I got bored one night...

[Moleculo]

...so I took this piece of LMR-400 with a PL259 attached to it that I cut off at some point. Then using some some wire and an SO-239 I had laying around, I made a little 1/4 wave 440 mhz groundplane antenna out of it that I could attach right to the back of my dual bander that I have in the shack. While checking it on the meter, I just trimmed it a little at a time until I got the SWR down around 1.8:1. Here's a pic:

I have no idea what I'm going to do with it....I guess I just decided to entertain myself

Moleculo


</p>

 

[Moleculo]

...so I took this piece of LMR-400 with a PL259 attached to it that I cut off at some point. Then using some some wire and an SO-239 I had laying around, I made a little 1/4 wave 440 mhz groundplane antenna out of it that I could attach right to the back of my dual bander that I have in the shack. While checking it on the meter, I just trimmed it a little at a time until I got the SWR down around 1.8:1. Here's a pic:

I have no idea what I'm going to do with it....I guess I just decided to entertain myself

Moleculo


</p>

 

[main]

Re: Coaxial dipole

I'm fortunate enough that I can have radios at the shop where I work so I really didn't need to make this antenna. But a friend wants to use her HT in her house and the rubber duck just ain't making it. So last night (actually a few nights ago) while sitting in the shop I decide to make this coaxial dipole for 2 meters. Used some old RG 59U and strung it up in the rafters, hooked up my ft 50r and was hitting repeaters that I could'nt get with the rubber duck. It's not your usual dipole but works great. Makes a great backpack or emergency antenna. I added small lug terminals to the ends to make it easy to string it up. Had to do this three time because the antenna kept coming out too long but I finally got the swr down to 1.2:1.

www.hamuniverse.com/ve3sqbprog.html




Main





</p>

 

[main]

Re: Coaxial dipole

I'm fortunate enough that I can have radios at the shop where I work so I really didn't need to make this antenna. But a friend wants to use her HT in her house and the rubber duck just ain't making it. So last night (actually a few nights ago) while sitting in the shop I decide to make this coaxial dipole for 2 meters. Used some old RG 59U and strung it up in the rafters, hooked up my ft 50r and was hitting repeaters that I could'nt get with the rubber duck. It's not your usual dipole but works great. Makes a great backpack or emergency antenna. I added small lug terminals to the ends to make it easy to string it up. Had to do this three time because the antenna kept coming out too long but I finally got the swr down to 1.2:1.

www.hamuniverse.com/ve3sqbprog.html




Main





</p>

 

[2IR473]

Re: Coaxial dipole

Moleculo,



thats a neat little GP you made there.

Keep experimenting when you are bored...

it will keep you out of trouble <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol">



Main, thanks for that link. That looks like a good site.




<span style="color:yellow;">Paul</span>

<span style="color:yellow;">CDX8412</span>

<span style="color:yellow;">OT8412</span>

</p>

 

[2IR473]

Re: Coaxial dipole

Moleculo,



thats a neat little GP you made there.

Keep experimenting when you are bored...

it will keep you out of trouble <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol">



Main, thanks for that link. That looks like a good site.




<span style="color:yellow;">Paul</span>

<span style="color:yellow;">CDX8412</span>

<span style="color:yellow;">OT8412</span>

</p>

 

[main]

Re: Coaxial dipole

Using the information provided in the above link I built another coaxial dipole style antenna. Replaced the copper braid with 3/4 copper pipe. Used automotive heater hose for the dielectric and 3/8 copper pipe for the center conductor.



From 137.0 to 155.0 swr is 2.0:1 and lower.



144.0 swr is 1.2:1

148.0 swr is 1.3:1








Main





</p>

 

[main]

Re: Coaxial dipole

Using the information provided in the above link I built another coaxial dipole style antenna. Replaced the copper braid with 3/4 copper pipe. Used automotive heater hose for the dielectric and 3/8 copper pipe for the center conductor.



From 137.0 to 155.0 swr is 2.0:1 and lower.



144.0 swr is 1.2:1

148.0 swr is 1.3:1








Main





</p>