EF-701M INTERFACE 3-7
Unsatisfactory null. 1. Unstable PL system due to
excessive cabling, a high number of
stations, transformers connected
across the intercom channel, or
other PL equipment issues such as
termination.
2. Too many EF-701M units on
channel.
1. Verify operational status of PL
equipment.
2. Remove EF-701M units from the
network. If nulls on the remaining units
improve, the problem was too many
EF-701M units. This should not occur
until approximately seven or more units are
sharing a channel. However, as systems vary
in size and complexity, a user could
experience difficulty nulling as few as two
EF-701M units, each connected to a very
large system.
Symptom Cause Solution
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