> How does the "hat" on a Cushcraft 402-CD work? You have those
> crossed aluminum rods after the coil, then extended aluminum
> after that. What happens if you take off the crossed rods?
The "hat" on the Cushcraft 402-CD (and XM-402) provides relatively
little capacitance compared to the element tip. Without the
"hats," the element tip would need to be extended by 24 to 36"
each side (and 5' of 1/2" tubing is already a bit mechanically
suspect). However, if one were to remove the hats and extend
the element tips, loses would decrease by about .4 dB (according
to AO).
I suspect the hats were there to reach a particular design
goal for element length and allow smaller tubing in much of
the elements.
73,
... Joe, K4IK
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