9/22/2023 0 Comments Mrp40 cw morse decoder![]() ![]() Whether you do FSK RTTY or AFSK RTTY, the software has to be configured to look at the virtual microphone set up by the Icom's sound card so it can see the audio stream coming from the radio. You can take that approach with RTTY, but you'd then be sending AFSK RTTY with the radio in USB-D mode. With WSJT-X, the software is telling the radio to key and then sending audio to the radio which the radio uses to modulate the carrier in USB mode. The special sauce is the VSPE software that sets up another virtual COM port and EXTFSK (or EXTFSK64) which interprets the shift commands from MMTTY into toggles of the RTS line in the virtual COM port. But, with the 7300, you have to jump through a few hoops since everything has to be done over the single COM port that the USB connection created. The basic concept is that software, such as MMTTY, tells the radio to key (PTT, SEND, etc.) and then tells the radio to do the FSK shift. For transmitting CW, the program encodes keystrokes from the computer’s keyboard. The decoded text is displayed on the computer’s monitor. The radio will have to be in RTTY mode to send FSK RTTY. MRP40 is a powerful and highly-effective ham radio software program that decodes received CW audio that has been fed to a computer’s sound card. ![]() Here are some suggestions for doing FSK RTTY with the IC-7300: Icom IC-7300 USB for Radio Control + FSK Keying But, for sending CW or sending RTTY using FSK, you need another program like MRP40 for CW or MMTTY for RTTY. įLDigi can be used to decode CW and to decode RTTY and to send RTTY using AFSK. As I said, it wants to key the radio and then send an audio signal which modulates the carrier. The problem here is that I don't think FLDigi understands how to do this on and off keying in order to modulate the carrier. RTTY using FSK (frequency shift keying) is similar except that in addition to the "send" command, there will also be some sort of "shift" command that causes the radio to change the carrier frequency by the amount of frequency shift you are using, usually 170 Hz for amateur radio RTTY. When your radio transmits CW, it turns the transmitter on and off so that the carrier goes on and off. However, when you put most radios into CW mode, the radio is looking for on-off keying using a "send" or "PTT" command with no audio signal. I suppose this would also work for CW transmitted as MCW (modulated continuous wave). It can also work with RTTY using AFSK (audio frequency shift keying). MRP40 works best when 'fed' with signal and noise Please try to ensure you meet the above suggestions and Im sure that MRP40 will decode with excellent accuracy. When testing the MRP40 program dont hesitate to 'feed' the program with weak noisy morse signals. This works well for "sound card digital modes" like PSK31 or Olivia. The built-in CW Filter is extremely selective, typical Bandwidth is 30Hz. FLDigi is designed to key your radio's transmitter and send an audio signal which your radio then transmits over the air. ![]()
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