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Anyone ever try a loop antenna?

R

radio8z

Hello all,

Just a thought in the form of a question.

Please forget the legal arguements about radiating length for a moment and focus on the technical aspects.

Hams use what is called a quad antenna (basically just a big loop) which is an insulating frame supporting many turns of wire in a square pattern. This antenna can be tuned with a capacitor to properly load a transmitter.

Has anyone tried this for Part 15 AM?

I have, in the past, built one for receive and it worked great. The only artifact was that is was bi-directional. This was an advantage for receiving because I could rotate the antenna and null out intereference. Wonder how it would work for transmitting.

Neil
 
Re: Another thought DDRR

>After I posted the above about the loop antenna, I had another thought. There is an antenna that was developed for the Navy. It is called the Directional Discontuinity Directional Ring Radiator (DDRR for short.).

Google it or check it out in the ARRL antenna book. This thing will simplify the grounding requirements and can easily be built to comply with the 3 meter length requirement. The big question is "will it work?".

Any comments?

Neil
 
Re: Another thought DDRR

> >After I posted the above about the loop antenna, I had
> another thought. There is an antenna that was developed for
> the Navy. It is called the Directional Discontuinity
> Directional Ring Radiator (DDRR for short.).
>
> Google it or check it out in the ARRL antenna book. This
> thing will simplify the grounding requirements and can
> easily be built to comply with the 3 meter length
> requirement. The big question is "will it work?".
>
> Any comments?
>
> Neil
>

My dad built a 4' loop, ungrounded, and used it with an entry level Ramsey transmitter.
The signal MAYBE went 80 to 100 feet or so before getting buried in the noise on a walkman. Personally, I would have prefered to have it still overloading the front end on that same radio.
 
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