The Telegraph Time Machine

Description: The extensive network of telegraph wires that once enveloped the nation has disappeared, much like a spider's web is swept away by a broom. Please note that the information below is outdated. Dial-up Morse is no longer commonly used. This page serves historical purposes only. For the latest developments in landline Morse technology, refer to Morse KOB. Although the old open wire lines have been removed, American Morse is still utilized as a communication method. This report discusses "dial-up" telegraphy, the last remnant of landline Morse telegraphy in the United States. The Morse Telegraph Club comprises enthusiasts interested in all topics related to Morse code and telegraphy. A significant portion of the club consists of retired landline Morse operators. Each year, various chapters across the country gather on Professor Morse's birthday to reminisce about the era of landline telegraphy and the peak of the railroads. During these gatherings, keys and sounders are reactivated, and telegraph circuits are established with other chapters nationwide. Morse code is soon heard clicking from sounders, and greetings are exchanged among friends in different chapters. This is achieved through a unique combination of modern technology and equipment that is over 150 years old, referred to as "dial-up" telegraphy. This article explains the workings of dial-up telegraphy and how interested Morse enthusiasts can participate. Dial-up telegraphy employs technology salvaged from the influx of affordable personal computer equipment that became available in the 1980s. The "modem," essentially a transceiver designed to transmit digitally encoded data over voice phone lines, can be easily adapted to transmit the dits and dahs of Morse code. Most modems utilizing the Bell 103 standard are suitable for this purpose. Given that the 300 baud Bell 103 standard is obsolete by current standards, these modems are often found at flea markets and hamfests, typically available for a few dollars. A popular choice is the Radio Shack DCM series, known for its ease of use. The Bell 103 standard is a full-duplex system, allowing each modem to transmit two different tones: one tone indicates a mark while the other represents a space. The modem operates in two modes: answer and originate. The "answer" or "originate" mode designates which tone corresponds to a mark (key closed) and which tone corresponds to a space (key open). When two modems are connected, one operates in answer mode while the other is in originate mode. Dial-up Morse closely resembles the methods used to provide Morse service during its final years of commercial operation. The Bell 103 signaling standard enabled the use of equivalent DC loop circuits, as true direct current signaling had been phased out. The primary difference today is that a phone must be used to dial the number of the other office, rather than having a permanently connected dedicated line. A simple circuit is necessary to interface between the modem and the telegraph key and sounder. The "Trump" circuit, named after MTC member Ed Trump, is the most popular configuration. Although printed circuit boards were once available to simplify the construction of this circuit, it can be built on perfboard by those experienced in this type of circuit assembly. Two telegraphers would utilize the dial-up equipment in the following manner: the telegrapher originating the call switches his modem to originate mode, while the telegrapher receiving the call switches his modem to answer mode. The originating telegrapher dials the number of the answering telegrapher. Once the phone begins to ring, he activates his modem and hangs up the handset. When the answering telegrapher picks up his handset, he will hear the tones transmitted by the originating modem.

Dial-up telegraphy operates on the principles of analog signal transmission, where the modem encodes Morse code into audio tones that can be transmitted over standard telephone lines. The system's efficiency is rooted in its ability to leverage existing telecommunication infrastructure while preserving the historical significance of Morse code. The Trump circuit typically includes a few essential components: a telegraph key, a sounder, and the modem itself. The telegraph key serves as the input device for the operator to generate Morse code, while the sounder acts as the output device, converting the received tones back into audible Morse signals. The circuit design must ensure proper impedance matching and signal integrity to facilitate reliable communication between the telegraphers.

In practice, the telegraph key is connected to the modem's input, allowing the operator to control the transmission of Morse code. The modem's output is connected to the sounder, which produces audible clicks corresponding to the received Morse signals. Proper grounding and shielding are critical in the circuit design to minimize interference and ensure clear signal transmission. With the resurgence of interest in historical telegraphy, dial-up telegraphy serves as a bridge between the past and present, allowing enthusiasts to engage with a rich heritage of communication technology while utilizing modern tools.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 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 adapted to transmit the dits and dahs of Morse code.

Most modems using the Bell 103 standard can be used. Since the 300 baud Bell 103 standard is obsolete by todays standards, these modems can be found at fleamarkets and hamfests and can usually be had for a few dollars. A favorite is the Radio Shack DCM series which is very easy to work with. The Bell 103 standard is a full-duplex system. Each modem can transmit 2 different tones; one tone represents a mark while another tone represents a space.

The modem can operate in two modes; answer and originate. The "answer" or "originate" simply indicates which tone is used for mark (key closed), and which tone is used for space (key open). When 2 modems are linked, one is in answer mode and the other is in originate mode. Dial-up Morse differs very little from an actual method used to provide Morse service during its last years of commercial service.

The Bell 103 signalling standard allowed equivalent DC loop circuits to be used where true direct current signalling had been eliminated. Today the only significant difference is the fact that you must must use a phone to dial the number of the other office as opposed to having a permanently connected and dedicated line.

A simple circuit is required to provide the interface between the modem and the telegraph key and sounder. By far the most popular circuit is the "Trump" circuit, named after MTC member Ed Trump. At one time printed circuit boards were available to simplify construction of this circuit. However, the circuit is relatively simple and can be built on perfboard if you have experience with this type of circuit construction.

See the appendix for more information. Two telegraphers would use the dial-up equipment as follows. By standard convention, the telegrapher originating the call will switch his modem to originate mode. The telegrapher receiving the call will switch his modem to answer mode. The originating telegraph op dials the number of the answering op. As soon as the phone begins to ring, he turns on his modem and hangs up his handset. When the answering op picks up his handset, he will hear the to