Hi again Brian,VK2XTC wrote:I like the pirtek clamp option as I no longer have a a bench drill and drilling accurate holes that align correctly in a boom with a hand held drill is problematic.
Can you substitute a Folded dipole DE with a Split Dipole DE in the same antenna design? The folded Dipole DE seems difficult at present with no pipe bender.
Next time you travel to Bunnings if you haven't already got one, get a centre punch. Will make life much easier drilling by hand if that is all that is available.
http://www.bunnings.com.au/trojan-125mm ... h_p5612052
Also do not drill the roof screws in with the clamps with a drill. Use a socket set or similar.
Using a folded dipole will in most cases raise the feedpoint impedance to somewhere around 200 ohms. You will then need to build a 4:1 balun to match this back to 50 ohms.
Have you used MMANA antenna modelling software before? Put your yagi design dimensions in and have a play.
http://hamsoft.ca/pages/mmana-gal.php
Can be a bit difficult to get used to at first, but maybe you can load one of their test antenna files and have a look how it works.