12
VMA 191
Part N
o
: 9228.8x/ .9x
Audio/ Video Modulator
A/V
→
ATV (AM)
A
LINE
10. Technical data
Video input
Input voltage with AGC
0,8 … 1,3 V
pp
without AGC
1 V
pp
Impedance
75 Ω
Connector
BNC socket
Input filter (disconnectable) 5 MHz low pass
Clamping (switchable)
soft/ hard
AGC
disconnectable
Audio input
Input level
-6 ... +9 dBu
Input resistance (switchable) 0.6/ 12 kΩ
Connector
8-poles according to DIN 45326
(IEC 130-9-20)
Configuration (switchable)
balanced/ unbalanced
IF loop
Output/ input
internal jumpered or external avail-
able (switchable)
Output frequency
38.900 MHz
Input frequency
36.000, 36.125, 36.150, 38.900,
44.000, 45.750 MHz
Output/ input level
- 14 dBm (95 dBµV)
Connector
2 x BNC socket, 75 Ω
IF decoupling
≥ 80 dB
RF output
9228.82
TV standard
B/G
Sound carrier frequencies 5.5/ 5.742 MHz above pic. carrier
9228.91:
TV standard D/K
Sound carrier frequencies 6.5/ 6.25 MHz above pic. carrier
9228.92:
TV standard D/K
Sound carrier frequencies 6.5/ 5.742 MHz above pic. carrier
9228.85:
TV standard M
Sound carrier frequencies 4.5 MHz
9228.82/ .91/.92:
Sound procedure FM dual carrier processing
Sound operation modes mono/ stereo/ dual/ auto (VPS
controlled)/ external
Sound dev. 1 mono carrier 30/ 50 kHz
Sound dev. 2 mono carrier 30 kHz
Sound dev. dual tone
30 kHz
9228.85:
Sound procedure FM one carrier processing
Sound operation modes mono/ summing left-right/
auto (VPS controlled)/ external
Frequency deviation
± 25 kHz
Output frequency range
45 ... 862 MHz
Tuning step
10 kHz/ 25 kHz
*
Max. output level
14 dBm (123 dBµV)
Level adjustment range
-10 ... +14 dBm
Channel allocation
adjacent channel ability
Connector
F socket, 75 Ω
Return loss
≥ 18 dB 45 MHz
- 1.5 dB/ Octave
Test output
- 30 dB (± 1 dB)
Signal quality
Single channel intermodul. ≥ 66 dB
Noise level 3rd order
≥ 60 dB
Spurious 45 ... 862 MHz
≥ 60 dB
C/N within cannel (BW =
4,8 or 4,2 MHz in 9228.85) typ. 69 dB
C/N (> 25 MHz space from
channel center; BW = 4,8
or 4,2 MHz in 9228.85)
typ. 80 dB
Parallel sound noise ratio
unweighted/ weighted
typ. 68/ 59 dB
Max. frequency stability
± 30 kHz
Output level stability
± 0.5 dB (5 .. 45 °C)
Output level accuracy
± 1.5 dB
Amplitude frequency
response channel (8 MHz)
max. 1 dB
pp
Operation parameters
Voltage / current
100 ... 240 V ~ 50/60Hz
100 ... 353 V =
Power consumption
18 W
Environmental conditions
Temperature range
-10 ... +55 °C
Temperature range
(for data keeping)
5 ... 45 °C
Relative humidity
≤ 80 % (non condensing)
Mounting location
splash-proof
and drip-proof
Delivery content
Dimensions (w x h x d)
448 x 44 x 350 mm
Weight
4,200 g
*
25-kHz-step only with active IF loop and 36.125 MHz input frequency
9. Block diagram
Vestigial
sideband
IF modu-
lator
2x FM
modulator
+ 12 V
Video/
Audio-
Processing
Filter-
bank
IF
RF
Audio/
Video
RF
Cont
Display
—
~
Power supply
IF
IP-Control port
Test out-
put
Power
