Contrary to popular belief, the ARINC 424 specification is . It is a copyrighted technical standard managed by SAE ITC (formerly ARINC). Here is how to legally obtain the PDF:
The primary role of ARINC 424 is to ensure that every pilot and every aircraft is working from the same "source of truth." navigation database coding - ICAO arinc 424 specification pdf
Look for Record Type 2 (VOR). According to the PDF: Contrary to popular belief, the ARINC 424 specification is
Understanding this matrix is impossible without the official PDF diagrams. Contrary to popular belief