hello all
thanks all who read and emailed back
lot of good info came in and I have a good handle on it
I am building this antenna for rhcp portable satellite antenna for LEO Ham
Radio Sat
thanks again
Howard

"Howard Kowall" wrote in message
...
Hello all
What determines the Velocity Factor of a coax cable.
Is it the center conductor awg,dielectric,shield or all combined
I am building a
Lindenblad Antenna for 2 Meters

its asked to use

RG-59 polyethylene foam coax with stranded center conductor

I think the VF is .66

I cant find any stranded center cond where I am,so I want to try it with
Solid,but it seems all the solid is VF .88

anyone have any input on this

thanx

howard

I've found quite a variation in foamed dielectric cable velocity factor
from lot to lot of the same brand and type, even with major brands.
Apparently they don't control the density of the dielectric very well.
So if you're planning on using foamed dielectric cable in an application
where VF is important, I highly recommend that you measure the VF of a
sample from the same piece you'll be using.

Roy Lewallen, W7EL

"Roy Lewallen" wrote in message
treetonline...
I've found quite a variation in foamed dielectric cable velocity factor
from lot to lot of the same brand and type, even with major brands.
Apparently they don't control the density of the dielectric very well. So
if you're planning on using foamed dielectric cable in an application
where VF is important, I highly recommend that you measure the VF of a
sample from the same piece you'll be using.

Roy Lewallen, W7EL

I second that Roy,
Each time we start a new spool (same mfg) we have to remeasure the V.F.-
RG-11U foam.
I too believe it is the foam density that is not well controlled.

Dale W4OP

"Howard Kowall" wrote in message
...
hello all
thanks all who read and emailed back
lot of good info came in and I have a good handle on it
I am building this antenna for rhcp portable satellite antenna for LEO
Ham Radio Sat
thanks again
Howard

"Howard Kowall" wrote in message
...
Hello all
What determines the Velocity Factor of a coax cable.
Is it the center conductor awg,dielectric,shield or all combined
I am building a
Lindenblad Antenna for 2 Meters

its asked to use

RG-59 polyethylene foam coax with stranded center conductor

I think the VF is .66

I cant find any stranded center cond where I am,so I want to try it with
Solid,but it seems all the solid is VF .88

anyone have any input on this

thanx

howard

Hi Howard

The Lindenblad has an overhead null that you might find anoying for some
high elevation passes of LEOs.
Are you open to trying to build a DCA (which is an antenna that I
developed)? I make the claim that there is no other hemispheric coverage
antenna design that performs better than a DCA. But, I sure am open to
being corrected.
The Feb 2008 QST contains an article on the DCA antenna design concept.
It is my claim that a DCA is extreemely forgiving of construction errors
and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites as
"baluns'.

Jerry KD6JDJ

The Lindenblad has an overhead null that you might find anoying for some
high elevation passes of LEOs.
Are you open to trying to build a DCA (which is an antenna that I
developed)? I make the claim that there is no other hemispheric coverage
antenna design that performs better than a DCA. But, I sure am open to
being corrected.
The Feb 2008 QST contains an article on the DCA antenna design concept.
It is my claim that a DCA is extreemely forgiving of construction errors
and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites as
"baluns'.

Jerry KD6JDJ
Given the fact I don't subscribe to QST, domicile Australia, would you have
a copy of the article?

HH

"Harry H" wrote in message
...

The Lindenblad has an overhead null that you might find anoying for some
high elevation passes of LEOs.
Are you open to trying to build a DCA (which is an antenna that I
developed)? I make the claim that there is no other hemispheric
coverage antenna design that performs better than a DCA. But, I sure am
open to being corrected.
The Feb 2008 QST contains an article on the DCA antenna design concept.
It is my claim that a DCA is extreemely forgiving of construction errors
and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites as
"baluns'.

Jerry KD6JDJ
Given the fact I don't subscribe to QST, domicile Australia, would you
have a copy of the article?

HH


Hi HH

It would be my pleasure to disclose any/all the information I have
relating to the DCA antenna design concept. It is simple. It is two pairs
of crossed dipoles. Each pair is spaced 1/4 wave apart and fed in phase.
One pair is physically mounted 90 degrees from the other pair. All four
dipoles are tilted 30 degtrees from vertical. One pair is fed 90 degrees
later than the other pair.
The concept is so simple and straightfoeward that it is probable that the
concept has been developed before I thought of it. But, I have been unable
to find anything published related to this simple "Double Cross Antenna"
I told my *Internet buddy*, Patrik Tast, in Finland about the concept and
he found it to be exactly what he needed for reception of NOAA weather
satellite signals. Patrik publishes alot of what I send him related to the
antenna. Patrik shows a section of his web page to describe the DCA to
anyone interested. You can find the QST article in the section Patrik
identifies as ANTENNAS on the first page of his site
http://www.poes-weather.com/index.php.

If you have any questions about the DCA concept you are free to E-mail me,
anytime. Or, if you have any facts or data to show where I am wrong about
how well this antenna performs, or know of something that performs better,
please set me straight.

Jerry KD6JDJ

"Jerry" wrote in message
...

"Harry H" wrote in message
...

The Lindenblad has an overhead null that you might find anoying for
some high elevation passes of LEOs.
Are you open to trying to build a DCA (which is an antenna that I
developed)? I make the claim that there is no other hemispheric
coverage antenna design that performs better than a DCA. But, I sure
am open to being corrected.
The Feb 2008 QST contains an article on the DCA antenna design concept.
It is my claim that a DCA is extreemely forgiving of construction
errors and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites
as "baluns'.

Jerry KD6JDJ
Given the fact I don't subscribe to QST, domicile Australia, would you
have a copy of the article?

HH


Hi HH

It would be my pleasure to disclose any/all the information I have
relating to the DCA antenna design concept. It is simple. It is two
pairs of crossed dipoles. Each pair is spaced 1/4 wave apart and fed in
phase. One pair is physically mounted 90 degrees from the other pair.
All four dipoles are tilted 30 degtrees from vertical. One pair is fed
90 degrees later than the other pair.
The concept is so simple and straightfoeward that it is probable that the
concept has been developed before I thought of it. But, I have been
unable to find anything published related to this simple "Double Cross
Antenna"
I told my *Internet buddy*, Patrik Tast, in Finland about the concept and
he found it to be exactly what he needed for reception of NOAA weather
satellite signals. Patrik publishes alot of what I send him related to
the antenna. Patrik shows a section of his web page to describe the DCA
to anyone interested. You can find the QST article in the section Patrik
identifies as ANTENNAS on the first page of his site
http://www.poes-weather.com/index.php.

If you have any questions about the DCA concept you are free to E-mail
me, anytime. Or, if you have any facts or data to show where I am wrong
about how well this antenna performs, or know of something that performs
better, please set me straight.

Jerry KD6JDJ


.... but surely this is the same as a Lindenblad array? The tilt of the
dipoles was always a parameter in the Lindenblad, so I wonder how your DCA
differs from what N. E. Lindenblad described in the April 1941 edition of
'Communications'.

Chris

On Feb 10, 1:57*am, "Jerry" wrote:
"Harry H" wrote in message

...





*The Lindenblad has an overhead null that you might find anoying for some
high elevation passes of LEOs.
*Are you open to trying to build a DCA (which is an antenna that I
developed)? * I make the claim that there is no other hemispheric
coverage antenna design that performs better than a DCA. * But, I sure am
open to being corrected.
*The Feb 2008 QST contains an article on the DCA antenna design concept.
*It is my claim that a DCA is extreemely forgiving of construction errors
and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites as
"baluns'.

* * * * * * * * * * * *Jerry * KD6JDJ
Given the fact I don't subscribe to QST, domicile Australia, would you
have a copy of the article?

HH

* Hi HH

* It would be my pleasure to disclose any/all the information I have
relating to the DCA antenna design concept. * It is simple. *It is two pairs
of crossed dipoles. * Each pair is spaced 1/4 wave apart and fed in phase.
One pair is physically mounted 90 degrees from the other pair. * All four
dipoles are tilted 30 degtrees from vertical. * One pair is fed 90 degrees
later than the other pair.
* The concept is so simple and straightfoeward that it is probable that the
concept has been developed before I thought of it. * But, I have been unable
to find anything published related to this simple "Double Cross Antenna"
* I told my *Internet buddy*, Patrik Tast, in Finland about the concept and
he found it to be exactly what he needed for reception of NOAA weather
satellite signals. * Patrik publishes alot of what I send him related to the
antenna. *Patrik shows a section of his web page to describe the DCA to
anyone interested. * You can find the QST article in the section Patrik
identifies as ANTENNAS on the first page of his sitehttp://www.poes-weather.com/index.php.

* If you have any questions about the DCA concept you are free to E-mail me,
anytime. * Or, if you have any facts or data to show where I am wrong about
how well this antenna performs, *or know of something that performs better,
please set me straight.

* * * * * * * Jerry * *KD6JDJ

Looked at the URL
What this antenna is doing is to aproach equilibrium by taking into
account the "weak force" which demands a tilting away from parallelism
or the verticle position away from the surface of the earth, without
which the radiation pattern will not be balanced.
When a U.S.naval base tipped all its verticle antennas at an angle
referenced to earth this prior null must have been of great
inconvenience with respect to defense alertness.

On Tue, 10 Feb 2009 07:57:28 GMT, "Jerry"
wrote:


"Harry H" wrote in message
...

The Lindenblad has an overhead null that you might find anoying for some
high elevation passes of LEOs.
Are you open to trying to build a DCA (which is an antenna that I
developed)? I make the claim that there is no other hemispheric
coverage antenna design that performs better than a DCA. But, I sure am
open to being corrected.
The Feb 2008 QST contains an article on the DCA antenna design concept.
It is my claim that a DCA is extreemely forgiving of construction errors
and uses 4 wire dipoles and 50 ohm coax with 5 RFI type ferrites as
"baluns'.

Jerry KD6JDJ
Given the fact I don't subscribe to QST, domicile Australia, would you
have a copy of the article?

HH


Hi HH

It would be my pleasure to disclose any/all the information I have
relating to the DCA antenna design concept. It is simple. It is two pairs
of crossed dipoles. Each pair is spaced 1/4 wave apart and fed in phase.
One pair is physically mounted 90 degrees from the other pair. All four
dipoles are tilted 30 degtrees from vertical. One pair is fed 90 degrees
later than the other pair.
The concept is so simple and straightfoeward that it is probable that the
concept has been developed before I thought of it. But, I have been unable
to find anything published related to this simple "Double Cross Antenna"
I told my *Internet buddy*, Patrik Tast, in Finland about the concept and
he found it to be exactly what he needed for reception of NOAA weather
satellite signals. Patrik publishes alot of what I send him related to the
antenna. Patrik shows a section of his web page to describe the DCA to
anyone interested. You can find the QST article in the section Patrik
identifies as ANTENNAS on the first page of his site
http://www.poes-weather.com/index.php.

If you have any questions about the DCA concept you are free to E-mail me,
anytime. Or, if you have any facts or data to show where I am wrong about
how well this antenna performs, or know of something that performs better,
please set me straight.

Jerry KD6JDJ


I would be interested in seeing what NEC would make of one of these.