On Sep 28, 2:38*pm, "Frank" wrote:
According to:http://ham.srsab.se/ww/temp/test_MFJ269.pdf
ARRL lab measures the range of the MFJ 269 is 6 to 400
ohms. Not sure what the difference is between this and
the MFJ 259.

Frank
The anti resonant points are well within the MFJ 259 specifications
stated above.

The results you are measuring are certainly within the range of the
MFJ 259. *As an example: a 493 ft dipole, 50 ft above an average
ground shows anti-resonance, at 1.9 MHz, and is 15,000 ohms.

Frank

Frank, that is twice that you have mentioned dipoleas a comparison.
May I remind you again that for equilibrium purposes the radiator
must be a wavelength or multiple there of, assuming ofcourse we are
considering a single radiator
To talk of a "dipole" when considering my design is totally
unreasonable.
Regards
Art

The results you are measuring are certainly within the range of the
MFJ 259. As an example: a 493 ft dipole, 50 ft above an average
ground shows anti-resonance, at 1.9 MHz, and is 15,000 ohms.

Frank

Frank, that is twice that you have mentioned dipoleas a comparison.
May I remind you again that for equilibrium purposes the radiator
must be a wavelength or multiple there of, assuming ofcourse we are
considering a single radiator
To talk of a "dipole" when considering my design is totally
unreasonable.
Regards
Art

But that is the typical input impedance of a one wavelength long
antenna (15,000 ohms).

Frank

On Oct 5, 11:29*am, "Frank" wrote:
The results you are measuring are certainly within the range of the
MFJ 259. As an example: a 493 ft dipole, 50 ft above an average
ground shows anti-resonance, at 1.9 MHz, and is 15,000 ohms.

Frank
Frank, that is twice that you have mentioned dipoleas a comparison.
May I remind you again that for equilibrium purposes the radiator
must be a wavelength or multiple there of, assuming ofcourse we are
considering a single radiator
To talk of a "dipole" when considering my design is totally
unreasonable.
Regards
Art

But that is the typical input impedance of a one wavelength long
antenna (15,000 ohms).

Frank

Yes Frank but you have to remember mine is a new design. The antenna
is now on the ground
and has a resistive impedance of three figures. I anticipate that when
I put it on my 30 foot tower the impedance will drop
on top band by 50% where I will add a transformer to drop it to 50
ohms. Now on the other bands it may well not need a transformer
so I can play around on 20 M for the winter until I can achieve a good
match or place a tuner at the tower top.
As I have stated many times a radiator does not have to be straight so
figures found with a dipole are just not applicable in my case.
In fact a anti resonant impedance can be driven below 50 ohms if one
wanted to so prior findings are just not applicable.
In a month or so you will be able to put my antenna on your computor
program and check for yourself I promise you.
Regards
Art