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Summary of Contents for DAVIS ECHOMASTER RADAR REFLECTOR
- Page 1 Features, Installation, Design Principles R155E $1.00...
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Page 2: Table Of Contents
Contents Why Use a Radar Reflector? ..... 2 Echomaster™ Radar Reflectors ....3 How a Ship’s Radar Sees Your Boat . -
Page 3: Echomaster™ Radar Reflectors
foghorns, 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. -
Page 4: How A Ship's Radar Sees Your Boat
Peaks in the pattern should approach the laboratory standard and be uniformly distributed 360° around the fixed reference point (your boat). Valleys should be minimal in width. The Davis reflectors show good balance: strong peaks, narrow valleys. Other reflectors have inadequate peaks or large areas of weak response, making them seem smaller on an oncoming ship’s radar screen. - Page 5 Captive corner latches are tough, injection molded plastic to assure minimum angle error. Corner latches allow reflector to be quickly and easily assembled and demounted. Reflector stows flat. Weight without mounting hardware: 1.65 lbs. (.75 kg). #153 mounting harness weighs 1.5 oz. (.4 kg). #152 Standard Echomaster #153 Deluxe Hanging Echomaster Aluminum plates.
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Page 6: Radar Reflector Design
20° or more. 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-... -
Page 7: Reflectivity
Figure 4 Reflectivity. A flat metal plate placed at a right angle to a radar beam will always reflect the maximum amount of energy. Curved surfaces will reflect much less, and the effectiveness deteriorates as the curve becomes more acute. A flat metal surface perpendicular to the radar signal gives a high amount of reflect- ed return. -
Page 8: Radar Frequency
On a curved surface, such as a metal mast, only a very small area will reflect the signal back; the rest is lost at numerous acute angles. Reflections from a corner reflector with circular plates, such as Echomaster, are almost as effective as a plain, flat metal surface. Radar frequency. -
Page 9: Plate Design
Davis Echomaster plates resist flexing and warping, and the corner latching system ensures minimal angular distortion. Conclusion. The use of a professional radar reflector enhances your boating fun, knowing that safety has been part of your cruise preparation. The Davis Echomaster advanced octahedral design utilizes for maximum effectiveness of signal return. -
Page 10: Positioning The Reflector
ECHOMASTER INSTALLATION Positioning the Reflector Cabins, deckhouses, sails, stacks, etc. have a “shadow effect,” blocking a radar sig- nal. To minimize this, the reflector should be fitted as high as possible. Height also helps eliminate the effect of heavy sea and swell conditions which might otherwise blend the observed signal into sea clutter on the radar dis- play. -
Page 11: Assembling The Reflector Plates
Echomaster is designed to mount in the “catch rain” position by being suspended by the halyard / harness system. Alternatively, Echomaster may be permanently affixed to a mast structure. Suspended by Rigid mounting on a mast struc- halyard or harness. ture using pipe fittings. -
Page 12: Mounting Echomaster #152
Slide the remaining half plate in place, as shown (reverse this half plate if the corner latches do not match). Snap in place the three remaining corner latches that secure the half plates. 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. -
Page 13: Mounting Echomaster #153
Mounting Echomaster #153 Step 1. Place the assembled reflector in the “catch rain” position with the three stamped arrows in the “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. -
Page 14: Suspending The Echomaster From A Spreader
Step 4. Clip the cotter rings onto the closed end of the wires. Secure the six cor- ner latches on the reflector with the six 1/4" (6.4 mm) nylon nuts and bolts supplied. Suspending the Echomaster from a Spreader Two small sheaves can be installed about 8" (20 cm) apart on the spreader, as shown here: Then, using a 3/16"... -
Page 15: Using The #157 Surface Mount System
Using the #157 Surface Mount System 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. 1 " U-bolts required for rail fastening. -
Page 16: Echomaster Maintenance
Replacement Parts If any reflector plates should become Echomaster replacement parts may be bent, flatten them as well as possible in obtained from your dealer or Davis order to obtain the high reflective per- Instruments. formance for which the Echomaster Echomaster 152, has been designed.