DM-141A, DM-145, DM-145GCR, DM-154, DM-192
F
REQUENCY
AGILE DEMODULATORS
MegaHZ 800-883-8839 fax: 817-529-0745 Visit us on the Worldwide Web: w ww.megahz.com • sales@megahz.com
For more than two decades, the Videotek family of demodulators has provided the highest
performance at the best value in the indust ry. By offering the greatest selection of
demodulators, with the widest range of features, Videotek has become the largest supplier of
agile demodulators in North America. All models provide video and BTSC stereo signal
demodulation for Broadcast, CAT V and closed circuit monitoring applications. From basic
receiving and monitoring applications to full FCC proof of performance tes ting, Videotek
offers an agile demodulator that will fit your needs and your budget.
DM-192
DEMODULATOR SERIES
FEATURES
• Mul ti-band tuning (VHF/UHF/Cable)
• HRC/IRC tuning capability
• Random access, search or up/down
channel selection
• Front panel Cable/Antenna selection
• Frequency synthesized channel selection
• Front panel audio presence indicators
• Synchronous detection
• Envelope and synchronous detection on
DM-192
• Up to 4 MHz bandwidth for FCC testing
• Audio output configurations for ever y
requirement
• Front panel LED channel display
• Controls for video gain, audio gain and
balance on front panel
• Front panel memory retained for one week
in event of power loss
• All models receive and process PAL-M
• Standards available: NTSC and PAL-M
NTSC DEMODULA TOR SELECTION CHART
Model Cable Chan: Remote Video Video Audio QUAD 4.5MHz/ IF Zero Detection Diff Diff Size
(All tune Out SNR Out Out Comp Loop Carr Gain Phase
VHF/UHF) Pulse
____________________________________________________________________________________________________________________________________
DM-200
1-134 RS-232/422 2 ≥58dB Stereo/ Y Y Y Y Synchronous ≤1.0% ≤1.0˚1/2 x
SAP 1 RU
DM-200A
1-134 RS-232/422 2 ≥58dB Stereo/ N Y Y Y Synchronous ≤1.0% ≤1.0˚
1
/2 x
SAP 1 RU
DM-192 2-125 RS-232/422 2 >55dB Stereo/ Y Y Y Y Synchronous ≤4.0% ≤4.0˚ 1 RU
SAP/ /Envelope
PRO
DM-154 2-99 RS-232 2 >55dB Stereo/ Y Y Y Y Synchronous ≤4.0% ≤4.0˚ 1 RU
SAP
DM-145GCR 2-99 N 2* >49 d B Stereo/ N N N N Synchronous ≤5.0% ≤5.0˚ 1 RU
SAP
DM-145 2-99 N 2 >49dB Stereo/ N N N N Synchronous ≤5.0% ≤5.0˚ 1 RU
SAP
DM-141A 2-99 N 2 >49dB Stereo N N N N Synchronous ≤5.0% ≤5.0˚ 1 RU
DM-100 2-99 N 1 — Stereo N N N N Synchronous — —
1
/3 x
1 RU
* Only 1 video output is corrected with GCR signal
®
DM-141A
800-883-8839 fax: 817-529-0745 Visit us on the Worldwide Web: w ww.megahz.com • sales@megahz.com MegaHZ
DEMODS &
MONITORING
FEATURES:
• 154 channel tuning (VHF/UHF/Cable)
• HRC/IRC tuning capabilit y via wide
range fine t uning
• Random access, search or up/down
channel selection
• Front panel Cable/Antenna selection
• Frequency synthesized channel selection
• Synchronous detection
• Stereo presence indicator
• Front panel LED channel display
• Controls for video gain, audio gain and
balance on front panel
• Front panel memory retained for one
week in event of power loss
FEATURES:
• 154 channel tuning (VHF/UHF/Cable)
• Simultaneous stereo and SAP audio
outputs
• HRC/IRC tuning capabilit y via wide
range fine t uning
• Random access, search or up/down
channel selection
• Front panel Cable/Antenna selection
• Frequency synthesized channel selection
• Synchronous detection
• SAP and Stereo presence indicators
• Front panel LED channel display
• Controls for video gain, audio gain and
balance on front panel
• Front panel memory retained for one
week in event of power loss
FEATURES:
• One GCR corrected output
(video out #2)
• 154 channel tuning (VHF/UHF/Cable)
• Simultaneous stereo and SAP audio
outputs
• HRC/IRC tuning capabilit y via wide
range fine t uning
• Random access, search or up/down
channel selection
• Front panel Cable/Antenna selection
• Frequency synthesized channel selection
• Synchronous detection
• SAP and Stereo presence indicators
• Front panel LED channel display
• Controls for video gain, audio gain and
balance on front panel
• Front panel memory retained for one
week in event of power loss
The most af fordable model in our family, the DM-141Areceives “off-air” or CATV
signals, processes these signals and provides two buffered composite baseband video outputs.
Additionally the DM-141A provides balanced stereo audio out put s which may be monitored
via the f ront panel speaker. Ideal for uses where quality video and stereo audio reception is
required. The DM-141A is used in headends, studios and remotes for monitoring and
retransmission applications.
DM-145
Like the DM-141A, the next model in the Videotek demodulator series, the DM-145,
is perfect for broadcast and cable applications and adds the capability of providing both
stereo audio and SAP (Second Audio Program) outputs. Second language programming,
emergency alert, or radio simulcasting are a few of the applications that require full time
SAP audio.
DM-145GCR
Like the DM-145, the next model in the Videotek demodulator series, the DM-145GCR, is
perfect for broadcast applications where the added capabilit y of Ghos t Cancellation
Reference (GCR) correction to the Video output is needed. Correcting for ghosts from +3 to 42 µsec.
MegaHZ 800-883-8839 fax: 817-529-0745 Visit us on the Worldwide Web: w ww.megahz.com • sales@megahz.com
DM-154
The 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.
DM-192
The DM-192 is a 192 channel high performance agile demodulator that provides
features and performance found on demodulators over twice its price! It shares all of the
features of t he DM-154 plus front panel selectable synchronous or envelope detection and
three types of full-time audio outputs plus composite audio out. Like all Videotek agile
demodulators, the DM-192’s front panel provides convenient control of all standard
operations. The DM-192 is ideal for high qualit y reception and tes ting applications and in
any application where all audio signals are required all the time.
FEATURES
All features of the DM-141A PLUS
• Full 4 MHz bandwidth video for
compliance testing
• Quadrature output for ICPM
measurements
• SAP presence indicator
• Front panel selection of Stereo, Mono or
SAP outputs
• Zero Carrier Pulse control on front panel
• Remote control via an RS-232 por t
• IF (45.75 MHz) loop enabled by an
internal jumper
• Suitable for full FCC proof of
performance testing
FEATURES
All high performance feat ures of the
DM-154 PLUS
• 192 channel tuning (up to cable
channel 125)
• Envelope or synchronous detection
(front panel selectable)
• Full time Stereo, SAP, PRO, 4.5 MHz
and composite audio outputs
• User selectable RS-232/RS-422 port
• Designed for full FCC proof of
performance testing
®
DM-141A/145/145GCR/154/192
COMMON SPECIFICA TIONS
TUNER
TUNING RANGE:
55.25 to 801.25 MHz
CONNECTOR:
75Ω F connector, 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 s teps (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
VIDEO
VIDEO OUTPUTS:
2 NTSC video outputs, sync negative
75Ω source terminated
CONNECTORS: 75Ω BNC, female
LEVEL:
1V p-p, typical into 75Ω load
ADJUSTMENT RANGE:
±3 dB typical (front panel control)
CHROMA/LUMA DELAY:
Within 30 ns t ypical (ref -170)
AUDIO
AUDIO LINE OUTPUTS:
Balanced stereo (left and right)
CONNECTORS: XLR (male)
LEVEL: 0 dBm, t ypical 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
POWER
INPUT:
90 - 264 VAC,
50/60 Hz
CONSUMPTION:
35 VA, typical
CONNECTION:
Detachable 3 wire power cord,
per IEC 320
ENVIRONMENTAL
OPERATING TEMPERATURE:
0°to 50°C
STORAGE TEMPERATURE:
–40°to 75°C
HUMIDITY:
90% maximum (non-condensing)
MECHANICAL
DIMENSIONS:
Height: 1.75” (4.5cm)
Width: 19” (48.3cm)
Depth: 10.75” (27.3cm)
WEIGHT:
9.25 lbs. (4.2kg)
STANDARD
ACCESSORIES
Operation & Service Manual
Power Cord
Rackmount Kit
DEMODS &
MONITORING
MegaHZ 800-883-8839 fax: 817-529-0745 Visit us on the Worldwide Web: www.megahz.com Ô sales@megahz.com
Specifications subject to change without notice.
DM-141A/145/145GCR/154/192 UNIQUE SPECIFICATIONS
DM-141A/145
VIDEO
DIFFERENTIAL GAIN: <5%
DIFFERENTIAL PHASE: <5°
SIGNAL TO NOISE RATIO:
>49 dB at 0 dBmV
>55 dB at 10 dBmV
FREQUENCY RESPONSE:
0.5 MHz to 3.6 MHz ±1 dB
DM-145
ALL SPECIFICATIONS COMMON WITH
DM-141A PLUS
AUDIO LINE OUTPUTS:
Balanced stereo (left and right)
SAP Output
DM-145GCR
ALL SPECIFICATIONS COMMON WITH
DM-145 PLUS
VIDEO OUTPUTS:
2 NTSC video outputs, 1 GCR corrected
GCR VIDEO OUTPUT
FREQUENCY RESPONSE:
± 1 dB to 3.6 MHz added
DIFFERENTIAL PHASE: <2°added
DIFFERENTIAL GAIN: <3% added
SIGNAL TO NOISE RATIO: <3 dB added
ADJUSTMENT RANGE:
None (auto corrected with GCR signal)
D.C. OFSET:
< 50 mV with active GCR signal correction
< 150 mV without GCR signal correction
GHOST CANCELLATION OUTPUT:
Ghost Reduction: 35 dB, typical
Operating Range:
Leading Ghost to +3 µsec
Trailing Ghost to -42 µ sec
DM-154
ALL SPECIFICATIONS COMMON WITH
DM-141A PLUS
TUNER
IF LOOP:
+20 dBmV typical, internally enabled
CONNECTORS:
75Ω F, female
VIDEO
DIFFERENTIAL GAIN:
<4%
DIFFERENTIAL PHASE:
<4°
BANDWIDTH:
0.5 MHz to 4.0 MHz ±1 dB (Trap out)
SIGNAL TO NOISE RATIO:
>50 dB at 0 dBmV
>55 dB at 10 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°
CONNECTOR: 75Ω BNC, female
AUDIO
4.5 MHz AURAL OUTPUT:
+10 dBmV or +34 ±2dBmV selectable
CONNECTOR:
75Ω F, female
COMPOSITE AUDIO OUTPUT:
110 kHz bandwidth, 0.5V p-p
CONNECTOR:
75Ω BNC connector, female
REMOTE CONTROL
• RS-232 connector: (Type DB 9, Female)
• Cable or Antenna selection
• Channel selection select/scan up or down
• Audio mode selection
• Speaker volume control
• Zero Carrier enable and line location
• Fine tuning
• 4.5 MHz trap enable/disable
• All commands return status of
controlled feature
DM-192
ALL SPECIFICATIONS COMMON WITH
DM-154 PLUS
TUNER
CHANNEL COVERAGE:
VHF Channels 2-13
UHF Channels 14-69
Cable Channels 2-125
DETECTOR:
Synchronous or Envelope detection
Front panel selectable
SIGNAL STRENGTH METER:
Front panel indication of input RF level
AUDIO
AUDIO LINE OUTPUTS:
Balanced Stereo Left and Right
SAP, PRO channel
ADJUSTMENT RANGE: – 16 to +8 dBm
CONNECTORS: XLR (male)
4.5 MHz AURAL OUTPUT: +10 dBmV
CONNECTOR:
75Ω F connector, female
COMPOSITE AUDIO OUTPUT:
110 kHz bandwidth, 1V p-p
CONNECTOR: 75Ω BNC, female
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