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Assignee: Marconi Instruments Limited (GB2)


Location: Not specified.
No. of patents: 5

NumberTitleIssue Date
4838070Method and apparatus for dry testing water-immersible acoustic transducers
A method of testing piezo-electric transducers includes locating one end (11) of a rod (10) of solid material over the active head (20) of the transducer, the rod (10) simulating the normal acoustic impedance presented to the transducer by the normal medi...
06/13/1989
4810960Measuring adjacent channel power
A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power measured after filtering by a low pass filter. To eliminat...
03/07/1989
4582491Training apparatus
An apparatus for training a user in contamination surveillance. The contamination may be from a nuclear, bacteriological or chemical explosion or leak, for example. The apparatus is portable and can be carried by the user to various points of an exercise ...
04/15/1986
4112340Control devices
A manually rotatable control knob is coupled to a d.c. ironless motor which maintains rotation of the knob once it is initially spun by hand. The initial back e.m.f. of the motor is sensed and is used via a feedback loop having a particular time constant ...
09/05/1978
4107585Control devices
A control device which is suitable for use with electronic apparatus is used to scan a range of signal or data values, such as a frequency spectrum, and to cease scanning when a selected parameter is found. The scanning operation is driven by a d.c. ironl...
08/15/1978
 
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