60
VPC5000 Series Vehicle PC Installation Manual ver.A.1
6.8 Frequency/Voltage
Control
Figure 6.8.1: Frequency/Voltage Control
Figure 6.8.2: Frequency/Voltage Control
6.8.1
Auto Detect PCI Clk
The default setting is enabled.
6.8.2 Spread
Spectrum
Enable spread spectrum clock modulation to reduce EMI.
VPC5000 Series Vehicle PC Installation Manual verA.1
61
Appendix A AM/FM/TV Transmission
FM/TV signal of
radiation
The signal of FM/TV
radiation is similar to light, it
would be reflex. FM signal
is different to AM signal, it
cannot radiate from
ground, therefore, its signal
cannot be as long as AM’s.
Multi- journey signal
noise
Because of the obstruction
will reflex FM’s signal, it
might also receive others
straight signal and reflex
signal. It makes signal
delay when receiving or it
might receive staccato or
distortion. The problem
sometimes occurs when
system is near to radiation
station.
Noise occurred with
vibration / saltatory
Since the FM signal is
straightly, and when the
signal is
transmit
through valley or
between buildings and
others obstruction,
signal will becomes
weak. When vehicle
pass through above
area, it will receive
noise.
