180 Part H: Diagnosing © Tait Electronics Limited December 2007
Once any sub-audible tone is detected, the scan stops until that tone is
removed. This prevents repetitions of the same tone from being displayed,
but does mean that when there is more than one possible decode tone, only
the first one found will be reported. For example, DCS025 and DCS244
(inverted) share the same bit-sequence. If one of these codes is applied dur-
ing a scan, the scan will at random report one or the other.
Similarly, if a low-frequency CTCSS tone is present with a high deviation,
so that it can be detected by multiple filters, then only the lowest successful
tone frequency will be reported. For instance, with the “T800” CTCSS
characteristics selected, if a tone of 69Hz is applied with 20% deviation, then
it will be reported as a 67Hz tone, not as a 69.4Hz tone. This effect can be
reduced by selecting the “EIA603” characteristics, which narrows the
CTCSS filters at low frequencies (Configure > Base Station > Miscellane-
ous).
3. If desired, check the current receive frequency (Monitor > Monitoring >
Channel).
4. When you are ready to stop scanning, click Stop Monitoring.
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