Inverted V Hookup?

[Jay in the Mojave]

Hello FDTrucker:



You may have to install a Balun inbetween the coax and the dipole elements.



The Dipole antenna has one of its haves or elements connected to the coax shield, and the other half to the center wire in the coax. The center wire can not radiate as its inside the coax shield. But the coax shield will try to have currents running back down the coax that will effect the antennas performance and SWR.



So a Balun is installed between the coax and the dipole elements to do two things. 1- Choke off any sucificant currents going back down the coax shield, and 2- force equal current onto each of the dipole elements. Especially if you use a lot power.



Winding the Coax in a coil to act like a Choke or Balun does not work for me, as I tried this on my beam antennas. So I used a Toroid Core type Balun, and that worked much better. Here are a few sites that should help.



www.arising.com.au/people...MBalun.htm

www.davisrf.com/ham1/baluns.htm

www.amidoncorp.com/aai_cost_baluns.htm



Please let us know how it works out for you.



Jay in the Mojave


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[Lazybones1222]

I run an inverted V double bazooka dipole and have worked most of the US and Canada with it, and several Europe contacts.



It looks like this:

I have it up on my roof on a PVC mast in the inverted V configuration, at exactly 90 degrees with the apex of the angle straight up. The mast is coupled to a PVC roof plumbing vent.



It also talks locally extremely well, and it seems to be omnidirectional. I have done 50 plus miles locally, and I hit the west coast almost daily on SSB. DX Man has heard me in Washinton State on this antenna, even today.



This antenna can be purchased at



radiowavz.com



or on ebay for around $29. That is the 1500 watt version. A 5000 watt version is a little more.



Although the web site shows ham band antennas only, he does 11 meter stuff too. Just call and ask.



Lazy out

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[Lazybones1222]

More info on my antenna from the radiowavz website:



A DOUBLE BAZOOKA antenna is an extremely broad banded Half Wave Antenna which can operate efficiently across an entire Ham band with little change to the SWR. The BAZOOKA antenna design was developed by the staff of M.I.T. in the early 1940's for use by the U.S. Government as a radar antenna. It was modified for amateur radio use in the 1950's.



This unique design eliminates the need for antenna matching baluns and fed directly with 50 Ohm coax.



The DOUBLE BAZOOKA is 98% efficient and typically provides NOMINAL S.W.R. readings of less than 2<img src=http://users.joplin.com/dutch64804/posticon1.gif ALT=":1"> over the entire band.



Since this antenna has no exposed metal wire static charges can not build up thus reducing noise over antennas constructed of exposed wire.



The DOUBLE BAZOOKA antenna will handle full legal limit power with no effect to performance.



The DOUBLE BAZOOKA can be mounted in an inverted "V" configuration for optimum results, "Center elevated, with 90 - 120 degrees between the legs". Then it will have vertical polarization and will usually out perform a dipole type antenna at distances of over 500 miles due to its lower angle of radiation. However the DOUBLE BAZOOKA can be configured horizontally with equally good results. If erected as a Dipole this antenna has horizontal polarization.



This is a single band antenna that does not radiate harmonics, has very little feed line radiation. The antenna consists of a half - wavelength of coaxial line with the outer conductor opened at the center and the feed line connected to the open ends. The inside sections, do not radiate, but act as quarter-wave shorted stubs which presents high resistive impedance to the feed point at resonance and tends to cancel reactance as frequency off resonant frequencies, thus increasing band width. Recently we tried a G5RV and a 20 meter DOUBLE BAZOOKA. WOW !!! What a difference!! On the G5RV all we could hear was noise. Switched over to the DOUBLE BAZOOKA and started listening to a QSO in progress. Just wanting to make sure we were not just picking up a fluke. We switched back over the the G5 and heard nothing but static!! We when up and down the band with similar results.







The Radiowavz DOUBLE BAZOOKA is made to handle even the toughest environments. The Coax center conductor is copper coated steel. The shield is 100% so you don't have to worry about the elements. It is made to be easy to deploy, easy to use, strong and durable.



This is the perfect antenna for that favorite band!!!!.



This antenna is great for stealth work. As it is flat black, insulated it can be placed in trees, under eaves or next to house trim even in attics. Its ends can be bent to accommodate unusual spaces.



Radiowavz offers the Double Bazooka antennas for ALL HAM bands CAP, MARS, Government and public service frequencies. If you do not see it listed, drop us a line or e-mail and arrange for that custome frequency.



The 11 meter one rocks!!



If you would like to see a pic of mine installed on my house - pm me.

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[Lazybones1222]

Ok - a few have asked for a pic so I will just post a link here cause it is a big pic.



It is mounted on a plumbing vent with a $3 coupling from Home Depot. The mast is PVC and I used bungees to tie it off.



It has taken some severe wind storms and has had no problems. The pvc pipe weighs way more tha the antenna. It is a light easy cheap set up that gets out real good.



It is in the upper right side of the pic and the back of my house is facing due north.



Comments please - except for steppinstone - he will tell me my plants need watered. The radio room is that door on the lower left, and that is a 1200 gallon fish tank, not a hot tub with the ivy growing on it. haha.



Lazy back out.



My house and bazooka dipole here

</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=lazybones1222>Lazybones1222</A> at: 1/3/05 2:11 pm

 

[Lazybones1222]

Well, be that as it may, I have mine tuned for 11 meters with a 1.2 swr, and it just plain makes the trip.



I do believe DX Man has some credibility on this forum. I plugged his ears as the strongest station he heard today in DX Land from Atlanta to Washinton State (3000 miles?) on my bazooka dipole. It works for me.



Proof? Click this link:



My Bazooka Works - Click here



Oh, and by the way, I live in a covenant restricted neighborhood. "No antennas allowed. This antenna is invisible from the street, so it is the best I can do. I would really love to have a big @#%$ beam. I got the money to do it. Just ain't allowed. <img src=http://users.joplin.com/dutch64804/donotknow.gif ALT=":donotknow"> Best tool for the job in my circumstances.



<img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26">

</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=lazybones1222>Lazybones1222</A> at: 12/30/04 10:51 pm

 

[Lazybones1222]

<blockquote>Quote:<hr>Lazybones.....is that the antenna that you talked to me on? If so I am impressed! DX MAN<hr></blockquote>



Yes it is DX Man. I know my antenna is a compromise. And BTW - it is the only antenna I have ever used.



Again, I can't put up a real antenna where I live due to restrictions, so it is the best I can do.



Lazy out

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[Lazybones1222]

An inverted V 90 to 120 degrees will be omni-directional.

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[Lazybones1222]

<blockquote>Quote:<hr>the inverted V is an interesting antenna. it's nothing more than a "modified dipole". <hr></blockquote>



True - however, the double bazooka is made from coax, not wire, and one side only is hot or radiating RF.



The center conductor from the radio's coax connects to the coax shield of one side of the inverted V center fed antenna, the shield of the radio's coax connects to the inner wire of the other leg of the antenna coax. 10-4?



Also, it radiates better than a wire dipole because of the larger diameter of the coax.

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[Lazybones1222]

yeah - I knew that.



<span style="font-size:xx-small;">whispers to others</span>



What did he say?

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[Lazybones1222]

<blockquote>Quote:<hr>Seriously though, should that configuration be at a right angle? I still have mine up but its at a flatter, 130 degrees or so.<hr></blockquote>



The directions I got from the manufacturer, radiowavz.com , said it can be set up flat, as a sloper , or for a more omnidirectional application - to put it at 90 to 120 degrees. 90 was easier because of the droop of the spreaders.



I just talked to CDX 1143 in Billings Montana from Atlanta GA about a half hour ago, so it does get out. The ends are east west. I have talked to Seattle, Maine, Cali, Baja Penisula in Mexico, Costa Rica, Bahamas, all along the Great Lakes and Ontario, and even Belfast Ireland and Liverpoole England. So my practical experience is that it is somewhat omnidirectional, but does prefer the north. The pic in the link above - the back of my house shown faces due north.



I know it's not the most effecient set up, but given my stealth mode of operation, it works for me. <img src=http://users.joplin.com/dutch64804/posticon25.gif ALT=":25">



Later,

Lazy

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[Fdtrucker]

I just made an inverted v for 11 meter. Just wondering if I hooked it up right. The shield of the coax feed line is hooked up to one side and the center to the other. Is this correct? Or does the shield terminate and the center line feeds both sides.. <img src=http://users.joplin.com/dutch64804/posticon44.gif ALT=":44">


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[Lazybones1222]

You are welcome. I may not always know what I'm talking about, but I do know it works. <img src=http://users.joplin.com/dutch64804/0pouce.gif ALT="ounce">

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[Lazybones1222]

Both AM and SSB actually. When conditons are right I can do AM all along the Great Lakes and Canada, depends on the conditions. As I said before my antenna favors the north, but, I have talked to the west coast many times as well on AM.



SSB - well nothing is out of the question. DxMan and Audioshockwave have talked to me on that dipole - both on the west coast.



With the 11 year skip cycle nearing the low point it is much easier on SSB now of course, but from time to time, AM is still in there.

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[Lazybones1222]

I am mostly on the regular 40 channels, 38 LSB when it is rolling, 28 on am.



BTW _ Proof of recent contact:



Click here

</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=lazybones1222>Lazybones1222</A> at: 1/9/05 9:15 pm

 

[KD5VHF]

Oh come on Doc, You mean to tell me you don't enjoy those pretty blue sparks between the coils and things that go POP ?<img src=http://users.joplin.com/dutch64804/posticon1.gif ALT=":1"> <img src=http://users.joplin.com/dutch64804/posticon26.gif ALT=":26">


<hr />73, Mike

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