http://vk1od.net/software VK1OD software news en-us webmaster@vk1od.net (webmaster) webmaster@vk1od.net (webmaster) Owen Duffy http://vk1od.net http://www.vk1od.net/Vk1odOnTheNet.jpg Thinking aloud on pipe cap filters High frequency compensation of T/R relay The merit of measuring VSWR on an open wire line VK2WI AM broadcast on 7.146MHz - quality issues Synthesisers and external reference clocks Australian amateur population trends 1998 - 2011 Anatek ESR Meter - VK1OD implementation Terminating a single core hard wire on an insulator MCU to load PLL configuration registers update PllLdr application - BH1415F dB, dBi, and dBdField Strength Meter (FSM) update - V1.5.0 Tue, 13 Mar 2012 00:00:00 +0000 http://vk1od.net/software/fsm/support.htm http://vk1od.net/software/fsm/support.htm-s-13/03/12 Software 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-s-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-s-13/03/12 Software Effect of reduced drive on Class B amplifier efficiencySpotless days around solar cycle transition Feb12 Comment on W8JI's 2006 coil measurement experiment Are RF toroidal inductors self shielding Balanced ATUs and common mode current A worked example of a Bird 43 with a grossly mismatched load Thunderbolt GPS Disciplined Oscillator - VK1OD implementation 137.7kHz QRSS on one chip (revised 3/2/12) Improving weak signal identification of FSK beacons Simple Morse beacon keyer Effective Radiated Power (ERP) Jaycar MI5104 inverter DTR / RTS interface unit Insertion Loss vs Transmission Loss Adjusting a loaded HF vertical PllLdr application - AD9850/51 300Bd FSK ZL1AN's transmission line challenge Setup of an FM AFSK transmitter APRS AFSK on VHF PllLdr application - AD9850 Is the 133' centre fed multiband dipole a no-brainer 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-s-26/12/11 Software N0XAS ID-O-Matic - VK1OD implementation A medium priced generator set from eBay An experimental CPLD based PLL (revised) Comment on W5DXP's 2011 coil measurement experiment Exploitation of NEC's GM card T Match efficiency estimator Sat, 12 Nov 2011 00:00:00 +0000 http://vk1od.net/calc/tmee.htm http://vk1od.net/calc/tmee.htm-s-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-s-12/11/11 Software PA0KLT Si570 Synthesiser - VK1OD implementation Matching a 5/8λ verticalIn pursuit of dipole resonance with an MFJ259B revised Is Zs of a HF ham tx typically 50+j0? A test of Zs on an IC7000 Link coupling transformation ratio (expanded 29/10/11) Learning models or a poor workman always blames his tools Bootstrap coax traps for antennas (expanded 10/11) Differential flux leakage in a Guanella 1:1 balun ATLLC Examples Mon, 10 Oct 2011 00:00:00 +0000 http://vk1od.net/calc/tl/atllcEx.htm http://vk1od.net/calc/tl/atllcEx.htm-s-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-s-09/10/11 Software Estimating parameters of two wire transmission lines Noise bridge measurement case study - Bowral dipole Noise bridge measurement case study - shortened vertical monopole matching Filament Management in Amateur Radio applications Does twisting a two wire open line reduce radiation Can a balun alter the tuning of an antenna system Spoiling Class B 440Hz (A4, A440) reference oscillator Return Loss Misunderstanding VSWR misleads G4CQM 50Ω coaxial dipoleSpotless days around solar cycle transition Sep11 Calculate braid coverage Wed, 31 Aug 2011 00:00:00 +0000 http://vk1od.net/calc/BraidCover.htm http://vk1od.net/calc/BraidCover.htm-s-31/08/11 Software 137.7kHz oscillator 1kHz reference oscillator Dipole loaded vertical coax feed line Portable generator sets and RCD protection for Amateur Radio field stations QRP2000 Synthesiser DHL shipment performance Avoiding flashover in baluns and ATUs RX1 Noise Bridge improvement Codan 7004 - WSPR 40m Designing with the GI7BTConvert 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-s-11/06/11 Software Antenna Effective ApertureMeasuring RF impedance by the three voltmeter method Measuring common mode currentPi coupling a single ended valve RF Power AmplifierCalculate RF amplifier pi coupler Sat, 28 May 2011 00:00:00 +0000 http://vk1od.net/calc/pi.htm http://vk1od.net/calc/pi.htm-s-28/05/11 Software Designing with the GS31BCalculate 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-s-22/05/11 Software Bowral 7MHz dipole for local contacts (updated) Designing the operating point for a grounded grid Triode Class B RF amplifierUsing my Excel cubic spline interpolation functionsA perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical Comment on QEX article - "Coaxial Traps for Multiband Antennas, the True Equivalent Circuit"A review of the Aoyue 937+Electronic fluorescent light startersHeater Delay TimerDTR - PTT interface adapterRX1 Noise Bridge - VK1OD buildQRZ forumsARRL Noise Bridge worked example reworkedGeneric noise bridge calculator Sat, 02 Apr 2011 00:00:00 +0000 http://vk1od.net/calc/nbc2.htm http://vk1od.net/calc/nbc2.htm-s-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-s-02/04/11 Software Definition: Current Balun, Voltage BalunBaluns in antenna systemsYaesu FL2100ZFolded Half Wave DipoleHalf Folded Half Wave DipoleTapping an air cored RF inductorStationMaster on 40mExploration of a design for an 80m vertical antenna - Part ICounterpoise - what does it mean?A simple explanation of the so called current forcing property of a quarter wave transmission line