4.4.7.2 Canceling Lines and Packets
Most of the time, the Backspace key (or the Delete key on some
machines) is all that is needed to edit a line before it is sent.
Occasionally it may be helpful to cancel the line, or the entire
packet you are entering with one key stroke. The CANLINE character
(default <CTRL-X>) will cancel the entire line you are typing. The
CANPAC character (default <CTRL-Y>) will delete the entire packet you
are entering. These commands can be helpful, but use them with care.
4.4.7.3 Redisplay
If you have erased and retyped lots of characters, you may want to see
"fresh" input, especially if BKONDEL is OFF. This will also allow you
to display any packets you might have received while you were typing.
Your PK-232 will show the line you're entering when you type the
REDISPLAY character (default <CTRL-R>).
4.4.7.4 The PASS Character
If you are terminal or terminal program, the following may be useful.
Sometimes you may want to include a special input character such as a
Carriage Return (the SENDPAC character) in a packet. For example, to
send several lines in the same packet, you must include <CR> at the
end of each line. You can include any character in a packet
(including all special characters) by prefixing that character with
the PASS character <CTRL-V>:
I wasn't at the meeting.<CTRL-V><CR>
What happened?
Without the PASS character, this message would go out as two packets.
By prefixing the first <CR> with <CTRL-V>, you send it all at once,
while maintaining the <CR> as part of the text. The PASS character
can be useful in formatting text Messages such as CTEXT as well.
4.4.8 Packet Transmit Timing
Your PK-232 has a number of built-in timers used to control the packet
protocol and transmit timing. The default values have been set at the
factory to provide reasonable performance, but the values may not be
optimum for your local area. Most protocol parameters should be
adjusted only after carefully reading about them later in the chapter.
You SHOULD adjust TXDELAY for your transmitter as indicated below.
4.4.8.1 TXDELAY and AUDELAY
Radios vary in the time it takes to switch from receive to transmit.
If your PK-232 starts sending data before your transmitter is up to
power, the packet will not be received properly at the distant end.
TXDELAY controls the delay between your transmitter's key-up and the
moment when your PK-232 starts sending data. The default value of 30
corresponds to a time of 300 mSec and works with most VHF/UHF FM
transceivers. With modern transceivers TXDELAY can often be reduced
which will improve packet performance in your area. You should
perform the following procedure to optimize TXDELAY for your station.
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