27
Data Modes
The KX2 supports data operation via a computer and
special software. But it can also be used in RTTY and
PSK31/PSK63 modes without a computer, thanks to
the built-in FSK D and PSK D modes.
5.0 watts or lower is recommended in all data
modes. The KX2 will reduce power, if necessary, to
maintain a safe operating temperature.
Mic gain, RX/TX EQ, and TX CMP are not
applicable to FSK D and PSK D modes.
FSK D Mode (RTTY)
FSK D (RTTY
1
) is the easiest data mode to use:
§ Tap DATA to select data modes.
§ Tap DATA again and rotate
OFS/B to select
the FSK D sub-mode. Tap the switch again to exit
the sub-mode display. A dual-passband
(mark/space) filter will appear:
§ Hold TEXT to turn on text decode.
§ The sideband can be reversed (MENU:ALT MD).
§ Optionally turn on the tuning aid (CWT, pg. 21).
1
FSK stands for frequency-shift keying, used with RTTY
(radioteletype). The KX2 uses a 170 Hz shift. RTTY signals
You’ll now be able to copy RTTY signals. If you see
only numbers and punctuation, try tapping DATA
twice to restore “letters” mode.
RTTY stations can most often be found on 20 m, from
14080-14090 kHz. Other popular “watering holes”
include 80 m (3570-3600), 40 m (~7040 and ~7080),
17 m (~18100), and 15 m (~21080). During contests,
stations spread out over a much wider range.
To transmit in FSK D mode (CW-to-Data): Plug a
keyer paddle into the KEY jack, or attach a KXPD2 (or
KXPD3) paddle at the front of the KX2. (See the CW
KEY1 and CW KEY2 menu entries.) When you send
CW, the KX2 will convert it to RTTY. (You’ll hear the
CW sidetone as well as weak RTTY tones.)
You can use CW message memories in FSK D mode,
as well as with KX2 Utility’s Terminal function (pg.
35). FSK-D mode transmit text can also be captured
for logging purposes (see MENU:LOGGING).
You cannot use a hand key for FSK D transmit.
The KX2 adds a 4-second “idle time” (giving you
time to decide what to say next) each time you stop
sending. At the end of this period, the receiver is re-
enabled. To terminate the idle period quickly, send
the character
. .
- - in CW. This “IM” prosign can
also be inserted at the end of a message. It will not be
transmitted on the air, but you’ll hear it in your CW
sidetone.
are encoded using a 5-level code called baudot, at a baud
rate of 45 baud, or about 60 words per minute.
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