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MFJ-1278B MULTI-MODE ADVANCED OPERATION
Initial Parameter Settings Summary
The settings for use at 1200 baud on a VHF FM channel are:
ACKprior ON
SLots 3
DEAdtime 33
ACKTime 13
RESPtime 0
If you require a nonzero value for this parameter in order to prevent ACKing individual
packets in a MAXframe greater than 1 blast, your DCD circuit is not working. Please get it
fixed.
DWait 0
DWait should be set to 0 even if there are digipeaters on the channel. The new system will
not degrade the performance of digipeaters on the channel because the ACKWAIT can be
used by the DIGI.)
MAXframe 1 - 7 depending on channel quality
FRACK 3
The settings to use for 300 baud work on a linear mode HF channel are:
ACKprior ON
SLots 3
DEAdtime 12
ACKTime 52
DWait 0
RESPtime 0
MAXframe 1
FRACK 8
What to Expect
This modification to the protocol is compatible with stations using the current protocol in the
following respect. A station using the new protocol will not degrade the channel for users of
the current protocol. So there is nothing wrong with firing up the new stuff on a channel
where the majority of the users aren't yet using it. You will be able to communicate with
users of the other system without difficulties.
However, if the users of the old channel access procedures have DWait and RESPtime set to
0, they will tend to hog the channel from users of the newer, more polite access system.
Therefore, for purposes of testing the effect of the new system on channel throughput, if there