HamTools DL1DRK
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DL1DRK

Tools, calculators and simulations for radio and technology.

A compact collection of practical helpers for amateur radio, radio technology, BOS radio, electronics, web projects and tinkering.

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Current Tools

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Amateur radio

APRS Passcode Generator

Calculates the APRS-IS passcode from an amateur radio callsign.

APRS Callsign Passcode
Calculator

Hex ↔ Dec Converter

Converts hexadecimal and decimal numbers quickly in both directions.

Hex Decimal Converter
Radio technology

Frequency Calculator

Calculates wavelength, lambda/2 and lambda/4 values from a frequency.

Frequency Wavelength Antenna
Amateur radio

Locator Finder

Determines your Maidenhead locator from your current location.

Locator Maidenhead Location
BOS radio

BOS Channel Calculator

Calculates lower-band and upper-band frequencies from an analog BOS channel number.

BOS Channel Frequency
Radio operation

Spelling Helper

Converts text into the German or NATO spelling alphabet.

Spelling NATO Radio

Simulations

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Display simulation

7-Segment Display

Simulates a single 7-segment display for digits, letters and simple special characters.

7-segment Display Simulation
Display simulation

LCD Display

Simulates a classic 16x2 character LCD with per-line alignment.

LCD 16x2 Display
Display simulation

8x8 Dot Matrix

Simulates scrolling text on one or four 8x8 dot-matrix modules.

Dot matrix Scrolling text LED