Tektronix TV1350 Television Demodulator
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Features
- Continuously Tunable Over All TV Bands and CATV Channels (HRC and IRC) to 880 MHz (Channels 2-99)
- Automatic Compensation for Carrier Offsets to ±100 kHz
- Switch Selectable Sound Trap
- Switchable IF Gain for Improved S/N Ratio
- Selectable Envelope or Synchronous Detection
- Synchronous Detector Quadrature Output
- Stable Zero Carrier Reference for Video Level Adjustments and Residual Carrier Measurements
- Parallel Remote Control Interface and IEEE-488 (GPIB) Option Included
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Available Stock Items and Accessory Choices
Description
The TV1350 family is capable of solving all problems in the field of TV reception and demodulation.
The Tektronix TV1350 Television Demodulator provides an accurate link between RF signals and baseband measuring equipment. It captures and demodulates TV signals with true fidelity and full transparency and is ideal for monitoring testing and adjustment applications in both TV transmitter and CATV systems.
Synthesizer frequency processing provides continuous coverage of all TV bands and cable channels. Channel selection is simply a matter of entering the channel number manually from the front panel or via the remote interface. A search mode facilitates automatic tuning. Accuracy is < 2.5 kHz and carrier offsets to ±100 kHz are compensated automatically.
Up to 20 dB of built-in RF attenuation is selectable, either manually or automatically. The RF input level is indicated on an analog meter, with the optimal input level marked directly on the meter. Highly effective adjacent channel suppression is provided by a SAW filter.
The TV1350 offers user-selectable envelope or synchronous detection. Two isolated video outputs and two quadrature signal outputs facilitate convenient measurement of incidental phase modulation of the video carrier to determine the intercarrier S/N ratio of the sound channel. The quadrature signal output is especially suited for adjustment of linearity and phase equalizing circuits in TV transmitters. A stable zero carrier reference enables accurate measurement of the video modulation depth.
Frequency deviation of the sound carrier can be measured on the front panel analog meter. Narrow, wideband, mono and stereo BTSC audio outputs are available. Complex audio processing circuits maintain equal deviation of the two audio demodulators to ensure low stereo crosstalk. A built-in loudspeaker with a volume control and a headphone jack provide convenient monitoring of the audio signal. Parallel remote control capability is standard. An IEEE-488 (GPIB) bus interface is optional.
Key Features Common to the TV1350 Products Are:
Two isolated video outputs
Two quadrature outputs for ICPM measurements
Zero carrier reference pulse
Switchover from synchronous to envelope detection
Channel selection with digital entry of channel number either in manual or in remote mode
Automatic control of frequency offset up to ±100 kHz
Continuously tunable in all TV bands, also in special channels from 54 MHz to 880 MHz
SAW filter switch-selected on front panel for adjacent channel suppression
Optional GPIB control (IEC 625-1/IEEE 488), thus channel selection also possible by entering the vision carrier frequency
Reduction of IF gain allowing operation at high input levels (demodulator mode) and thus providing increased video S/N ratio.
Product Family: TV1350, TV-1350, TV 1350, 1350
Technical Specifications
| Frequency Range | Bands I, II, III, IV/V, cable channels from 54
to 880 MHz for HRC or IRC, 38.9 MHz and
45.75 MHz IF
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| Channel Selection | Manual or remote entry of channel number,
automatic search or IEEE-488 bus.
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| Frequency Processing | By synthesizer
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| Frequency Error | ≤ ±2.5 kHz
≤ ±30 kHz (AFC)
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| Inputs
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| RF | Type N female, 50 Ohm
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| RF | BNC female, 50 and 75 Ohm
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| IF | BNC female
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| Input Voltage Range
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| RF | .25 to 30 mV
.5 to 100 mV, switchable
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| IF | 5 to 100 mV
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| Return Loss
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| IF | >20 dB
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| 50 Ohm, RF | >12 dB, <300 MHz;
>10 dB, >300 MHz
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| 75 Ohm, RF | >8 dB
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| RF Input Attenuation | 0/10/20 dB, automatic or
manual adjustment
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| Noise Figure | <9 dB, VHF; <12 dB, UHF
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| Video Channel
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| Non-Linearity | ≤ 2% differential gain,
≤ 2° differential phase,
10 to 75% modulation depth, synchronous detection
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| Chrominance / Luminance Delay | ≤ ±20 ns (via IF input 1)
≤ ±25 ns (w/o SAW filter). Additional ripple of SAW filter
≤ ±50 ns
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| Tilt (50 Hz) | ≤ 0.5%
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| Gain Control | Automatic or manual,
> 34 dB dynamic range,
typ. 40 dB,
plus 2 x 10 dB input attenuation for TV1350
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| Audio Channel
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| Intercarrier Frequency | 4.5 MHz
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| Intercarrier S/N | ≥ 46 dB 0-4 MHz, sine modulation;
≥ 52 dB without vision modulation
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| Frequency Response | ≤ ±0.5 dB flatness, referred to 50 µs de-emphasis
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| Harmonic Distortion | ≤ 1%, typ. 0.5%, at ±50 kHz deviation and 5 kHz modulation frequency
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| Stereo Crosstalk | Down ≥ 36 dB
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| Channel Crosstalk | Down ≥ 70 dB
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| Outputs
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| Video In-phase | 1 Vp-p, CVS with standard modulation;
75 Ohm;
BNC front and rear panel connectors
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| Video Quadrature | 1 Vp-p with standard modulation and 90° phase shift of switching carrier;
75 Ohm;
BNC front and rear panel connectors
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| IF Output | 200 mV rms ±3 dB;
50 Ohm;
BNC rear panel connector
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| Audio Output | +6 dBm ±0.5 dB, with ±30 kHz deviation and 500 Hz modulation frequency
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| Front Panel Indication
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| Analog Meter | Input level with marking of optimal level range; deviation of sound (50 kHz and 100 kHz fsd); marker for correct video output level
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| LEDs | Selected channel, no video carrier, no sound carrier, no pilot and stereo
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| Zero Reference Pulse | For checking of residual carrier, field-repetitive, can be enabled in lines 15 to 328 (factory-set) of field blanking interval or triggered by external pulse
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| Error Referred to CVS in Case of Synchronous Detection | ≤ 1.5%
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| Loudspeaker | Front panel volume control
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| Power Supply | 110/120/220/240 V AC ±10%, 47-63 Hz
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| Temperature Rated | +40°F to +115°F (+5°C to +46°C).
Operating: +32°F to +115°F (0°C to +46°C).
Nonoperating: -40°F to +158°F (-40°C to +70°C) |
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