The 102" SS Whip Antenna

[Lazybones1222]

I have some pics at home I will post tonight if I remember.



The 102 is a cheap EXCELLENT 11 meter antenna. Period.



This is a very controversial topic though. Many love the Predator 10k better than the whip and will surely say so. I wouldn't trade my whip for any other antenna..

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[subs757]

The 1/4 wave whip is good, you cant really beat it, but it has its dissadvantages......mainly size. You generally cant do the McDonalds drive throughs in the UK with a 102" whip !!!

Oh yeh the SWR changes at high speeds mainly because it bends so easily with wind force, cornering can cause injuries to pedestrians lol.



The 10K is a very good antenna, as most would say the next step from the 102". In fact the 10K is about the best you are gonna get. It stays solid, is bloody good and a proven product, wish i had one.



For the 102" you will need a good mount, a tri mag if you are not going to fix permenantly. Experiment with the mounting position but best on the roof.



If I where you I would get the 10K.


26 CDX 757, One of Our Subs - subs757
mobile with RCI2970 Astatic575 Sirio 7/8th @120w back at base Yaesu FT757GX Datong FL3 filter Astatic575 3ele Sirio yagi @130W

More than 2000 people are injured by teapots each year in the UK !</p>

 

[Lazybones1222]

<blockquote>Quote:<hr>A 50 ohm resistor will also give you a flat SWR, but it doesn't make a very good antenna<hr></blockquote>



<img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin"> <img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin"> <img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin"> <img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin"> <img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56">

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[jessejamesdallas]

Mag mounts will hold the 102" whip...till you hit your first tree limb! And you will hit tree limbs with that set-up. And if its on the roof, you will be hitting bridges, phone lines, stop lights, and low flying air-planes!



Best bet...Predator 10K. Cost alittle more, but worth every penney.

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[Lazybones1222]

hahaha - Told you this would start a debate!



Here are the pics I promised. Even though my setup is theoretically directional, I have talked to Idaho from Atlanta while heading east. When at speed, I don't get any more reflect cause there is no truck back there!!



The big zip tie keeps the spring from laying back at highway speeds. In this set up, the SWR does NOT change as the whip bends. This is a true saying.



Click on the links for a big pic:



pic 1



pic 2

</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=lazybones1222>Lazybones1222</A> at: 1/18/05 2:02 pm

 

[hossless]

Excellent antenna. Best receive of any mobile antenna I've used.



Hossless


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[hossless]

Well, I'm not an antenna GURU, but I've done tests on my own with the 102" whip and Coily's and 10k's. I have found that the 102" whip receives a wee bit better than the comp style coil antennas, and the Coilys and 10k's put out better audio.



Hossless


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[mack2000]

The difference in 102'' and 108'' is the addition of a spring in the mounting which adds the 6'' of length and if I'm correct it's only needed when a sufficient counterpoise is not available.


"the only scope in that dc communications trailer is to cover up the crack breath.."

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[chrismoll]

I have heard that this is excellent antenna. Does anybody have any pictures of it installed? Anybody have any input on this antenna??????<img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon62.gif ALT=":62"> <img src=http://users.joplin.com/dutch64804/posticon56.gif ALT=":56"> <img src=http://users.joplin.com/dutch64804/wav.gif ALT=":wav">


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[Lazybones1222]

Hello i just installed a brand new double coily antenna and it beat the steel whip by a full s-unit

I read these examples of how a coil antenna beats a full 1/4 wave whip whip many times, but can anyone explain WHY this would take place.



I can't figure it out. <img src=http://www.wwdx.org/smilies/posticon60.gif ALT=":60"> <img src=http://www.wwdx.org/smilies/posticon53.gif ALT=":53">

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[Moleculo]

Lazy, there's two reasons I recall off the top of my head: One is that with a properly designed coil, the angle of radiation will be lower than the whip. The other reason is with a 1/4 wave vertical in a mobile application, some RF is lost to ground. Some energy travels back down the antenna and is radiated at the ground. The coil kind of "traps" this and causes the RF to radiate outward. There's a couple of pages on this subject in the ARRL Antenna book. However, all that said, the coil has to be designed properly.



As far as the claims made above, I think some detail needs to be paid attention to. First of all, the comparison was between a 102" whip on a regular vehicle and a cophased dual antenna setup on a semi. A properly cophased dual array should have an elliptical radiation pattern that is more directional to the front and back than the sides. The semi clearly has a significant height advantage over the car, as well. He also doesn't tell us anything about the radios being used, how much power they're putting out, etc. We also don't know anything about how the whip was installed on the other vehicle.



Moleculo


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[Lazybones1222]

Really. I did not know that. <img src=http://www.wwdx.org/smilies/posticon53.gif ALT=":53">

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[Lazybones1222]

The only 'absolutes' about antennas is that almost anything can be one, some are 'better' than others in particular situations, and the one before last was always the 'best' you've ever had... except for the next one.

Now that I understand. <img src=http://www.wwdx.org/smilies/posticon25.gif ALT=":25">

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[Moleculo]

Doc, I went back and did some reading in the ARRL Antenna book. In Chapter 16, there's a section on current distribution with a coil loaded mobile antenna as compared to a 1/4 wave straight vertical. It discusses that with the properly designed coil, placed at the proper height within the antenna, that current is fairly constant all the way up to and through the coil, thus "forcing" more current higher up in the antenna. It also states that "This higher current flow results in more radiation than would occur from the equipvalent section of a quarter-wave antenna" A couple of questions. With more constant current up and through the coil, wouldn't that affect the radiation angle? Also, doesn't that give some explanation to the question asked? Also there's some discussion in the same chapter on long thin coils and other variations on coil designs that are detrimental to performance ("radiation from long thin coils allows the current to decrease...")????


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