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
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