Kenwood TS-990S - Manual (Page 125)

5-47
ASSISTING YOUR SMOOTH QSO 5
Index Contents
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.
Keying Characters
Space
Frequency
Mark
Frequency
• Normal • Reverse
170 Hz 2175 Hz 170 Hz 2175 Hz
BFO Space
Frequency
Mark
Frequency
BFO
KEYING POLARITY
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”.
[F1] [F7]
[FSK/PSK/REV] [MENU] [MULTI/CH]
1 Select Group No. 2, “Decoding & Encoding”, from the
Menu screen.
2 Access Menu 07, “FSK Keying Polarity”.
3 Press [SELECT] (F4) to allow editing of the parameter box.
4 Press [-] (F4) or [+] (F5) to select "On" or "Off".
The default is “Off” (transmitting at the mark frequency by
shorting pin 2 to GND). Selecting “On” allows the transceiver
to transmit the space signal shifted for the mark frequency.
5 Press [ ] (F1).
6 Press [MENU] to exit.
USING AN EXTERNAL DEVICE FOR RTTY
MODE OPERATION
You can use an external device and operate the
transceiver in RTTY (FSK) mode without using the built-in
demodulator, encoder or decoder built in the transceiver.
Connect to the transceiver a TNC suitable for RTTY
communication or a PC that allows the use of applications
for RTTY communication so that you can operate the
transceiver in RTTY (FSK) mode.
Refer to the following page for operation examples.
• Connection to a PC {page 1-5}
• Connection to other transceiver with TNC
terminal {page 1-7}
• Connection to a TNC, MCP, etc. {page 1-8}
Note:
◆ If the shift width for RTTY mode exceeds 170 Hz, the audio peak
filter for the selected band cannot be enabled