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Spin South West -v- Today Fm

  • 08-09-2011 9:47am
    #1
    michie83
    Closed Accounts Posts: 1 ✭


    anyone in Kerry/Cork trying to listen to Today Fm and Spin South West butting in?? Second time this week its happened! At 9.30 both times


Comments

  • #2
    Antenna
    Registered Users, Registered Users 2 Posts: 2,332 ✭✭✭Antenna


    michie83 wrote: »
    anyone in Kerry/Cork trying to listen to Today Fm and Spin South West butting in?? Second time this week its happened! At 9.30 both times

    All 6 national FM stations from Mullaghanish were switched off for 2 1/2 hour blocks during mornings and afternoons for a few days last week for mast work between

    9:30am and midday
    and again in the afternoon from 2pm until 4:30pm.

    Some RDS car radios if left in 'TP' (traffic announcements) mode will jump on to another station when there is no reception of the station you had been listening too.


  • #3
    More Music
    Registered Users, Registered Users 2 Posts: 873 ✭✭✭More Music


    I'll try to explain what's going on here.

    You were tuned in to Today FM from Knockmoyle on 100.2 and was hearing what sounded like Spin SW interfering with them. What you were actually hearing is the Today FM transmitter broadcasting local interference.

    All national stations (except Newstalk) broadcasting from Knockmoyle are just refeeds of Mullaghanish. So if Today FM on 101.8MHz from Mullaghanish goes off, so too does Today FM from Knockmoyle.

    The receiver in Knockmoyle should mute when the Mullaghanish transmitter goes off, and you should just be hearing silence (dead air) in the Tralee area. So the Knockmoyle transmitter is on but not broadcasting any audio as the receiver should be muted. This is the case with the RTE stations, the receive threshold is set correctly and mutes the receiver.

    However, in the case of Today FM their receiver isn't muting as it's picking up some local interference which includes intermodulation of Spin SW and some other station. The result is Today FM on 100.2 actually relaying the interference themselves which sounds like a radio not tuned in correctly. A filter on the receiver antenna input should fix it.

    When Mullaghanish is off air there is no RDS broadcast from Knockmoyle as the receiver is also relaying RDS data.


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