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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
Repetitive steps (after 0.5 sec)
- 12.5 steps/sec
- De-mute at key release
- Frequency step size:
SW LW MW FM
USA 1 - 10 200 kHz
Europe 1 1 9 100 kHz
PRE UP
FREQ DOWN
AUTO/MAN
PRESET
MODE
MANUAL
TUNING
MODE
AUTOMATIC
SEARCH
MODE
AUTO/MAN
AUTO/MAN
6 sec
timeout
PRE DOWN
1
2
FREQ UP
3
4 5
6
PRE UP PRE DOWN
1
2
3
4 5
6
Figure 13 Tuning modes
In search tuningmode, after pressing theFREQ-UP / FREQ-DOWN key,the frequency starts runningand
will stop on either a new frequency or at the frequency from which the search was started. For this search
action two criteria are taken into account:
- search sensitivity Local (high signal level) or Dx (low signal level).
- Ta mode on, the search will only stop at traffic programmes.
When the radio is in Local mode and after one band sweep no station was found, the search sensitivity
is switched to Dx. If still no valid station can be found, the radio returns to the frequency from which the
search was started.
Depending on these criteria a maximum of two band sweeps will be made, trying to offer a frequency
fulfilling the search criteria.
For FM, a Local / Dx switch is incorporated in the TEA6811. Putting the radio in Local mode results in an
attenuation of the aerial signal with 15 dB. For AM,the signal levels read back from the TEA6822 are used
to create the Local /Dx functionality. In AM mode, the search stop level for Local is set 22 dB higher than
when the radio is in Dx-mode.
During a tuning action - manual or automatic - the display will show the running frequency at any time.
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