Features
& Benefits
- Full 850 MHz Span for International Satellites
- L-Band
and 70 MHz IF Inputs
- Designed for Satellite News Gathering
- Easy,
Reliable Operation
- Cost-effective
- On-screen Ku- or C-band
Frequency Readout
- On-screen Setup Menu
- Selectable 2 dB/div
or 10 dB/div Sensitivity
- Resolution Bandwidth Switchable to 10 kHz
or 300 kHz
- Span Range and Video Filter Selection
- Bright,
Clear Display
Applications
- Identification
of Satellites/Transponders in OB Vans
- Monitor Satellite Spectrum
at Downlink Facilities
1705A menu flow.
The
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 subcarrier 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.
Compact
Size
The 1705A is unique in size, shape and utility. 8.5 in. (215.9 mm)
wide and 5.25 in. (133.4 mm) high, it fits into a standard Tektronix dual
half-rack WFM7F05 Option OO cabinet, along with a matching 1700 Series waveform,
vector or combination monitor.
Microprocessor Control
A menu
selected readout offset allows on-screen indication of the Ku-band or C-band
satellite operating frequency in steps of 10 MHz. The offset may be set for
local oscillators operating above or below the received signal. The status
of all front panel buttons is stored when power is removed and all modes are
restored on power-up, ready for quick operation. Function indicators are lighted
for visibility in television operating environments.
RF Spectrum Display
Span
per division, resolution bandwidth and display video bandwidth may be selected
for full satellite, transponder or discrete carrier display. The band of interest
is highlighted in the full span mode, with frequency indicated as an alphanumeric
readout. In 10 MHz, 1 MHz and 100 kHz span/div modes, the readout indicates
the frequency of the spectrum displayed directly under the cursor.
A
CENTER FREQUENCY control marks the display in full span and moves the spectral
view through the entire selected band in narrower spans.
1705A Rear Panel.
Bright,
Full Size CRT Display
The signal is displayed on a bright, mesh type
CRT with internal graticule to eliminate parallax. Variable graticule illumination
improves readability under difficult conditions. The display is a full 8x10 cm
and the bezel accepts camera and viewing hood options designed for Tektronix
1700 Series monitors.
Designed for Rugged Use
The 1705A spectrum
monitor is designed to provide reliable operation in portable news gathering
applications. The 1705A is built to withstand extremes of temperature, altitude
and vibration. Its small size provides a freedom of system design critical
in the rapidly changing television news environment.
Characteristics
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.
Altitude
-
Nonoperating: To 15,240 m (50,000 ft.).
Operating: To 4,572 m
(15,000 ft.).
Shock - Nonoperating: 30 gs, 1/2 sine, 11 ms
duration, 3 shocks per surface (18 total).
Vibration - Operating:
15 minutes each axis at 0.015 in. (frequency varied from cycles with instrument
secured to vibration platform) 10 minutes each axis at any resonant point
or at 55 Hz if no resonant point is found.
Transportation - Qualified
under NSTC Test Procedure 1A, Category II (30 in. drop).
Certifications
EMC
- Certified to the EMC Directive 89/336/EEC.
Safety -
Approved
to: UL1244, CSA231.
Complies with: EN61010-1, IEC61010-1.
Physical
Characteristics
|
Dimensions
|
mm
|
in.
|
|
Weight
|
kg
|
lbs.
|
|
Height
|
133.4
|
5.25
|
|
Width
|
215.9
|
8.5
|
|
Depth
|
460.4
|
18.1
|
|
Approximately
|
3.8
|
8.5
|
Ordering
Information
1705A
Spectrum Monitor.
When ordering,
please use the nomenclature given here. The standard instrument is shipped
without a case or handle. If your application is for bench or portable use,
please order the appropriate enclosure from the optional accessories list.
The 1705A is a UL-recognized component and meets the requirements for listing
when used in the appropriate enclosure.
Includes: Instruction
manual, adapter, F-type male connector to BNC female connector, power cord
(with correct plug for the selected power plug option). Please specify power
plug when ordering
1705A Options
Opt. 74 - Substitutes
white phosphor CRT.
Power Plug Options
Opt. A0
- US Plug, 115 V, 60 Hz.
Opt. A1 - Euro Plug, 220 V, 50
Hz.
Opt. A2 - UK Plug, 240 V, 50 Hz.
Opt. A3 - Australian
Plug, 240 V, 50 Hz.
Opt. A5 - Swiss Plug, 220 V, 50 Hz.
Opt.
AC - China Plug, 50 Hz.
Opt. A99 - No Power Cord.
Optional
Accessories
1700F00 - Plain Cabinet.
1700F02
- Portable Cabinet.
WFM7F05 Option OO - Rack Adapter.
1700F06
- Blank Panel.
1700F07 - Utility Drawer.
016–0475–00
- Viewing Hood.
200-3897-01 - Front Panel Cover.
Support
Options
Contact your local Tektronix representative.
|
|
Product(s) are manufactured in ISO registered facilities.
|
24W-07134-1a, 01-DEC-2002
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