Last updated: 2021, August 2 11:48:16
Total pages: 3129 owenduffy.net Homepage

• /3 pages
• • module/
  • • 137700Osc/2 pages
    • 137700.hex
    • QrssTx/3 pages
    • QRP QRSS Beacon Transmitter - on air
    • QRSS observation utilities
    • QRP QRSS Beacon Transmitter
    • rb/4 pages
    • Roger Beep
    • Roger Beep - tone waveform development
    • Roger Beep - older firmware versions
    • Roger Beep - kit contents and construction notes
    • • SM8/1 page
      • Roger Beep - SM8 installation notes
      • IC7000/2 pages
      • Roger Beep - IC7000 + HM-151 installation notes
      • Roger Beep - IC7000 + Traveller headset installation notes
      • IC910/1 page
      • Roger Beep - IC910 installation notes
      • MC80/1 page
      • Roger Beep - MC80 installation notes
      • TS2000/1 page
      • Roger Beep - TS2000 installation notes
      • Codan8528/1 page
      • Roger Beep - Codan 8528 installation notes
    • CpldPll/1 page
    • An experimental CPLD based PLL
    • ic9350/1 page
    • Icom - 9350 / 3040 Protocol Converter (ic9350)
    • dc/2 pages
    • 12V DC distribution in car for radio applications - 2005
    • Anderson Power Poles for 12VDC radio applications
    • PepAmp/5 pages
    • Peak amplifier for an RF wattmeter
    • Peak amplifier for Drake W4 directional wattmeter
    • Peak amplifier for Bird 43 coupler directional wattmeter by F6DFZ
    • PeakAmp.xls
    • PeakAmpSchematic.pdf
    • hdt/1 page
    • Heater Delay Timer
    • EA78Accukeyer/1 page
    • EA 1978 Accu-keyer improvements
    • crd/1 page
    • Coax Relay Driver
    • SoundCardPreamp/2 pages
    • Sound card microphone preamplifier
    • SoundCardPreAmpDesign.xls
    • TuneMate/4 pages
    • TuneMate for Icom transceivers
    • icah4e002.pdf
    • icah4e001.pdf
    • icah4e-510-1.10.hex
    • pik/5 pages
    • PIK - PIC Iambic Keyer
    • PIK - PIC Iambic Keyer
    • pik011.pdf
    • PIK timing
    • pik001.pdf
    • • VK3XU/1 page
      • VK3XU's PIK with integral iambic paddles
    • rpi/2 pages
    • Radio Programming Interface
    • rpipanel.pdf
    • TncAudioBob/1 page
    • TNC Audio Break-Out-Box
    • Echolink/1 page
    • Echolink interface unit
    • SpkrHiPass/1 page
    • High Pass speaker filter for CTCSS suppression
    • g2c/1 page
    • GPIB to Centronics Protocol Converter
    • SCAmmeter/1 page
    • Silicon Chip Automotive Ammeter (June 2002) - mods
    • PhoneFilter/1 page
    • Simple RF filter for telephone line
    • mdmrst/1 page
    • Mdmrst
    • HAPN/1 page
    • Fitting a HAPN 4800 board to a Paccomm Tiny 2 Mk II
    • FlashTnc/2 pages
    • Flash TNC
    • flashtncartwork.pdf
    • VkPowermate/1 page
    • VKPowermate II
    • AH4-AT300/1 page
    • AH4-AT300 Protocol Converter
    • hdt2/1 page
    • Heater Delay Timer
    • 1kHzRef/2 pages
    • 1kHz reference oscillator
    • 1kHzRef.hex
    • 137.700Beacon/1 page
    • 137.7kHz QRSS on one chip
    • • files/1 page
      • QRSS137-t25.hex
    • 440HzRef/2 pages
    • 440Hz (A4, A440) reference oscillator
    • 440HzRef.hex
    • PllLdr/3 pages
    • MCU to load PLL configuration registers
    • PllLdr - EEPROM data structure
    • Synthesisers and external reference clocks
    • • cs01/1 page
      • PllLdr application - AD9850
      • cs02/1 page
      • PllLdr application - AD9850/51 300Bd FSK
      • cs03/1 page
      • PllLdr application - BH1415F
      • Picaxe/1 page
      • Picaxe PLL loaders
      • files/2 pages
      • PllLdr.hex
      • PllLdr-tx5.hex
      • cs04/1 page
      • PllLdr application - Si4133G (VK3XDK Agile PLL)
      • cs05/1 page
      • PllLdr application - Si4133GT (VK3XDK Agile PLL V2)
      • cs07/1 page
      • PllLdr application - AD9833
      • cs08/3 pages
      • PllLdr application - ATTiny44 & AD9833 in Codan 6801
      • PllLdr2 application - Nano & AD9833 in Codan 6924
      • AD9833-2007.xls
    • DtrRtsInterface/1 page
    • DTR / RTS interface unit
    • smbk/9 pages
    • Simple Morse beacon keyer
    • Improving weak signal identification of FSK beacons
    • Another simple Morse beacon keyer - basic, but accurate
    • Simple Morse beacon keyer - using ATB
    • Simple Morse beacon keyer - EEPROM data structure
    • Another Morse beacon keyer - A/B RF switching
    • Morse beacon keyer for a cluster of transmitters
    • Simple Morse beacon keyer - onair
    • Another Morse beacon keyer - Nano hardware
    • • files/4 pages
      • QrssBeacon-m168.hex
      • QrssBeacon-tx4.hex
      • QrssBeacon-tx5.hex
      • QrssBeacon-tx5x.hex
    • ESR/1 page
    • Anatek ESR Meter - VK1OD implementation
    • RfCurrentSampler/1 page
    • RF current sampler
    • atpa/1 page
    • AVR ATTiny programming adapter
    • K3ngKeyer/1 page
    • RS232 Morse keyer
    • gpsppsu/1 page
    • GPS PPS Utility (gpsppsu)
    • • files/7 pages
      • gpsppsu.hex
      • tn25.hex
      • tn45.hex
      • tn85.hex
      • 8MHz.hex
      • 10MHz.hex
      • 12.8MHz.hex
    • hwpt/1 page
    • Hand wound power transformers
    • ArduinoThermometer/1 page
    • Arduino thermometer - a tutorial
    • hcctl/1 page
    • Generic heating / cooling controller
    • parot/1 page
    • Power Amplifier Run On Timer (PAROT)
    • • files/3 pages
      • parot.hex
      • 10s.parot
      • 180s.parot
    • ArduinoRTC/1 page
    • Arduino Real Time Clock - a tutorial
    • ArduinoMag/1 page
    • Arduino Magnetometer - a tutorial
    • PA0KLTSynth/1 page
    • PA0KLT Si570 Synthesiser - VK1OD implementation
    • ArduinoStepper/1 page
    • Arduino stepper motor driver - a tutorial
    • icm/2 pages
    • Measuring common mode current
    • Icm40.pdf
    • PllLdr2/1 page
    • PllLdr2 is a port of PllLdr to Arduino Pro hardware (inc Nano, Promini)
    • • files/2 pages
      • optiboot_atmega328E.hex
      • PllLdr2.hex
  • hardware/
  • • Qrp2000/1 page
    • QRP2000 Synthesiser
    • genset/1 page
    • A medium priced generator set from eBay
    • MI5104/1 page
    • Jaycar MI5104 inverter
    • apfpm/1 page
    • Acrylic plinth for small card modules
  • map/8 pages
  • 20160204
  • VK4MQ+VK2OL-2015
  • 20160630
  • 20151028
  • 20151029
  • 20160305
  • 20160111
  • AprsDup2