Sounder


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Sounder

 

the simplest telegraph apparatus for the audible reception of Morse code. It is an electromagnet with two coils and an armature, which is restrained by a coil spring. The range of deflection of the armature lever is limited by screws. The telegraph operator hears the knocking of the lever against the screws. To amplify the sound, the sounder is placed in an acoustic resonator. Sounders were used with Morse apparatus in the late 1920’s and early 1930’s; however, they did not become widespread, since they do not provide a record of the signals.

References in periodicals archive ?
Every PA 1 PATROL Series Sounder includes a standard 10-year warranty.
Voice sounders are used as part of a voice evacuation system in large public and commercial buildings to quickly alert occupiers to an emergency and instruct them to evacuate the premises.
In the late 1990s, direct assimilation of satellite sounder radiances (not the derived profiles) in global NWP models provided the impetus to achieve forecast improvement in the radiosonde-rich Northern Hemisphere, bringing positive impact in both hemispheres (the radiosonde-poor Southern Hemisphere had benefitted immediately from the satellite soundings; Kelly et al.
Its wide operational temperature range means the sounder can function in automobile cabin temperatures from -40 to 105 degrees Celsius.
The channel sounder uniquely captures channel measurements where all the data is acquired and processed in real-time.
As well as 90dB wall or ceiling mounted sounders for internal use, the system can also be supplied with more powerful 110dB waterproof sounders for external use.
The CrIS is an advanced sounder that provides detailed atmospheric temperature and moisture observations for weather and climate applications.
It is also available as part of the DL112X, in which the horn sounder is integrated with a 5 Joule Xenon strobe, or as the DL112H combination unit, where the horn sounder is combined with a high output 24-unit LED array beacon.
When cabled with a common power supply, the sounder features an alarm accept function.
In this paper, we provide a compact description of a UWB channel sounder, which can operate in real-time.
At the core of the package is Hybrid Dual Imaging (HDI), a combination of Broadband Sounder technology and Downscan Imaging.
Unique System FZE, a Unique Maritime Group Company and one of the world's leading integrated turnkey subsea and offshore solution providers, in association with Bayanat Mapping & Survey Services, a leading provider of geospatial products and services, has launched EM 2040 Multibeam Echo Sounder on Bayanat's survey catamaran, at Reem Island in Abu Dhabi, UAE.