From 72e99e79ba4dbdd777b57860a7bd7e0bd4986869 Mon Sep 17 00:00:00 2001 From: Mark Allyn Date: Tue, 16 Jun 2026 07:57:08 -0700 Subject: [PATCH] Add descriptions --- 02_text_description.md | 58 +++++++++++++++++++ ...tion.md => 03_setup_and_radar_selection.md | 0 2 files changed, 58 insertions(+) create mode 100644 02_text_description.md rename 02_setup_and_radar_selection.md => 03_setup_and_radar_selection.md (100%) diff --git a/02_text_description.md b/02_text_description.md new file mode 100644 index 0000000..7c9ea51 --- /dev/null +++ b/02_text_description.md @@ -0,0 +1,58 @@ +Radar Text Descriptions for the Left Hand Text Field (Or on separate monitor) + +The following four radar descriptions shall be applied to the left hand text description +field: + +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. + + 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 + 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 + 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. + + 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. + + These radars were used on the Brittish Corvetts boats that were used in anti + submarine warefare. + + In our exhibit, this radar is on a boat moored at the dock of the Community + Boating Center in Bellingham Bay. + + 3. Marine Traffic Control Radar + + 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 + 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. + + 4. Police Boat Radar + + The police boat 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 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 scope. + diff --git a/02_setup_and_radar_selection.md b/03_setup_and_radar_selection.md similarity index 100% rename from 02_setup_and_radar_selection.md rename to 03_setup_and_radar_selection.md