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Videotek DM-200A High-Performance Frequency Agile NTSC Demodulator
Representing over a quarter century of
continuous commitment to meeting the requirements of the most demanding
video RF engineers, Videotek offers the DM-200A high-performance
demodulator. With a signal-to-noise figure better than 58 dB, the DM-200
series is ready to take charge at your laboratory bench, cable headend
rack or broadcast facility. For use when you are performing FCC
compliance testing, monitoring or recording offair signals, or
rebroadcasting to your cable plant.
Features:
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Full FCC 4.1 MHz bandwidth video for
compliance testing
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Better than 58 dB Video SNR
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Differential gain: ≤1.0%
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Differential phase: ≤1.0°
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Multi-band tuning: VHF/UHF/Cable with
HRC/IRC offset capability
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Proprietary high-performance SAW filter
ensures optimal performance
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Simultaneous BTSC stereo and SAP
outputs with LED presence indicators
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4.5 MHz and composite audio outputs
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IF (45.75 MHz) loop enables use of
external decoders
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Zero Carrier Pulse control allows depth
of modulation measurements
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Synchronous detection
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Remote control via user-selectable
RS-232/422/485 port
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Standards available: NTSC and PAL-M
Specifications:
| TUNER |
| TUNING
RANGE: |
55.25
to 860.00 MHz |
| CONNECTOR: |
"F",
75Ω female |
| INPUT
RANGE: |
-10
to +25 dBmV |
| MAXIMUM
RF INPUT LEVEL: |
+30
dBmV |
| FINE
TUNING RANGE: |
±2
MHz in 64 steps |
| FREQUENCY
STABILITY: |
±60
kHz typical |
| CHANNEL
COVERAGE: |
VHF Channels 2-13
UHF Channels 14-69
Cable Channels 1-134 |
| BAND
COVERAGE: |
Low,
Mid, High, Super |
| DETECTOR: |
Synchronous |
| IF
LOOP: |
+38
dBmV ±2 dBmV |
| VIDEO |
| VIDEO
OUTPUTS: |
Two
NTSC video outputs with negative sync and DC restoration |
| CONNECTORS: |
BNC
75Ω, source terminated |
| LEVEL: |
1V
p-p, typical into 75Ω load |
| ADJUSTMENT
RANGE: |
±3
dB, minimum (front-panel control) |
| DIFFERENTIAL
GAIN: |
≤1.0% |
| DIFFERENTIAL
PHASE: |
≤1.0° |
| FREQUENCY
RESPONSE: |
Up
to 3.58 MHz ±0.6 dB (trap in)
Up to 4.1 MHz ±0.6 dB (trap out) |
| CHROMA/LUMA
DELAY: |
±30
ns (referenced -170 ns)
(w/perfect modulator) (trap in) |
| SIGNAL
TO NOISE RATIO: |
≥58
dB @ +14 dBmV input level |
| ZERO
CARRIER OUTPUT: |
User
selection ON/OFF; Location of Zero Carrier Pulse front panel
selectable from line 10 through line 25 |
| CONNECTOR: |
BNC
75Ω, female |
| AUDIO |
| AUDIO
LINE OUTPUTS: |
Balanced
stereo left and right and SAP (source terminated) |
| CONNECTORS: |
Push-on
pin connectors |
| LEVEL: |
0
dBm ±1 dB typical across 600Ω |
| ADJUSTMENT
RANGE: |
-16
dBm to +4 dBm |
| FREQUENCY
RESPONSE: |
50
Hz to 12 kHz (stereo mode) ±0.5 dB |
| STEREO
SEPARATION: |
>30
dB from 50 Hz to 10 kHz |
| TOTAL
HARMONIC DISTORTION (THD): |
0.5%
maximum, 1 kHz to 12 kHz |
| SIGNAL
TO NOISE RATIO: |
≥60
dB |
| MONITOR: |
Audio
jack; front panel level control |
| AUDIO
JACK IMPEDANCE: |
>16Ω
level -25dBm Nominal, Adj.
Range ±15dB |
| 4.5
MHZ OUTPUT: |
+42
dBmV limited ±2 dB |
| COMPOSITE
AUDIO OUTPUT: |
0.5V
p-p terminated 75Ω;
bandwidth 110 kHz ±1dB |
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