Get-AntennaLength.ps1
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function Get-AntennaLength { <# .SYNOPSIS Calculates the required length of an antenna for a given radio frequency. .DESCRIPTION You submit the frequency (in Megahertz) and get back resonant antenna lengths that you can use for senders and receivers operating on this frequency. .EXAMPLE Get-AntennaLength -Frequency 433.95 Returns the lengths for an antenna that resonate on 433.95MHz. .LINK https://done.land/tools/powershell #> [CmdletBinding(DefaultParameterSetName='ForwardVoltage')] param ( # the frequency in megahertz that you want to transmit or receive [Parameter(Mandatory,ValueFromPipeline)] [double] $Frequency ) begin { $speedOfLight = 299792458 } process { $lambda = $speedOfLight / ($Frequency * 1000000) * 100 [PSCustomObject]@{ 'Frequency (MHz)' = $Frequency Lambda = [Math]::Round($lambda,1) 'Lambda 7/8 (cm)' = [Math]::Round($lambda * 7 / 8,1) 'Lambda 5/8 (cm)' = [Math]::Round($lambda * 5 / 8,1) 'Lambda/2 (cm)' = [Math]::Round($lambda/2,1) 'Lambda/4 (cm)' = [Math]::Round($lambda/4,1) 'Lambda/8 (cm)' = [Math]::Round($lambda/8,1) } } } |