Random wire antennas

[Heavy Metal]

Ok, saw a posting on a Web site went something like this on rand on dipole lengths.

22' x 2
33' x 2
44' x 2

66'
88'


And talked about 4:1, 6:1, 8:1 and 9:1 and 12:1 baluns used can have vertually a very broad band dipole antenna and vertually no tuner needed and under 2:1 to under 1.5:1 and under swr on a majority of bands, facts and truth to this and are the about lengths each side or divide it into 2 for overall legnth? And what ratio balun would be needed to achieve this. Using 50 ohm coax cable or what to achieve it.

 

[Beetle]

"Random" means there's no measuring done at all. Pick a length AT RANDOM (disregarding the frequency you plan to use) and cut the wire.

 

[wavrider]

not really random here are a few lengths that may or may not help you in your project

http://www.hamuniverse.com/randomwireantennalengths.html

http://udel.edu/~mm/ham/randomWire/

http://www.w8ji.com/long_wire_antenna.htm

 

[Heavy Metal]

Wavridee, read those, this is something were 33 66 88 feet could render certain bands, they were talking harmonics 2nd 3rd even 4th harmonics, and using a balun of 4:1 to as high as 12:1. I take it to give u derived 2:1 SWR on edges and in some cases to pull odd bands in by tuner and even up to a point were their but you had one end vs other, cw vs phone band side.


Not sure if I am actually conveying thus right.

 

[Heavy Metal]

These random lengths were stated as 33 44 66 88 and you got certain bands

 

[DainBramage]

... they were talking harmonics 2nd 3rd even 4th harmonics, ...
Not sure if I am actually conveying thus right.

I don't think , without certain equipment, you really want to transmit into antennas that are resonant on the even harmonics, VSWR isn't the only issue..... YMMV


"These random lengths were stated as 33 44 66 88 ..." re-read post #2

 

[Tallman]

http://www.wv8kfa.com/p/antennas.html
Those wire lengths work really well with the "QSO King" antennas. Once you get past 44' in length it will get the 160 meter bands. It is money well spent if you buy one of these. It is what I run here and make contacts all the time with it.
End fed antennas get into all kinds of electronics though. I do not run any power here because of that issue.

 

[Heavy Metal]

http://www.wv8kfa.com/p/antennas.html
Those wire lengths work really well with the "QSO King" antennas. Once you get past 44' in length it will get the 160 meter bands. It is money well spent if you buy one of these. It is what I run here and make contacts all the time with it.
End fed antennas get into all kinds of electronics though. I do not run any power here because of that issue.

The dimentions as mentioned above were dipoles, I live now in suburbia lol, close to others why looking back at theses, was out in could try were had no worry about it, since neighbors were quite a ways off. Now I have to why away from that and also limited too..

 

[wavrider]

The dimentions as mentioned above were dipoles, I live now in suburbia lol, close to others why looking back at theses, was out in could try were had no worry about it, since neighbors were quite a ways off. Now I have to why away from that and also limited too..

Looks like auto correct on an i phone, can not figure out what you are trying to say

Basically, just use what you can fit into your lot and see how it works for you, no one can tel you exactly how your antenna is going to perform, just try it and find out.

Don't worry if there is any problems I am sure your neighbors will be knocking on the door

 

[Tallman]

Don't worry if there is any problems I am sure your neighbors will be knocking on the door

Not my neighbors! The horses butts call the FCC with out even talking to me at all.
I put up a single pole mast right at 50' and they called the FAA since we are in the approach glide path of the International air port. We are 8 miles from the airport. The aircraft are over 500' above ground level when the pass over my house and they are about 600' south of my house. My station has been inspected by both agencies as has been found in compliance with both regulatory bodies. I think just for grins I'm going to put my big amp on line just to see what happens.

 

[wavrider]

Sounds like a nice neighborhood.

Run the amp you have the license to, 75 meters an amp is usually needed to get over all the QRM,

 

[Road Squawker]

...I put up a single pole mast right at 50' and they called the FAA.... My station has been inspected by both agencies as has been found in compliance....

really? unless your tower is >200 feet, the FCC doesn't care.

per 97.15 (a)

 

[Captain Kilowatt]

Looks like auto correct on an i phone, can not figure out what you are trying to say

You are not alone on that. I have had trouble with a lot of posts like that. Part of the challenge of answering correctly is deciphering the question in the first place.

 

[Captain Kilowatt]

really? unless your tower is >200 feet, the FCC doesn't care.

per 97.15 (a)

Maybe the FCC does not care but the FAA does due to proximity to a public use airport. His 50 foot tower is fine at 8 miles out but nasty nosy neighbors may not know that............or care.

 

[Heavy Metal]

Think this is what I was seeking:

Broadside Doublet Lengths and Amateur Band Coverage
Length (feet) Bands covered
44′ 10, 12, 15, 17, 20, 30, 40 meters
66′ 15, 17, 20, 30, 40, 60 meters
88′ 20, 30, 40, 60, 80 meters