On Wed, 30 Aug 2006 06:19:09 GMT, "Lee"
wrote:

I have a wide angle lens (low gain) it`s known as a discone !!!
freq range to 3000megs,

Hi Lee,

Simply because it has a "frequency range to 3000megs" does not mean it
is usable to 3000megs - only that it matches to 3000megs. Matching
and usability are not strictly related.

supposedly 0db ref dipole that has heard one
or two weak signals just outside its range

Antennas don't have "ranges." You may experience poor performance due
to the combination of transmit power, path loss, and receiver
sensitivity, but none of this has anything to do with the antenna
(unless its poor construction adds loss). If you have too much path
loss, not enough transmit power, or poor receive sensitivity, then,
yes, a gain antenna will make up for those problems (as long as S+N/N
is sufficient in the end) - but this still does not confer a range
specification to an antenna.

This would be whole lot simpler if you simply told us the model number
of this discone.

If i knew how to scale or re-engineer an existing design, i wouldn`t be on
this NG
asking how to do it ...

You don't offer enough parameters like frequency span, gain, F/B, how
long a feedline, what kind of feedline (lot of potential loss there)
for someone to whip out a design here, and that wouldn't be a modest
enterprise if you did. Scaling is the easiest solution, perhaps you
should buy a log periodic. Google would be another solution, your
problem would not be unique - would it?

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...
On Wed, 30 Aug 2006 06:19:09 GMT, "Lee"
wrote:

SNIP!!!!

Richard, all i want is design software to build a LPA!!!! do you or
don`t you know of any?????

Lee.....G6ZSG.......

On Wed, 30 Aug 2006 07:04:08 GMT, "Lee"
wrote:
Richard, all i want is design software to build a LPA!!!! do you or
don`t you know of any?????

EZNEC

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...
On Wed, 30 Aug 2006 07:04:08 GMT, "Lee"
wrote:
Richard, all i want is design software to build a LPA!!!! do you or
don`t you know of any?????

EZNEC

Why didn`t you say that in the first place??

Thankyou...

G6ZSG...


73's
Richard Clark, KB7QHC

On Wed, 30 Aug 2006 08:16:12 GMT, "Lee"
wrote:

EZNEC

Why didn`t you say that in the first place??

Hi Lee,

Because of various clues in your discussion, and your claim
If i knew how to scale or re-engineer an existing design, i wouldn`t be on
this NG
asking how to do it ...
Re-engineering goes to the heart of a successful outcome and is part
and parcel to modeling. On the other hand, the trivial work for
simple scaling will always give a solution.

EZNEC, although probably the best modeler for the occasion, is one
that does require deep knowledge of design elements and program
operation in this case. Modeling an LPDA is not trivial.

73's
Richard Clark, KB7QHC

ARRL Antenna Handbook gives all the LPDA design equations.

However, LPDAs do not have high gain!! They have typical gain of 6 to 8 [+/-]
dBd and broad bandwidth. They typically function as either a three or four
element driven array. They are driven arrays, not parasitic [i.e. Yagi
principle] designs.

Also, LPDAs for 3,000 MHz will have a L/D ratio issues with element geometry and
general construction will require fairly precise measurements.

Unlike a Yagi, a long boom length LPDA does not equate into higher gain.

/s/ DD

Lee wrote:

"Richard Clark" wrote in message
...

On Wed, 30 Aug 2006 06:19:09 GMT, "Lee"
wrote:


SNIP!!!!

Richard, all i want is design software to build a LPA!!!! do you or
don`t you know of any?????

Lee.....G6ZSG.......

"Dave" wrote in message
. ..
ARRL Antenna Handbook gives all the LPDA design equations.

However, LPDAs do not have high gain!! They have typical gain of 6 to 8
[+/-]
dBd and broad bandwidth. They typically function as either a three or four
element driven array. They are driven arrays, not parasitic [i.e. Yagi
principle] designs.

Also, LPDAs for 3,000 MHz will have a L/D ratio issues with element
geometry and
general construction will require fairly precise measurements.

Unlike a Yagi, a long boom length LPDA does not equate into higher gain.

/s/ DD

Yes thanks Dave i am aware of the functions of a LPA i just need a little
directivity
and a little more gain than a discone offers, plus design software!!...

Regards...

Lee....G6ZSG......

Lee wrote:

Yes thanks Dave i am aware of the functions of a LPA i just need a little
directivity
and a little more gain than a discone offers, plus design software!!...

If you're looking for software to design an antenna for you, EZNEC isn't
it. EZNEC will analyze an antenna you design, but it won't design it for
you.

Roy Lewallen, W7EL