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 The DK7ZB balun Thu, 23 May 2013 00:00:00 +0000 http://vk1od.net/balun/DK7ZB/index.htm http://vk1od.net/balun/DK7ZB/index.htm-23/05/13 Baluns The G0KSC hybrid balun Wed, 08 May 2013 00:00:00 +0000 http://vk1od.net/balun/G0KSC/index.htm http://vk1od.net/balun/G0KSC/index.htm-08/05/13 Baluns Peak amplifier for Bird 43 coupler directional wattmeter by F6DFZ Fri, 03 May 2013 00:00:00 +0000 http://vk1od.net/module/PepAmp/F6DFZ.htm http://vk1od.net/module/PepAmp/F6DFZ.htm-03/05/13 Equipment Acrylic plinth for small card modules Thu, 02 May 2013 00:00:00 +0000 http://vk1od.net/hardware/apfpm/index.htm http://vk1od.net/hardware/apfpm/index.htm-02/05/13 Equipment Sensorless brushless DC motor - an explanation Sun, 28 Apr 2013 00:00:00 +0000 http://vk1od.net/rc/BLDC/index.htm http://vk1od.net/rc/BLDC/index.htm-28/04/13 Equipment Antenna analyser accuracy on extreme impedances Sat, 27 Apr 2013 00:00:00 +0000 http://vk1od.net/measurement/AA/index.htm http://vk1od.net/measurement/AA/index.htm-27/04/13 Measurement Interpretation of transmitting triode valve data sheets for RF power amplifiers Sun, 21 Apr 2013 00:00:00 +0000 http://vk1od.net/tx/itds/index.htm http://vk1od.net/tx/itds/index.htm-21/04/13 Transmitters The failure of lossless line analysis in the real world Sat, 30 Mar 2013 00:00:00 +0000 http://vk1od.net/transmissionline/folla/index.htm http://vk1od.net/transmissionline/folla/index.htm-30/03/13 Transmission Lines Power Amplifier Run On Timer (PAROT) Fri, 29 Mar 2013 00:00:00 +0000 http://vk1od.net/module/parot/index.htm http://vk1od.net/module/parot/index.htm-29/03/13 Equipment Bowral G5RV for local contacts Mon, 18 Mar 2013 00:00:00 +0000 http://vk1od.net/antenna/BowralG5RV/index.htm http://vk1od.net/antenna/BowralG5RV/index.htm-18/03/13 Antennas A comparison of a G5RV at VK1OD and QW vertical at VK2DVK on 40m over a 14,700km path using QRSS Sun, 17 Mar 2013 00:00:00 +0000 http://vk1od.net/grabber/cs10/index.htm http://vk1od.net/grabber/cs10/index.htm-17/03/13 Antennas Generic heating / cooling controller Sat, 16 Mar 2013 00:00:00 +0000 http://vk1od.net/module/hcctl/index.htm http://vk1od.net/module/hcctl/index.htm-16/03/13 Equipment Arduino thermometer - a tutorial Sat, 09 Mar 2013 00:00:00 +0000 http://vk1od.net/module/ArduinoThermometer/index.htm http://vk1od.net/module/ArduinoThermometer/index.htm-09/03/13 Equipment Factorise integer Sat, 09 Mar 2013 00:00:00 +0000 http://vk1od.net/calc/factorise.htm http://vk1od.net/calc/factorise.htm-09/03/13 Software Wade's statistical nature of noise Tue, 05 Mar 2013 00:00:00 +0000 http://vk1od.net/measurement/noise/snn.htm http://vk1od.net/measurement/noise/snn.htm-05/03/13 Measurement Thinking aloud on the VK3XDK 10GHz transverter receiver performance Sat, 02 Mar 2013 00:00:00 +0000 http://vk1od.net/equipment/VK3XDK-10GHz/index.htm http://vk1od.net/equipment/VK3XDK-10GHz/index.htm-02/03/13 Equipment Morse beacon keyer for a cluster of transmitters Wed, 06 Feb 2013 00:00:00 +0000 http://vk1od.net/module/smbk/cluster.htm http://vk1od.net/module/smbk/cluster.htm-06/02/13 Equipment Capturing QRSS3 with Spectrum Lab Wed, 06 Feb 2013 00:00:00 +0000 http://vk1od.net/grabber/SLCapture/index.htm http://vk1od.net/grabber/SLCapture/index.htm-06/02/13 Antennas Mastech MS6514 review Mon, 21 Jan 2013 00:00:00 +0000 http://vk1od.net/equipment/MS6514/index.htm http://vk1od.net/equipment/MS6514/index.htm-21/01/13 Equipment QST Jan 13 wire antenna loading Wed, 16 Jan 2013 00:00:00 +0000 http://vk1od.net/rigging/Qst1301/index.htm http://vk1od.net/rigging/Qst1301/index.htm-16/01/13 Rigging VK1KW QRSS beacon on 2m 15/01/13 Tue, 15 Jan 2013 00:00:00 +0000 http://vk1od.net/grabber/cs08/index.htm http://vk1od.net/grabber/cs08/index.htm-15/01/13 Antennas Yet another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS Mon, 14 Jan 2013 00:00:00 +0000 http://vk1od.net/grabber/cs07/index.htm http://vk1od.net/grabber/cs07/index.htm-14/01/13 Antennas Another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS Sat, 05 Jan 2013 00:00:00 +0000 http://vk1od.net/grabber/cs06/index.htm http://vk1od.net/grabber/cs06/index.htm-05/01/13 Antennas Spotless days around solar cycle transition Jan13 Wed, 02 Jan 2013 00:00:00 +0000 http://vk1od.net/propagation/solar/spotless.htm http://vk1od.net/propagation/solar/spotless.htm-02/01/13 Propagation Distribution of S/N ratio under fading on HF Sun, 30 Dec 2012 00:00:00 +0000 http://vk1od.net/grabber/cs05/index.htm http://vk1od.net/grabber/cs05/index.htm-30/12/12 Antennas A comparison of a 40m quarter wave verticals with elevated radials and horizontal dipole over a 14,700km path using QRSS Mon, 24 Dec 2012 00:00:00 +0000 http://vk1od.net/grabber/cs04/index.htm http://vk1od.net/grabber/cs04/index.htm-24/12/12 Antennas A comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS Sun, 23 Dec 2012 00:00:00 +0000 http://vk1od.net/grabber/cs03/index.htm http://vk1od.net/grabber/cs03/index.htm-23/12/12 Antennas Thoughts on "Improved Dynamic-Range Testing" by Doug Smith Sun, 16 Dec 2012 00:00:00 +0000 http://vk1od.net/measurement/noise/qn.htm http://vk1od.net/measurement/noise/qn.htm-16/12/12 Measurement Another Morse beacon keyer - A/B RF switching Thu, 13 Dec 2012 00:00:00 +0000 http://vk1od.net/module/smbk/AB.htm http://vk1od.net/module/smbk/AB.htm-13/12/12 Equipment Hand wound power transformers Fri, 07 Dec 2012 00:00:00 +0000 http://vk1od.net/module/hwpt/index.htm http://vk1od.net/module/hwpt/index.htm-07/12/12 Equipment Fan controller for Manson EP-613 / Jaytech MP-3082 with fan Sun, 02 Dec 2012 00:00:00 +0000 http://vk1od.net/equipment/EP613/fanctl.htm http://vk1od.net/equipment/EP613/fanctl.htm-02/12/12 Equipment Button cells in digital calipers and the like Tue, 20 Nov 2012 00:00:00 +0000 http://vk1od.net/hardware/SR44/index.htm http://vk1od.net/hardware/SR44/index.htm-20/11/12 Equipment Compatibility of HRD/DM780 with Digi Portserver TS4 Fri, 16 Nov 2012 00:00:00 +0000 http://vk1od.net/equipment/DM780-TS4/index.htm http://vk1od.net/equipment/DM780-TS4/index.htm-16/11/12 Equipment Ameritron ATR-30 Thu, 15 Nov 2012 00:00:00 +0000 http://vk1od.net/antenna/ATR30/index.htm http://vk1od.net/antenna/ATR30/index.htm-15/11/12 Equipment Palstar AT2K Tue, 13 Nov 2012 00:00:00 +0000 http://vk1od.net/antenna/AT2K/index.htm http://vk1od.net/antenna/AT2K/index.htm-13/11/12 Equipment GPS PPS Utility (gpsppsu) Sun, 11 Nov 2012 00:00:00 +0000 http://vk1od.net/module/gpsppsu/index.htm http://vk1od.net/module/gpsppsu/index.htm-11/11/12 Equipment PllLdr - EEPROM data structure Wed, 07 Nov 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/struct.htm http://vk1od.net/module/PllLdr/struct.htm-07/11/12 Equipment Simple Morse beacon keyer - EEPROM data structure Fri, 02 Nov 2012 00:00:00 +0000 http://vk1od.net/module/smbk/struct.htm http://vk1od.net/module/smbk/struct.htm-02/11/12 Equipment Measuring RF power with an SSB receiver Wed, 24 Oct 2012 00:00:00 +0000 http://vk1od.net/rx/PowerMeter/index.htm http://vk1od.net/rx/PowerMeter/index.htm-24/10/12 Receivers RS232 Morse keyer Wed, 17 Oct 2012 00:00:00 +0000 http://vk1od.net/module/K3ngKeyer/index.htm http://vk1od.net/module/K3ngKeyer/index.htm-17/10/12 Equipment Dangerous male to male power adapters Mon, 15 Oct 2012 00:00:00 +0000 http://vk1od.net/measurement/m2m/index.htm http://vk1od.net/measurement/m2m/index.htm-15/10/12 Measurement Prolific PL-2303 problems Wed, 10 Oct 2012 00:00:00 +0000 http://vk1od.net/software/ATB/PL2303.htm http://vk1od.net/software/ATB/PL2303.htm-10/10/12 Hardware An A/B comparison on 40m over a 17,000km path using QRSS Mon, 08 Oct 2012 00:00:00 +0000 http://vk1od.net/grabber/cs02/index.htm http://vk1od.net/grabber/cs02/index.htm-08/10/12 Antennas S meter calibration and scale shape Fri, 05 Oct 2012 00:00:00 +0000 http://vk1od.net/rx/SMeter/index.htm http://vk1od.net/rx/SMeter/index.htm-05/10/12 Receivers AVR ATTiny programming adapter Mon, 01 Oct 2012 00:00:00 +0000 http://vk1od.net/module/atpa/index.htm http://vk1od.net/module/atpa/index.htm-01/10/12 Equipment An A/B comparison on 40m over a 14,700km path using QRSS Sun, 23 Sep 2012 00:00:00 +0000 http://vk1od.net/grabber/cs01/index.htm http://vk1od.net/grabber/cs01/index.htm-23/09/12 Antennas Simple Morse beacon keyer - update V3 Sat, 22 Sep 2012 00:00:00 +0000 http://vk1od.net/module/smbk/index.htm http://vk1od.net/module/smbk/index.htm-22/09/12 Equipment Simple Morse beacon keyer - using ATB Thu, 20 Sep 2012 00:00:00 +0000 http://vk1od.net/module/smbk/ATB.htm http://vk1od.net/module/smbk/ATB.htm-20/09/12 Equipment Another simple Morse beacon keyer - basic, but accurate Tue, 18 Sep 2012 00:00:00 +0000 http://vk1od.net/module/smbk/basic.htm http://vk1od.net/module/smbk/basic.htm-18/09/12 Equipment Measuring the velocity factor of coaxial transmission line Sun, 16 Sep 2012 00:00:00 +0000 http://vk1od.net/transmissionline/concept/mvf/index.htm http://vk1od.net/transmissionline/concept/mvf/index.htm-16/09/12 Transmission Lines Making inferences from QRSS grabber observations Wed, 12 Sep 2012 00:00:00 +0000 http://vk1od.net/grabber/inferences.htm http://vk1od.net/grabber/inferences.htm-12/09/12 Measurement ATB - a bootloader for AVR Tiny microcontrollers Tue, 11 Sep 2012 00:00:00 +0000 http://vk1od.net/software/ATB/index.htm http://vk1od.net/software/ATB/index.htm-11/09/12 Software Postbox - a user testimony Mon, 03 Sep 2012 00:00:00 +0000 http://vk1od.net/misc/postbox.htm http://vk1od.net/misc/postbox.htm-03/09/12 Software A narrowband current balun using coax line sections Sun, 26 Aug 2012 00:00:00 +0000 http://vk1od.net/balun/I4BBE/index.htm http://vk1od.net/balun/I4BBE/index.htm-26/08/12 Baluns A simple explanation of the voltage forcing property of a half wave transmission line Sun, 12 Aug 2012 00:00:00 +0000 http://vk1od.net/antenna/misc/VoltageForcingHW.htm http://vk1od.net/antenna/misc/VoltageForcingHW.htm-12/08/12 Transmission Lines Lithium polymer batteries for ham radio applications Sun, 12 Aug 2012 00:00:00 +0000 http://vk1od.net/equipment/LiPower/index.htm http://vk1od.net/equipment/LiPower/index.htm-12/08/12 Equipment PC high voltage RF capacitors Sat, 11 Aug 2012 00:00:00 +0000 http://vk1od.net/antenna/PcCapacitor/index.htm http://vk1od.net/antenna/PcCapacitor/index.htm-11/08/12 Antennas Using a slide rule to solve deciBel problems Thu, 09 Aug 2012 00:00:00 +0000 http://vk1od.net/measurement/dbsr.htm http://vk1od.net/measurement/dbsr.htm-09/08/12 Measurement PllLdr application - Si4133G (VK3XDK Agile PLL) Sun, 05 Aug 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/cs04/index.htm http://vk1od.net/module/PllLdr/cs04/index.htm-05/08/12 Equipment RF current sampler Tue, 31 Jul 2012 00:00:00 +0000 http://vk1od.net/module/RfCurrentSampler/index.htm http://vk1od.net/module/RfCurrentSampler/index.htm-31/07/12 Equipment Skin depth calculator Sun, 22 Jul 2012 00:00:00 +0000 http://vk1od.net/calc/SkinDepth.htm http://vk1od.net/calc/SkinDepth.htm-22/07/12 Software Estimating Matched Line Loss from Return Loss Wed, 18 Jul 2012 00:00:00 +0000 http://vk1od.net/transmissionline/concept/MLLvHRL/index.htm http://vk1od.net/transmissionline/concept/MLLvHRL/index.htm-18/07/12 Transmission Lines Field Strength Meter (FSM) update - V1.6.0 Sun, 15 Jul 2012 00:00:00 +0000 http://vk1od.net/software/fsm/support.htm http://vk1od.net/software/fsm/support.htm-15/07/12 Software QRSS observation utilities Sun, 08 Jul 2012 00:00:00 +0000 http://vk1od.net/module/QrssTx/utility.htm http://vk1od.net/module/QrssTx/utility.htm-08/07/12 Receivers Manson EP-613 / Jaytech MP-3082 improvement Tue, 03 Jul 2012 00:00:00 +0000 http://vk1od.net/equipment/EP613/index.htm http://vk1od.net/equipment/EP613/index.htm-03/07/12 Equipment QRP QRSS Beacon Transmitter - on air Mon, 02 Jul 2012 00:00:00 +0000 http://vk1od.net/module/QrssTx/onair.htm http://vk1od.net/module/QrssTx/onair.htm-02/07/12 Receivers QRSS grabber @ VK1OD Tue, 26 Jun 2012 00:00:00 +0000 http://vk1od.net/grabber/grabber.php http://vk1od.net/grabber/grabber.php-26/06/12 Receivers QRP QRSS Beacon Transmitter Fri, 15 Jun 2012 00:00:00 +0000 http://vk1od.net/module/QrssTx/index.htm http://vk1od.net/module/QrssTx/index.htm-15/06/12 Equipment Setting up shunt matching with an MFJ259B or the like Thu, 07 Jun 2012 00:00:00 +0000 http://vk1od.net/antenna/concepts/ShuntMatch.htm http://vk1od.net/antenna/concepts/ShuntMatch.htm-07/06/12 Antennas Matching a 5/8λ vertical - example 1 Tue, 05 Jun 2012 00:00:00 +0000 http://vk1od.net/antenna/FiveEighth/cs01/index.htm http://vk1od.net/antenna/FiveEighth/cs01/index.htm-05/06/12 Antennas Calculate ferrite cored inductor Thu, 31 May 2012 00:00:00 +0000 http://vk1od.net/calc/toroid.htm http://vk1od.net/calc/toroid.htm-31/05/12 Software Identifying ferrite materials Tue, 29 May 2012 00:00:00 +0000 http://vk1od.net/balun/concept/cf.htm http://vk1od.net/balun/concept/cf.htm-29/05/12 Baluns Thinking aloud on pipe cap filters Mon, 14 May 2012 00:00:00 +0000 http://vk1od.net/transmissionline/pcf/index.htm http://vk1od.net/transmissionline/pcf/index.htm-14/05/12  Transmission Lines High frequency compensation of T/R relay Sat, 05 May 2012 00:00:00 +0000 http://vk1od.net/transmissionline/concept/RelayComp/index.htm http://vk1od.net/transmissionline/concept/RelayComp/index.htm-05/05/12 Transmission Lines The merit of measuring VSWR on an open wire line Wed, 02 May 2012 00:00:00 +0000 http://vk1od.net/transmissionline/OWLVSWR/index.htm http://vk1od.net/transmissionline/OWLVSWR/index.htm-02/05/12 Transmission Lines VK2WI AM broadcast on 7.146MHz - quality issues Wed, 02 May 2012 00:00:00 +0000 http://vk1od.net/misc/VK2WI/AM.htm http://vk1od.net/misc/VK2WI/AM.htm-02/05/12 Other Synthesisers and external reference clocks Sun, 29 Apr 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/RefTerm.htm http://vk1od.net/module/PllLdr/RefTerm.htm-29/04/12 Equipment Australian amateur population trends 1998 - 2011 Sat, 21 Apr 2012 00:00:00 +0000 http://vk1od.net/CQVK/AuHamLicences.htm http://vk1od.net/CQVK/AuHamLicences.htm-21/04/12 Other Anatek ESR Meter - VK1OD implementation Sat, 14 Apr 2012 00:00:00 +0000 http://vk1od.net/module/ESR/index.htm http://vk1od.net/module/ESR/index.htm-14/04/12 Equipment Terminating a single core hard wire on an insulator Sun, 01 Apr 2012 00:00:00 +0000 http://vk1od.net/rigging/TSCWOI.htm http://vk1od.net/rigging/TSCWOI.htm-01/04/12 Rigging MCU to load PLL configuration registers update Fri, 30 Mar 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/index.htm http://vk1od.net/module/PllLdr/index.htm-30/03/12 Equipment PllLdr application - BH1415F Fri, 30 Mar 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/cs03/index.htm http://vk1od.net/module/PllLdr/cs03/index.htm-30/03/12 Equipment dB, dBi, and dBd Mon, 19 Mar 2012 00:00:00 +0000 http://vk1od.net/antenna/concepts/dBd/index.htm http://vk1od.net/antenna/concepts/dBd/index.htm-19/03/12 Antennas Field Strength Calculator (FSC) update - V1.0.13 Tue, 13 Mar 2012 00:00:00 +0000 http://vk1od.net/software/fsc/support.htm http://vk1od.net/software/fsc/support.htm-13/03/12 Software Noise Figure Meter (NFM) update - V1.12.0 Tue, 13 Mar 2012 00:00:00 +0000 http://vk1od.net/software/nfm/support.htm http://vk1od.net/software/nfm/support.htm-13/03/12 Software Effect of reduced drive on Class B amplifier efficiency Tue, 13 Mar 2012 00:00:00 +0000 http://vk1od.net/tx/concept/ClassBEff/index.htm http://vk1od.net/tx/concept/ClassBEff/index.htm-13/03/12 Transmitters Comment on W8JI's 2006 coil measurement experiment Mon, 05 Mar 2012 00:00:00 +0000 http://vk1od.net/antenna/W8jiCoilExp/3ns.htm http://vk1od.net/antenna/W8jiCoilExp/3ns.htm-05/03/12 Antennas Are RF toroidal inductors self shielding Sun, 26 Feb 2012 00:00:00 +0000 http://vk1od.net/balun/concept/FluxLeakage.htm http://vk1od.net/balun/concept/FluxLeakage.htm-26/02/12 Baluns Balanced ATUs and common mode current Wed, 22 Feb 2012 00:00:00 +0000 http://vk1od.net/balun/concept/BalancedAtu.htm http://vk1od.net/balun/concept/BalancedAtu.htm-22/02/12 Baluns A worked example of a Bird 43 with a grossly mismatched load Sun, 19 Feb 2012 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/43Ex1.htm http://vk1od.net/transmissionline/VSWR/43Ex1.htm-19/02/12 Transmission Lines Thunderbolt GPS Disciplined Oscillator - VK1OD implementation Thu, 09 Feb 2012 00:00:00 +0000 http://vk1od.net/equipment/Thunderbolt/index.htm http://vk1od.net/equipment/Thunderbolt/index.htm-09/02/12 Equipment 137.7kHz QRSS on one chip (revised 3/2/12) Fri, 03 Feb 2012 00:00:00 +0000 http://vk1od.net/module/137.700Beacon/index.htm http://vk1od.net/module/137.700Beacon/index.htm-03/02/12 Transmitters Improving weak signal identification of FSK beacons Fri, 03 Feb 2012 00:00:00 +0000 http://vk1od.net/module/smbk/dual.htm http://vk1od.net/module/smbk/dual.htm-03/02/12 Equipment Effective Radiated Power (ERP) Tue, 17 Jan 2012 00:00:00 +0000 http://vk1od.net/antenna/concepts/erp.htm http://vk1od.net/antenna/concepts/erp.htm-17/01/12 Antennas Jaycar MI5104 inverter Mon, 16 Jan 2012 00:00:00 +0000 http://vk1od.net/hardware/MI5104/index.htm http://vk1od.net/hardware/MI5104/index.htm-16/01/12 Equipment DTR / RTS interface unit Sun, 15 Jan 2012 00:00:00 +0000 http://vk1od.net/module/DtrRtsInterface/index.htm http://vk1od.net/module/DtrRtsInterface/index.htm-15/01/12 Equipment Insertion Loss vs Transmission Loss Sun, 15 Jan 2012 00:00:00 +0000 http://vk1od.net/transmissionline/concept/iltl.htm http://vk1od.net/transmissionline/concept/iltl.htm-15/01/12 Transmission Lines Adjusting a loaded HF vertical Fri, 13 Jan 2012 00:00:00 +0000 http://vk1od.net/antenna/m40/alhfv.htm http://vk1od.net/antenna/m40/alhfv.htm-13/01/12 Antennas PllLdr application - AD9850/51 300Bd FSK Sun, 08 Jan 2012 00:00:00 +0000 http://vk1od.net/module/PllLdr/cs02/index.htm http://vk1od.net/module/PllLdr/cs02/index.htm-08/01/12 Equipment ZL1AN's transmission line challenge Mon, 09 Jan 2012 00:00:00 +0000 http://vk1od.net/transmissionline/ZL1AN/tlp1.htm http://vk1od.net/transmissionline/ZL1AN/tlp1.htm-09/01/12 Transmission Lines Setup of an FM AFSK transmitter Fri, 06 Jan 2012 00:00:00 +0000 http://vk1od.net/FM/AfskFmSetup/index.htm http://vk1od.net/FM/AfskFmSetup/index.htm-06/01/12 Transmitters APRS AFSK on VHF Wed, 04 Jan 2012 00:00:00 +0000 http://vk1od.net/FM/VhfAprs/index.htm http://vk1od.net/FM/VhfAprs/index.htm-04/01/12 Transmitters PllLdr application - AD9850 Wed, 28 Dec 2011 00:00:00 +0000 http://vk1od.net/module/PllLdr/cs01/index.htm http://vk1od.net/module/PllLdr/cs01/index.htm-28/12/11 Equipment Is the 133' centre fed multiband dipole a no-brainer Mon, 26 Dec 2011 00:00:00 +0000 http://vk1od.net/antenna/133nobrainer/index.htm http://vk1od.net/antenna/133nobrainer/index.htm-26/12/11 Antennas Calculate Vpk and Irms for given power at complex load Mon, 26 Dec 2011 00:00:00 +0000 http://vk1od.net/calc/tl/p2vi.htm http://vk1od.net/calc/tl/p2vi.htm-26/12/11 Software N0XAS ID-O-Matic - VK1OD implementation Fri, 09 Dec 2011 00:00:00 +0000 http://vk1od.net/equipment/ID-Omatic/index.htm http://vk1od.net/equipment/ID-Omatic/index.htm-09/12/11 Equipment A medium priced generator set from eBay Wed, 07 Dec 2011 00:00:00 +0000 http://vk1od.net/hardware/genset/index.htm http://vk1od.net/hardware/genset/index.htm-07/12/11 Equipment An experimental CPLD based PLL (revised) Sat, 03 Dec 2011 00:00:00 +0000 http://vk1od.net/module/CpldPll/index.htm http://vk1od.net/module/CpldPll/index.htm-03/12/11 Equipment Comment on W5DXP's 2011 coil measurement experiment Fri, 18 Nov 2011 00:00:00 +0000 http://vk1od.net/antenna/W5dxpCoilExp/index.htm http://vk1od.net/antenna/W5dxpCoilExp/index.htm-18/11/11 Antennas Exploitation of NEC's GM card Mon, 14 Nov 2011 00:00:00 +0000 http://vk1od.net/antenna/NEC/NecGm.htm http://vk1od.net/antenna/NEC/NecGm.htm-14/11/11 Antennas T Match efficiency estimator Sat, 12 Nov 2011 00:00:00 +0000 http://vk1od.net/calc/tmee.htm http://vk1od.net/calc/tmee.htm-12/11/11 Software Ambient noise survey, Hackett ACT on 40m, 06/03/2009 Sat, 12 Nov 2011 00:00:00 +0000 http://vk1od.net/software/fsm/cs/03/index.htm http://vk1od.net/software/fsm/cs/03/index.htm-12/11/11 Software PA0KLT Si570 Synthesiser - VK1OD implementation Sat, 12 Nov 2011 00:00:00 +0000 http://vk1od.net/module/PA0KLTSynth/index.htm http://vk1od.net/module/PA0KLTSynth/index.htm-12/11/11 Equipment Matching a 5/8λ vertical Thu, 03 Nov 2011 00:00:00 +0000 http://vk1od.net/antenna/FiveEighth/match.htm http://vk1od.net/antenna/FiveEighth/match.htm-03/11/11 Antennas In pursuit of dipole resonance with an MFJ259B revised Wed, 02 Nov 2011 00:00:00 +0000 http://vk1od.net/antenna/misc/isdr.htm http://vk1od.net/antenna/misc/isdr.htm-02/11/11 Antennas Is Zs of a HF ham tx typically 50+j0? Sun, 20 Jun 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/Zs50.htm http://vk1od.net/transmissionline/VSWR/Zs50.htm-20/06/10 Transmitters A test of Zs on an IC7000 Sun, 01 Aug 2010 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/ZsExp.htm http://vk1od.net/transmissionline/VSWR/ZsExp.htm-01/08/10 Transmitters Link coupling transformation ratio (expanded 29/10/11) Sat, 29 Oct 2011 00:00:00 +0000 http://vk1od.net/tx/concept/lctr.htm http://vk1od.net/tx/concept/lctr.htm-29/10/11 Transmitters Learning models or a poor workman always blames his tools Fri, 28 Oct 2011 00:00:00 +0000 http://vk1od.net/antenna/misc/PoorWorkman.htm http://vk1od.net/antenna/misc/PoorWorkman.htm-28/10/11 Antennas Bootstrap coax traps for antennas (expanded 10/11) Wed, 26 Oct 2011 00:00:00 +0000 http://vk1od.net/antenna/coaxtrap/index.htm http://vk1od.net/antenna/coaxtrap/index.htm-26/10/11 Antennas Differential flux leakage in a Guanella 1:1 balun Wed, 26 Oct 2011 00:00:00 +0000 http://vk1od.net/balun/concept/DiffFlux.htm http://vk1od.net/balun/concept/DiffFlux.htm-26/10/11 Baluns ATLLC Examples Mon, 10 Oct 2011 00:00:00 +0000 http://vk1od.net/calc/tl/atllcEx.htm http://vk1od.net/calc/tl/atllcEx.htm-10/10/11 Software RF Arbitrary Transmission Line Loss Calculator Sun, 09 Oct 2011 00:00:00 +0000 http://vk1od.net/calc/tl/atllc.htm http://vk1od.net/calc/tl/atllc.htm-09/10/11 Software Estimating parameters of two wire transmission lines Fri, 07 Oct 2011 00:00:00 +0000 http://vk1od.net/transmissionline/concept/ephmtwtl.htm http://vk1od.net/transmissionline/concept/ephmtwtl.htm-07/10/11 Transmission Lines Noise bridge measurement case study - Bowral dipole Fri, 07 Oct 2011 00:00:00 +0000 http://vk1od.net/measurement/NoiseBridge/cs02/index.htm http://vk1od.net/measurement/NoiseBridge/cs02/index.htm-07/10/11 Measurement Noise bridge measurement case study - shortened vertical monopole matching Thu, 06 Oct 2011 00:00:00 +0000 http://vk1od.net/measurement/NoiseBridge/cs01/index.htm http://vk1od.net/measurement/NoiseBridge/cs01/index.htm-06/10/11 Measurement Filament Management in Amateur Radio applications Wed, 28 Sep 2011 00:00:00 +0000 http://vk1od.net/tx/FilamentManagement/index.htm http://vk1od.net/tx/FilamentManagement/index.htm-28/09/11 Transmitters Does twisting a two wire open line reduce radiation Fri, 23 Sep 2011 00:00:00 +0000 http://vk1od.net/transmissionline/concept/twistedpairrad.htm http://vk1od.net/transmissionline/concept/twistedpairrad.htm-23/09/11 Transmission Lines Can a balun alter the tuning of an antenna system Tue, 13 Sep 2011 00:00:00 +0000 http://vk1od.net/balun/concept/cm/bz.htm http://vk1od.net/balun/concept/cm/bz.htm-13/09/11 Baluns Spoiling Class B Mon, 12 Sep 2011 00:00:00 +0000 http://vk1od.net/tx/concept/SpoilingClassB.htm http://vk1od.net/tx/concept/SpoilingClassB.htm-12/09/11 Transmitters 440Hz (A4, A440) reference oscillator Sun, 11 Sep 2011 00:00:00 +0000 http://vk1od.net/module/440HzRef/index.htm http://vk1od.net/module/440HzRef/index.htm-11/09/11 Hardware Return Loss Tue, 06 Sep 2011 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/rl.htm http://vk1od.net/transmissionline/VSWR/rl.htm-06/09/11 Transmission Lines Misunderstanding VSWR misleads Sat, 03 Sep 2011 00:00:00 +0000 http://vk1od.net/transmissionline/VSWR/mvm.htm http://vk1od.net/transmissionline/VSWR/mvm.htm-03/09/11 Transmission Lines G4CQM 50Ω coaxial dipole Fri, 02 Sep 2011 00:00:00 +0000 http://vk1od.net/antenna/G4CQM50Dipole/index.htm http://vk1od.net/antenna/G4CQM50Dipole/index.htm-02/09/11 Antennas Spotless days around solar cycle transition Sep11 Fri, 02 Sep 2011 00:00:00 +0000 http://vk1od.net/propagation/solar/spotless.htm http://vk1od.net/propagation/solar/spotless.htm-02/09/11 Propagation Calculate braid coverage Wed, 31 Aug 2011 00:00:00 +0000 http://vk1od.net/calc/BraidCover.htm http://vk1od.net/calc/BraidCover.htm-31/08/11 Software 137.7kHz oscillator Sun, 28 Aug 2011 00:00:00 +0000 http://vk1od.net/module/137700Osc/index.htm http://vk1od.net/module/137700Osc/index.htm-28/08/11 Transmitters 1kHz reference oscillator Sat, 27 Aug 2011 00:00:00 +0000 http://vk1od.net/module/1kHzRef/index.htm http://vk1od.net/module/1kHzRef/index.htm-27/08/11 Hardware Dipole loaded vertical coax feed line Sat, 13 Aug 2011 00:00:00 +0000 http://vk1od.net/antenna/dlv/index.htm http://vk1od.net/antenna/dlv/index.htm-13/08/11 Antennas Portable generator sets and RCD protection for Amateur Radio field stations Sun, 07 Aug 2011 00:00:00 +0000 http://vk1od.net/hardware/RCD/index.htm http://vk1od.net/hardware/RCD/index.htm-07/08/11 Hardware QRP2000 Synthesiser Fri, 05 Aug 2011 00:00:00 +0000 http://vk1od.net/hardware/Qrp2000/index.htm http://vk1od.net/hardware/Qrp2000/index.htm-05/08/11 Hardware DHL shipment performance Fri, 05 Aug 2011 00:00:00 +0000 http://vk1od.net/misc/DHL.htm http://vk1od.net/misc/DHL.htm-05/08/11 Miscellaneous Avoiding flashover in baluns and ATUs Tue, 05 Jul 2011 00:00:00 +0000 http://vk1od.net/transmissionline/aev/index.htm http://vk1od.net/transmissionline/aev/index.htm-05/07/11 Transmission Lines RX1 Noise Bridge improvement Wed, 22 Jun 2011 00:00:00 +0000 http://vk1od.net/measurement/NoiseBridge/RX1i.htm http://vk1od.net/measurement/NoiseBridge/RX1i.htm-22/06/11 Measurement Codan 7004 - WSPR 40m Mon, 20 Jun 2011 00:00:00 +0000 http://vk1od.net/rx/Codan7004/index.htm http://vk1od.net/rx/Codan7004/index.htm-20/06/11 Receivers Designing with the GI7BT Tue, 14 Jun 2011 00:00:00 +0000 http://vk1od.net/tx/GI7B/index.htm http://vk1od.net/tx/GI7B/index.htm-14/06/11 Transmitters Convert Vpk-Vrms-dBV-dBu-mW-dBm Sat, 11 Jun 2011 00:00:00 +0000 http://vk1od.net/calc/voltcnv.htm http://vk1od.net/calc/voltcnv.htm-11/06/11 Software Antenna Effective Aperture Sun, 05 Jun 2011 00:00:00 +0000 http://vk1od.net/antenna/concepts/Ae.htm http://vk1od.net/antenna/concepts/Ae.htm-05/06/11 Antennas Measuring RF impedance by the three voltmeter method Sat, 04 Jun 2011 00:00:00 +0000 http://vk1od.net/calc/z3vm.htm http://vk1od.net/calc/z3vm.htm-04/06/11 Measurement Measuring common mode current Mon, 30 May 2011 00:00:00 +0000 http://vk1od.net/measurement/icm/index.htm http://vk1od.net/measurement/icm/index.htm-30/05/11 Measurement Pi coupling a single ended valve RF Power Amplifier Sat, 28 May 2011 00:00:00 +0000 http://vk1od.net/tx/concept/pi.htm http://vk1od.net/tx/concept/pi.htm-28/05/11 Transmitters Calculate RF amplifier pi coupler Sat, 28 May 2011 00:00:00 +0000 http://vk1od.net/calc/pi.htm http://vk1od.net/calc/pi.htm-28/05/11 Software Designing with the GS31B Mon, 23 May 2011 00:00:00 +0000 http://vk1od.net/tx/GS31B/index.htm http://vk1od.net/tx/GS31B/index.htm-23/05/11 Transmitters Calculate initial load line of valve RF amplifier Sun, 22 May 2011 00:00:00 +0000 http://vk1od.net/calc/vlle.htm http://vk1od.net/calc/vlle.htm-22/05/11 Software Bowral 7MHz dipole for local contacts (updated) Sun, 22 May 2011 00:00:00 +0000 http://vk1od.net/antenna/7MDipole/7MDipole02.htm http://vk1od.net/antenna/7MDipole/7MDipole02.htm-22/05/11 Antennas Designing the operating point for a grounded grid Triode Class B RF amplifier Mon, 16 May 2011 00:00:00 +0000 http://vk1od.net/tx/concept/TriodeClassB/index.htm http://vk1od.net/tx/concept/TriodeClassB/index.htm-16/05/11 Transmitters Using my Excel cubic spline interpolation functions Fri, 07 May 2010 00:00:00 +0000 http://vk1od.net/measurement/ucs.htm http://vk1od.net/measurement/ucs.htm-07/05/10 Measurement A perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical Fri, 06 May 2011 00:00:00 +0000 http://vk1od.net/balun/application/Z5.html http://vk1od.net/balun/application/Z5.html-06/05/11 Baluns Comment on QEX article - "Coaxial Traps for Multiband Antennas, the True Equivalent Circuit" Mon, 02 May 2011 00:00:00 +0000 http://vk1od.net/antenna/coaxtrap/QexKom.htm http://vk1od.net/antenna/coaxtrap/QexKom.htm-02/05/11 Antennas A review of the Aoyue 937+ Sun, 17 Apr 2011 00:00:00 +0000 http://vk1od.net/misc/937+/937+.htm http://vk1od.net/misc/937+/937+.htm-17/04/11 Other Electronic fluorescent light starters Fri, 15 Apr 2011 00:00:00 +0000 http://vk1od.net/misc/ElectronicFlouroStarter.htm http://vk1od.net/misc/ElectronicFlouroStarter.htm-15/04/11 Other Heater Delay Timer Tue, 12 Apr 2011 00:00:00 +0000 http://vk1od.net/module/hdt2/index.htm http://vk1od.net/module/hdt2/index.htm-12/04/11 Hardware DTR - PTT interface adapter Sun, 10 Apr 2011 00:00:00 +0000 http://vk1od.net/tx/DtrPtt/index.htm http://vk1od.net/tx/DtrPtt/index.htm-10/04/11 Transmitters RX1 Noise Bridge - VK1OD build Fri, 08 Apr 2011 00:00:00 +0000 http://vk1od.net/measurement/NoiseBridge/RX1.htm http://vk1od.net/measurement/NoiseBridge/RX1.htm-08/04/11 Measurement QRZ forums Mon, 04 Apr 2011 00:00:00 +0000 http://vk1od.net/misc/QrzForums.htm http://vk1od.net/misc/QrzForums.htm-04/04/11 ARRL Noise Bridge worked example reworked Sun, 03 Apr 2011 00:00:00 +0000 http://vk1od.net/measurement/NoiseBridge/ArrlNoiseBridge.htm http://vk1od.net/measurement/NoiseBridge/ArrlNoiseBridge.htm-03/04/11 Measurement Generic noise bridge calculator Sat, 02 Apr 2011 00:00:00 +0000 http://vk1od.net/calc/nbc2.htm http://vk1od.net/calc/nbc2.htm-02/04/11 Software RX1, RX2 Noise bridge calculator Sat, 02 Apr 2011 00:00:00 +0000 http://vk1od.net/calc/nbc1.htm http://vk1od.net/calc/nbc1.htm-02/04/11 Software Definition: Current Balun, Voltage Balun Sat, 19 Mar 2011 00:00:00 +0000 http://vk1od.net/balun/concept/VoltageCurrent.htm http://vk1od.net/balun/concept/VoltageCurrent.htm-19/03/11 Baluns Baluns in antenna systems Mon, 20 Dec 2010 00:00:00 +0000 http://vk1od.net/balun/concept/cm/index.htm http://vk1od.net/balun/concept/cm/index.htm-20/12/10 Baluns Yaesu FL2100Z Thu, 25 Nov 2010 00:00:00 +0000 http://vk1od.net/tx/FL2100Z/index.htm http://vk1od.net/tx/FL2100Z/index.htm-25/11/10 Transmitters Folded Half Wave Dipole Sun, 24 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/FoldedDipole/index.htm http://vk1od.net/antenna/FoldedDipole/index.htm-24/10/10 Antennas Half Folded Half Wave Dipole Wed, 20 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/HalfFoldedDipole/index.htm http://vk1od.net/antenna/HalfFoldedDipole/index.htm-20/10/10 Antennas Tapping an air cored RF inductor Tue, 19 Oct 2010 00:00:00 +0000 http://vk1od.net/tx/concept/TappedCoil/index.htm http://vk1od.net/tx/concept/TappedCoil/index.htm-19/10/10 Transmitters StationMaster on 40m Fri, 15 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/StationMaster/40.html http://vk1od.net/antenna/StationMaster/40.html-15/10/10 Antennas Exploration of a design for an 80m vertical antenna - Part I Thu, 14 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/80mVertical/index.htm http://vk1od.net/antenna/80mVertical/index.htm-14/10/10 Antennas Counterpoise - what does it mean? Sun, 10 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/CounterPoise.htm http://vk1od.net/antenna/misc/CounterPoise.htm-10/10/10 Antennas A simple explanation of the so called current forcing property of a quarter wave transmission line Wed, 06 Oct 2010 00:00:00 +0000 http://vk1od.net/antenna/misc/CurrentForcingQW.htm http://vk1od.net/antenna/misc/CurrentForcingQW.htm-06/10/10 Antennas