THUNDERY LOW 1016ĪDRIATIC SEA-IONIAN SEA, MOVING EAST A LITTLE. WEATHER AND SEA BULLETIN FOR WESTERN MEDITERRANEAN SEA RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY Once configured you can expect an output similar to the text pasted below. You can see below the waterfall that I also ticked the Reverse button (Rv). The rest of the parameters are 7bit Ascii, even Parity and 2 Stop Bits. FLDIGI does decode psk31 quite well with no problems, so I assumed that the problem was internal to FLDIGI. I used ARRL Bulletin transmissions to test FLDIGI on those modes. FLDIGI wouldnt decode RTTY and MFSK, and possibly other modes, but it would decode PSK31. In this case, the configuration I used is 50 baud transfer rate and 425Hz Carrier Shift – you can see this setting below the waterfall image where it reads “RTTY 50/425”. Ive been attempting to read this signal at the lower end of 30M. But lately I upgraded my Mac OS to Big Sur and ran into problems. On this occasion I decoded this signal by using a software called fldigi, this programme is very convenient as it makes it relatively straight forward to set a custom configuration to receive RTTY signals. In this case, the distance between the two traces is 425Hz. This trace looks slightly different than the RTTY signals normally found in the amateur radio bands where mark and space (the two bright bands) are 170Hz from each other. Below is a sample of the waterfall signature of one of these signals transmitted by the German Weather Service from Hamburg, Germany. Some initial things to verify are in place: Download and install the USB driver for the radio. The default radio settings on the FT-991A are not likely to work out of the box. ![]() This service consists of a continuous transmission of text containing weather information on various frequencies. Home Documentation Pricing Contact Us Login Sign Up Free worldwide news API. fldigi Wiki FT991Ahowto Log in to Edit Using the FT-991A with fldigi and flrig CAT control involves both software and settings on the radio itself. Some of the RTTY signals are broadcast by the various weather agencies around the world. These are These modes were a result of mechanical and electrical designs of the early TTY machines. The three most common in amateur radio use can be selected from the mode menu. ![]() The selection of symbol rate and bandwidth is made on the RTTY configuration tab. For those who tried without success to decode some of those HF RTTY signals that we all stumble upon while sweeping the HF bands, here is some information that I hope will help you. fldigi can operate on a wide range of RTTY symbol rates and bandwidths.
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