[OKDXA] VU7 on 160m

[Kim Elmore]

Hi Jim,

Thanks for the info. I've shunt fed it before at a different QTH and 
so know the drill.  I never knew the impedance, though, so I 
brute-force matched it with my antenna tuner. All wiring is on the 
inside and it all runs underground from there, so I'm set up 
well.  WIll have to add radials, though. An inverted L will need 
another support that I don't have handy and I've never had any luck 
feeding a half-sloper from it on 160 m.

Time for some experimentin'!

Kim

At 12:47 AM 1/23/2007, you wrote:
>Kim, I shunt feed my tower that is 65 ft to first ant and 8 more ft 
>to the second.  I use a shunt out 18 inches from the tower and 
>shorted at about 40 ft.  I use a capacitor only in series with the 
>shunt.  I think it is 530 pfd.  I found it takes quite a bit of 
>experimenting to get the shunt short point and the capacitor 
>setting.  An Antenna analyzer helps a lot.  You are looking for a 
>resonant point and impedance as close to 50 ohms as possible.  Do 
>the best you can to get a minimum swr then try it out.  You will 
>also need as many radials as you can get, at least 16 but something 
>like 64 is better.  Also, all cables coming down the tower must go 
>all the way to the ground preferably inside the tower. Any 
>questions, drop me a note. Jim