Frequency Reverse In Rtty Mode; Operating Rtty (Fsk) Using An External Device; When Connecting To A Pc (Using The Usb Port); When Connecting To Other External Devices (Using The Acc 2 Connector) - Kenwood TS-890S Instruction Manual

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
170 Hz 2125 Hz
Space Mark
Frequency 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).
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

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".
5-22
Reverse
2125 Hz 170 Hz
BFO BFO
Mark
Frequency
Communication" (1-4).

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

Space
Frequency 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
.
Text Display Area + Vectorscope
.

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.