Editing VHF omnidirectional range (section)

===Constants===
{| class="wikitable"
|+ Standard<ref name="FRS2001"/> modulation modes, indices, and frequencies
|-align="center"
! Description
! Formula
! Notes
! Min
! Nom
! Max
! Units
|-align="center"
|rowspan="4" align="left"| ident
| rowspan="2"| ''i''(''t'')
| on || || 1 || ||
|-align="center"
| off || || 0 || ||
|-align="center"
| ''M''<sub>i</sub>
| align="left"|A1 modulation index || ||0.07|| ||
|-align="center"
| ''F''<sub>i</sub>
| align="left"|A1 subcarrier frequency|| ||1020|| ||Hz
|-align="center"
|rowspan="2" align="left"| voice
| ''a''(''t'')
| ||−1|| ||+1||
|-align="center"
| ''M''<sub>a</sub>
| align="left"|A3 modulation index || ||0.30|| ||
|-align="center"
|align="left"|navigation
| ''F''<sub>n</sub>
| align="left"|A0 tone frequency || ||30|| ||Hz
|-align="center"
|align="right"|variable
| ''M''<sub>n</sub>
| align="left"|A3 modulation index || ||0.30|| ||
|-align="center"
|rowspan="3" align="right"|reference
| ''M''<sub>d</sub>
| align="left"|A3 modulation index || ||0.30|| ||
|-align="center"
| ''F''<sub>s</sub>
| align="left"|F3 subcarrier frequency|| ||9960|| ||Hz
|-align="center"
| ''F''<sub>d</sub>
| align="left"|F3 subcarrier deviation|| || 480|| ||Hz
|-align="center"
|rowspan="2" align="left"|channel
| ''F''<sub>c</sub>
| align="left"|A3 carrier frequency||108.00|| ||117.95||MHz
|-align="center"
| ||align="left"|carrier spacing || 50|| || 50||kHz
|-align="center"
|align="left"|speed of light
| ''C'' || || ||299.79|| ||Mm/s
|-align="center"
|align="left"|radial azimuth
| ''A'' ||relative to magnetic north ||0 || ||359 ||deg
|}