On Sun, 27 Jan 2013 21:36:14 +0000, Channel Jumper
wrote:

I think that everyone on this forum has missed the point.
The op does not understand how antenna's works, is stuck in the CB radio
and won't listen to reason.

Have you ever posted anything that didn't begin by insulting the
person you were allegedly trying to help? May I suggest you drop the
intro for no better reason than improving your credibility.

A 9' long Ringo is 6 meters - 50 MHz.
It is also a 1/4 wave antenna for 27 MHz but will not work for 11
meters, because the impedance is all wrong - almost 5:1 VSWR....

The CB version of the Ringo Ranger is 7 meters (23 ft) long or 5/8
wave at 27Mhz. See link at bottom. It could best be used as an HF
vertical (with an antenna tuner).

When you shorten a antenna that is designed to work on another
frequency, the design has to match in order for it to work and have the
right impedance and be resonant.

Half right. It should be the correct antenna, but not necessarily
resonant at the operating frequency. Minimum VSWR is not the same as
resonance. You can easily have minimum VSWR and still have some
reactive components left, while the definition of resonance is where
the inductive and capacitive components cancel, leaving a purely
resistive antenna impedance.

A full wave antenna, other then a dipole antenna is not a balanced
load.

The ring on the Ringo is the match, and the ring is around 32 inches
long.
You have to subtract 30 inches from the total length - which a resonant
antenna would only be about 40 inches long.

That doesn't leave much of a stub sticking up for a vertical radiator.

Throw the ring match thing away.

I gave away a HALO antenna for two meters, for working SSB and digital
modes and the diameter of it was only about 24 inches.

Hmmm... Circumference = 24" * Pi = 75 inches = 1.9 meters. Ok, full
wave loop antenna.

Making a antenna is not as simple as just sticking something up in the
air and connecting the coax to it and cutting off the excessive length
and expecting it to work, like a mobile CB radio antenna........

Actually, making a piece of metal into an antenna is that simple, but
only if you understand how to match the transmitter impedance to the
antennas almost random impedance. See my comments to Tom in this
thread. However, convincing that antenna to direct its energies in a
useful direction is far more difficult.

Who was it that said, you can't fix stupid!

They were wrong. Many stupid people have risen to high office and
position. Fixing the damage they've done is difficult, but still
possible with a change of administration.

Buy a 2 meter antenna, forget about trying to make something out of your
CB radio crap to save a couple of bucks.

That would probably be the easy way. However, learning and progress
has never followed the easy path.

What you could do is buy the ARRL antenna book and make a 4 element beam
antenna out of the antenna segments of the Ringo if you had a piece of
box tubing - antenna boom and a Gamma Match..

Good idea, but I would hate to cut up an antenna worth $1500:
http://articulo.mercadolibre.com.mx/MLM-410527401-antena-para-cb-de-base-ringo-ranger-con-envio-gratis-_JM

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558