DIY 15ele Yagi 1090Mhz

[north borneo radar]

Hiya all,

Just to show a 15ele DIY Yagi made from an unwanted TV Yagi kindly given to me by me neighbour. it was cleaned and sprayed with new coat of paint to give it a new look.

The model is based heavily on the 15ele yagi document in French from PP group and with the use of the Yagi Calculator by John Drew. I have a 2CH Beast and was hoping to capture a/c at my northwest that the PCB antennae failed to pick up ( just over the 150nm range). That route is mainly used by planes from USA/Japan/Philippines going to Singapore, so it can be quite busy sometimes.

I didn't take a before picture which I should have with hindsight. A 15ele Yagi was chosen because the boom was long (1.5m) so more elements could be used. The connection of the dipole, balun and cable to receiver is waterproofed which is not shown in the picture. it was then later installed to the roof with a 1.5m mast. Cable used was a 7m H155 from JMZ.

Findings:
1) By handheld, the yagi was able to pick up a/c as far as 200nm during initial testing, facing the south west.

2) After installation to its proper place, it was able to pick up a/c at my north west direction. (relieve!)

3) Does not work well/poor range during rain/after rain for a while. Here in Malaysia there is frequent rain and I find the yagi unable to pick up planes at the north west just before/during/just after rain. seems that this is something to do with rain noise. A slight decrease in range of the PCB antennae is also noticed. Both the PCB antennae and the Yagi connections are well waterproofed.

The future plan will probably involve getting a 10db colinear with thick coax and using it alongside the PCB antennae, as the PCB antennae has no doughnut effect that could complement the 10db colinear.  Well, once I can find a better place for the 10dbi colinear first.



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