The TVPM-01 TV Power Monitor is designed to separate the visual carrier from the aural carrier at the output of a transmitter and develop DC voltages proportional to the transmitted power. It also contains visual and aural demodulators necessary to verify the quality of the signal being transmitted. The visual demodulator is of the synchronous, high performance type to allow the evaluation of the amplitude vs frequency and transient responses of the transmitted visual signal as well as the color sub-carrier differential gain and phase.
The power monitor is designed to be fed from a directional coupler or an "RF Sniffer" on a transmission line. The detector is linear over a 20 dB range and will give accurate indications in case of power changes. This information can be used to feed the Davicom MAC remote monitoring & control unit.
On site, visual percentage of demodulation can be measured with the built-in zero carrier reference pulse inserted in the vertical interval of the video. A bar graph peak level meter is also available for the measurement of the audio percentage of modulation.
The audio and video outputs from the monitor can also be used to feed audio and video presence detectors such as the Scientel
Dual Audio Presence Detector (DAPD) and
Dual Video Presence Detector (DVPD), generating a DC voltage proportional to the peak level of the audio and video signals and alarm indications if the audio or video levels drop below user programmable thresholds.
Flat or compensated group delay versions:
This product can be ordered in two different versions. The TVPM-01 has a flat group delay demodulator, while the TVPM-01GD has a chrominance group delay receiver equalizer demodulator. Please refer to our
Technical Bulletin.
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ELECTRICAL SPECIFICATIONS |
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Power Requirements |
+12 VDC Regulated, 300 mA
-12VDC Regulated, 250 mA
+5VDC Regulated, 300 mA |
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Input Attenuator |
1 dB, 2dB, 4dB, 8dB. Total 15dB on Front Panel |
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Input Impedance |
50 Ω |
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Input VSWR |
1.2 : 1 |
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Input Sensitivity |
-16dBm ± 3dB with RF Attenuator Out and IF Attenuator to Maximum Level |
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IF Level Range |
7dB Adjustable from Front Panel |
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Frequency Programming |
16 DIP Switches on Front Panel |
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Audio Output (mono) |
Adjustable from Front Panel, 0 to 10dBm, 600 Ω Balanced |
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Audio Muting |
ON when Transmitter Power drops by more than 20dB |
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Audio Distortion |
Less than 0.9% |
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De-Emphasis |
75 µs Standard 50Hz to 15kHz |
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Audio % Modulation Indicator |
LED Bar Graph (7 Green, 3 Red) |
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DC Output |
0 to 7.5VDC Linear, set at 5VDC for Normal Transmitter Power |
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Alarm Contacts Out |
SPDT Adjustable Comparator to Signal and Alarm at the desired Transmitter Power Loss |
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Video % Modulation Indicator |
Keying Pulse in Vertical Interval |
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Video Frequency Response |
±0.5dB from 0.2MHz to 4.0MHz, 3dB Down at 4.1MHz |
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Video "K" Rating |
1% for 2T Pulse |
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Group Delay |
±20ns, 0.2 to 4.1 MHz |
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Differential Gain |
1% max. |
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Differential-Phase |
1 Degree max. |
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MECHANICAL SPECIFICATIONS |
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Operating Temperature |
+32°F to 122°F
0°C to +50°C |
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Dimensions |
1 5/8 x 8 1/2 x 12 in (H x W x D)
4.1 x 10.8 x 30.5 cm |
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Input Connector |
BNC Female |
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Audio Outputs |
Front Panel Audio 3 Way Jacks and Rear Connectors |
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Rear Output Connector |
Weidmuller Terminal Block |
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Video Output |
BNC Connector on Front Panel and Rear Panel |
Product ordering code: TVPM-01/TVPM-01GD
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