M0UKD - Amateur Radio Blog
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      • 70MHz Quarter Wave Ground Plane Antenna
      • 144MHz 2m Portable Yagi VHF Beam Antenna
      • Magnetic Loop Antennas
      • Homemade Carolina Windom antenna
      • Homemade 20 metre band loft dipole!
    • Baluns and UnUns
      • End Fed Half Wave Antenna Coupler (EFHW)
      • 1:1 Voltage Balun for HF wire dipoles
      • 9:1 Magnetic Longwire Balun / Unun
    • Simple CW Touch Keyer Circuits
    • Capacitive CW Touch Key Circuits
    • 2N6084 144MHz FM Power Amplifier
    • G3XBM 472kHz Transverter
    • Rig to Soundcard Interface
    • PIC controlled 500w ‘Modified Sine Wave’ Inverter
    • Alkaline battery charging circuit
  • Calculators
    • Slim Jim and J Pole calculator
    • 1/4 Wave Ground Plane Antenna Calculator
    • Ohms Law Calculator
    • dBm, dBW, µW, mW, Watt, KW and MW Calculator
    • Loaded Quarter Wave Antenna Inductance Calculator
    • ERP & EIRP Calculator
    • Resonant Frequency Calculator
    • PI attenuator calculator
    • T attenuator calculator
    • Air Cored Inductor Calculator
    • Inverted Vee Antenna
    • Parallel Resistor, Inductor or series capacitor calculator
    • Electricity cost calculator kW/h
  • Mods
    • Yaesu MH-31 Electret Condenser Mic Modification
    • MFJ-971 Portable Antenna Tuner Modifications
    • Icom IC-7200 SO-239 to N-Type Socket
  • Reviews
    • Manson SPS-9400 40A 3-15V Switchmode Power Supply
  • Other Stuff
    • Printable Amateur Radio Logbooks
    • Useful information on Lead Acid Batteries
    • Web Server Network Usage
    • Server Info
  • My Logbook
  • Contact Me

Mods

Just a couple of tweaks to commercial amateur radio equipment.

  • Yaesu MH-31 Mic Mod – Replacing the standard dynamic mic element with an electret condenser element.
  • MFJ-971 ATU Mods – Adding a tune/bypass switch and extra inductance for 160m.
  • Icom IC-7200 SO-239 to N-Type Socket – Changing the SO-239 to a decent connector!

Recent Posts

  • International Space Station NA1ISS contact with GB4YOTA
  • Building a 70MHz quarter wave ground plane
  • Receiving SSTV images from the ISS – ARISS 20th Anniversary
  • 1/4 Wave Antenna Calculator
  • A long break…
  • My first 23cm 1297MHz contact!
  • Icom IC-7100 SO-239 to N-Type
  • Reviews
  • RSGB 21/28MHz Contest
  • Practical Wireless 70MHz Contest
  • RSGB 2nd 70MHz Contest
  • Two years in the making – 70MHz 300w Amplifier
  • 5th 144MHz Backpackers Contest
  • Update to Slim Jim calculator
  • Working Happisburgh Lighthouse on 70MHz

Recent Comments

  • John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator
  • KK5VN on Slim Jim and J Pole calculator
  • yimbo on Slim Jim and J Pole calculator
  • Paul larner on Loaded Quarter Wave Antenna Inductance Calculator
  • Paul, KB1NCD on 1:1 Voltage Balun for HF wire dipoles

Site Map

  • Home
    • Portable Operating
    • Contests
    • Technical
    • Construction
    • Satellite Operations
    • Special Events
  • About Me
  • Homebrew
    • Antennas
      • 70MHz Quarter Wave Ground Plane Antenna
      • 144MHz 2m Portable Yagi VHF Beam Antenna
      • Magnetic Loop Antennas
      • Homemade Carolina Windom antenna
      • Homemade 20 metre band loft dipole!
    • Baluns and UnUns
      • End Fed Half Wave Antenna Coupler (EFHW)
      • 1:1 Voltage Balun for HF wire dipoles
      • 9:1 Magnetic Longwire Balun / Unun
    • Simple CW Touch Keyer Circuits
    • Capacitive CW Touch Key Circuits
    • 2N6084 144MHz FM Power Amplifier
    • G3XBM 472kHz Transverter
    • Rig to Soundcard Interface
    • PIC controlled 500w ‘Modified Sine Wave’ Inverter
    • Alkaline battery charging circuit
  • Calculators
    • Slim Jim and J Pole calculator
    • 1/4 Wave Ground Plane Antenna Calculator
    • Ohms Law Calculator
    • dBm, dBW, µW, mW, Watt, KW and MW Calculator
    • Loaded Quarter Wave Antenna Inductance Calculator
    • ERP & EIRP Calculator
    • Resonant Frequency Calculator
    • PI attenuator calculator
    • T attenuator calculator
    • Air Cored Inductor Calculator
    • Inverted Vee Antenna
    • Parallel Resistor, Inductor or series capacitor calculator
    • Electricity cost calculator kW/h
  • Mods
    • Yaesu MH-31 Electret Condenser Mic Modification
    • MFJ-971 Portable Antenna Tuner Modifications
    • Icom IC-7200 SO-239 to N-Type Socket
  • Reviews
    • Manson SPS-9400 40A 3-15V Switchmode Power Supply
  • Other Stuff
    • Printable Amateur Radio Logbooks
    • Useful information on Lead Acid Batteries
    • Web Server Network Usage
    • Server Info
  • My Logbook
  • Contact Me
Tweets by @M0UKD

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