Reflection is only effective if it reflects back to the radar transmitter. Curved surfaces don't work very well and a flat surface will only work if it is perpendicular to the incoming signal. That's why most radar reflectors are 3 flat surfaces at right angles to each other. They are often called corner cubes or retro-reflectors and are designed to reflect the incoming signal back to the source. That's why stealth aircraft and ships have no right angles.
Gary S/V Kaylarah '90 C&C 37+ East Greenwich, RI, USA ~~~~~~~_/)~~~~~~ On Fri, Feb 2, 2018 at 2:47 PM, Leslie Paal via CnC-List < cnc-list@cnc-list.com> wrote: > the radar antenna is a good sized metal construction. It will reflect. > Also, since it is tuned to the same (about) frequencies, it can passively > re-radiate some of the signal. > > Leslie. > > -------------------------------------------- > On Fri, 2/2/18, Frederick G Street via CnC-List <cnc-list@cnc-list.com> > wrote: > > Subject: Re: Stus-List Question: Radar reflector vs. active radar > To: cnc-list@cnc-list.com > Cc: "Frederick G Street" <f...@postaudio.net> > Date: Friday, February 2, 2018, 10:22 AM > > That’s one > of the more weird things I’ve heard… radars are > specifically designed to try to filter out any signals not > their own. > Other > boats might have something like the CARD system aboard to > pick up other vessels’ radar: > http://nordkyndesign.com/collision-avoidance-at-sea-ais-alarm-project/ > But > those systems haven’t been available new for a decade. > The other type of device that you could have on your > vessel to help other radar-equipped vessels see you better > would be an active radar target augmentation system like the > Echo-Max: > https://www.echomax.co.uk/radar-target-enhancers-x-band-dual-band.html > Or a > Search and Rescue Transponder (SART): > http://www.offshoreblue.com/safety/sart.php > > — Fred > > > Fred Street > -- Minneapolis > S/V Oceanis (1979 C&C > Landfall 38) -- on the hard in Bayfield, > WI :^( > > > On Feb 2, 2018, at > 11:42 AM, Damian Greene via CnC-List <cnc-list@cnc-list.com> > wrote: > Here's a question for your collective > wisdom: > We regularly have fog here in > Maine, and my normal practice is to hoist a Davis emergency > radar reflector in the shrouds (so I hopefully will not get > run over by a lobster boat). So this year I decided to get > the yard to mount an EchoMax reflector on the mast, and be > better prepared. > However, reviewing my > work-list with the yard maintenance manager yesterday, he > asked why I was doing this, as I have radar, and the signal > from my radome would light up on other boats' radar > better than a reflector. > That's something I've > never heard before, so I told him I would investigate and > get back on that. Frankly, this does not make a lot of sense > - why would people bother with radar reflectors - but he has > more than 20 years' experience with Hinckley and > others. > I'd like a definitive answer (Fred?) to resolve > this. > > Thanks, > Damian Greene > ex C&C 34 Ghostnow Sabre 38 FreefallBass Harbor, > Maine > _______________________________________________ > > Thanks everyone for supporting > this list with your contributions. Each and every one is > greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > > > -----Inline Attachment Follows----- > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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