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Today I demonstrate how to connect your radio to an Echolink and IRLP node via your local repeater. I am using a Baofeng UV-5R5 handheld with DTMF tone calling. Hope you enjoy!

Page ContentsIRLP – What is it?Hardware requirementsOperating SystemRF HardwareHow does it work?Where are the nodes?Using IRLP with a radioGetting More HelpRelated posts:IRLP – What is it? IRLP (Internet Radio Linking Project) was created in 1997 by Dave Cameron ... Read More

Is it possible to connect a pi-star to an Echolink or IRLP node? Maybe a link to a guide on how to configure if it is possible?

Page ContentsIntroductionUsing Echolink on a computerUsing Echolink via a radioEchoLink DTMF FunctionsConnectLink Up and Link DownProfile SelectStation ShortcutsEntering Node NumbersEntering CallsignsExamplesEchoLink responds with:EchoLink responds with:Getting HelpRelated posts:Introduction Echolink is a VOIP (Voice Over IP) application ... Read More

A tiny sensor that exploits the same physics as the whispering gallery in St. Paul's Cathedral in London will help make nanotechnology safer.

Controlling the lasing mode, emission direction, threshold, and quality factor of whispering-gallery mode lasing is important for practical applications such as optical interconnections, on-chip communications, trace detection, high-density storage, etc. In order to simultaneously control the mode a …

Whispering-gallery-mode (WGM) microresonators are opening up many new research directions that enable the detection of proteins, enzymes and DNA, down to single molecules. A new class of sensors makes ...

Whispering gallery modes are specific resonances (or modes) of a wave field that are confined inside a given resonator (cavity) with smooth edges due to continuous total internal reflection. The most interesting from a practical viewpoint are electromagnetic whispering gallery modes, since they posses many unique properties, such as ultra-high Q-factors, low mode volumes, small sizes of resonators supporting them and operation at optical and telecommunication frequencies of light. This combined with the ease of fabrication and on-chip integration of devices using them, makes whispering gallery modes ideally suited for a vast array of applications. In this seminar we will look at some key issues concerning whispering gallery modes and resonators such as: wave theory of whispering gallery modes, resonator performance parameters, resonator geometries, coupling of whispering gallery modes to and from resonators and at some practical applications of whispering gallery modes.

Light: Science & Applications - Review of biosensing with whispering-gallery mode...

Trapping light with an optical version of a whispering gallery, researchers at the National Institute of Standards and Technology (NIST) have developed a nan

Near-infrared (NIR) solid-state micro/nanolasers are important building blocks for true integration of optoelectronic circuitry. Although significant progress has been made in III-V nanowire lasers with achieving NIR lasing at room temperature, challenges remain including low quantum efficiencies an …

Optical microcavities can be designed to take advantage of total internal reflection, which results in resonators supporting whispering-gallery modes (WGMs) with a high-quality factor (Q factor). One of the crucial problems of these devices for practical applications such as designing microcavity lasers, however, is that their emission is nondirectional due to their radial symmetry, in addition to their inefficient power output coupling. Here we report the design of elliptical resonators with a wavelength-size notch at the boundary, which support in-plane highly unidirectional laser emission from WGMs. The notch acts as a small scatterer such that the Q factor of the WGMs is still very high. Using midinfrared ( λ  ∼ 10 μm) injection quantum cascade lasers as a model system, an in-plane beam divergence as small as 6 deg with a peak optical power of ∼5 mW at room temperature has been demonstrated. The beam divergence is insensitive to the pumping current and to the notch geometry, demonstrating the robustness of this resonator design. The latter is scalable to the visible and the near infrared, thus opening the door to very low-threshold, highly unidirectional microcavity diode lasers.

Optical whispering-gallery mode (WGM) microresonators, confining resonant photons in a microscale volume for long periods of time, strongly enhance li…

Research team led by the University of Göttingen succeeds in coupling free electrons to optical resonators. When you speak softly in one of the galleries of St Paul’s cathedral, the sound runs so easily around the dome that visitors anywhere on its circumference can hear it. This striking phenome

We present a comprehensive overview of sensor technology exploiting optical whispering gallery mode (WGM) resonances. After a short introduction we begin by detailing the fundamental principles and theory of WGMs in optical microcavities and the transduction mechanisms frequently employed for sensing purposes. Key recent theoretical contributions to the modeling and analysis of WGM systems are highlighted. Subsequently we review the state of the art of WGM sensors by outlining efforts made to date to improve current detection limits. Proposals in this vein are numerous and range, for example, from plasmonic enhancements and active cavities to hybrid optomechanical sensors, which are already working in the shot noise limited regime. In parallel to furthering WGM sensitivity, efforts to improve the time resolution are beginning to emerge. We therefore summarize the techniques being pursued in this vein. Ultimately WGM sensors aim for real-world applications, such as measurements of force and temperature, or alternatively gas and biosensing. Each such application is thus reviewed in turn, and important achievements are discussed. Finally, we adopt a more forward-looking perspective and discuss the outlook of WGM sensors within both a physical and biological context and consider how they may yet push the detection envelope further.

The secrets behind the magic of this beloved phenomenon.

Whispering gallery - are you familiar with this interesting phenomenon? Come closer, we have an amazing history and science lesson to share!