[Elecraft] 80m KPA1500 High reflected power problems

[Grant Youngman]

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.
>