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AM Radio

 
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AM Radio
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STeve
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Post AM Radio Reply with quote
Probably off topic..
but
how does AM radio work??
is it at its most basic form just a massive amplifier hooked up to an antenna??
The reason I ask..I have just completed buliding a subwoofer from an old 40W car amp and a PC power supply.. turned it on and I pick up 729kHz (a local Am station) pretty much crystal clear.
there is no receiver curcuit in the amp, its purely an amp only.
I assume my 5 m signal cable from the DVD is acting as an antenna..
Is this possible?
Sun Jun 22, 2003 3:20 am
pcs
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post power supply... Reply with quote
Your power supply is a switcher, probably operating at about 100KHz.
You are hearing this at the 7th harmonic at around 729KHZ.

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