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 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) MCU to load PLL configuration registers 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 revisedSpotless days around solar cycle transition Nov11 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 Noise Figure Meter (NFM) update - V1.11.0 Wed, 10 Aug 2011 00:00:00 +0000 http://vk1od.net/software/nfm/support.htm http://vk1od.net/software/nfm/support.htm-s-10/08/11 Software 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 BalunField Strength Calculator (FSC) update - V1.0.12 Wed, 02 Mar 2011 00:00:00 +0000 http://vk1od.net/software/fsc/support.htm http://vk1od.net/software/fsc/support.htm-s-02/03/11 Software Baluns 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