Comment by Morli on June 6, 2010 at 4:06am

Good Work Nima, best of our wishes and luck for OB2010. The Elev support beam in antenna system looks not strong enough ( bit of sag due to weight) , may be solid rod in side or alu tube might be better at this IMHO.

Moderator Comment by Gary Mortimer on June 6, 2010 at 5:10am

Congratulations in getting through stage one.

Comment by Lew Payne on June 6, 2010 at 8:20am

Nice yagi beam ground station antenna. I like the fact that you incorporated a grid (ground plane) into the end of it, to help shape the lobe such that you get a better front-to-back ratio (and thus, increased gain). Also, I love the fact that you're doing composite work and have access to such nice facilities (and machines). I'm jealous; I have no skills when it comes to fabrication (but I make up for it in electronics and software).

Comment by noman on June 6, 2010 at 8:39am

i also want to implement this please guide me

Moderator Comment by Thomas J Coyle III on June 6, 2010 at 1:07pm

Nima,

What are you using for your diversity controller?

Regards,
TCIII

Comment by Nima K on June 6, 2010 at 3:21pm

@Morli:

The picture doesn't do the beam justice. It's actually 2 SHS carbon tubes which are sandwiched vertically and it's very stiff.

@Lew:

We didn't make the Yagi, but I do agree that it's a nice design. As for the machining, we built the CNC machine from scratch so if you really want to, and for about $5000 -$6000 you can set one of them up wherever you've got the space.

@noman:

What is it exactly that you wish to implement? I'll help you where I can.

@Thomas:

No diversity controller. One antenna per radio. Two radios, two frequencies.

Comment by Morli on June 6, 2010 at 3:41pm

Ok :) , yep the photo angle is misleading. By sandwitched vertically, you mean like over&under shotgun barrel?
yagi looks nice one. Which model? link please. I found one used( 2.4ghz) but it is folded dipole like yours and am not sure if feedpoint impedance is 50 ohm with 1:6 transformer inside the molded junction or not. How are you matching it? or it does not need matching?
two freq , 2.4 and 900 ??

Comment by Nima K on June 6, 2010 at 3:44pm

@Morli:

Here's the link for the Yagi:

http://www.citytechnology.com.au/microbeam/index.php?main_page=prod...

Just for my own interest, does anyone actually follow the link and read the blog?

Comment by Morli on June 6, 2010 at 3:53pm

Thanks Nima for the link.

You will be surprised as to how many people follow your blog :)). That model of yours has separate followers ;)

Comment by Nima K on June 6, 2010 at 10:41pm

Thanks NS Rana and Morli!

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