Kenwood TS-990S Operation Manual - Page 130
Configuring The Rtty Shift Width, Reversing The Frequency In Rtty Mode
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5 ASSISTING YOUR SMOOTH QSO CONFIGURING THE RTTY SHIFT WIDTH The difference in frequency between the mark signal and the space signal is called shift width. You can configure the shift width for communication in RTTY mode. ReversING THE FREQUENCY IN RTTY MODE If the receive RTTY signal is reversed (the mark and shift signal frequencies are reversed), the RTTY signal cannot be decoded properly. In that case, press and hold [FSK/ PSK/REV] to reverse the RTTY signal so as to decode the reversed signal. w/PSNBM w3FWFSTF )[ )[ )[ )[ 1 Select Group No. 2, "Decoding & Encoding", from the Menu screen. 2 Access Menu 06, "FSK Spacing". 3 Press [SELECT] (F4) to allow editing of the parameter box. 4 Press [-] (F4) or [+] (F5) to select "170 [Hz]", "200 [Hz]", "425 [Hz]", or "850 [Hz]". The default is "170 [Hz]". 5 Press [ ] (F1). 6 Press [MENU] to exit. Note: ◆◆You cannot change the RTTY shift width while the RTTY Encode/ Decode screen is open. ◆◆To operate in RTTY mode using the built-in demodulator, encoder and decoder, configure "170 [Hz]" for Menu 2-06, "FSK Spacing". 4QBDF .BSL #'0 #'0 'SFRVFODZ 'SFRVFODZ ,FZJOH$IBSBDUFST KEYING POLARITY .BSL 4QBDF 'SFRVFODZ 'SFRVFODZ CONFIGURING THE POLARITY FOR ACC 2 KEYING If you use an external device for communication in RTTY (FSK) mode, connect its keying signal into pin 2 of the ACC 2 connector. You can configure the polarity for keying pin 2 (RTK) according to the specifications of the external device. If you configure "Off" for Menu 2-07, "FSK Keying Polarity", and short-circuit pin 2 (RTK) to the GND, the transceiver transmits the signal at the mark frequency configured for Menu 2-08, "FSK Tone Frequency". If "On" is configured for Menu 2-07, "FSK Keying Polarity", the space signal is transmitted and the space signal is shifted from the mark frequency by the shift frequency configured in Menu 2-06 "FSK Spacing". d
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