cushcraft X7 - help
 

Hi oM
I'm Pasquale IW0HEX, I live in Rome, ITALY
I bought a tribander antenna, Cushcraft X7, second hand (used) from OM
in South Italy.
Now I have 2 manuals of this antenna, one original and one download on
cushcraft homepage by internet.
There are some difference into 2 manuals about element's lenght.
In details :

Element Original manual (8/98) Download manual (12/97)

1 220" 220"
2 147-1/2" 147-1/2"
3 205-1/2" 208" (difference !!)
4 140" 137" (difference !!)
5 111" 111"
6 83" 86" (difference !!)
7 75" - 7" - 29" 77" - 7" - 35" (difference !!)

Last element (7) is trapped so it's divided in 3 parts (2 traps)

My question is : which are the rights lenghts ?????
Who has installed this antenna can help me ????
Tnx in advance.

73s Pasquale IW0HEX

cushcraft X7 - help
 

On 30 Sep 2006 04:53:05 -0700, "Pasquale" wrote:

My question is : which are the rights lenghts ?????

Hi Pasquale,

Literally, it depends on when the antenna was built (which standards
did it use).

The practical answer is: the proper length is what you measure after
tuning it. Split the differences and start tuning from there.

73's
Richard Clark, KB7QHC

cushcraft X7 - help
 

There are 2 manuals version......

one on August 1998 and one on December 1997.

On cucshcraf site there is version on 12/1997 but reading this webpage
X7 reviews

http://www.gm4nhi.freeserve.co.uk/X7review.htm

it's seem that right version is on manual 8/1998 (recent version)
I wrote element lenght in my first msg....
Which is the rights version ?

I suppose the most recent, so August 1998.
Pse, let me know.

73s Pasquale IW0HEX

cushcraft X7 - help
 

On 30 Sep 2006 10:45:35 -0700, "Pasquale" wrote:

one on August 1998 and one on December 1997.

Hi Pasquale,

The problem is which manual was the antenna designed FOR?

If you do not know when the antenna was built/sold, then "which
manual" does not make much sense.

As offered, split the difference (choose lengths half way between
different lengths offered) and tune the antenna. The antenna is
probably NOT going to be in tune by simply following dimensions.
Dimensions are simply a starting point. Few antennas are erected in a
tuned condition (they rarely work the first time).

This means you will have to
1. put it together,
2. tune it or build to dimensions (or split dimensions),
3. put it up,
4. measure SWR across frequencies and bands, and
5. take it back down and change dimensions.
Repeat 3/4/5 until all bands measure to satisfaction.

Alternatively, erect the antenna pointing up. This is so you have
access from the ground to make the first tunings. This saves putting
it up and taking it down too much.

73's
Richard Clark, KB7QHC

cushcraft X7 - help
 

Pasquale wrote:
Hi oM
I'm Pasquale IW0HEX, I live in Rome, ITALY
I bought a tribander antenna, Cushcraft X7, second hand (used) from OM
in South Italy.
Now I have 2 manuals of this antenna, one original and one download on
cushcraft homepage by internet.
There are some difference into 2 manuals about element's lenght.
In details :

Element Original manual (8/98) Download manual (12/97)

1 220" 220"
2 147-1/2" 147-1/2"
3 205-1/2" 208" (difference !!)
4 140" 137" (difference !!)
5 111" 111"
6 83" 86" (difference !!)
7 75" - 7" - 29" 77" - 7" - 35" (difference !!)

Last element (7) is trapped so it's divided in 3 parts (2 traps)

My question is : which are the rights lenghts ?????
Who has installed this antenna can help me ????
Tnx in advance.

73s Pasquale IW0HEX

Pasquale, the measurements you list in the original manual is the same
as in my manual, the date on my manual is 5/99.
I put the antenna up about a year ago and using those measurements it
works great without any tuning.
The tuner in the radio will also tune it on 24 and 28 Mhz, I also was
able to tune it on 40 meters.
73 Bill

cushcraft X7 - help
 

Tnx a lot Bill and tnx again to everyone helps me.
I received many emails and now I know the right thnig to do.
The right manual is August 1998 (another version May 1999 reports same
element's lenght).
This is for improving any possible SWR problem in 15 meters with the
first version on X7 antenna.
Tnx a lot again.
See you soon on the air.
Pasquale IW0HEX