Path: utzoo!attcan!lsuc!ncrcan!brambo!wwg
From: wwg@brambo.UUCP (Warren W. Gay)
Newsgroups: sci.electronics
Subject: Re: Radar detection
Keywords: radar, gravity
Message-ID: <436@brambo.UUCP>
Date: 23 Jan 89 16:16:02 GMT
References: <311@serene.UUCP> <2813@hplabsz.HPL.HP.COM>
Reply-To: wwg@brambo.UUCP (Warren W. Gay)
Organization: Bramalea Software Inc., Bramalea, Ont.
Lines: 28

>In article <311@serene.UUCP> gbell@pnet12.cts.com (Greg Bell) writes:
>>   Has anyone ever heard of building a simple radar detector using just one
>>op-amp?   Radio Electronics had an interesting circuit a while ago that was
>>basically an op-amp with a capacitor connected across the inverting and
>>non-inverting inputs of the amp.   Aparently, this arrangement allows
>>detection of various RF energies...
>
>Wasn't that for detecting "scalar gravity waves"?  They used that to
>detect black holes and supernovae, etc....
>Darren Leigh
>Internet:  dleigh@hplabs.hp.com
>UUCP:      hplabs!dleigh

The gravity wave detector was a more recent (I think).  I recall the
radar detector worked simply because the capacitor was required for
coupling or DC blocking or something, but the leads were carefully
cut to a particular length to match the frequence of the radar involved.
The capacitor leads was thus the "antenna" for the microwaves.

The gravity detector I built on a bench one night.  Its rather interesting
to watch, but I had no chart recorder and didn't feel like spending time
on a data capture interface & software for the VIC 20.  I used LM3900
op amps, of which I have a whole box of, instead of the suggested circuits.

73s de VE3WWG (Warren)..............LSI represents Large Scale Investment,
.................transistors are "discrete", but tubes are just plain fun.
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