RTTY Dual-Tone Filter (DTF)
Hold APF to turn on the RTTY dual-tone filter
(DTF). This creates two filters, one centered on the
mark tone, the other on space, which can often
improve RTTY copy. The filter graphic changes to
reflect this (see below).
When DTF is on, the range of the WIDTH
control is adjusted to better match the
characteristics of the filter. SHIFT, LO CUT and HI
CUT are disabled.
The dual-tone filter can be used with AFSK A and
FSK D. The on/off state of DTF is saved
independently for each of these modes.
FSK Transmit Polarity
You can invert the logic level of the FSK IN line in
FSK D mode using CONFIG:FSK POL. This
should be used only with external keying via
computer programs such as MMTTY; it is not
recommended for use with CW-to-DATA (pg. 36).
Mic Gain, ALC, and Monitor Level
If you’re using an audio-shift transmit mode (LSB,
USB, DATA A, or AFSK A), you’ll need to set
the
MIC level while watching the ALC meter.
You can use the same procedure outlined for voice
modes (pg. 30), except that speech compression
should not be used.
In all cases (SSB modes as well as DATA), you can
optionally use
MON to monitor your data
signals. The procedure given for voice modes can
be used (pg. 30). Voice-mode and DATA-mode
monitor levels are independent.
The
MIC setting does not apply to direct
modulation data modes (FSK D and PSK D),
since no audio is used for transmission. However,
you can still use
MON to monitor the signals.
AMTOR / PacTOR
AMTOR, PacTOR and similar modes can reliably
transfer data – including e-mail – via HF radio
networks. New modes are under development that
may provide even greater reliability. Applications
include maritime mobile and emergency
communications where the light weight and
excellent performance of the K3S are advantageous.
General information regarding K3S set up for these
modes appears below.
• Frequency stability is important in these modes.
A 1-PPM TCXO is available (KTCXO3-1).
• Connect modem audio I/O to the LINE OUT
and LINE IN jacks at the K3S (for LINE OUT,
use the TIP contact of a stereo plug). A PTT
connection is also usually required. If the
modem operates from 12 V (1.0 A or less), it
can be powered from the K3S (12 VDC jack).
• Set up the modem (if applicable). Settings may
vary depending on the data mode being used.
• Locate CONFIG:LIN OUT and set it to 10. A
different level may be better for your modem.
• The SYNC DATA feature can be used to
minimize T-R delays (it forces the same crystal
filter to be used for both receive and transmit).
Locate CONFIG:SYNC DT. Assign it to a
programmable function (e.g., by holding PF1),
then exit the menu.
• Tap MODE to select DATA.
• Select an appropriate data sub-mode by holding
DATA MD, then rotating VFO B. DATA A
(generic data mode, USB) is used in most cases;
see pg. 33 for alternatives, such as AFSK A.
Tap AFX to exit the parameter display.
• Locate MAIN:MIC SEL and set the audio
source for data to LINE IN. Exit the menu.
• If you wish to use SYNC DATA, turn it on by
holding PF1 (or the switch used above). The
–S icon will appear. A CONFIG:PTT RLS
value of 10 to 12 may be ideal in this case.
• Some modes may have very high duty cycles;
use less than full power output if required.
Refer to your application software for instructions
regarding email set up and other operating details.
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