TV Test Transmitter ¸SFM 9
Group-delay response
Double-sideband modulation,
precorrection off, vision
carrier ±5 MHz ≤10 ns
Group-delay precorrection
0 MHz to 4.43 MHz ≤10 ns
4.43 MHz to 4.8 MHz ≤15 ns
Vestigial-sideband modulation additional ripple due to SAW filter
B/G ≤20 ns (–4.8 MHz to +0.5 MHz)
D/K ≤20 ns (–5.5 MHz to +0.5 MHz)
I≤30 ns (–5.2 MHz to +1 MHz)
L/L’ ≤20 ns (–1.25 MHz to +6 MHz)
M, N ≤20 ns (–4 MHz to +0.5 MHz)
Residual carrier
Setting range 0% to 30%
Resolution 0.1%
Error <1.5%
Modulation nonlinearity
Modulation in range 8% to 100% ≤1.5% (for standards with negative modula-
tion)
Differential gain error
for colour subcarrier modulated
in range 10% to 85 % ≤1.5% (for standards with negative modula-
tion)
Differential phase error
for colour subcarrier modulated
in range 10% to 85 % ≤1°(for standards with negative modulation)
Video signal-to-noise ratio
Double-sideband and vestigial-
sideband modulation,
measured to ITU-R Rec. 567
rms, weighted, 0.2 MHz to 5 MHz ≥70 dB
hum, peak-to-peak, 0 kHz to 1 kHz ≥60 dB
Intercarrier signal-to-noise ratio
FuBK test pattern 56 dB (30 kHz deviation)
All-black picture 58 dB (30 kHz deviation)
Intermodulation measurement (fixed programs)
(Level in dB) Vision Sound Sound Sideband
carrier carrier 1 carrier 2*)
Intermodulation IM 0 –10 –20 off
IM/K –8 –10 –20 –16.5
IM/B –5.5 –11.5 –20 –12
Linearity LIN1 –2.5/–8 –10 –20 –32
LIN2 –2.5/–20 –10 –20 –32
*) In connection with NICAM Modulator ¸SFM-B10 only.
(Linearity measurement with vision-carrier level switching every 2 s)
Sound 1 modulator, sound 2 modulator
AF signal input
B/G, D/K, I, M, N, K1 +6 dBm (1.546 V rms) for 0 kHz to ±100 kHz
deviation, floating, Zin >5 kW,
switchable internal/external
L/L’ +6 dBm (1.546 V rms) for m = 0% to 100%
Sound-carrier IF
Frequency settable
Setting range |fvision carrier– fsound| ≤7 MHz
Accuracy <2 × 10-6
Level settable
Accuracy at standard level
Sound
1: –13 dB with B/G, D/K, I, M/N
≤±0.5 dB
–10 dB with K1
Sound
2: –20 dB with B/G, D/K, L
≤±0.5 dB
Accuracy over setting range
Sound 1 referred to –6 dB
–6 dB to –16 dB ≤±0.3 dB
>–16 dB to –34 dB ≤±0.6 dB
Sound 2 referred to –12 dB
–12 dB to –22 dB ≤±0.3 dB
>–22 dB to –38 dB ≤±0.6 dB
Specifications
Vision modulator
Video input signal (standard level) 1 V pp into 75 W
Standards B/G, D/K, I, K1, L/L’, M, N
Video input 1 on front panel with loop-through filter (high-
impedance), with internal or
external 75 W termination
2 on rear panel (75 W)
Connectors BNC
Selection of inputs automatic or manual
Return loss (0 to 6 MHz) >34 dB for all video inputs
IF output signals
Frequency drift
(internal 10 MHz reference) <2 × 10-6
Vision-carrier frequency with
vestigial-sideband filter (SAW) 38.9 MHz for B/G, D/K, I
32.7 MHz for L/L’, K1 (sound: mono)
38.9 MHz for L/L’ (sound: mono/
NICAM)
45.75 MHz for M, N
Vision-carrier frequency with
double-sideband modulation 32 MHz to 46 MHz, selectable in 10 kHz steps
over the full range
IF output level –3 dBm ± 0.5 dBm into 50 W
IF output 1 internal (for RF upconverter)
1 external (for 50 W termination)
Harmonics suppression
Harmonics >40 dB
Nonharmonics >60 dB
Modulation characteristics
Type of modulation C3F (A5C), negative, for B/G, D/K, I, K1, M, N
C3F (A5C), positive, for L/L’
Group-delay precorrection
(max. 3 settings per multistandard
plug-in) standard B/G, ITU-R
standard B/G, ITU-R 1/2
standard B/G, Sweden (A)
standard B/G, Australia
standard D/K, ITU-R, Report 308
standard D/K, OIRT, TK-III-830
standard I, full precorrection,
South Africa
standard K1
standard M/N, FCC
full precorrection (flat)
Operating mode double-sideband modulation with or without
group-delay precorrection for IF 32 MHz to
46 MHz
or
vestigial-sideband modulation (SAW filter)
with or without group-delay precorrection for
standards B/G, D/K, I, L/L’, M, N, K1
Level control
Clamping on (to back porch);
hard or soft clamping selectable,
off
Average value for standards with
negative modulation (clamping off,
AGC off) ±50% offset
Hum suppression
in hard-clamped mode ≥57 dB (with 30% superimposed hum)
Amplitude-frequency response
Double-sideband modulation,
precorrection off
Vision carrier ±5 MHz ≤0.15 dB
±8 MHz ≤0.3 dB
Vestigial-sideband modulation
B/G 38.9 MHz IF with precorrection ≤0.5 dB (–0.6 MHz to +4.8 MHz)
D/K 38.9 MHz IF with precorrection ≤0.5 dB (–0.6 MHz to +5.8 MHz)
I 38.9 MHz IF w/o precorrection ≤0.5 dB (–1 MHz to +4.8 MHz)
L/L’ 32.7 MHz IF w/o precorrection ≤0.5 dB (–1 MHz to +5.8 MHz)
M 45.75 MHz IF with precorrection ≤0.6 dB (–0.6 MHz to +4 MHz)
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