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Obviously i need to hunt around for the noise whats the best way to
track this down unf i don't have a spectrum analyzer See if the noise is present on a portable AM broadcast-band radio, if you tune the radio between stations. If so, you'll probably find that it's fairly directional - the loopstick antenna in a portable radio has reasonably deep nulls - and you can take bearings. MFJ sells a noise-hunting receiver, which uses a pair of telescoping whip antennas, and (if I recall correctly) an AM receiver tuned to the aircraft band at around 130 MHz. any tips appreciated because i can't realy use the lowbands anymore really annoying The first thing to do is determine whether the noise source is within your house or not. Easiest way to do this is to run your radio from a battery, and turn off the house's main circuit breaker. If the noise goes away, the source is local... if not, it's outside the house. What you're describing certainly sounds like the result of an electrical arc or switching of some sort. Some household devices which have been shown to cause this sort of intermittent noise have been things like electric-fence energizing systems, 12- and 24-volt battery chargers (solar or line-powered), fish-tank heaters, and even electric blankets. Industrial systems like electrical welders can do it, too. Another not-uncommon source is street lighting systems. Sodium- and mercury-vapor high intensity light systems can generate a lot of noise, especially if there are loose or corroded connections in their wiring or (I believe) if the bulbs are failing and the lights are cycling on and off. If you can track the noise with a portable AM radio, see if you can find a street or parking-lot lamp which is cycling on and off in synchronization with the noise. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
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