View single post by sparks
 Posted: Nov 9th, 2011 03:28 PM
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sparks



Joined: Jan 15th, 2008
Location: New Zealand
Posts: 77
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Either choke will work, but the second will be more sensitive to RF pickup.
If you use 500uH in total, it will make the unit very sensitive to medium wave pickup. Thats why I suggested 4.7mH instead, to make the resonant freq lower than medium wave band.
Ambient noise picked up on the medium / long wave bands is not the same structure as pure white noise. Its has a continuously varying spectral composition from brown noise to white, with small to large impulse noise structure as well.
JEFF