phenomenon can be occurred, because the different PI code can be
received from 100 MHz with "XXX"PI.
The car radio has special procedure to reduce even this kind of
unavoidable situation however there is a limit to be escaped from this
serious case perfectly.
In that serious case, 2 mode is selectable as follows:
- PI SOUND mode:
When above different PI sound (DIP) is heard once in a while, the DIP's
sound will be heard for a short time.
- PI MUTE mode:
Under above same situation, a mute sound will be heard for a short time.
c) RETUNE L or RETUNE S mode
The initial time of automatic TA search or PI search modes is selected.
When PI information is not caught for retune time, the radio starts to
retune to next same PI station.
When same PI station does not catch 1 cyclic search, the radio goes to
last station and waits for several minutes until PI code is received.
- RETUNE L mode:
Selected as 90 seconds.
- RETUNE S mode:
Selected as 30 seconds.
d) MASK DPI or MASK ALL mode
The AF frequency (which has different PI or NO RDS signal with high field
strength) is masked during checking PI when the unit searches AF. The
unit doesn't search this AF (DIP) for few minutes. In the case of the AF of
NO RDS signal with high field strength, if the real AF is wrongly masked
as DIP by some interference, the unit hesitates to search real Afs.
For this reason, the unit has the user option (MASK DPI) which doesn't
mask the AF of NO RDS signal with high field strength. In MASK DPI
mode, the wrong sound or long mute (according to PI SOUND or PI
MUTE) can be heard from the AF station which has NO RDS signal and of
which the field strength is higher than that of the currently tuning AF