The great network of telegraph wires that once enfolded the nation like a cobweb has vanished just as surely as the spider`s handiwork is erased by a sudden sweep of the broom. ` Please note that the information below is obsolete. Dial-up Morse is no longer in common use. This page is here for historical purposes only. Please refer to the web site
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Morse KOB for the latest on current landline Morse technology. The great telegraph wire broom may have gotten all of the old open wire lines, but American Morse is still being used as a means of communication. This is a report on "dial-up" telegraphy, the last remaining vestige of landline Morse telegraphy in the US. The Morse Telegraph Club is a group of enthusiasts interested in any topic concerned with Morse code and telegraphy. Probably the biggest constituency in the club is retired landline Morse operators. Each year, the various chapters around the country meet on Professor Morse`s birthday to remember the good old days of landline telegraphy and the heyday of the railroads. In addition, keys and sounders are dusted off and telegraph circuits are established with other chapters around the country. Morse code is soon heard clicking from sounders and greetings are received from friends in other chapters. How is this accomplished The MTC members use an interesting combina tion of modern and 150 year old technology which is called "dial-up" telegraphy. This article describes how dial-up telegraphy works, and how the interested Morse enthusiast may participate. Dial-up telegraphy uses technology salvaged from the wave of inexpensive personal computer equipment that became available in the 1980s. The "modem" which is essentially a transceiver designed to transmit digitally encoded data over voice phone lines is easily...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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