Specifications

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frequency range, either from the currently displayed frequency traveling upwards
(or downwards) in a specified tuning increment (step) or by sweeping
over-and-over between two specified frequency limits. This process is known as
SEARCHING, as the title implies, it can take a long time to find transmissions due
to their ‘often intermittent’ and brief nature. For this reason it is best to slice large
frequency ranges into smaller, more manageable pieces where they may be
intensively studied.
When examining large frequency bands, it is common to find that 90% of
frequencies are inactive and only a small number of the remaining constitute what
you really want. Searching still remains the best way to initially locate active and
interesting transmissions (in conjunction with a good frequency listing and band
plan).
SCAN: Once active transmission have been identified (either by searching or by
using a good frequency guide), it is more efficient to store the data into memories
which can be rapidly and automatically monitored in succession, stopping when
activity is encountered. This forms a much more efficient means of monitoring the
most wanted frequencies as you have targeted 100% what you most want to hear,
by contrast searching is very inefficient for day-to-day monitoring.
Note: It is very important that the squelch is advanced to cancel background
noise for the search & scan functions to operate. This is because the
AR-ONE believes that it has found an active frequency when the squelch
opens and “S” ‘squelch open’ icon is displayed to the left of the signal meter.
Advance the squelch control clockwise until the background noise is just
cancelled, this is known as the threshold position. If the squelch control is
advanced too far, weaker signals may be missed.
No noise and no “S” icon displayed (with squelch advanced clockwise
passed threshold) = squelch closed.
Signal received or ‘noise’ emanating from speaker (squelch fully
counterclockwise, below threshold) with “S” icon displayed = squelch open.