Make your own free website on Tripod.com

9Z4BM...Antennas

Building The X7 Antenna

Home
About Me & Antennas
My Radio Room
Inside My Radio Room
Building The X7 Antenna
My Tower Works
My Packet Radio , APRS & Other Digital Modes
Getting Into D-Star
6m and Satellite Page
2m Antennas
Emergency Comms. Page
Other Interests
Contact Me & Links
Information on my Radios
Send Your Comments or just say Hi !!!

Here I have some photos of how I converted two cushcraft Hf antennas into a Homebrewed version of the Cushcraft X7.
 
Additional material was bought.... Just traps from one element was used back.......The X7 is also a very good Triband antenna for 20-15-10m but with the tuner in my Icom 756, I get 12 & 17m very good as well...

This antenna was built for 9Z4CT-Nigel who is active on HF....It really really works good.....I would like to extend mines to the X9 but I think I will have some trouble installing that one.......               

x7material.jpg
Material from Tri & DualBanders

This is material from both a Cushcraft 3ele Triband & 3ele Dualband antennas.....9Z4CT was not happy with new location at the foot of mountains all around (He nearly sold all equipment).....I convinced him the X7 is really good antenna and would get out of literally the Hole he is now living in.

Still after scraping the 3ele Triband & 3ele Dualband antennas, more material was needed...Seen here is mostly 1in and 7/8in aluminium tubing bought.

x7materialmore.jpg

Here the boom from both antennas are combined...Actually the whole boom from one antenna plus just 1/2 from the other antenna to make up 18ft of boom....The centre piece had to be reinforced on the inside to support the weight..

x7boom.jpg

This is how I used the original centre insulators for the driven elements plus the two insulators I built by wrapping fiberglass cloth in a cylindrical manner to make a solid insultor.....
    I think Max Gain Systems  http://www.mgs4u.com/fiberglass-tube-rod.htm   in  Georgia U.S.A has solid and tube fiberglass for sale.......I really would have liked to buy the size that would fit into 1in aluminium tubing but just went along with some homebrew tubes  ...this really is homebrewing your own.

x7elements.jpg

The  Four driven elements are  shown here- Two are for 10m , One for 15m and the longest 20m.......The are also shown mounted on the boom....

x7eleboom.jpg

This is the connecting of the driven elements using flat aluminium and also seen is the matching system used.
 
I get a real good swr on the bands the antenna is designed for...The antenna is fed with a single 50 ohm cable (RG8) into a 4:1 balun...I use a Van gorden balun but my first log periodic I ever built ,I used a homebrewed 4:1 coax balun.The article was found in an old CQ magazine and It works really well.

x7matching.jpg

You can see me putting together the antenna while 9Z4CS-Jerome (centre) and 9Z4CT-Nigel (right) are thinking about renting a helicopter for installation.

x7assembly.jpg

Ok ..Here we go up the tower..you can really see the size of this baby. We got full size elements on all bands ,all on an 18ft boom. The tower is 50ft.

x7install.jpg

ISN'T SHE A BEAUTY !!!!!!!

nigelx7.jpg

Compare her with the original Cushcraft x7 antenna below..

cushcraftx7.jpg
CushCraft x7 Antenna...(click on pic to read up on antenna)

Here is a great overview of the X7 antenna by E73M---Click on photo to go to his site.

t93mx7.jpg
T93M....OverView of the X7.

I have gotten a lot of emails asking for the spacings for the X7 .....Here it is !!  Click on pic to goto to manual page

x7spacing2.jpg
X7 Spacings

This is what I enjoy doing in Ham radio..I really love building antennas and I am happy to assist anyone who wants more info if they think they can build one like this.

Cushcraft also has a 9 element version using a 24ft boom...I would have liked to put up that at my Qth but not enough space to get that size up.......Plus , after looking at the amount of gain on the X9 - too much material for just about a 1 db increase .

My current project is getting up and running on meteor scatter and EME using the WSJT software on 6m and 2m....I have already started getting the stuff together..This should be a first operation from Trinidad. Anyone wanting to hear my signal on any HF band..just email me........