Commercial in confidence 85-909
PLB service manual Issue 4 Page 12
Common problems with message read
Audio tone If not heard then reduce range from 1m to 0.3 m to
help.
Frequency If outside limits, repeat self-test several times to
provide a warm-up.
Bad frame/Data error/
Self test bad/
Unmodulated
This error message occurs if the Reader fails to
synchronize. It may also occur if the antenna is not
deployed, in which case reposition the Reader.
Repeat the test.
BCH2 Error A GPS PLB only transmits the first 112 bits of its
Long (144-bit) Message during self test. This may
cause some readers to report a checksum (BCH2)
error.
Incorrect data Early software versions of Readers may not be
capable of reading GPS long messages.
Note that an exhausted Reader battery can cause bad frames.
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