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Which dipole

Help with installing an Antenna, or just choosing the right antenna to go with your radio, or your mobile.

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cliff hanger
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Which dipole

Post by cliff hanger » Thursday, 03 November 2016, 10:29 AM

This is the first post I've made. I live in a small valley in Oregon surrounded by hills. I'm using a galaxy 2547, 100 watt amp, and a sirio gps 27 5/8 wave antenna mounted 20 ft off the ground. This works great for local but not dx. Looking at a dipole but as they are semi directional I don't know if a horizonal wire dipole or a sirio d27 with a small rotor would work best. I have a spare 24 Ft mast I could install.I was into cb back in the early 60's. Back then my call sign was KPC 0722. Skip was easy to work back then. Any imput wii be appreciated


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Re: Which dipole

Post by 543FtWorth » Thursday, 03 November 2016, 13:07 PM

The performance will be about the same between the 2 but it's easier to rotate the sirio and it doesn't need to have the ends supported. For the price I would build my own dipole.

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Re: Which dipole

Post by G9L » Friday, 04 November 2016, 15:11 PM

Hello. Your problem are the hills. A vertical antenna will radiate at between 10 to 30 degrees. If the signal hits the hills it won't go any further. I concur that the dipole probably won't be any different. Not only that, but you will lose your local range with a horizontally polarized antenna, unless your buddies also use horizontal antennas, and that would not be the case for mobiles. The losses between a vertically and horizontally polarized antennas are around 20db, that's 100x less signal RX/TX. I would suggest keeping your vertical antenna. Maybe try a half wave end fed, 17ft vertical with an end fed tuner at the bottom.

To go past the hills, if they surround you, you would need a horizontal dipole but for a lower frequency, between 3.5 and 7mHz for NVIS, and that means a Ham radio and Ham license.

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Re: Which dipole

Post by 543FtWorth » Saturday, 05 November 2016, 4:38 AM

I think there are still going to be times when a horizontal dipole will be an advantage for DX. Most of us have enough scraps laying around to build one so I would at least give it a try.

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Re: Which dipole

Post by MDYoungblood » Saturday, 05 November 2016, 7:10 AM

Hello cliff hanger,
Welcome to the forum. Making a dipole is easy and fun, here are a couple of examples.
st_dipole_configs.png
You can search out the dimensions on the web,there are calculators for frequency to length. The inverted V is the most practical because the lower ends help the impedance of the antenna. With you being in Oregon positioning the ends of the dipole north and south will give a signal east and west, should cover most of the USA.
I see you are a new member, could you post a intro in the "Welcome to the Forum" topic, viewforum.php?f=89" onclick="window.open(this.href);return false; so others can say "Hi", thanks.

3's

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Re: Which dipole

Post by cliff hanger » Saturday, 05 November 2016, 18:26 PM

I plan on keeping my verticle antenna for local. I will put up another mast and another antenna. I have a yeasu rotor i will use on the second mast, i'm wondering what antenna to us for dx. It doesn't have to be a dipole, could be a moxom or small horizonal beam if these would work better, just looking for answers. I've got another 24 ft mast I can put up.I receive skip from east and south but can't reach back with my set-up. This valley is like a bowl about a mile wide. and the hills surround it. The hills are only about 800 ft high. I know skip is hit or miss but my set-up is all miss. any suggestions will be helpful. I wll post on the welcome tomorrow. Thanks

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Re: Which dipole

Post by HomerBB » Monday, 13 February 2017, 22:53 PM

I realize this thread is a little aged, but wanted to offer my viewpoint on it for future help.

Whether you build it or buy it, the Moxon would be an excellent choice. It is small, lightweight, and has good gain with excellent rejection to the sides and back. If its DX you wish to work, the directional gain will give you an advantage over the bi-directional dipole at 26' height.
That said, two inexpensive fishing poles mounted opposite each other on a PVC tee and short PVC nipples with a, $4 extension cord split in two will have a self supporting dipole in the air in a few minutes.

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Cutting off the female block of a 9' household extension cord and spreading the two conductors results in an instant dipole. Connect the feedline to the two male prongs of the cord, and tune by turning back each end of the wires equally.
Put a female cord receptacle on the end of the feedline and plug your dipole in it for easy portability
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