V-NET ANTENNA

[Needle Bender]

hey marconi, wanna run this on your eznic? begining with a verticle centerfed 1/2 wave dipole in the center the top of the dipole turns left (the bottom turns right) 90 degrees and goes horizontle for 1/2 wave then turns 90 degrees again and goes verticle down 1/2 wave then repeats, 90 to horiz then 90 to vert until you have 4 horizontles and 4 verticles on each side, but looking down on it looks like a 90 degree V in the direction you want the signal to go like a v-beam made like a zig-zag 'net'.
a friend of mine came up with this idea on the air yesterday so I thought id ask what you could do with it on your eznic

so like this
.....__.....__.....__.....__
|__|..|__|..¦__|..|__|..| about 144 feet wide before bending 90 degrees forward from the middle

but not flat across the front but in a forward V at 90 degrees toward the receiving station from the driven centerfed dipole in the middle
i want to know the gain of both the verticle and horiz and the pattern
brad 049 was saying it should do both with about 6dbd gain but he said hes just guessing

 

[Marconi]

hey marconi, wanna run this on your eznic? begining with a verticle centerfed 1/2 wave dipole in the center the top of the dipole turns left (the bottom turns right) 90 degrees and goes horizontle for 1/2 wave then turns 90 degrees again and goes verticle down 1/2 wave then repeats, 90 to horiz then 90 to vert until you have 4 horizontles and 4 verticles on each side, but looking down on it looks like a 90 degree V in the direction you want the signal to go like a v-beam made like a zig-zag 'net'.
a friend of mine came up with this idea on the air yesterday so I thought id ask what you could do with it on your eznic

so like this
.....__.....__.....__.....__
|__|..|__|..¦__|..|__|..| about 144 feet wide before bending 90 degrees forward from the middle

but not flat across the front but in a forward V at 90 degrees toward the receiving station from the driven centerfed dipole in the middle
i want to know the gain of both the verticle and horiz and the pattern
brad 049 was saying it should do both with about 6dbd gain but he said hes just guessing

Here it is at 27.205 using .25" copper @ 10' feet above the ground. The match will require a big tranformation to work.

View attachment NB's V Net idea at 10'.pdf

 

[Needle Bender]

damn your good at that eznic. thanks for running that. i hope it didnt take to much efort.
what i dont get is why the swr is so far off. i went to field day last summer with a ham friend and he made a real similar antenna but his swr was lower then 2:1.
the difference was his used a folded 1/2 of 450 ohm as phazing lines between the 1/2 waves added to the ends of the centerfed dipole and the 1/2 wave elements were all horiz like the dipole. must have somethnig to do with the polarization shifting from vert to horiz every 90 degrees
i wonder what it would look like if it was one full wave above ground?
i wonder if adding a 1/4 wave as the last element on each end would lower the swrs?
thanks again marconi

 

[W5LZ]

Sorry, it doesn't have anything to do with polarization. It does have to do with the phasing between each element of the array. No matter it's shape, there is no phasing between 'elements' of your antenna since there are no separate 'elements' in your antenna, it's just a 4 wave length doublet. The 'similar' antenna you saw was a phased horizontal array.
Would adding a 1/4 wave length on each end change it's impedance? Yes, it would lower it.
- 'Doc

 

[Needle Bender]

hi doc.
so we thought that by folding it every 1/2 wave it would act like it was phazed because of the 20db seperation between horiz and vert but would radiate in both polaritys because brad has a couple cedar trees about 120 feet apart 100 feet from his house so he was thinking of building it for easternly dxing

 

[Captain Kilowatt]

That antenna looks like a Bruce Array. I suspect it may have better gain and a tighter pattern if it were in a straight line and not VEE shaped. I am just basing that on what the regular Bruce array will do.

 

[Marconi]

damn your good at that eznic. thanks for running that. i hope it didnt take to much efort.
what i dont get is why the swr is so far off. i went to field day last summer with a ham friend and he made a real similar antenna but his swr was lower then 2:1.
the difference was his used a folded 1/2 of 450 ohm as phazing lines between the 1/2 waves added to the ends of the centerfed dipole and the 1/2 wave elements were all horiz like the dipole. must have somethnig to do with the polarization shifting from vert to horiz every 90 degrees
i wonder what it would look like if it was one full wave above ground?
i wonder if adding a 1/4 wave as the last element on each end would lower the swrs?
thanks again marconi

'Doc is right, the resistive part of the impedance is lowered about in half, but the reactive part goes way up...with a modest reduction in SWR. There was no change in gain going higher, but the angle dropped down from 20* to 10* degrees, and that looks good.

I'd just put up a nice beam.

I forgot to change the model's caption to show 36' feet.
View attachment NB's V Net at 36'.pdf

 

[AudioShockwav]

Captain has a mind that stores info like a hard drive......
Kudos Sir.

See the Link below fro Rudy Severns, N6LF

http://rudys.typepad.com/ant/files/antenna_array_80160m.pdf

He is building for 80 and 160 meters, feeding it with 450 ohm ladder line and a 9:1 balun


73
Jeff

 

[Marconi]

Captain has a mind that stores info like a hard drive......
Kudos Sir.

See the Link below fro Rudy Severns, N6LF

http://rudys.typepad.com/ant/files/antenna_array_80160m.pdf

He is building for 80 and 160 meters, feeding it with 450 ohm ladder line and a 9:1 balun


73
Jeff

Looks like a fractal nightmare to me, and probably not worth the effort.

 

[Captain Kilowatt]

Captain has a mind that stores info like a hard drive......
Kudos Sir.

See the Link below fro Rudy Severns, N6LF



http://rudys.typepad.com/ant/files/antenna_array_80160m.pdf

He is building for 80 and 160 meters, feeding it with 450 ohm ladder line and a 9:1 balun


73
Jeff

Yes and it has been known to freeze up and crash on the odd occasion too.

Looks like a fractal nightmare to me, and probably not worth the effort.

Pretty hard to get that type of gain on 80 or 160m unless you go with something like that. Cheap but lots of work and it also has the WOW factor. You know WOW .......Wonderful Old Wire.

 

[Needle Bender]

ok i guess brad and me werent the first to think of it. so what else is new:mellow:
hey marconi, what do you get when you flatten it out at 36'?
does folding the last 1/4 wave in instead of out change anything?
what is the broadside horiz pol pattern like compared to the vert polarization?