Interference to 144.100Mhz to 144.240Mhz Concord NSW
Posted: Tue Dec 22, 2015 9:04 am
G'day All,
Had an interesting interference problem to the low end of 2 meters in Concord NSW. The interference was in the form of an unmodulated carrier that over a period of 7 days slowly drifted from 144.100Mhz to 144.240Mhz, then resets back to 144.100Mhz. The received signal strength was -93dBm (S9). This carrier had a fast worble like FSK sound when listened to with a BFO and a slight hum on FM mode. This carrier was on 24/7. Apart from the slow drift was a stable carrier with a narrow bandwidth.
Using standard DF techniques I quickly located the source of this interference as emanating from a house in the next street.
The interfering device was found to be an overheating Foxtel Modem. This was switched off and a replacement modem install a few days later. No further interference has been received since. I'm ready for the Troppo season now.!!!!
Chris
Had an interesting interference problem to the low end of 2 meters in Concord NSW. The interference was in the form of an unmodulated carrier that over a period of 7 days slowly drifted from 144.100Mhz to 144.240Mhz, then resets back to 144.100Mhz. The received signal strength was -93dBm (S9). This carrier had a fast worble like FSK sound when listened to with a BFO and a slight hum on FM mode. This carrier was on 24/7. Apart from the slow drift was a stable carrier with a narrow bandwidth.
Using standard DF techniques I quickly located the source of this interference as emanating from a house in the next street.
The interfering device was found to be an overheating Foxtel Modem. This was switched off and a replacement modem install a few days later. No further interference has been received since. I'm ready for the Troppo season now.!!!!
Chris
