DIT DOTS KO6ETZ HAM RADIO • ELECTRONICS • SOFTWARE 14.074 MHz TX PWR RX
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Sorin Marghitoiu, KO6ETZ

Software Engineer · Consultant · Ham Radio · Indie Developer

I build radio control software, audio visualizers, and hardware projects, then put them all here. Over 20 years as a software engineer, including 17 years managing USC’s CiSoft lab and 7 as a Chevron consultant.

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Apps & Software

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ShackLink Server SDR display with 3D waterfall

ShackLink Suite

Free Windows Mobile Web

Control your ham radios from anywhere. Server with Morse/RTTY/PSK31/SSTV decoders, plus desktop, mobile, web, and Home Assistant clients.

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3D glass bars audio visualization

Stereo Spectrum Analyzer

$4.99 Windows Android iOS

40+ audio-reactive visualizations, built-in music player, 30,000+ internet radio stations, and a shader sandbox.

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Intimate Connection dashboard showing mood matching between partners

Intimate Connection

$4.99 iOS Android Windows

Private mood-sharing for couples. AES-256-GCM encrypted, local WiFi only. No servers, no accounts, no data harvesting.

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From the Workbench

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Panasonic RAMSA meter bridge with its LED columns lit as a spectrum analyzer

RAMSA Meter Bridge

A 390-LED meter bridge from Panasonic’s 1998 RAMSA WR-DA7 console, brought back to life as a spectrum analyzer for whatever the PC is playing.

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RF Bench Analyser main window with the 3-D terrain waterfall of the 20 m demo band

RF Bench Analyser

A spectrum analyser front panel for the whole bench: a Rohde & Schwarz CMU200, a tinySA, an oscilloscope, a NanoVNA and a rack of SDRs behind one window, with measurement windows, a network analyser and a transmitter and receiver test bench.

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ShackLink Knob tuned to 104.700 MHz WFM, showing a live HackRF spectrum and waterfall

ShackLink Knob

A ShackLink client you hold in one hand: a real tuning knob and a round touch screen with live spectrum, waterfall, 48 shared memories, and station audio in your headphones.

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Petroleum Software

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Decline Analysis showing a fitted harmonic decline curve over a multi-series well production history

Decline Analysis

Fits exponential, harmonic and hyperbolic decline curves to irregular well production histories, driving scipy differential evolution from a VB.NET front end.

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Voronoi Diagram Generator showing a distance heat map over point and line-segment seeds

Voronoi Drainage Engine

Weighted and line-segment Voronoi diagrams for drainage and catchment areas, one tested core running on the desktop and in the browser via WebAssembly.

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Interwell Connectivity prediction tab showing per-producer influence decomposed by injector

Interwell Connectivity

Quantifies which injector feeds which producer across a waterflood, using an FIR capacitance model behind an eight-project multi-tier .NET platform.

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What I’m Working On

Last updated: July 2026

  • Shipped Stereo Spectrum Analyzer v2: 40+ visualizations, built-in player, internet radio, SKSL shader sandbox, network media browsing.
  • Shipped Spectra Media Player: Mobile version for Android & iOS with 37+ visualizations, 62 shader presets, and molecule structures from PubChem.
  • Active ShackLink SSTV decoder: Adding support for Robot, Martin, Scottie, PD, Wraase, and Pasokon modes.
  • Ongoing ShackLink Suite: Ongoing development of the remote radio-control ecosystem: server, decoders, SDR features, and desktop, mobile, web, and Home Assistant clients.
  • Ongoing Lumea Vidă translation: Translating my father’s philosophical treatise “The Void World” from Romanian to English. ~9% complete.