Kenwood TS-890S Operation Manual - Page 78

5 COMMUNICATING AIDS .. . Frequency Reverse in RTTY Mode Decoding cannot be performed correctly when the RTTY signal received is in the reverse state (frequencies of the mark signal and space signal are reversed). When this occurs, press and hold [FSK/ PSK] to reverse the RTTY signal received so that the reverse signal can be decoded. Normal Reverse 170 Hz 2125 Hz 2125 Hz 170 Hz Space Frequency Mark Frequency BFO BFO Mark Frequency Space Frequency Operating RTTY (FSK) Using an External Device To operate in the RTTY mode using a PC or other external devices (such as RTTY device or PC connection interface) instead of the built-in encoder and decoder functions of this transceiver while this transceiver is configured to the RTTY (FSK) mode, connect using the USB port or ACC 2 connector on the rear panel of this transceiver. When connecting to a PC (using the USB port) • RTTY keying: Configure the USB keying function to "RTTY Keying". • TX control: Use PC commands ("TX;" to start transmission and "RX;" to end transmission). Or configure the USB keying function to "PTT". • Audio output: Select "USB AUDIO CODEC" for the recording device using the sound setting on the PC. For more details on the USB keying function, please refer to "USB Keying" (16-12). Audio Peak Filter Using the audio peak filter may help to improve the decodability of RTTY messages when operating in the RTTY (FSK) mode with this transceiver connected to an external device. Press F [APF] to set the audio peak filter to ON. • When audio peak filter is turned on, "ON" is displayed in the lower row of F [APF]. • When audio peak filter is turned off, "OFF" is displayed in the lower row of F [APF]. PSK Operation This transceiver is equipped with a built-in demodulator, encoder and decoder for operating in the PSK31 and PSK63 modes. Operation in the PSK31 or PSK63 mode can be performed easily by connecting a commercially available USB keyboard. PSK can also be operated using a data communication software program that makes use of the sound function of a PC. ● When transmitting in the PSK mode, adjust the carrier until the ALC meter starts to deflect. ● When an external device is used, adjust the audio signal level from the external device, followed by adjusting the ALC meter until it starts to deflect. Displaying the PSK Communication Screen 1 Press [FSK/PSK] to select PSK mode. 2 Press F3 [DECODE]. The PSK communication screen appears. Text Display Area + FFT Scope When connecting to other external devices (using the ACC 2 connector) • RTTY keying: Connect pin 2 (RTTY) of the ACC 2 connector to the keying output line of the external device. • TX control: Connect pin 13 (SS) of the ACC 2 connector to the TX control (PTT) line of the external device. • Audio output: Connect pin 3 (ANO) of the ACC 2 connector to the demodulation input line of the external device. * For more details on the ACC 2 connector, please refer to "ACC 2 Connector" (1-7). For more details on other connections and settings, please refer to "PC Connection for Data Communication" (1-4). Text Display Area + Vectorscope RTTY (FSK) Keying Polarity Setting Configure in Menu [2-07] "FSK Keying Polarity" Setting Value Off (default)/ On • Configure the RTTY keying polarity according to the specifications of the external device. When Menu [2-07] "FSK Keying Polarity" is configured to "Off" and pin 2 (RTTY) is short-circuited to GND, signals are transmitted at the mark frequency configured in Menu [2-08] "FSK Tone Frequency". • When Menu [2-07] "FSK Keying Polarity" is configured to "On", signals are transmitted as space signals with the mark frequency shifted by the amount configured in Menu [2-06] "FSK Spacing". Switching between the FFT Scope and Vectorscope Display The display toggles between the "FFT scope" and "Vector Scope" each time the scope display on the screen is touched. ● Noise Reduction 1, Noise Reduction 2, Beat Canceler 1, Beat Canceler 2 and RX DSP equalizer do not function during decoding of PSK messages. 5-22