[TowerTalk] Help needed, antenna SWR

dw bw_dw at fastmail.fm
Thu Jun 23 14:16:41 EDT 2016


An auto tuner at the base just before the remote coax switch would
certainly take care of any shifting SWR conditions.
But I would anticipate it would require a DC power source.
Just in case your thinking something like that would provide sufficient
return on investment.
Over the years, I've spent a fair amount of time and investment in
making antennas better, just to find in many cases, it didn't result in
an improvement sufficient to warrant the fuss.  
As I'm getting older, that return on investment factor seems to mean
more each year! :-]
 


> > On Jun 20, 2016, at 7:58 PM, Gary Smith <Gary at ka1j.com> wrote:
> > 
> > I did some spring maintenance on my antennas and need advice on how 
> > to get a 1.1 match.
> > 
> > I have a radial plate with somewhere around 50 130' radials. I have 5 
> > wire antennas attached to this and use an Ameritron remote coax 
> > switch to select which antenna to use. There is a sloper for 160, 
> > INV-L for 80 and verticals for 40, 30 and 20. 17 & 24M are obtained 
> > by selecting either the 160 or 80M antennas. No tuner.
> > 
> > I took the Antenna analyzer down to the antennas today and found 80M 
> > is SWR 1.8, 40 is SWR 1.9, 30M is SWR 2.35 to give some values. The 
> > lowest SWR I could get on 30M is 2.35 and the antenna is cut for the 
> > right length for minimum SWR at 10.100 MHz. This gives me the lowest 
> > SWR on the bands.
> > 
> > I would like to get the SWR down as low as 1.1 at my desired 
> > frequencies If I can do so, but I'm not sure of the best way to do 
> > this. I suspect inductance from a coil at the individual feed points 
> > would work after I get the to SWR dip the lowest at the desired 
> > frequency but if this is the solution, what would be a good way to 
> > know do make such coils for each of the antennas? 
> > 
> > The antennas are 350 feet away, in the woods & onto a salt marsh and 
> > for me, right now, walking is very difficult to do and I want to make 
> > as few trips as possible.
> > 
> > Suggestions appreciated.
> > 
> > 73,
> > 
> > Gary
> > KA1J
> > _______________________________________________
> > 
> > 
> > 
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-- 
 Bw_dw at fastmail.net



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