[TowerTalk] Mounting 1.25 stinger in 3" tubing?

[Mpridesti]

Jeff

Should be no issue using dramatically different diameters and I believe modeling programs will give the additional length required for resonance. 

Anytime you have a step in diameter, you have lengthen the overall element to compensate. 

Just guessing, you probably need 2 or 3 ft more of element length to offset the 3 inch to 1.25 inch transition. 

Others here can be more precise. 

Regards,

Mark, K1RX


> On Jun 8, 2019, at 12:08 PM, Jeff Blaine <KeepWalking188 at ac0c.com> wrote:
> 
> I'm rebuilding my 40m 4-sq verts and have some 15' lengths of 3" OD/ 2.75 ID tubing to use on the base end.  And for the "stinger" end, I have some tapered elements off an old yagi that are 1.25" OD on the bottom of the 17' length.
> 
> Other than buying some concentric lengths of aluminum to step from the 1.25 OD stinger up to the 2.75 ID base tubing, any good ideas of an interposer that would take up some of the space?
> 
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
> 
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