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USER'S GUIDE
n
ADELAY
Mode: AMTOR
n
Parameters:
-
ADELAY
is the length of time in tens of milliseconds between the instant when the PK-232 acti-
vates the transmitter's PTT line and when the ARQ data begins to flow to the transmitter. Some de-
lay is necessary with any radio transmitter.
All transmitters need some finite amount of time to switch from receive to transmit and to de-
velop their nominal power output.
ADELAY
The
command allows you to adjust a variable delay, from 10 to 90 milliseconds, intro-
duced by the PK-232 in handling the PTT (Push-to-Talk) line activation and data flow in the AMTOR
mode.
In most cases, the default value of 4 times 10 (40) milliseconds will be adequate for most of
the popular HF transmitters.
If necessary, you can reset other values with the
As an indication that adjustment is required, you may observe symptoms of periodic errors caused
by loss of phasing, shown by rephase cycles in the middle of an ARQ contact. This will occur in
spite of strong signals and low QRM levels.
Be sure that errors and rephasing effects are not provoked by the distant station before chang-
ing your defaults.
If changing your ADELAY values does not improve link performance, reinstall your original or
default values.
Because the ARQ mode allows 170 milliseconds for the signal to travel to the distant station and
than return, increasing
millisecond, the maximum theoretical range of an ARQ contact is limited to about 25,500 kilo-
meters. Using some of the time as transmit delay leaves less time for signal propagation. Thus the
maximum distance available is restricted – the signal cannot cover as great a distance.
ALFDISP ON|OFF
Mode: All
Parameters:
ON -
OFF - A <LF> is not sent to the terminal after each <CR>.
ALFDISP
controls the display of carriage return characters received in packets as well as echoing
those that are typed in.
ALFDISP
When
is ON, your PK-232 adds a line feed <LF> to each carriage return <CR> received
if needed. If a line feed was received either immediately before or after a carriage return,
will not add another line feed. Use the PK-232's sign-on message to determine how carriage re-
turns are being displayed.
ALFDISP
Set
ON if the PK-232's sign-on message lines are typed over each other.
Set
ALFDISP
OFF if the PK-232's sign-on message is double spaced.
PK232UG Rev. B 9/86
Mnemonic: AD
1 to 9 specifies transmitter key-up delay in 10-millisecond intervals.
ADELAY
will reduce the maximum working distance. At 300 kilometers per
Mnemonic: ALFD
A line feed character <LF> is sent to the terminal after each <CR>.
Default: 4 (40 msec.)
ADELAY
command.
Default: ON
6-15
COMMAND SUMMARY
ALFDISP
117
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