1/3/2023 0 Comments N1mm rtty![]() N1MM Logger, of course, also supports this method of modulating and demodulating RTTY and other digital modes, using a sound-card based digital-mode "engine".Īn RTTY signal is a single carrier (like CW), but instead of being modulated on and off like CW, the transmitted power is kept constant, and modulation is imposed by changing the frequency by a preset amount in amateur usage, the historical practice is to use a "shift" of 170 Hz. ![]() However, with the advent of the ubiquitous sound card-equipped PC, it became possible to perform the modulation and demodulation directly in a personal computer, and the majority of RTTY today is done using a sound card in a PC. TNCs are still in use today, and N1MM Logger supports the use of TNCs for RTTY. The most popular of these units were multi-mode TNCs (Terminal Net Controllers) that supported RTTY in addition to packet radio and other digital modes. ![]() The first of these terminal units were self-contained microprocessor devices (modems) that converted the 5-bit Baudot code used in RTTY into ASCII characters to be sent to a terminal (keyboard and CRT display). More recently, these mechanical teleprinters have been replaced by other devices. Despite these constraints, RTTY has proven to be quite well-adapted to contesting, and it is still by far the most common digital contesting mode. This equipment posed severe constraints on the RTTY mode that are still evident today. If you are an old-timer at RTTY, you can probably skip this section.īefore the spread of personal computers, RTTY was the most prevalent digital mode (other than CW, that is!), and was done using surplus teletype equipment - mechanical teleprinters. ![]() ![]() If you are new to digital mode contesting in general and RTTY in particular, this information may be helpful. This section contains some general information about operating in RTTY that is not directly related to N1MM Logger. N1MM Logger supports digital mode contesting, not only RTTY but also other digital modes, with a flexible interface. Digital mode contesting is growing rapidly. ![]()
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