My Mast & Antenna Installation

Parts Required
We used the following bits and pieces:

• 3m galvanised pipe (32mm external diameter)
• modified Conifer (ex Galaxy) 24dBi antenna
• 3 guy wires
• 3 large eye bolts
• assorted ubolts and nuts and bolts
• coax
• silicone

I had previously obtained several 3m masts (including guy wires) when I was collecting Conifer antennas from people's roofs.
The eye bolts were purchased from a local hardware store, and I used about 10m of CNT-400 coax.

My PentiumPro with an Enterasys RoamAbout wireless card, and an SVEC WL-123 PCMCIA to PCI adapter, running Red Hat 7.3, was going to be re-used for use as a wireless router.
Note: this box has now been replaced with a Red Hat 9.0 router on a Celeron 466.

Testing
The Node Database provides shows the location of access points, and also provides compass bearings, distances, and elevation diagrams, and indicated that I should have line-of-sight from my house to the Martin Mast access point.


elevation diagram from the Node Database
I have very clear line-of-sight to the MartinMast from this location, with absolutely no trees or any other obstacles in the way.


looking towards the Martin Mast from the roof
This is a big improvement from my previous location, where my signal was going through numerous trees.

Installation
The 3m mast was installed in the same way as Marcus' mast, so I won't provide any details here.
Refer to my page detailing his antenna installation for more details.


the mast mounted on the roof
Suprisingly, despite the fact that I'm now 1.9km closer to the MartinMast, with very clear line-of-sight, I'm only getting an average SNR of about 9dB - about 3-4dB less than what I was achieving at my previous house.
I'll be doing some further testing to try to determine why this is the case, although I believe it may be due to the lobes in the elevation gain of the 180 degree waveguide at the Martin Mast (despite the fact that the elevation from this location to the Martin Mast is only 0.3 degrees higher than at my previous location).

Addendum
In January 2005, I added a 180 degree slotted waveguide to the top of the mast, connected to a Minitar MNWAPB access point, to become Seville Grove FreeNet (aka SGNet).

waveguide on the mast

AP in the roof-space

The ESSID is SGNet, with limited WAFreeNet access to DHCP users (limited to IRC/HTTP/DNS). 







sumber ; http://martybugs.net/wireless/mast.cgi

Posted By Sameera Chathuranga

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Thank You