Rtty software freeware

No additional hardware is required. You only need a transceiver and computer Pentium or better with a sound card. A simple circuit for PTT-control can be used. It is fast and convenient to use with many macros for transmitting. Can integrate with AALog logger. The working area of the program is divided into several windows, the sizes of which can be changed by the user by dragging the borders.

In the top window the current spectrum of a signal blue line and a peak detector of spectral components green line are shown. The vertical red lines in this window show the working frequencies of the RX filters.

In most modes you see two vertical line; in PSK modes - only one. To change the center frequency, click on the desired frequency probably between the peaks. In MultiFSK mode mouse click defines lowest radio frequency, not center one. The short thick black lines show TX frequencies.

To change the TX frequency, click on the desired frequency by right mouse button or the left mouse button with "Ctrl" key pressed. Ruler under top window shows frequencies of sound spectrum. RX and TX frequencies and shifts are also shown in the status line.

You can use keyboard and screen buttons located below spectrogram ruler for fine tuning. These screen buttons can be used for TX frequency changing also. TX sound frequency is changed if right mouse button is used or "Ctrl" key is pressed. The logarithmic scale is usually more convenient, but it uses more computer resources. The " SQL " button turns squelch on.

The number to the left of the "SQL" button determines the squelch threshold. When squelch is switched on, the horizontal red line shows the squelch threshold. The " Zoom " menu and " Alt-1 " To move a visible part of spectrogram or waterfall to left or right drag it by mouse with Alt key down. A phase indicator can be used for fine tuning in PSK modes. In ideal conditions you see immovable or slow rotating line there.

Faster rotation means more frequency error. The third from top window shows an oscillogram of the decoded signal.

The received text is displayed on the second from top window. When the RX buffer has grown to about 20kB, part of the data is moved into an invisible buffer. The " AFC " button auto frequency control adjusts the long red lines working frequencies to the closest peak frequencies. The first number is local deviation in hertzs, i. Second number is global deviation in hertzs, i. User-selected frequencies are shown at spectrogram by short red lines.

But this action is not made after click on the ruler under spectrogram. In this mode transceiver radio frequency is changed to consist RX frequency to TX frequency. Auto-tuning is made after click on spectrogram or ruler below. Take to attention that not every transceiver has programmable RIT. In this case auto-tuning by RIT is impossible. The two carriers are exactly symmetrical and therefore redundant. One is on when the other is off. This redundancy lowers the error rate of the decoder.

The two RF carriers have a fixed frequency difference between them. This is how spots should be expressed, for example. Few, if any, humans are skilled at decoding RTTY signals in their head, so hardware or software decoders are used. A simple audio cable between the radio and PC is all the hardware needs. Usually, a stereo audio cable is used to accommodate both the main and sub receivers in the radio.

In MMTTY, the connected soundcard is selected as well as the left or right channel depending on which receiver is desired for decoding.

The thumbnail window is useful for managing your picture resources. However, the English mode still had some Japanese texts. All rights reserved.

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