Mackay Radio Director Finder Red Oak Victory DSC_0376 (2)

            This is the user interface for the radio direction finder. A loop ("O") antenna on top of a mast rises from the top of the deckhouse. The wheel on the bottom of the control box turns a reduction gear that moves the loop relative to the ship, as indicated on the 2 handed (clock-style) pointer. 

At a guess, one revolution of the wheel makes one revolution of the big hand on the indicator, and moves the loop antenna 10 degrees. That would give 36 points for the little hand to point to, 10, 20, 30, 40, etc degrees. 

The loop measures relative angle between a radio source and the ship, so there is an outline of a ship on the display. If big hand and little hand both point straight up, that's 0 or 360 degrees, relative. The ship's magnetic compass can be read for what absolute magnetic course the ship is steering. The offset indicated by the direction finder can be added / subtracted from that bearing to produce a magnetic course for the ship to steer. This is the usual way ships are steered. 

If the source of the radio beacon is fixed and close by, simply steering toward it will be sufficient. If the beacon is moving or a long distance away, steering toward it may not be the most efficient course - if its moving, a curve of pursuit can be followed but its more efficient to pick a point to intercept and head for it directly. If the beacon is very distant, a "great circle" course will be the shortest route, although the course will not be a simple constant.

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Taken on: November 14, 2021

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Sets appears in: • Dad and Ian • electronics more » • Museum Visits • Naval vessels • Things to see, places to go, San Francisco Bay Area • USS Red Oak Victory AK-235 « less

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Camera: Nikon D3200, f/3.5, 1/50 sec, 17mm (=25mm), ISO 400 (more info) (hide info)

Camera:	Nikon D3200
Lens:	Tamron SP AF 17-50mm f/2.8 XR Di II VC LD Aspherical (IF) (B005)
Aperture:	f/3.5
Exposure Time:	0.02 sec (1/50)
Focal Length:	17mm (35mm equivalent: 25mm)
ISO:	400
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Not Defined
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Gain Control:	Low gain up
Color Space:	sRGB
Software:	Photos 1.0.1
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