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USER'S GUIDE
o
Don't send long CQ calls with many lines of repeated call signs. FEC eliminates the
need for long CQ calls. A simple "3 by 3" sequence is all you need in FEC. Here's
one example:
Wait several seconds before starting to type your CQ call or traffic!
o
The distant station must receive several seconds of synchronous idle control
characters to synchronize with your system. The distant station cannot synchronize
to your typed characters.
o
Do not start an FEC transmission with "RYs" as in conventional RTTY. The distant
station cannot synchronize with RY characters.
The synchronous idle control signals are mark-to-space tone shifts and can be used by the
distant station for tuning.
4.5.6.1
LED Status and Mode Indicators
After typing FEC, your PK-232 displays system status on its LEDs:
STATUS:
MODE:
Your Transmitter is now keyed and sending the FEC "idle" signals. As you type your
comments or traffic, the IDLE LED is extinguished; the TFC LED is lit during the mo-
ments when your PK-232 is sending your data characters. Whenever you stop typing
characters, the TFC LED is extinguished and the IDLE LED is lit.
STATUS:
MODE:
4.5.6.2
Mode B (FEC) Changeover
FEC operation is very similar to conventional RTTY. You can tell your partner at the dis-
tant station that you're ready for him to send by typing the same "K", "KN" or "BTU"
signals.
Except for the short delay in starting before sending your traffic, you can operate FEC
using the same typing and receiving techniques as in CW or conventional Baudot and
ASCII RTTY. The FEC mode does not use interaction or "handshaking" between your
station and the distant station.
o The
+?
PK232UG Rev. B 9/86
CQ CQ CQ DE W2JUP W2JUP W2JUP (WJUP)
CQ CQ CQ DE W2JUP W2JUP W2JUP (WJUP)
CQ CQ CQ DE W2JUP W2JUP W2JUP (WJUP)
QRR ARQ/FEC SELCAL WJUP +?
SEND lit, IDLE lit, TFC lit only briefly
FEC lit
SEND lit, TFC and IDLE lit alternately by data flow
FEC lit
changeover command has no effect in FEC operation.
IMPORTANT NOTE
4-14
OPERATING MODES
67
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