# Documentation

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# helixpitch2spacing

Spacing between turns of helix

## Syntax

``s = helixpitch2spacing(a,r)``

## Description

example

````s = helixpitch2spacing(a,r)` calculates the spacing between the turns of a helix antenna given the pitch angle, `a`, and the radius of the helix, `r`.```

## Examples

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Calculate spacing for helix with pitch varying from 12 degrees to 14 degrees in steps of 0.5 and 20 mm radius.

`s = helixpitch2spacing(12:0.5:14,20e-3)`
```s = 0.0267 0.0279 0.0290 0.0302 0.0313 ```

Calculate spacing for helix with pitch varying from 12 degrees to 14 degrees in steps of 0.5 and radius 20 mm.

`s = helixpitch2spacing(12:0.5:14,20e-3)`
```s = 0.0267 0.0279 0.0290 0.0302 0.0313 ```

Calculate spacing of a helix that has a pitch of 12 degrees and a radius that varies from 20 mm to 22 mm in steps of 0.5 mm.

`s = helixpitch2spacing(12,20e-3:0.5e-3:22e-3)`
```s = 0.0267 0.0274 0.0280 0.0287 0.0294 ```

Calculate spacing for helix with pitch varying from 12 degrees to 14 degrees in steps of 0.5 and radius varying from 20mm to 22mm in steps of 0.5.

`s = helixpitch2spacing(12:0.5:14,20e-3:0.5e-3:22e-3)`
```s = 0.0267 0.0286 0.0305 0.0324 0.0345 ```

## Input Arguments

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Pitch angle of helix, specified as a scalar or vector in meters.

Example: 12:0.5:14

Radius of helix, specified as a scalar or vector in meters.

Example: 20e-3

### Note

If the pitch angle and radius are both vectors, then their lengths must be equal.

## Output Arguments

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Spacing between helix turns, returned as a scalar or vector in meters.