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Lower metal coil shaft...Does it affect the performance?

A

Anonymous

Guest
Hello,
About two years ago. Someone had posted on the BBS Forum if a lower metal shaft would in someway affect the Performance. I did some air test using both a metal and non-metal coil shaft. The results where both the same. I feel that because the metal shaft and coil are both moving together, the metal shaft will not affect the performance.
However! Now, I am wondering about these super hot Pulse units in the water. I would think that when you are swinging the coil in the water. The movement from the water is creating fiction on the metal shaft, making the metal shaft flex just a tiny bit. I wonder if this is enough is cause the pluse unit to false or change the pitch of sound. as you swing bach and forth.
Just my two cents worth?
HH, Paul
 
That should be easy to find out about, Just change out the shaft.
I'm sure for temp use the shaft does not have to be a good match.
I have already done so with my unit, but it would put your mind to ease if you found the answer yourself. <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)">
Bill
 
Hi Paul,
Any relative movement between a lower metal shaft and the coil is likely to give false signals. This is particularly so in water due to the drag both on coil and shaft. Also the lower end of the coax should be firmly secured by Velcro straps for the same reason. There is no reason to use metal lower shafts these days as fibreglass tubing is readily available, light and very strong.
Eric.
 
Hello Eric and Bill,
Thank you for the fast response. I have a few Fiberglass shafts that I can pick from my junk pile. I will mount one in this week and will use Velcro strips on the coax cable.
I can understand how the water can create drag on the shaft and coax cable. The tiny flex in the lower metal shaft due to the drag of the water may affect the unit. The taller beach hunters that extend the lower metal shaft all the way out for swinging coverage while beach wading will create the metal shaft to flex even more.
Thanks again,
Paul
 
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