This might be useful to someone...
While researching the TH6 on the internet, I found 2 versions of the
manual. This first one - http://home.insightbb.com/n4mrm/TH6-DXX.pdf
which must be older, has incorrect written instructions for element
locations on the boom. It has you mount the driven element bracket
18.5" from the center of the boom to mast bracket, on the reflector
side of the boom. Then it has you mount the reflector bracket 3" from
the reflector end of the boom. All other element locations are
referenced from the driven element. These dim's don't match up with
the diagram of the assembled antenna on page 7 which shows all the
dim's correctly. The dim's in this diagram match the diagram and
written instructions in the older TH6-DX manual -
http://www.wa9wsj.com/dloads/TH6-DXX.pdf . The problem with the DXX
manual is it has you locate the driven element from the boom to mast
clamp center instead of from the reflector as was done in the DX
manual. By building it this way, the reflector is in the right
(intended) place, but all other elements are 1.5" farther away from it
than they should be. This later version of the DXX manual has the
problem fixed -
https://craq.club/files/documents/VE2PI/Hy-Gain/Hy-gain_TH6-DXX.pdf
Stick with the diagram if building a DXX!
Gerry KA2MGE
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