July 28, 2008

Interference on VK4RBC

The Mt. Coot-tha repeater, VK4RBC has been plagued by interference for as long as I can remember.  Usually the interference problems have been nothing more than annoying, but tonight it’s been particularly bad.

It appears that somewhere on Mt. Coot-Tha, someone is operating an illegal pair of cordless headphones, at a frequency of 433.525MHz (input frequency for VK4RBC).  Prior to tonight we knew something local was causing interference, but none of us could identify what.

Tonight however, the interference was particularly strong… so strong in fact, we could distinctly hear (although badly clipped) the audio being listened to via the headphones.  Thanks to the illegal broadcaster, we got to listen to the ABC News, and for the last hour, Channel 7.  It has subsided somewhat, but the interference is still there, and you do get the odd bit of a word.  No doubt the owners of these headphones will cop amateur interference whenever someone near them transmits.

A complaint has been sent to the ACMA, and I urge other radio amateurs inconvenienced by this interference to do the same.  I see no reason at all why we should put up with such severe interference.  LIPDs do not belong on 70cm!