MMTTY version up information *********************************************************************** Revision history Ver1.65B -> Ver1.65D *********************************************************************** - Added a gateway to Turbo Hamlog/Win version 5 (Tnx to JG1MOU) - Fixed minor bugs - Fixed problem in setting path to MMTTY in program shortcuts. *********************************************************************** Revision history Ver1.65 -> Ver1.65B *********************************************************************** - Added support for new help format - Fixed minor bugs *********************************************************************** Revision history Ver1.64 -> Ver1.65 *********************************************************************** - Fixed a bug that caused the uncertain transmission in the remote mode. - Fixed minor bugs *********************************************************************** Revision history Ver1.63 -> Ver1.64 *********************************************************************** - Improved the TX/RX switching speed in FSK - Added custom log link - Added custom RadioCommand - Added custom sound - Added custom TNC emulation - Fixed minor bugs *********************************************************************** Revision history Ver1.62 -> Ver1.63 *********************************************************************** - Improved the low-level sound buffer processing - Added the full-duplex mode - Added TX offset for the soundcard - Supported BARTG contest (serial number + UTC) - Moved the RX log settings from the setup menu to the File menu - Added JST245 support in frequency polling - Added a menu for the version up information - Added EXTFSK port (EXTFSK.DLL required) - Added an option to accommodate J-BELL and S-BELL code sets - Improved the program termination speed - Supported WM_MOUSEWHEEL message - Fixed some minor bugs ================================== Improvement on the low-level sound processing ================================== The low-level sound processing has been improved. The user can preset the sizes of TX and RX FIFO buffers even independently. If you frequently see "Sound lost" in the spectrum scope window, try increasing the sizes of the FIFO buffers. Click on Option, Setup MMTTY, and Misc tab. You will find the drop down list for presetting the sizes at the top left corner of the window. * MMTTY now automatically adjusts the buffer size, which was defined in the Setup menu in the previous MMTTY versions. ================================ Full duplex mode ================================ Version 1.62B has an option that simultaneously runs the record and play functions of the soundcard, so that it can make the external loop back possible. This is useful for the satellite communication and the monitor of the FSK operation. Click Option, Setup MMTTY, and Misc tab. Select Ext.(SAT) in the Sound loopback pane to enable the full duplex mode. The local echo option in the TX window of the Setup MMTTY has been deleted as it would result in the same effect as the no loop back mode. The internal linkage of the TX and RX modules for the no loop back, internal loop back, and external loop back modes are as follows: TxData ---> Modulator ---> Sound Out --> | --> RX window TxData ---> Modulator ---> Sound Out --> | --> Demodulator -> RX window TxData ---> Modulator ---> Sound Out ----> -- Sound In <-- | --> Demodulator -> RX window =================================== TX offset =================================== Some soundcards inadvertently have different sampling frequencies in the record (RX) and play (TX) operations. With MMTTY version 1.62A, the user can calibrate the sampling frequency for TX. The parameter to be set in the TX offset is the same as that of MMSSTV. To obtain the precise value of the parameter, you have to use MMSSTV. In the case of RTTY, however, the TX offset is not necessarily very accurate contrary to SSTV. So the simple adjustment procedure shown below should give enough accuracy for RTTY. 1) Adjust the RX sampling frequency. 2) Click on Option, Setup MMTTY, and Misc tab. Select Ext.(SAT) in the loop back. 3) Connect the output and input of the soundcard, or select "loop-back" or "Stereo/monaural mixer" in the mixer program of the volume control. 4) Adjust the TXOffset so that the twin peaks in the spectrum scope are on the line marker. According to my experiences, recent soundcards tend to come into one of the following three categories. RX TX TX offset ~11025 ~11025 0 ~11025 ~11100 75.00 ~11100 ~11025 -75.00 Therefore, if you find some discrepancy in the spectrum scope, try putting 75.00 or -75.00 in the TXOffset. In RTTY, offset frequency 75Hz with respect to base frequency 11025Hz results in 5 to 15Hz frequency discrepancy. The baud rate discrepancy is about 6800ppm (0.68%). RTTY has substantial amount of margin for the discrepancies, so I do not think they are problematic in real QSOs. ================================================ RX log setting moved from the setup menu to the File menu ================================================ To save the system resources in the remote mode, the settings of the RX log have been moved from the setup menu to the File menu. Click on File and select Options of received-log. ================== EXTFSK port ================== EXTFSK is used for the USB-FSK interface made by JA7UDE Oba. To use the EXTFSK port, select EXTFSK from the PTT port drop-down list in MMTTY Setup window. EXTFSK.DLL must exist in the same folder where MMTTY is installed. For more information, refer to the following web site. http://www.archi.is.tohoku.ac.jp/~ooba/ja7ude 73, Mako