[Antennas] Tuning Jpole question

Sat, 25 Jan 2003 19:22:14 -0800 (PST)

Sorry Paragraph change:

i.e.  @ 144 mHz, 1/4 wave = 19 1/2 inches
@ 148 mHz,  1/4 wave = 18.98 inches.

That is ONE INCH difference in electrical length right
there. 

Should read    ONE HALF INCH.
Sorry didn't pass math 101 !!
Steve

--- Daniel Boyer <[email protected]> wrote:
>    I just put up my first elevated external
> antenna... A 3/4" copper
> pipe Jpole for 2m operation...  I tried about 15-20
> different position
> for the coax connection points and got it set at the
> point which gave
> the best overall swr.  The results are that I have
> an SWR of <1.1
> measured at 144.010mhz and an SWR of 1.7 at 147.990.
>  If I move the
> contact points up, the swr goes up across the board,
> move the contacts
> down and the swr goes up across the board.  My
> question is what should I
> do to move the low swr more towards the middle of
> the band or just lower
> it overall?  Do I need to chop some pipe off of the
> main  element or off
> of the stub or something similar?
> Thanks
> Daniel
> KC9DAG
> 
> - - - 
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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