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Videotek DM-154 Frequency Agile Demodulator
The Videotek DM-154 demodulator is a high
performance television tuner/demodulator which, in addition to being at
home in basic broadcast, cable and closed circuit monitoring applications,
can also be used for FCC compliance testing. It contains features beyond
standard tuners, including forced mono mode, a Zero Carrier Pulse
(chopper), 4.5 MHz aural carrier output, external IF loop and remote
control via an RS-232 port. The DM-154 may be used in testing applications
and in locations where computer control is required.
Features:
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154 channel tuning (VHF/UHF/Cable)
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HRC/IRC tuning capability via wide
range fine tuning
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Random access, search or up/down
channel selection
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Front panel Cable/Antenna selection
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Frequency synthesized channel selection
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Synchronous detection
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Stereo presence indicator
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Front panel LED channel display
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Controls for video gain, audio gain and
balance on front panel
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Front panel memory retained for one
week in event of power loss
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Full 4 MHz bandwidth video for
compliance testing
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Quadrature output for ICPM measurements
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SAP presence indicator
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Front panel selection of Stereo, Mono
or SAP outputs
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Zero Carrier Pulse control on front
panel
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Remote control via an RS-232 port
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IF (45.75 MHz) loop enabled by an
internal jumper
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Suitable for full FCC proof of
performance testing
Specifications:
| Tuner |
| TUNING
RANGE: |
55.25
to 801.25 MHz |
| CONNECTOR: |
"F"
75Ω, female |
| INPUT
RANGE: |
-15
to +15 dBmV |
| MAXIMUM
RF INPUT LEVEL: |
+30
dBmV |
| CROSS
MODULATION: |
<-50
dB nominal |
| FINE
TUNING RANGE: |
±2
MHz in 64 steps (62.5 kHz per step) |
| FREQUENCY
STABILITY: |
±15
kHz typical |
| CHANNEL
COVERAGE: |
VHF
Channels 2-13
UHF Channels 14-69
Cable Channels 2-99 |
| BAND
COVERAGE: |
Low,
Mid, High, Super, UHF |
| DETECTOR: |
Synchronous |
| IF
LOOP: |
+20
dBmV typical, internally enabled |
| VIDEO |
| VIDEO
OUTPUTS: |
2 NTSC video outputs, sync negative
75 source terminated |
| CONNECTORS: |
BNC
75Ω, female |
| LEVEL: |
1V
p-p, typical into 75Ω load |
| ADJUSTMENT
RANGE: |
±3
dB typical (front panel control) |
| CHROMA/LUMA
DELAY: |
Within
30 ns typical (ref -170) |
| DIFFERENTIAL
PHASE: |
<4° |
| FREQUENCY
RESPONSE: |
0.5
MHz to 3.6 MHz ±1 dB |
| DIFFERENTIAL
GAIN: |
<4% |
| BANDWIDTH: |
0.5
MHz to 4.0 MHz ±1 dB (Trap out) |
| SIGNAL
TO NOISE RATIO: |
>50
dB at 0 dBmV |
| ZERO
CARRIER OUTPUT: |
User selection ON/OFF; Location of
Zero Carrier Pulse selectable from line 10 through line 25 via front
panel |
| QUADRATURE
OUTPUT: |
within
7° |
| AUDIO |
| AUDIO
LINE OUTPUTS: |
Balanced
stereo (left and right) |
| CONNECTOR: |
"F" 75Ω, female |
| LEVEL: |
0
dBm, typical across 600Ω |
| ADJUSTMENT
RANGE: |
-16
dBm to +4 dBm |
| FREQUENCY
RESPONSE: |
50
Hz to 12 kHz (stereo mode) |
| SIGNAL
TO NOISE RATIO: |
50
dB at 0 dBm |
| STEREO
SEPARATION: |
>20
dB @ 1 kHz |
| DISTORTION: |
2%
maximum, 1 kHz to 12 kHz |
| AUDIO
SPEAKER: |
Internal
1" speaker, front panel level control |
| 4.5
MHz AURAL OUTPUT: |
+10
dBmV or +34 ±2dBmV selectable |
| COMPOSITE
AUDIO OUTPUT: |
110
kHz bandwidth, 0.5V p-p |
| CONNECTOR: |
BNC
75Ω, female |
| POWER |
| INPUT: |
90
- 264 VAC, 50/60 Hz |
| CONSUMPTION: |
35
VA, typical |
| CONNECTION: |
Detachable
3 wire power cord, per IEC 320 |
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