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2 meter antenna plans

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

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jomama
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2 meter antenna plans

Post by jomama » Thursday, 15 November 2012, 6:11 AM

Can anyone tell me if how to make a 2m antenna??
Hopefully from alu. tube>>>>>
Thanks Jomama


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Re: 2 meter antenna plans

Post by Night Crawler » Thursday, 15 November 2012, 7:22 AM

What kind do want to make vertical, horizontal, omni-directional, directional, a beam, 5/8 wave, 1/2 wave, 1/4 wave?

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Re: 2 meter antenna plans

Post by dirtyjob » Thursday, 15 November 2012, 7:28 AM

i run a jpole for 2 meters like this one and hit repeaters 40 miles off no problem

Browning Golden Eagle Mark IVA - Mark III & Mark II
"LISTEN FOR THE PING"
Kenwood TS-590S - Yaesu FT897D - W2IHY 8 Band EQ - W2IHY EQPlus
Yaesu FT-101E - Tram D201A - President Lincoln - CP2000
Gizmotchy G-31 Beam
Super Penetrator 500 5/8 Wave
Comet GP9 2 meter/440
"North East Corner Of Massachusetts 613"
CBRT 18204

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Re: 2 meter antenna plans

Post by The DB » Thursday, 15 November 2012, 7:32 AM

2 Meters on a CB forum?

Aluminum tubing is a bit thick for this application I think.

Get an so239 plug, and some solid rod small enough to fit inside the PL-259 plug.

Solder one rod that is about 19.5" (I would go a little longer so I can cut it to length when I use an antenna analyzer or an SWR meter to tune it) into the center connector. The radials should be between 20" and 20 1/2" (try and keep them the same, although this is not absolutely required), a loop built into the ends, and bolted the the four holes in the pl-259 connector. I would use stainless steel nuts bolts and washers here. You then bend the radials down about 45 degrees.

If you want to mount this up it can be attached fairly easily to the end cap of a PVC pipe with a few holes cut in it. If you do it this way I would wait for the pipe to be attached before bending the radials down. You can use the hardware that attaches the radials to also attach to the PVC pipe. The PVC pipe can attach to a mast with U bolts or even zip ties. The PVC pipe can also be used as the mast itself if it isn't to long. The coax feed line would simply run up the PVC pipe to the antenna.

Tuning this antenna with an SWR meter is just like tuning any other antenna with an SWR meter. If you made it long by design cut to length. You can also adjust SWR by adjusting the angle of the radials.

If using an antenna analyzer you cut to resonance (you did make it a little long by design didn't you?), then you can adjust the angle of the radials for SWR matching.

NOTE: These antennas are much shorter than CB antennas, and are more sensitive to length changes when tuning. When cutting do not cut to much at a time or you will cut it to far.


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Re: 2 meter antenna plans

Post by 'Doc » Thursday, 15 November 2012, 9:01 AM

The first step is to decide what kind or type of antenna you want, 1/4w, 1/2w, 5/8w, etc. Then, it's like making an antenna for any other frequency, you figure what the length will be. For example, a 1/4 wave on 2 meters is something close to 19" long. So, like a groundplane antenna, one element sticking up 19", a couple/few radials sticking 'out' about 19" too. A 1/2w dipole would be two elements a 1/4 w long on either side of a center feed point.
It's just a different 'size' in relation to an antenna for any other band. That 19" thingy is a very general length, for any specific frequency that length will change a little bit. Just more normal 'tuning', you know?
What size wire, tubing, whatever? That's more a mechanical thingy than electrical. It would have to be of a size that will normally hold it's self up with no problems. Bigger than required isn't a problem until the diameter get's to something like a 1/10th of a wave length, then it get's sort of 'odd', kind'a. For 2 meters that 1/10th of a wave length would be in the neighborhood of around 8" in diameter. I think that would be sort of unusual, right?
So... what'cha got in mind?
- 'Doc


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Re: 2 meter antenna plans

Post by MDYoungblood » Thursday, 15 November 2012, 12:38 PM

If you can make a nice clean bends and make connection in the tubing you have a j-pole. If not scrap the aluminum and go buy some copper tubing. They are the easiest to make and the plans are readily available off the internet.

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Re: 2 meter antenna plans

Post by dirtyjob » Saturday, 17 November 2012, 15:08 PM

mine was made by this guy:

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i use it on 2 meters and 70cm
Browning Golden Eagle Mark IVA - Mark III & Mark II
"LISTEN FOR THE PING"
Kenwood TS-590S - Yaesu FT897D - W2IHY 8 Band EQ - W2IHY EQPlus
Yaesu FT-101E - Tram D201A - President Lincoln - CP2000
Gizmotchy G-31 Beam
Super Penetrator 500 5/8 Wave
Comet GP9 2 meter/440
"North East Corner Of Massachusetts 613"
CBRT 18204

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