http://vk1od.net VK1OD on the 'net news en-us webmaster@vk1od.net (webmaster) webmaster@vk1od.net (webmaster) Owen Duffy http://vk1od.net http://www.vk1od.net/Vk1odOnTheNet.jpg Spotless days around solar cycle transition Aug 10 Sat, 04 Sep 2010 00:00:00 +0000 http://vk1od.net/propagation/solar/spotless.htm http://vk1od.net/propagation/solar/spotless.htm-04/09/10 Propagation HF current balun project Fri, 03 Sep 2010 00:00:00 +0000 http://vk1od.net/balun/G1-1-28-053-31/index.htm http://vk1od.net/balun/G1-1-28-053-31/index.htm-03/09/10 Transmission Lines Field Strength Calculator (FSC) update - V1.0.10 Mon, 30 Aug 2010 00:00:00 +0000 http://vk1od.net/software/fsc/support.htm#download http://vk1od.net/software/fsc/support.htm#download-30/08/10 Software Loss in antenna conductor materials Tue, 24 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/conductors/loss.htm http://vk1od.net/antenna/conductors/loss.htm-24/08/10 Antennas A graphical explanation of energy flow in a practical transmission line Mon, 16 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/getl/index.htm http://vk1od.net/transmissionline/getl/index.htm-16/08/10 Transmission Lines Measuring TS2000 Noise Figure using NFM and RFD2305 Sat, 14 Aug 2010 00:00:00 +0000 http://vk1od.net/software/nfm/applications/RFD2305-TS2000.htm http://vk1od.net/software/nfm/applications/RFD2305-TS2000.htm-14/08/10 Receivers Noise Figure Meter (NFM) update - V1.9.0 Sat, 14 Aug 2010 00:00:00 +0000 http://vk1od.net/software/nfm/support.htm#download http://vk1od.net/software/nfm/support.htm#download-14/08/10 Software Ambient noise survey, Bowral NSW on 40m, 13/08/2010 Fri, 13 Aug 2010 00:00:00 +0000 http://vk1od.net/software/fsm/cs/04/index.htm http://vk1od.net/software/fsm/cs/04/index.htm-13/08/10 Receivers Measuring average or mean power of a complex radio frequency wave Thu, 12 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/avgpwr.htm http://vk1od.net/measurement/avgpwr.htm-12/08/10 Measurement Optimum length of ladder line Thu, 12 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/LOLL/optlen.htm http://vk1od.net/transmissionline/LOLL/optlen.htm-12/08/10 Transmission Lines Reorganisation of VK1OD.net Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/reorganisation.htm http://vk1od.net/reorganisation.htm-08/08/10 Admin Effect of receiver mismatch on line loss and system noise performance Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/rx/misc/rmmlna.htm http://vk1od.net/rx/misc/rmmlna.htm-08/08/10 Receivers Making sense of the frequency readout on transceivers Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/frequencycalibration/msfr.htm http://vk1od.net/measurement/frequencycalibration/msfr.htm-08/08/10 Measurement Measuring noise with an AM receiver Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/noise/mnam.htm http://vk1od.net/measurement/noise/mnam.htm-08/08/10 Measurement What is RF Peak Envelope Power (PEP) Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/RfPowerTerms/PEP.htm http://vk1od.net/measurement/RfPowerTerms/PEP.htm-08/08/10 Measurement ATU efficiency – an example Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/concept/atue.htm http://vk1od.net/tx/concept/atue.htm-08/08/10 Antennas Corrosion protection of antenna connections Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/cpec.htm http://vk1od.net/antenna/misc/cpec.htm-08/08/10 Antennas Shielded station earth conductor Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/ssec.htm http://vk1od.net/antenna/misc/ssec.htm-08/08/10 Antennas The effect of a short discontinuity in transmission line characteristic impedance Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/discontinuity.htm http://vk1od.net/transmissionline/discontinuity.htm-08/08/10 Transmission Lines Twelfth wave TL transformers Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/twt.htm http://vk1od.net/transmissionline/twt.htm-08/08/10 Transmission Lines ARRL transmission line loss graphs Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/alt.htm http://vk1od.net/transmissionline/alt.htm-08/08/10 Transmission Lines Accuracy of VSWR meters at high sensitivity Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/vmhsl.htm http://vk1od.net/transmissionline/VSWR/vmhsl.htm-08/08/10 Transmission Lines Inductance of RF cored inductors and transformers Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/balun/concept/ri.html http://vk1od.net/balun/concept/ri.html-08/08/10 Baluns Counting turns on a toroidal core Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/balun/concept/tt.htm http://vk1od.net/balun/concept/tt.htm-08/08/10 Baluns Chinese concrete mixer performance Sun, 08 Aug 2010 00:00:00 +0000 http://vk1od.net/other/ConcreteMixer.htm http://vk1od.net/other/ConcreteMixer.htm-08/08/10 Other The Beta or Hairpin Match Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/BetaMatch.htm http://vk1od.net/antenna/misc/BetaMatch.htm-06/08/10 Antennas An explanation of the Comet CHA250 Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/CHA250.htm http://vk1od.net/antenna/misc/CHA250.htm-06/08/10 Antennas Estimating T match ATU efficiency Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/ATU/TMatchEfficiency.htm http://vk1od.net/antenna/ATU/TMatchEfficiency.htm-06/08/10 Antennas Transmit ALC and RF Power Amplifiers Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/misc/ALC.htm http://vk1od.net/tx/misc/ALC.htm-06/08/10 Transmitters Power rating of the BLF278 in class AB Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/misc/BLF278.htm http://vk1od.net/tx/misc/BLF278.htm-06/08/10 Transmitters Power rating of the BLF248 in class AB Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/misc/BLF248.htm http://vk1od.net/tx/misc/BLF248.htm-06/08/10 Transmitters Thoughts on improvements to the PA0V 144MHz BLF278 amplifier output circuit Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/misc/PA0V144.htm http://vk1od.net/tx/misc/PA0V144.htm-06/08/10 Transmitters Synthetic fibre rope for antenna rigging Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/rigging/SyntheticRope.htm http://vk1od.net/rigging/SyntheticRope.htm-06/08/10 Rigging Mast tube designMast tube design Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/rigging/MastTube.htm http://vk1od.net/rigging/MastTube.htm-06/08/10 Rigging Is the K0FF mast step safe? Fri, 06 Aug 2010 00:00:00 +0000 http://vk1od.net/rigging/K0ffMastStep.htm http://vk1od.net/rigging/K0ffMastStep.htm-06/08/10 Rigging In pursuit of dipole resonance with an MFJ259B Thu, 05 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/isdr.htm http://vk1od.net/antenna/misc/isdr.htm-05/08/10 Antennas Optimising a coax fed half wave dipole Thu, 05 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/ohd.htm http://vk1od.net/antenna/misc/ohd.htm-05/08/10 Antennas Link coupling transformation ratio Thu, 05 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/concept/lctr.htm http://vk1od.net/tx/concept/lctr.htm-05/08/10 Transmitters Collins 30L-1 and AM Thu, 05 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/30L1/AM.htm http://vk1od.net/tx/30L1/AM.htm-05/08/10 Transmitters Minimum length of a non-resonant multi-band dipole Thu, 05 Aug 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/mdl.htm http://vk1od.net/antenna/misc/mdl.htm-05/08/10 Antennas Envelope Distortion in SSB AM Tue, 03 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/concept/SsbAm.htm http://vk1od.net/tx/concept/SsbAm.htm-03/08/10 Transmitters Spectral content of anode current in Class B/AB RF amplifier Tue, 03 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/concept/ABSpectrum.htm http://vk1od.net/tx/concept/ABSpectrum.htm-03/08/10 Transmitters Feeding multiband dipoles with open wire feeder and balun Tue, 03 Aug 2010 00:00:00 +0000 http://vk1od.net/tx/concept/multibanddipole.htm http://vk1od.net/tx/concept/multibanddipole.htm-03/08/10 Transmitters Is a 4:1 balun a good choice for use with an ATU on HF? Tue, 03 Aug 2010 00:00:00 +0000 http://vk1od.net/balun/concept/4to1.htm http://vk1od.net/balun/concept/4to1.htm-03/08/10 Baluns Baluns and ATUs Tue, 03 Aug 2010 00:00:00 +0000 http://vk1od.net/balun/concept/ba.htm http://vk1od.net/balun/concept/ba.htm-03/08/10 Baluns Loss components in practical transmission lines at HF Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/lc.htm http://vk1od.net/transmissionline/lc.htm-02/08/10 Transmission Lines Does SWR damage HF ham transmitters? Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/damage.htm http://vk1od.net/transmissionline/VSWR/damage.htm-02/08/10 Transmission Lines A simple VSWR analysis without mirrors Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/womirror.html http://vk1od.net/transmissionline/VSWR/womirror.html-02/08/10 Transmission Lines Improved resolution of relative power measurement using a directional wattmeter Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/irpm.htm http://vk1od.net/measurement/irpm.htm-02/08/10 Measurement Using my Excel cubic spline interpolation functions Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/ucs.htm http://vk1od.net/measurement/ucs.htm-02/08/10 Measurement Digitising published graphs of component characteristics Mon, 02 Aug 2010 00:00:00 +0000 http://vk1od.net/measurement/ddc.htm http://vk1od.net/measurement/ddc.htm-02/08/10 Measurement Correct use of wire rope (‘bulldog’) grips Sun, 01 Aug 2010 00:00:00 +0000 http://vk1od.net/rigging/bulldog.htm http://vk1od.net/rigging/bulldog.htm-01/08/10 Rigging Comment on W6VAT article on VSWR Sun, 01 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/W6VAT.htm http://vk1od.net/transmissionline/VSWR/W6VAT.htm-01/08/10 Transmission Lines Antennex publishes Owen Duffy? Sun, 01 Aug 2010 00:00:00 +0000 http://vk1od.net/misc/antennex.htm http://vk1od.net/misc/antennex.htm-01/08/10 Admin Field Strength Meter (FSM) update - V1.4.1 Fri, 02 Jul 2010 00:00:00 +0000 http://vk1od.net/software/fsm/support.htm#download http://vk1od.net/software/fsm/support.htm#download-02/07/10 Software FINDDR updated - V1.04 Mon, 28 Jun 2010 00:00:00 +0000 http://vk1od.net/software/finddr/finddr.htm http://vk1od.net/software/finddr/finddr.htm-28/06/10 Software