[Antennas] coil wiper

Tue Feb 15 22:43:56 EST 2005

I am not sure that the flattened copper pipe will be that good.
My questioning arises from
1 copper work hardens, so that the flattening will harden and imbrittle the copper 
tube
2 depending upon the alloy of copper it may oxidize very rapidly.
I donot know the electrical properties of some of the stainless steels or some of the 
oxidize inhibited aluminium alloys, but they might be looked at.
Some labs throw out small tubing of SS.
Chris opr VE7HCB
> > > I suspect they'll work OK, but I would be concerned with the
> > > graphite dust shedding onto the coil over time, but maybe this is
> > > not a problem..
> > > 
> That is one thing I was wondering about. Also if the graphite would
> actually function at RF.
>> > > I guess you know that most folks use "fingerstock", and that there
> > > is at least one mfr which uses something else (that is nameless)
> > > that they claim is much better than fingerstock.
> > > 
> Part of why I would like to homebrew a screwdriver....get rid of the
> fingerstock........
>> Idea is to wind the coil on a PVC core from flattened copper pipe.
> Then, use large copper tube over that for the vertical connection.
> Hope to add cap to the system to try for 160-10 and allow for a longer
> coil. Another benefit is that another motor could be used to raise the
> whole thing up on a telescoped tube and double the length when parked.
>> May not work, but think it is worth a try....
>> Mel
> N7OKL
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