Youloop / Spytenna

n5rv

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I built one of these a few months back. Was designed by one of the Airspy engineers I understand, works well on my SDRplay RSP1A.

I bought the toroid and wire off amazon. I used 22g wire, but I'd advise something a bit smaller. It took me a few tries to get it wound without nicking the insulation.


81569
 

n5rv

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I used RG8 for the main loop, and RG58 for the feedline. The feedline was a piece I salvaged from an antenna replacement on a game wardens truck, it has an FME connector on the end so I can change the ends to whatever I may need, SMA, BNC, etc.
 

ka3jjz

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I believe I've seen this exact schematic on another list. It seems like it would be well worth trying not only for portable use, but if you are close to an urban area with lots of MW, FM or TV stations. The lack of an amplifier which might cause issues using it on broadbanded SDRs might actually be a plus in this case. Remember that with loops, you're not looking to get the strongest signal, you're looking to have better signal quality (less noise and other interference). Good find....Mike
 

mbott

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I mentioned why I wanted to put one together in my original post. I'll probably experiment with what I have on hand before I order the BN-73-302. It appears to have promise. I'm also watching the availability (and pricing) of the Youloop. I should have some additional info coming from Thomas Witherspoon on his. Coastal DXing with the AirSpy HF+ Discovery and a homebrew passive loop antenna
 

mbott

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The pics are from Thomas Witherspoon. He said a description of his loop construction will follow shortly in his blog.
 

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ka3jjz

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I tried to google YouLoop but didn't come up with it. Do you have a link, Mike? the other Mike
 

mbott

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Mike,
As far as I know, there are no links yet. I'd keep an eye on the Airspy.us website as the most likely place that it will show up first.

--
Mike2 :)
 

wa8pyr

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The pics are from Thomas Witherspoon. He said a description of his loop construction will follow shortly in his blog.
Thomas put on a very interesting and informative presentation about SDR ("A New Era In Portable SDR DXing") in the field at the SWL Winterfest 10 days ago. Some of those pics appeared in the presentation, and he may post the presentation or other parts of it on his blog soon.

In a nutshell, he goes out in the field to monitor and DX chase, but quite often sets the SDR to record a slice of spectrum for a couple of hours while he goes out with his family. He can then surf through the recording in real time at his leisure in the comfort of his home.

That passive loop is one of the antennas he uses when he's out gallivanting about.

Jef Eichner returned with the latest episode in his loop antenna series also, although his series leans more toward small transmitting loops.
 
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mbott

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Youssef commented that he expects the the released version of the Youloop to be right around $40. Oh, 8 of the BN-73-302 binocular cores arrived in the post the other day. A trip to Universal is now in order to pick up some appropriate coax for a homebrew attempt ... or two.

--
Mike
 

p1879

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The Youloop is in at Airspy and on their website for sale. Mine is coming soon!
p1879
 
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