Thread: Dipole advice?
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Old October 28th 12, 02:58 AM posted to rec.radio.amateur.antenna
Tom[_8_] Tom[_8_] is offline
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First recorded activity by RadioBanter: Sep 2012
Posts: 63
Default Dipole advice?

Thanks Channel Jumper,
but not sure which frequency I would most operate on. So with the tuner I
have I want suitable access to as many as possible. I think rebuilding the
DX CC is ok for what I want to achieve.

Do you know what is the critical points regarding those coils? I found out
the copper wire coil I have is 12ga and solid, 300meters of it, it has a
nylon jacket with a plastic layer around that. Regular industrial stuff.
So regarding those coils, could I simply replace that thinner transformer
wire with windings of the same 12ga solid in jacket that will comprise of
the rest of the dipole? Is it length of that coil's copper (badly oxidized)
that is critical or is it coil turns? The present diameter of those coils is
much smaller than the 12ga, so should I make new coils with that thinner
transformer wire and make two solder connections there or can I simply weave
the 12ga in its place? What would you recommend in this situation because I
want to rebuild this good dipole with new copper.

Thanks

73s




"Channel Jumper" wrote in message
...

Throw it away.

Make a dipole for the longest frequency you desire to operate on.

Formula is 33 / 66

Make the one leg 33% of the length of the frequency and make the other
side so that when combined to the first leg equals 66% of the total
length for the dipole.

A true Dipole is a half wavelength at the center cut frequency.

I use the term dipole loosely - because it is a non terminated antenna
that has two sides...

It will then be resonant somewhere on all frequencies above the center
cut frequency as long as the Q of the coil is high.
Don't use a low Q coil balun...




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Channel Jumper