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PK-232 OPERATING MANUAL PACKET RADIO
The packet timing of the Master station is critical for proper Meteor
Scatter operation. In a normal AX.25 packet connect, the FRACK timer
counts down until it reaches zero and then a Retry of a poll frame is
sent. The FRACK timer counts in units of seconds however and a finer
timing resolution is desirable for Meteor Scatter work. A new timer
called FRICK has been added which times in 10 msec increments. The FRICK
timer can be set from 0 (disabled) to 250 which corresponds to a time of
up to 2.5 Seconds. See the Command Summary for a complete description of
the FRICK timer.
The following settings are recommended for this method of Meteor Scatter
work. Both packet stations should use these same settings.
UBIT IS ON
RETRY 0
AX25L2V2 ON (default)
MAXFRAME 1
(CHECK doesn't matter)
FRICK n, where n is large enough to allow the other station time to send
the start of an
acknowledgment frame
Note:Do not operate the unit with multiple packet connections while FRICK
is active (1-250). In contrast to FRACK, which provides one retry timer
per multi-connect channel, there is only one FRICK timer in the PK-232.
Each logical channel will try to use the same FRICK timer, causing
interference to the operation of the other channels.
Digipeaters should not be used when in the Meteor Scatter mode. The FRICK
timer (unlike FRACK) does not allow any extra time when digipeater
stations are specified.
To return to normal A.X.25 packet operation turn User BIT 18 OFF. Also,
be sure to disable the FRICK timer (by setting FRICK to 0) when you are
through operating in Meteor Scatter mode.
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