Great info. Thanks, Jim …

Grant NQ5T
K3 #2091 KX3 #8342

> 
> I've recently completed a year's worth of extensive lab work that has 
> convinced me that #43 is NOT a good material for HF chokes. Ditto for the #52 
> material that G3TXQ recommended. Two characteristics combine to make it a 
> poor choice. First, it's a relatively high Q material, so the resonance it 
> produces can get very narrow. Second, like all Fair-Rite parts, it's a wide 
> tolerance part -- +/- 20%.  A part at the low end of the tolerance range will 
> produce a very different choke (resonance in the wrong place, very narrow 
> bandwidth, wider resonance and not high enough impedance.
> 

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