Kenwood TS-990S - Manual (Page 126)

5-48
5 ASSISTING YOUR SMOOTH QSO
Index Contents
AUDIO PEAK FILTER
For operation in RTTY mode with an external device
connected to the transceiver, this filter will improve the
readability of the RTTY message.
1 Press [FSK/ PSK/ REV] to enter RTTY (FSK) mode.
2 Press [APF] to enable the Audio Peak Filter.
The "APF" LED lights.
Note:
◆ You cannot enable the Audio Peak Filter until "170 [Hz]" is
configured for Menu 2-06, "FSK Spacing".
◆ Even if Audio Peak Filter becomes active, the Audio Peak Filter
does not apply to the internal demodulator.
PSK OPERATION
The transceiver incorporates a demodulator, encoder and
decoder for PSK31 or PSK63 operation. You can use a
commercially available USB keyboard in combination with
the transceiver for operation in PSK31 or PSK63 mode.
You can also use a PC and software for operation with the
transceiver.
PRECAUTION
◆ For transmission in PSK mode, adjust the drive until the ALC meter
just begins to swing. If you use an external device, adjust the audio
signal level of the external device so that the ALC meter just begins
to swing.
OPENING THE PSK ENCODE/DECODE SCREEN
[F1] [F7]
[FSK/PSK/REV] [ESC]
1 Press [FSK/ PSK/ REV] to enter PSK mode.
2 Press [DECODER] (F3) to open the PSK Encode/
Decode screen.
3 Press [ESC] to exit.
MAIN SCREEN
SUB-SCREEN
Note:
◆ Noise Reduction 1, Noise Reduction 2, Beat Cancel 1, Beat Cancel
2, Audio Peak Filter and the RX DSP equalizer do not function for
PSK message decoding.