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Questions tagged [rtty]

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Any hints on working RTTY split?

I tried to work TX5S yesterday on RTTY yesterday. They were running split, which I haven't done before on RTTY. I use fldigi along with an IC-7300. I tried two methods. First, using the "lock&...
gschro's user avatar
  • 157
5 votes
2 answers
561 views

How is a crossed-ellipse display generated from FSK?

What is the algorithm or circuit needed to generate a (vintage?, retro?) crossed-ellipse display from RTTY and/or 2FSK signals? (as per the (obsolete?) questions in some FCC exam pool) (assume ...
hotpaw2's user avatar
  • 13.4k
3 votes
3 answers
2k views

Open Source Library for Digital Mode

I want to play a bit more with programming side of digital modes. However, a quick Google search turned up lots of software and some general explanations but no open-source library implementing such a ...
Edgar H's user avatar
  • 185
5 votes
1 answer
132 views

BFSK with huge spacing, why?

I recently bought one of the classic USB dongles to experiment with SDR. At 460MHz (Europe, CH) I constantly see many digital transmission that use BFSK. What is strange to me is that: the frequency ...
MarcoM's user avatar
  • 53
2 votes
1 answer
609 views

How are symbols encoded in RTTY?

I am looking for RTTY AFSK specifications. I am a little confused when coding the Baudot code; not the normal characters, but the symbols and numbers.
Duarte Ferreira Dias's user avatar
3 votes
1 answer
260 views

What is the proper spacing away from a rare RTTY station?

How far away should I transmit from a rare DX station in RTTY? RTTY itself doesn't take that much bandwidth, but I've heard that I should be spaced 2-3 kHz away. Is that true? Thanks!
PearsonArtPhoto's user avatar