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The Unofficial iPad Amateur Radio Club

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twerppoet

twerppoet

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I've discovered the matrix.

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twerppoet

twerppoet

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I've been playing with a SDR (Software Defined Radio) for a couple weeks now. I bought an SDRPlay RSP Pro, a Wonder-Wand HF tuner/antenna, an MFJ-9232 loop antenna tunner, and lots of other odds and ends.

Turns out that like most other radios, the antenna is the most imporant part, epspecially on HF. I've experimented with a couple, and so far a loop conected to either the Wonder-Wand or MFJ-9232 has worked best. So, I decided I wanted something portable, easy to take on the road and set up anywhere.

I built this. It kind of portable, in that it only takes me about 15 minutes to tear it down or set it up, and I it will find in the back seat of hte car when in pieces.


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twerppoet

twerppoet

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You built a single element quad!

It looks similar because of the way I constructed it, but it's a loop. Ideally the loop would be a circle. I'm loosing a lot of it's performance with the top part being angular, but getting a perfect circle (or even close) is more than I've got the time or supplies for right now.

Loops are substantially smaller than quads. About ⅓ of a wavelength in circumference.

The theory behilnd loops, well, I haven't read up about that yet. I tried one because I've read that they get low noise recpetion at near dipole sensitivity wihout the need for a ground. What you give up is bandwidth. A loop pertty much has to have a tuner attached, or you'd be stuck with a very narrow operating range.
 

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