220 kb
File Type: pdf
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An Introduction to Echolink
John Noden G8IOK January 2008
echolink.ppt
File Size: 179 kb
File Type: ppt
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Electronic QSLing with eQSL - Ted Stiles G8BHK
electronic_qsling_with_eqsl.pdf
File Size: 355 kb
File Type: pdf
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50MHz Collapsible 2 Element Mini Beam: 
An Overview the Development of the “6MBA”
Mike Parkin GØJMI
g0jmi_-_radio_club__presentation_001.pdf
File Size: 5894 kb
File Type: pdf
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Loops and how antennas (aerials ) really work
Professor Mike Underhill - G3LHZ June 2010
g3lhz.pptx
File Size: 17843 kb
File Type: pptx
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Digital TV: ATV, Freeview, Freesat and all that…
Noel Matthews G8GTZ August 2009
g8gtz_aug_09.ppt
File Size: 6167 kb
File Type: ppt
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  Feld Hellschreiber  Graham King G3XSD
hellinfosheet.pdf
File Size: 273 kb
File Type: pdf
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Band Pass Filter Design - Richard Harris G3OTK
1_filter_article_version_2.pdf
File Size: 147 kb
File Type: pdf
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2._qandkmethod.pdf
File Size: 125 kb
File Type: pdf
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3._nortonstheorem.pdf
File Size: 55 kb
File Type: pdf
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4._improvinghfsideresponse.pdf
File Size: 58 kb
File Type: pdf
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5._bartletts.pdf
File Size: 43 kb
File Type: pdf
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6._inductorlosses.pdf
File Size: 76 kb
File Type: pdf
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7_zmatching.pdf
File Size: 76 kb
File Type: pdf
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8._predistortedfilters.pdf
File Size: 60 kb
File Type: pdf
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9._measurements.pdf
File Size: 181 kb
File Type: pdf
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Low-power beacons
Paul Wilton M1CNK  June 2009

A brief introduction to setting up and receiving low power beacons - QRSS and WSPR.
mept-talk-for-ivr.pdf
File Size: 5886 kb
File Type: pdf
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Introduction to VHF/UHF Propagation
Paul Wilton M1CNK June 2013
An introduction to the different mechanisms behind VHF and UHF propagation and how to optimise their use.
an_introduction_to_vhf_talk_2013.pdf
File Size: 1820 kb
File Type: pdf
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RF ground, counterpoises and elevated radials
Graham King G3XSD
rfgroundpaper.pdf
File Size: 242 kb
File Type: pdf
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Software Defined Radio
Graham King G3XSD
sdrtalk.pdf
File Size: 482 kb
File Type: pdf
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Security
securitypt1.pdf
File Size: 323 kb
File Type: pdf
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securitypt2.pdf
File Size: 1957 kb
File Type: pdf
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Small Garden Antennas  Graham King G3XSD
small_garden_antennas1.pdf
File Size: 454 kb
File Type: pdf
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Radio Amateur Test Gear
Paul Wilton M1CNK
A brief run through of useful test gear for the radio amateur, including some based upon low cost micro-controllers.
test_gear_for_the_radio_amateur.pdf
File Size: 9340 kb
File Type: pdf
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A Tale of two digimodes
Graham King G3XSD

hellolivia1.pdf
File Size: 8829 kb
File Type: pdf
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Key-clicks and CW Waveform Shaping
Richard Harris G3OTK

keyclicks_version_1.pdf
File Size: 756 kb
File Type: pdf
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A 3 Band QRP CW Transceiver
Richard Harris G3OTK

a_3_band_qrp_cw_transceiver_version_3.5.pdf
File Size: 1486 kb
File Type: pdf
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The W3DZZ antenna  

Graham King G3XSD

w3dzzslides.pdf
File Size: 1057 kb
File Type: pdf
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​Loop Antennas
Glyn Thomas M0GXT
Paul Wilton M1CNK
loop_antenna_extra_ivarc_talk_11aug2017.pdf
File Size: 4976 kb
File Type: pdf
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m1cnk_loop_talk_2017_08_11.pdf
File Size: 30617 kb
File Type: pdf
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14/21 MHz Trap dipole
Graham King G3XSD                                                                                       
trap1.pdf
File Size: 1444 kb
File Type: pdf
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Multi-Band Magnetic Loops

Alan Badcock
G8IPQ

multi-band_hf_magnetic_loop_slides_-1.pdf
File Size: 3770 kb
File Type: pdf
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Practical usage of  MMANA-GAL for antenna modelling

Graham King 
G3XSD

mmana-galpractical__use.pdf
File Size: 1406 kb
File Type: pdf
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Enigma: The code and its cryptanalysis, a broad        overview of the Allied effort to decipher ENIGMA     traffic before and during WWII

Steve Tindale
G8XEV



Waterfall Bandmap video in N1MM

A short mp4 example using SDRPlay RSP1A for panadaptor operation and a Kenwood TS-590S as the main transceiver.   The antenna is the IVARC active rx loop. Sound is included. Simply click on the 'play' button
and click on the frame enlarge to full screen

Graham King
G3XSD

enigma.pdf
File Size: 4955 kb
File Type: pdf
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Waterfall Bandmap/N1MMplus used in the 'normal way'

The advantages of this are: more compact, and
if used with a cluster site, many signals will be
tagged with their callsigns and in addition clicking
on the callsign causes the call to be entered in the log

Graham King
G3XSD

How to configure and use N1MM+ when starting 80m CW club contests

As part of the IVARC Morse school training sessions, this guide helps getting started and dipping one's toes into contesting

Graham King
G3XSD



n1mm_usage.pdf
File Size: 1269 kb
File Type: pdf
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How to configure and use N1MM+ 80mCW club contests
Part 2


This part shows how to submit your log to the RSGB
Contest Committee

Graham King
G3XSD






Maritime Radio... then and now

Graham King
G3XSD/GWZM/GYMT/GZSV


n1mm_usage2.pdf
File Size: 391 kb
File Type: pdf
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marineradio.pdf
File Size: 3773 kb
File Type: pdf
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Steppir user/installation guide

2e-yagi-manual-rev-3.1-march-2020.pdf
File Size: 12497 kb
File Type: pdf
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Improving an antenna
A brief talk on how Paul M1CNK improved a G7FEK antenna using a novel way to compare it's true performance against a reference antenna.  Presented 14 April 2023

antenna_improvements.pdf
File Size: 37783 kb
File Type: pdf
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Noise assessment for Field Day Site choice                                                                                            
Graham King G3XSD/G5T


noiseassessment1.pdf
File Size: 1101 kb
File Type: pdf
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Ionograms and Ionosondes 
Graham King G3XSD/G5T
A talk on what they are and how to use them in the context of amateur radio
HF communications.  What displayed parameters matter and which comment
on the state of the magnetosphere and the solar wind, including how to interpret
available data                                                         

ionosondes_and_ionograms.pdf
File Size: 1056 kb
File Type: pdf
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A WiFi link from remote nanoVNA                                                                                                                
Duncan Keith    G3RQF
A talk about using a laptop and a Pi zero W to
obtain and bigger and more comprehensive  
screen size together with improving the robustness 
and stability of SMA connectors in a field-working context                                             

nanovna-wifi_lecture_.pdf
File Size: 408 kb
File Type: pdf
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Getting Started on HF
Ken Hastie G4DKH and Graham King G3XSD/G5T
A talk about starting off on HF specifically aimed at those
wanting to venture onto HF for the first time.


brickworks_hf__antennas.pdf
File Size: 809 kb
File Type: pdf
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Brickworks – Dual band J-poles for VHF and UHF
A talk by Chris Ash G7LWV concerning the principles and
practice of the J-pole antenna and its pros and cons for
those entering Amateur Radio and seeking to get on the air at 2m and 70cm


dual_band_j-poles.pdf
File Size: 961 kb
File Type: pdf
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 Introduction to DMR for Amateur Radio                                                                                               
A talk by Chris Ash G7LWV                                                                                                         

dmr_ivarc_slides_update_2025.pdf
File Size: 2990 kb
File Type: pdf
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Aerial Current Measurement
by Duncan Keith G3RQF

aerial_current_measurement.pdf
File Size: 1629 kb
File Type: pdf
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Vertical End Fed Dipoles
​by Paul Wilton M1CNK
vertical_coaxial_end_fed_dipoles.pdf
File Size: 33250 kb
File Type: pdf
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