Philips Components
Desktop video & FM radio module
system CCIR I
Preliminary specification
FM1246
Definitions of test signals (see Fig.2)
TEST SIGNAL
A0: unmodulated vision
carrier
A1: CCIR I standard signal
with video modulation
B1: unmodulated sound
carrier I system
B2: FM modulated sound
carrier I system
B3: unmodulated sound
carrier I system
C1: FM modulated sound
carrier
C2: FM modulated sound
carrier
C3: FM modulated sound
carrier
C4: FM modulated sound
carrier
C5: unmodulated sound
carrier
FREQ.
(MHz)
AMPLITUDE
480.25 60 dBµV
VIDEO
MODULATION
AUDIO
480.25
486.25
60 dBµV
(top sync)
−7 dB w.r.t. A1
100% (rest carrier 10%)
2T pulse and bar
486.25 −7 dB w.r.t. A1
478.25 −15 dB w.r.t. A1
1 kHz; modulation frequency
deviation ±27 kHz;
50 µs pre-emphasis
87.5 60 dBµV
98.0 60 dBµV
108.0 60 dBµV
98.0 60 dBµV
98.0 60 to 100 dBµV
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
1 kHz; modulation frequency
deviation ±22.5 kHz
Aerial input characteristics
SYMBOL
PARAMETER
VSWR reflection coefficient
VPSM
Vant
surge protection voltage
antenna connection disturbance
voltage
CONDITIONS
MIN.
referred to 75 Ω impedance
(worst case on or between picture
and sound carrier at maximum gain):
all channels in TV mode
−
FM (centre of channel)
−
5
<1.75 GHz
−
MAX.
5
4
−
46
UNIT
kV
dBµV
1997 May 14
9