|
|
|
www.southgatearc.org
|
Persistence and direction finding pays offIn New Zealand, a recent interference problem at a land mobile site in the Blenheim area involved Radio Spectrum Management (RSM) staff chasing a rogue signal for several hours.The signal was only able to be heard by RSM staff at two widely separated hill top sites using a high gain antenna and an amplifier. Two direction finding bearings were enough to give a map location for the faulty mast head TV amplifier. It was tracked down on the western side of Blenheim before it got dark. RSM has located several spurious mast head TV amplifiers in the last year and reminds industry to use low gain amplifiers and to install TV systems with quality splitters and terminations. Direction-finding can even be used to identify interfering stations on the other side of the world. In a separate case this month, a licensee using a frequency around 7MHz complained of interference on their service. With the co-operation of the ACMA direction finding service in Australia, the interfering signal was identified as a time signal station which had recently come on to the frequency in Ottawa, Canada. Negotiations are being held between administrations as to how to overcome the interference issue.
Related link to RSM's interference location techniques for commercial interference
Source: MED, New Zealand
|
|
|||||||||||||||||
|
|
|
