Where have all the mainsprings gone? (4)

=Semi-Automation of 2 elements cross-yagi =


Most of the materials for the antenna can be found at hardware stores in the neiborhood.  Should the antenna boom be shared between 145MHz and 435MHz?  The fixed vertical beam I made before was shared, with 435MHz on top and 145MHz on the bottom (making it look a bit like a Christmas tree), but this time the assembly is a bit complicated so I’ll separate them and bundle them together.

Now that this antenna is set inclined, it’s no longer in the “TURNSTILE” shape.   In my mind, I had the image of a “2-element turnstile to complement a GP antenna, then rotating that”, but I think from now on it should be called a “2-element cross Yagi”, which is a similar design.

The 2-element cross yagi now looks like a 435MHz cross yagi sitting on top of a 145MHz cross yagi.  Not only is it heavy, but the idea is to turn the antenna with a weak kitchen timer, so I wanted to make the rotational moment as small as possible.  If the eccentricity is too large, the timer will lose.

How do I get the chicken to carry this antenna?  This was also a bit of a challenge.   At first I thought about making a single boom that would go from the chicken’s chest to its butt, but I thought the resulting antenna would be a bit too surreal….. so I posed it with the back of its neck doing barbell squats and reinforced it by fastening it with a screw behind the wings. This makes it easier to replace when needed.



(to be continued)

To: Where all the Mainsprings gone? (5)

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