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TEKTRONIX 1705A Spectrum Monitor
- Stock: Out Of Stock
- Code: BS16313
- Model: 1705A
Tektronix 1705A is a compact, specialized spectrum monitor designed for operators of portable television earth stations to adjust transmission equipment and to correctly access geostationary satellites operated by public and private communications organizations. The 1705A offers expanded capabilities for observing the 850 MHz wide frequency band used by international satellite carriers.
Dual Band Operation
Separate signal inputs allow connection to the two primary signals of interest in a television uplink/downlink system. A 45-100 MHz band allows observation of the television exciter at the 70 MHz IF monitoring point for a check of video deviation and aural sub carrier injection. A 950-1800 MHz band, with a separate RF input, allows observation of the full satellite downlink spectrum as down converted by the antenna-mounted, low-noise block down converter (not supplied). The input levels available in typical satellite television systems match the input sensitivity of the 1705A without need for operator adjustable input attenuators.
In addition to a span of the full spectrum in each band, the 1705A allows a selection of narrow spans and resolution filters for observation of individual satellite transponders, the video FM modulation envelope, or associated audio carriers.
Using the 1705A, the operator can quickly identify the assigned satellite and transponder and correctly adjust the direction and polarization of the portable uplink/downlink antenna. Precise antenna pointing is facilitated by a selectable 2 dB or 10 dB per major division vertical screen sensitivity with vertical position control.
Technical Details
Frequency Range -
L-Band: 900-2000 MHz (F-type connector), with performance specified over a range of 950-1800 MHz. 70 MHz: 45-100 MHz (BNC type connector).
Frequency Span -
L-Band: Full (900-2000 MHz with 1000 MHz on screen), 10 MHz/div., 1 MHz/div., 100 kHz/div.
70 MHz: Full (45-100 MHz with 50 MHz on-screen), 1 MHz/div., 100 kHz/div.
Frequency Readout - Alphanumeric on-screen display with center frequency marker. Offset may be adjusted to read satellite frequency in range of 0.9 GHz to 20.0 GHz.
Readout Accuracy - ±10 MHz.
Frequency Marker -
Full Span: Bright up marker at indicated frequency. Marked frequency will be on screen in next narrower span.
MHz/div. Spans: Selected center frequency indicated by caret marker.
Span/Div Accuracy -
L-Band: Full span typically 0.5 minor division.
70 MHz: Full span typically 1.0 minor division.
Relative Amplitude Accuracy - Typically ±1 dB/100 MHz over L-Band frequency range of 950-1800 MHz.
Display Sensitivity - Nominally 10 dB or 2 dB/div.
Flatness - L-Band (950-1800 MHz) ±5 dB; 70 MHz (45-100 MHz) ±2 dB.
Positioning Range -
Vertical: ±3 divisions.
Horizontal: ±2 divisions.
Resolution Bandwidth - Filter Bandwidth: 6 dB down 10 kHz or 300 kHz.
Maximum Input Signal Level -
L-Band: -30 dBm, 75 Ω.
70 MHz: -20 dBm, 75 Ω.
Video Filter - Reduces display video bandwidth to approximately 10 kHz.
Low Noise Blockconverter (LNB) DC Supply - +18 V DC ±5%, 250 mA max output through L-Band input connector, switched on/off by rear panel slide switch LED indicator on rear panel.
CRT Display
CRT Viewing Area - 80x100 mm.
Accelerating Potential - 13.75 kV.
Trace Rotation Range - >±1 degree from horizontal. Total range typically 8 degrees.
Graticule - Internal, 8x10 division spectrum monitor graticule with variable scale illumination.
Power Source
Mains Voltage Ranges -
110 V: 90-132 V, 100-132 V with LNB supply switched on.
220 V: 180-250 V, 200-250 V with LNB supply switched on.
Mains Frequency Range - 48 Hz to 66 Hz.
Power Consumption - 25 W, 35 W maximum with LNB supply switched on.
Environmental
Temperature -
Nonoperating: -55°C to +75°C.
Operating: 0°C to +50°C.
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