Interference of electrical appliance in AM radio station,how can i eliminate this disturbance?
Answer:
Did you mean the "shshss..." sound? Its the unoccupied AM frequency. As AM is simpler and its sound quality is not very good, many broadcasting company had chosen FM to broadcast their program. That's why AM has many empty frequency. (It's only in Malaysia, I don't know about other country's)
The first question is how is the interference getting from the appliance to the radio - through the air or through power wiring. The fix is different for each case.
If it is coming through the air (into the antenna of the radio) then you need to add surpressor curcuitry to the appliance at the points where the signal is being broadcast from. A car engine (for example) would need small bypass capacitors to ground, and (perhaps) small inductance coils in series with the wires carrying the spark. You must surpress the radiating device.
If it is coming thru the electrical wiring, then you need to add supression circuitry to the powerline at the AM radio at the point the AC enters the radio. Most of the time a simple PI filter will work just fine, the capacitances should be several thousands ohms at 60 hz, and the series inductor should be only a few ohms at 60 hz..
One of the best sources of noise supression techniaues comes from the ARRL (American Radio Relay League) in publications for Amateur Radio operators.
There are quite a few commercial power line filters available, too. But radiated noise is a little harder to surpress sometimes because the source is not under your control. In this last case it is often effective to move the radio further away from the noise source (if that is possible)
Ron.
If I understand correctly, you are saying that while listening to your AM radio station, if you operate another electrical appliance it causes "electrical noise" to be heard over your radio. There's no easy solution for that problem. What I would suggest is to relocate your AM radio away from all electrical appliances. Maybe trying physically repositioning your radio (turn it in a different direction) when the interference is occurring in order to minimize the effects. FM radio broadcast might be your best and easiest solution.
Get a GOOD radio
exact answer frm rascal code. if it is coming frm air u need to suppresser with EMC filter and if it coming thru wired media u need Pi felter with capacitore paralel + inductor in series + capacitor in paralel. basicaly u need radio distortion filter also u hv to use mylar film capacitor across the recifier diode if interface is high and in pi filter it is advisable to use cl22 type film capacitor.
I think if radio is hundred percentage ok then u have to put some harmonic filter or power regulator on other devices to reduce noise.
in addition are u sure that this noise is electrical applieances only? in am radio ur wave direction should bein paralel or at right angle to the coil inside the radio (not sure). so first u chek that about setting and position then u go for filter in ur power supply and all.
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