[Antennas] Tuning Jpole question

Mon, 27 Jan 2003 2:26:27 -0600


Leave it alone. SWR is acceptable. Questions, see :Reflections by Naxwewell. Antennas ny Kraus. 73, Ron W2WU, BE
> 
> From: Steve Holm <[email protected]>
> Date: 2003/01/25 Sat PM 09:22:14 CST
> To: [email protected]
> Subject: Re: [Antennas] Tuning Jpole question
> 
> 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
> > 
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