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Features, Installation, Design Principles

R155E

$1.00

Echomaster User’s Manual

00155.010, Rev. G

January 2009

Total pages 16

Trim to 5.5 x 8.5"

Black ink only

Page 1 (front cover)

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Summary of Contents for ECHOMASTER 152

Page 1: ...Features Installation Design Principles R155E 1 00 Echomaster User s Manual 00155 010 Rev G January 2009 Total pages 16 Trim to 5 5 x 8 5 Black ink only Page 1 front cover ...

Page 2: ...f sea clutter do not possess enough reflective qualities to make the boat highly visible to radar And container vessels and tankers require long stopping time and wide turning radius Ensuring the detectability and recognition of your craft at a long distance from an overtaking vessel under all weather and sea conditions is critical to avoid disaster Without a radar reflector or radar of your own y...

Page 3: ...horns propellers or the mighty bowwave from an onrushing skyscraper of steel Even if you did spot them or detect them on your radar which way would you turn Best to let them see you instead Furtherrnore in distress situations the Coast Guard can be materially aided in search and rescue by the deployment of a good radar reflector The U S Coast Guard is considering marine radar reflector requirement...

Page 4: ...ERGENCY RADAR REFLECTOR 151 MOBRI RADAR REFLECTOR FIRDELL BLIPPER RADAR FLAG Admiralty surface weapons test England 4 How a Ship s Radar Sees Your Boat The radar of a ship making a complete circle around a boat would hit the boat s radar reflector from all angles If the boat were stationary and we plotted how strong the reflected signal is at all angles we would arrive at performance diagrams such...

Page 5: ...le and hang from holes drilled in corner latches 157 Surface Mount System can be purchased separately 153 Deluxe Hanging Echomaster Anodized aluminum plates Comes with hanging mount system to suspend unit from mast or rigging in perfect catch rain position Vinyl storage case included 157 Surface Mount System can be purchased separately Captive corner latches are tough injection molded plastic to a...

Page 6: ...es that vary from the axis of symmetry by 20 or more Figure 1 Figure 2 The Echomaster radar reflector an octahedral cluster of eight pockets uses the principle of the axis of symmetry to full advantage Fig 3 In the catch rain posi tion it allows three of the pockets of the reflector to be depressed 20 and three of the pockets to be elevated 20 With the radar reflector oriented in this man ner the ...

Page 7: ... Curved surfaces will reflect much less and the effectiveness deteriorates as the curve becomes more acute A slanted surface will reflect much less due to reflection of most of the signal in a direction other than the radar signal source A flat metal surface perpendicular to the radar signal gives a high amount of reflect ed return ...

Page 8: ...eflective surfaces the effective radar cross section referred to as σm This value σm is useful in stating a figure of merit for the per formance of radar reflectors A reflector s performance the amount of signal that it will reflect is stated in terms of the diameter of a metal sphere which would produce an equivalent radar response Fig 5 8 Figure 5 On a curved surface such as a metal mast only a ...

Page 9: ...r reflector dimensions For practical purposes however doubling the size of the radar reflector will not usu ally double the detection Alignment of reflector plates An essential design feature of any reflector one which greatly enhances the effective amount of signal returned is the flatness of the plates and the accuracy of the right angles formed between them Alignment of each angle must be withi...

Page 10: ...zon Values in the table are approximate reliable detection ranges for common radar reflectors seldom equal the radar horizon distances indicated above If you have a radar installation on your boat it may be necessary to keep the Echomaster reflector a minimum distance away from the radar antenna You should consult with your radar dealer or manufacturer to avoid possible damage to equipment or adve...

Page 11: ...to a mast structure Suspended by halyard or harness The orientation shown is the perfect catch rain position Rigid mounting on a mast struc ture using pipe fittings The 157 Surface Mount System could also be used which would allow the catch rain position Slide full circular plates 1 and 2 together as shown Notice that the stamped arrows are to be locat ed side by side in the same corner Snap in pl...

Page 12: ...g support lines to a downhaul halyard Suspend the reflector vertical ly as high as possible Mounting Echomaster 152 The standard Echomaster 152 does not include a mounting system The best way to install this product is to assemble it around a backstay or make your own bridle and hang from holes drilled in the corner latches 6 Point Temporary Mounting For infrequent temporary mounting a rope harnes...

Page 13: ...up position Assemble one flat washer and one mounting block onto a harness wire as shown below Push the wire up through the center hole of the radar reflector Step 2 Assemble the other mounting block and washer onto the closed end of the wire protruding through the top of the reflector Step 3 Link the two wires together as shown ...

Page 14: ...hin 10 25 cm of the spreader Many other solutions are equally satisfactory however to minimize wear and chafing on the suspension lines we recommend the system shown here Although rotation and bouncing in the wind do not degrade Echomaster s perfor mance free spinning in one direction and then the other can fray the support lines leading to possible breakage To limit spinning secure a tie line to ...

Page 15: ...em The Davis 157 allows permanent installation of an Echomaster reflector on a hard surface or a railing up to 1 25 32 mm in diameter Fasteners are not included 11 2 U bolts required for rail fastening Note The 157 system cannot be used on the discontinued Echomaster model 153 4 Slide on assembled reflector 5 Install second corner block ...

Page 16: ...re that no condition is developing which could lead to mounting failure and possible injury Davis Instruments wishes you many years of happy and safe boating with your advanced design Echomaster Radar Reflector 3465 Diablo Ave Hayward CA 94545 U S A Phone 510 732 9229 Fax 510 732 9188 info davisnet com www davisnet com 00155 010 Rev G January 2009 Copyright 2009 Davis Instruments Corporation Also ...

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