I find the iDEN signals a real pain when trying to search a sub-section
of the 851-866 band. Depending on the scanner, it may or may not
get stuck on these signals. The ones that do, usually do so +/-12.5kHz
above the actual signal center frequency.
The PRO-2004 squelch can be adjusted so that it stops at them for
a short time, then moves on. Most other scanners I have used get
stuck. Ones with search lockout (BC235 etc.) have a limit to the
number of lockouts (20).
Dave