HAM RADIO STATION OH8LQ

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HAM Projects

  • LDMOS amplifier HMI
  • 3 kW LDMOS linear amplifier
  • GU84 autotune amp
  • 80 m Shorty Yagi
  • Winkeyer + SO2R box
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  • 2x BLF188 HF-linear amps
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  • SONY WH-CH720N headset
  • BPF project
  • Relay box heater
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Nextion LDMOS amplifier GUI

Details
Written by: Jari Ojala
Category: Uncategorised
Published: 04 April 2025
Hits: 677

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The amplifier's user interface is a graphical touch screen.

All amplifier functions and settings are controlled via the screen.

 

 

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User main view.

 

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Bar graph of four FETs or current.

 

 

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 Bar graph of two FETs or current.

 

 

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Bar graph of a single FET or current.

 

 

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Usage history and settings selection.

 

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Band data, amount of the current bars, bar display max. limits.

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Selection of allowed bands and selection of additional input attenuation.

Nextion LDMOS amplifier GUI

Details
Written by: Jari Ojala
Category: Uncategorised
Published: 04 April 2025
Hits: 710

ScreenHunter_37.png

 

 

 

ScreenHunter_46.png

 

ScreenHunter_47.png

 

 

 

ScreenHunter_48.png

 

ScreenHunter_39.png

 

Relay box heater

Details
Written by: Jari Ojala
Category: Uncategorised
Published: 05 January 2025
Hits: 298

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BPF project

Details
Written by: Jari Ojala
Category: Uncategorised
Published: 05 January 2025
Hits: 334

 

BPF Project

 

Parallel resonance circuit

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BPF testing with a thermal camera!

 

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More information later in the future...

 

 

Input attenuator

Details
Written by: Jari Ojala
Category: Uncategorised
Published: 05 October 2024
Hits: 4652

 

 

 

Schema

BOM

Assembly

  1. SONY WH-CH720N headset
  2. Galvanic isolator (kalvanoitu erotin;))
  3. LDMOS RF-module
  4. LDMOS power switch

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VIDEO

  • Tower works at OH8LQ
  • Solder LDMOS
  • 42 m tower goes up
  • Ice droppin by drone PART I
  • Ice droppin by drone PART II
  • LDMOS amplifier GUI

Other projects

  • Solar power plant
  • 22 kW diesel generator project
  • Forest trailer
  • Harbor trailer

Presentations

  • LDMOS linear amplifiers (Finish)
  • SDR and CW Skimmer
  • OH Contests (kesäleiri 2022)