Penfold Posted April 23, 2013 Posted April 23, 2013 I'm having issues with using multiple's (6) of the Sennheiser XSW lavalier series together - all on CH38, Licenced and using the Sennheiser recommended frequencies.If all 6 are powered up it's fine, but turn any one off and interference appears on the others in the form of loud hissing.They are being used in close proximity to the receivers - about 6 feet away. Could this be too close? Or is there another problem I'm missing? Thanks in advance for any help!
david.elsbury Posted April 23, 2013 Posted April 23, 2013 Sounds like its too close to work properly - overloading the RF input stage. Are you using any antenna amplifiers or DA?
Penfold Posted April 23, 2013 Author Posted April 23, 2013 No, they are racked in 2's using the Sennheiser kits to mount the standard 1/4 wave antenna on the front.
Shez Posted April 23, 2013 Posted April 23, 2013 The absence of a transmitter causing interference on other's channels is a little puzzling. I'd also certainly suggest increasing the distance between transmitters and receivers - six feet is a little closer than ideal.
Penfold Posted April 26, 2013 Author Posted April 26, 2013 Update - Moved the receivers to the rear of the auditorium and all problems disappeared! Thanks everyone.
Bazz339 Posted April 26, 2013 Posted April 26, 2013 Is the squelch or mute sensitivity adjustable on the receiver?
Rob_Beech Posted April 29, 2013 Posted April 29, 2013 This is pretty common. Sennheiser refer to it in the manual as overmodulating, although this term is a bit inaccurate. On the Sennheiser stuff it's cured simply by turning on the other TX. Though on some Shure stuff, a large deviation in signal strength can cause alsorts of problems. It's emphasised with directional antenna where gain is applied. In simple terms as others have mentioned. One TX is being picked up very close and more than one RX (USUALLY ones on a closer frequency) are picking up nastiness. Moving further away will cure this, as will turning on the other TX so the RX knows what it's looking for so to speak. Whilst they're only simplex they do tend to "lock on" to the correct signal. Turning up the Squelch doesn't always fix this as the signal can be fairly strong, and the pilot tone is the same thus bringing the mic out of "mute". Rob
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