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Fixed location of police boat and fixed descriptions

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Mark Allyn
2026-06-16 08:14:12 -07:00
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02_text_description.md
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1. Chain Home radar
The UK developed the chain home radar in the 1940's. This was one of the earliest radar,
developed in response of threats of air attacks from the Germans.
developed in response to threats of air attacks from the Germans.
The scope is similar to that of an oscilloscope. One the horizontal axis of the scope is
the range. The vertical axis is the amplitude of the returned echo from aircraft.
The bearing of the incoming echo signal is detrmined by feeding the signals from two
The bearing of the incoming echo signal is determined by feeding the signals from two
identical dipole antennas, mounted at right angles to each other into a radiogoniometer.
The operator menually turns a search coil until the signal strengh on the oscilloscope
reaches a null poing (minimum signal). The direction (bearing) is read from a calibrated
The operator manually turns a search coil until the signal strength on the oscilloscope
reaches a null point (minimum signal). The direction (bearing) is read from a calibrated
dial.
In our exhibit, the chain home radar is located in Ventnor, on Isle of Wight.
2. Marine a-scope
The UK, after developing microwave radar, which with it's shorter wavelengths,
became able to pick up echos from small targets such as the parascope and the
connong tower from enemy submarines.
became able to pick up echos from small targets such as the periscope and the
conning tower from enemy submarines.
The system consists of a steerable microwave dish connected to an oscilloscope
display. The horizontal axis is the range; the vertical axis is the strength
of the return; and the bearing (direction) is determined by manually rotating
the microwave antenna using a servo control at the console that drive servo motor
attached to the microwave dish antenns.
the microwave antenna using a servo control at the console that drives the servo motor
attached to the microwave dish antenna.
These radars were used on the Brittish Corvetts boats that were used in anti
submarine warefare.
These radars were used on the British Corvettes that were used in anti
submarine warfare.
In our exhibit, this radar is on a boat moored at the dock of the Community
Boating Center in Bellingham Bay.
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The marine traffic control radar is a plan position indicator (PPI) type radar,
where the display consists of a circular sweep beam. The range is determined by
how far the blip is from the center of the scope. The bearing is determined by
the direction of the beam in its rotation. The beam rotates clockwise staring
the direction of the beam in its rotation. The beam rotates clockwise starting
from north. The strength of the echo is determined by the brightness of the
blip on the scope.
All modern radars use this type of display.
In our exhibit, this radar is located in the center of Bellingham Bay.
4. Police Boat Radar
The police boat radar is a plan position indicator (PPI) type radar, where
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how far the blip is from the center of the scope. The bearing is determined by
the direction of the beam in its rotation. The beam rotates clockwise starting
from the heading of the boat. A small line indicated which direction is north.
the strength of the echo is determined by the brightness of the bliip on
the strength of the echo is determined by the brightness of the blip on
the scope.
In our exhibit, the police boat on which this radar is mounted will be tied up
to the floating pier located at the end of the boardwalk foot and bicycle trail
that is part of Boulevard Park. It is also at the foot of Taylor Street. We call
this the Taylor Dock. The Police boat will cruise around Bellingham Bay, showing
a radar on a moving boat.