Specifications

PK-232 OPERATING MANUAL COMMAND SUMMARY
FRIck "n/n” Default: 0/0 (0 sec.)
Mode: Packet Host: FF
Parameters:
“n” — 0 to 250, specifying the Frame Acknowledgment timeout for
Meteor Scatter work in 10 milli-second intervals.
FRICK is a short version of FRACK, meant to be used in packet radio meteor
scatter work. If FRICK is 0 (default), the FRACK timer is then in use and the
unit operates as before with the retry timer in units of whole seconds. If FRICK
is 1 to 250, FRICK overrides FRACK as the unit's retry timer, and the retry timer
is in units of 10 msec. up to 2500 mode. (2.5 seconds).
Unlike FRACK, FRICK does not take into account the number of digipeaters in the
connect path. FRICK assumes there are no digipeaters being used.
Note: Do not attempt 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.
Due to the sporadic nature of meteor scatter work, a Master/Slave mode can be
enabled in the PK-232 with User BIT 18 (UBIT 18). When UBIT IS OFF, Frame
Acknowledge operation is as in previous firmware versions.
When UBIT 18 is ON, a master/slave relationship is established in packet radio
connections. This is done to reduce the possibility of simultaneous
transmissions by both sides of a packet connection. In this mode, the master
station sends either an I-Frame or a polling frame upon the expiration of FRICK
(or FRACK if FRICK = 0). The FRICK or FRACK timer then starts counting again.
The master station therefore sends packets constantly, even if all its I-frames
have been acknowledged. The slave station sends nothing, not even I-frames,
until it receives a polling frame from the master. A station becomes the master
upon its transmission of a SABM (connect) frame; a station becomes the slave upon
its transmission of a UA (acknowledgement of the SABM) frame.
Recommended settings for this method of meteor scatter work (both stations should
use these settings):
UBIT IS ON
RETRY 0
AX25L2V2 ON (default)
MLXFRAME 1
(CHECK doesn't matter)
FRICK n, where n is large enough to allow the other station time to
send the start of an acknowledgement frame
Note; This is an experimental mode and we welcome any comments or suggestions you
might have. Please make them in writing and direct them to the Timewave
Engineering Department. Thank You.
2/93 A-40a
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