if its working then thats where it should be.

gamma match design and tuning includes:
1. distance of shorting bar from center of element
2. space between gamma rod and element
3. diameters of gamma rod and element
4. capacitance added at feed point
5. length of the whole driven element

all 5 factors go into the final match. some are easily changed, like the
capacitance, shorting bar location, and element length. the others are
harder and are usually selected to get in the ballpark and then the easy
ones are adjusted to get the desired match.



"Shadow 998" wrote in message
m...
I am tuning up my homebrew 6-meter yagi and find that the rod inserted
into
the capacitor tube of the gamma match is only inserted by about 1-1/2" to
obtain 1:1 SWR. I guesstimated and cut the spacer and shorting bar for
the
match to provide about 1-1/2" parallel space between the gamma match and
the
driven element. I did this because the text of the article did not
specify
the space. Is this dimension critical? Is it normal for a 13" gamma
match
to only need 1-1/2" of rod insertion to obtain the proper capacitance?

Thanks.
Russ KG6TDX