Dipole Insulators

Status
Not open for further replies.

ckmcdonald

Member
Joined
Dec 21, 2016
Messages
29
Dumb question.... Why do purchased dipoles have insulators at the ends of the elements?
Why not tie the dacron rope to the wire?
 

W3DMV

Member
Joined
Jan 2, 2009
Messages
622
Location
Gettysburg, Pa
When dry, many ropes are good insulators
but when they get wet, they become conductors
and will change the antenna tunning..
 

prcguy

Member
Joined
Jun 30, 2006
Messages
10,022
Location
So Cal - Richardson, TX - Tewksbury, MA
The ends of a 1/2 wave dipole are high impedance and can have very high voltages on them. If you were to have bare wire attached to rope and the rope gets wet, it can change the characteristics of the antenna. You can also start a fire with enough power and the right circumstances.

Its a good idea to use an adequate RF and high voltage insulator on the dipole ends and mfrs of these antennas have no way of knowing how you will use them so they come with insulators.
Just my 2c
prcguy


Dumb question.... Why do purchased dipoles have insulators at the ends of the elements?
Why not tie the dacron rope to the wire?
 

jwt873

Member
Premium Subscriber
Joined
Dec 1, 2015
Messages
994
Location
Woodlands, MB
As pcrguy points out, there is high voltage at the ends of a dipole.

But, I've actually gotten away with using plain yellow nylon rope. I had a 40 meter dipole up for several years. The rope at the ends was supposed to be temporary while I tested it, but it worked OK rain or shine so it stayed as it was much longer than I anticipated.

Right now, all I have is an 80 meter inverted vee in place. I am using proper insulators between the ends of the antenna and the support ropes.
 
Status
Not open for further replies.
Top