1. For use who don't want to download the PDF:
http://view.samurajdata.se/psview.php?id=3a69542c&page=1

Posted at 11:46PM on Oct 29th 2007 by Aten

2. Hmmm... I *do* have a kick-ass oscilloscope.

Posted at 12:12AM on Oct 30th 2007 by Dennis

3. Is it legal to use this band?

Posted at 1:55AM on Oct 30th 2007 by hypotheel offerte

4. Wonderful hack :)
@hypotheel: given the low power involved, the waves are very unlikely to go out of your property. so yes, it's legal (at least in France), and even if it is not in your country, it will go undetected.

Posted at 7:44AM on Oct 30th 2007 by lekernel

5. Hi your message is good ......But you to have explain it must better.....

Posted at 7:45AM on Oct 30th 2007 by Allba

6. Sounds like the perfect justification for obtaining a kick-ass o-scope!!! :D

Posted at 10:37AM on Oct 30th 2007 by strider_mt2k

7. Let's all welcome our latest spammer, _Lalit_ with his asinine "But Proper Information Should Be Needed" comments in all the latest posts.

Come back when you have something to say, spammy.

Posted at 10:38AM on Oct 30th 2007 by strider_mt2k

8. Now you can detect stuff...sorry can't imagine why you'd want radar outside detecting velocity and range.

I was hoping this was a wide band scanner circuit.

Posted at 11:21AM on Oct 30th 2007 by TJhooker

9. Regarding the legality, FCC Part 15 rules generally permit transmission in licensed bands without a license as long as you are below 100mW.

In terms of building a scanner, you would probably just want to go out and buy one unless you were doing it for the educational value. I can think of multiple ways of doing it, but I would recommend starting with a regenerative or super heterodyne receiver. Once you've built that and got it working, you can play with VCO circuits and feeding say a slow triangle wave into it to make it sweep the tuning.

Posted at 3:04PM on Oct 30th 2007 by Paul Anderson

10. Are you kidding me? you have to have a license to use even 10watts. you need to have an even HIGHER class to use 100watts. I had to take the FCC test, its very restrictive.

Posted at 6:15PM on Oct 30th 2007 by CoffeeBeans

11. coffeebeans...I believe he meant "milliwatts" (mw) not "watts" or "megawats" (MW). And at 100mw, it's well below the Federal radar ;)

Posted at 7:08PM on Oct 30th 2007 by Stephen-C

12. um, he said milliwatts, not watts. of course you're going to need a license for 10 watts, you can transmit for miles with 10 watts given you have a proper antenna.

Posted at 7:08PM on Oct 30th 2007 by andrew

13. This sounds interesting, and I already have a use brewing up in my mind...

Posted at 7:30PM on Oct 30th 2007 by Tom Martin

14. Any idea on what the range should be?
It seems simple enough to build

rpr1@hotmail.com

Posted at 8:19PM on Oct 30th 2007 by Rick

15. UWB is not so much range as data transmission. Range is probably comparable to hobbyist 40KHz sonar sets in range. And the total power is in microwatts, not milliwats. And band power is FAR smaller. Heck, I probably have more RF power in my fillings than this thing does in any particular band.

Posted at 10:05PM on Oct 30th 2007 by soi sentinel

16. @Paul Anderson: I know about the FCC rules. I already have high end equipment that can demodulate signals up to 6.1Ghz though.

It's disappointing though because of all the on chip band hopping in even outlawed equipment. Even high end spectrum analyzers leave out lower ranges and focus on higher, or do the opposite. I know about antenna design interfering, but that's why they modulate the designs.

Posted at 2:42AM on Oct 31st 2007 by TJhooker

17. When they say "radar" do they mean you could use this similarly to a radar a la military aircraft? I'm assuming this thing allows you to detect the range of an object, and then I guess if you mounted the antenna on something spinning with a complex set up you could have a 360 degree radar. Or is this some other kind of radar that does something completely different that I've never heard of?

Posted at 9:53AM on Oct 31st 2007 by TheKhakinator

18. this is great! I love it!

TheKhakinator: yes, this is good old-fashioned "bounce a pulse off of something and see how long it took to come back" radar. It only detects at a single range, though, because of the way the demodulator/correlator circuit works, so you'd need to sweep the delay value. maybe you could attach multiple demodulator/correlators to the same antenna?

Posted at 2:25AM on Nov 1st 2007 by wim

19. @wim: As mentioned by Mr. Staderini's description of the delay line: "The 47 pF capacitor in the delay line could be substituted with a varicap diode whose inverse polarizing voltage might be used to change the radar range.". Alternately, the 1K variable potentiometer could be replaced with one that is digitally adjustable. The step size would probably have to be fine in order to be useful. Just a thought.

Posted at 4:16PM on Nov 2nd 2007 by Mac Cody