Today I built my transponder antenna.  I had already collected some data . . . read Jim Weir’s stuff, and then ran across some transponder antenna info from Dynon.  After a little bit more research, I decided to follow Dynon’s recommendation to go with a square 120mm x 120mm (4.72″ x 4.72″) metal plate for my transponder antenna.  This allows for a wider range of frequencies vs a round plate.  Also, this size plate is optimized for transponder frequencies.  I used aluminum of course for weight, 0.025″ thick.

I cut out the plate & then drilled a 1/2″ hole in the middle of the plate, chamfered the hole & then installed the TED transponder antenna.

I then focused my attention back onto the canard.  I sanded the 2″ LE overlap, and some spar cap area too.

I sanded off the bondo in 4 places along the bottom of the canard where the canard had been attached to the wood support struts.  I then also sanded the bondo off the TE overhang.

I took a string & strung it out between the corners of the trailing edge and sanded the TE straight.By the time l finished sanding I had been at it for over 2-1/2 hours.