[TowerTalk] Ferrite Cores in Trapped Dipoles
Dan Zimmerman N3OX
n3ox at n3ox.net
Tue Feb 6 19:10:58 EST 2007
> A trap, especially at high power, is not a good place to use any kind
> of ferrite or powdered iron core. Ferrite is notorious for saturating
> on current peaks and thereby causing distortion and harmonics.
Yet many of us are using autotuners (which all have powdered iron
inductors) on pathological matching cases, probably with high
There *is* a QRP-level trapped dipole (don't remember the callsign
associated with the design) out there that uses small iron-powder
cores for compactness. For low power levels and portability, maybe
it's not such a bad idea.
So you should watch out for saturation if you're designing a trap this
way but it's not a deal-breaker.
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