Editing Multi-Use Radio Service (section)

== Frequencies ==
MURS comprises the following five [[Frequency|frequencies]]:

{| class="wikitable"
|-
! Channel
! Frequency
! Maximum<br />authorized bandwidth
! Channel name
|-
| 1
| 151.82 [[Hertz|MHz]]
| 11.25&nbsp;[[Hertz|kHz]]
|MURS 1
|-
| 2
| 151.88&nbsp;MHz
| 11.25&nbsp;kHz
|MURS 2
|-
| 3
| 151.94&nbsp;MHz
| 11.25&nbsp;kHz
|MURS 3
|-
| 4
| 154.57&nbsp;MHz 
| 20.00&nbsp;kHz
| [[Business band#VHF frequencies|Blue Dot]]
|-
| 5
| 154.60&nbsp;MHz 
| 20.00&nbsp;kHz
| [[Business band#VHF frequencies|Green Dot]]
|}

Channels 1–3 must use "narrowband" [[frequency modulation]] (2.5&nbsp;kHz [[Frequency deviation|deviation]]; 11.25&nbsp;kHz bandwidth). Channels 4 and 5 may use either "wideband" FM (5&nbsp;kHz deviation; 20&nbsp;kHz bandwidth) or "narrowband" FM.<ref>{{CodeFedReg|47|95|2773}}</ref>  All five channels may use [[amplitude modulation]] with a bandwidth up to 8&nbsp;kHz.<ref>{{CodeFedReg|47|95|2773|c}}</ref>  MURS falls under part 95 and was not mandated for narrow-banding, such as those of Part 90 in the public service bands by January 2013.

Because previous business band licensees who have maintained their active license remain [[Grandfather clause|grandfathered]] with their existing operating privileges, it is possible to find repeaters or other operations not authorized by Part 95 taking place. These are not necessarily illegal. If legal, such operations may enjoy primary status on their licensed frequency and as such are legally protected from harmful interference by MURS users.<ref name="95.1317">{{CodeFedReg|47|95|1317}}</ref>

[[File:HorizonDistance3.jpg|thumb|alt=Line of Sight to the horizon|Calculating the horizon distance based on antenna height]]