not cutting excess wire beyond antenna
 

Assume one has borrowed a spool of wire, on the condition that one is
not allowed to cut it.

OK, say we'll make a folded dipole. Can one just ignore the unused
portion still on the reel beyond the contact clamp? We should roll it
away from the antenna a little, yes. Assume we have only used 1/2 the
wire. I suppose effects go up as frequency goes up. Probably the
best answer is to pick another design that will use the whole reel.

Bet Cebik never thought of this problem.

Assume one has borrowed a spool of wire, on the condition that one is
not allowed to cut it.


Dan, Wire is so cheap and plentiful, if I wanted to put up a folded dipole,
the very last thing I would do is borrow wire with the stipulation that I could
not cut it.:-)

I don't know, but I bet LB W4RNL has not thought about cut or not to cut.







73 Gary N4AST

Dan,
Folding, or wrapping the wire around it's self in effect
makes that doubled portion 'dissapear'. So, doubling the
excess wire until the unneeded portion 'dissapears', should
work. Or, just make a loop for the frequency you want. That
always uses more wire than a dipole...
'Doc

On Sun, 04 Apr 2004 09:07:28 -0700, Bill Turner
wrote:

On Sat, 03 Apr 2004 21:48:55 -0600, 'Doc wrote:

Folding, or wrapping the wire around it's self in effect
makes that doubled portion 'dissapear'.

_________________________________________________ ________

But having a spool of wire there will add some capacitance to the
antenna, thus lowering it's resonant frequency a bit.

And having a spool of insulated wire there will add a gob of
inductance and with close-spaced turns: loss.

73's
Richard Clark, KB7QHC

On Sun, 04 Apr 2004 12:21:47 -0700, Bill Turner
wrote:

On Sun, 04 Apr 2004 17:54:20 GMT, Richard Clark
wrote:

And having a spool of insulated wire there will add a gob of
inductance and with close-spaced turns: loss.

_________________________________________________ ________

True, but a "gob" of inductance will have little current flow through
it, and especially so when there is no wire on the other side of the
inductance. Not to worry.

Hi Bill,

The interwinding capacitance has got to be another gob to a gob and a
half. Naw, I don't worry about it either.

73's
Richard Clark, KB7QHC

Bill Turner wrote:
On Sun, 04 Apr 2004 23:47:33 GMT, Richard Clark
wrote:


Hi Bill,

The interwinding capacitance has got to be another gob to a gob and a
half. Naw, I don't worry about it either.


__________________________________________________ _______

Well, if you have a gob of inductance and a gob of capacitance, you have
a resonant circuit. Now we can worry. :-)

Time for Willy Wonka's Everlasting Gobstoppers!

- Mike KB3EIA -