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{{Oscilloscope Sidebar |
{{Instrument Sidebar  
title=Tektronix 1705A |
|manufacturer=Tektronix
summary=Spectrum Monitor 45 MHz to 100 MHz, and 950 MHz to 1.8 GHz |
|model=1705A  
image= Tek_1705a_front.jpg |
|class=Spectrum Analyzer
caption=Tektronix 1705A |
|summary=Spectrum Monitor
introduced=1988 |
|image= Tek_1705a_front.jpg  
discontinued=2000+ |
|caption=Tektronix 1705A  
manuals=
|introduced=1988  
Need Service Manual
|discontinued=2000+  
* [[Media:070-8222-08.pdf| Tektronix 1705A Instruction Manual (PDF)]]
|manuals=
* [[Media:070-8222-08.pdf| Tektronix 1705A Instruction Manual]]
* [[Media:Tek_1705_Catalog_1988.pdf| Tektronix 1705 Introduction Spec]] (OCR)
* [[Media:Tek_1705A_Catalog_1993.pdf| Tektronix 1705A Introduction Spec]] (OCR)
* ''Service Manual needed''  [[Category:Manual needed]]
}}
}}
The '''Tektronix 1705A''' is a spectrum monitor designed primarily for locating Ku or C-Band satellites and monitoring their signals.


The '''Tektronix 1705A''' is a spectrum monitor designed primarily for locating Ku or C-Band satellites and monitoring their signals with a 3 X 4 in. (80 X 100 mm) monochrome CRT display.  It operates by using LNB down converters to the L-Band (950 MHz to 1.8 GHz), and monitoring up link transmissions utilizing an Upconverter to the 70 MHz IF (45 MHz to 100 MHz).  The resolution bandwidths 10 kHz and 300 kHz provides measurement resolution proportional to the frequency accuracy or span.
It operates by using LNB down converters to the L-Band (950 MHz to 1.8 GHz), and monitoring up link transmissions utilizing an upconverter to the 70 MHz IF (45 MHz to 100 MHz).  The resolution bandwidths 10 kHz and 300 kHz provides measurement resolution proportional to the frequency accuracy or span.


The CRT has a graticule that can be lit up or not depending on the internal jumper position.  With non-volatile memory (NVRAM) you can save the current front-panel switch settings, at power down, so that the 1705A can come back with the last front-panel setup.  The user interface has on-screen frequency readout, as well as, setup menus.  The L-Band readout may be reconfigured to display a satellite frequency in the range of 0.9 GHz to 20 GHz.
The CRT graticule can be lit by setting an internal jumper.  The front-panel switch settings can be saved to NVRAM.  The user interface has on-screen frequency readout as well as setup menus.  The L-Band readout may be reconfigured to display a satellite frequency in the range of 0.9 GHz to 20 GHz.


Rear panel inputs/outputs are: L-BAND INPUT [[F-Type connector]] (Female connector used for the 900 – 2000 MHz input of the L-Band rf, which is down converted by a Low-Noise Amplifier/Block Down Converted (LNB) from the received satellite signal; The LNB POWER switch enables or disables an 18 V supply for the Block Down Converted through the L-BAND INPUT connector); 70 MHz INPUT [[BNC connector]] (Female connector used for the input of the 45MHz – 100 MHz rf).
---------------------------------------------------------
<div style='text-align: center;'>Specifications based on 2000 published documentation, unless otherwise specified.</div>
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Frequency Ranges | L-Band:950 MHz to 1.8 GHz; 70 MHz band: 45 MHz to 100 MHz }}
{{Spec | Frequency | L-Band: 950 MHz to 1.8 GHz; 70 MHz band: 45 MHz to 100 MHz }}
{{Spec | Frequency Span Ranges | L-Band: Full, 10 MHz/div, 1 MHz/div, and 10 kHz/div; 70 MHz: Full, 1 MHz/div, and 100 kHz/div }}
{{Spec | Frequency Span | L-Band: Full, 10 MHz/div, 1 MHz/div, and 10 kHz/div; 70 MHz: Full, 1 MHz/div, and 100 kHz/div }}
{{Spec | Resolution Bandwidth Range | -6 dB bandwidth selections are 300 kHz, and 10 kHz }}
{{Spec | Resolution Bandwidth | –6 dB bandwidth selections 300 kHz / 10 kHz }}
{{Spec | RF Input impedance | 75 Ω }}
{{Spec | RF Input | 75 Ω }}
{{Spec | Maximum Safe Input Power | L-Band: -30 dBm; 70 MHz: -20 dBm }}
{{Spec | Maximum Safe Input Power | L-Band: –30 dBm; 70 MHz: –20 dBm }}
{{Spec | Minimum Signal Input | -80 dBm }}
{{Spec | Minimum Signal Input | –80 dBm }}
{{Spec | Video Filter | Reduces Video Bandwidth to ≈ 10 kHz }}
{{Spec | Video Filter | Reduces Video Bandwidth to ≈ 10 kHz }}
{{Spec | RF Attenuator Range | No built-in internal attenuation.  Apply an external attenuator to keep the maximum safe input power below the rating listed above }}
{{Spec | RF Attenuator Range | No built-in internal attenuation.  Apply an external attenuator to keep the maximum safe input power below the rating listed above }}
{{Spec | Sweep Speed Range | 20 ms to 200ms, variable }}
{{Spec | Sweep Speed | 20 ms to 200 ms, variable }}
 
{{Spec | Display | 80 mm × 100 mm (3" × 4") CRT, P31 (Opt. 74: White Phosphor) }}
{{Spec | Displayed Frequencies in FULL Span/Div |  
* L-Band: Left Grat. Edge = 900 MHz; Mid Grat. Line = 100 MHz; Right Grat. Edge = 1900 MHz;
* 70 MHz: Left Grat. Edge = 45 MHz; Mid Grat. Line = 70 MHz; Right Grat. Edge = 95 MHz }}
 
{{Spec |TEST - TO BE FINISHED LATER TODAY |
* Coaxial Input Bands: 100 kHz to 40 GHz;
* External Waveguide mixer: Extended to 325 GHz }}
 
{{Spec | Included Accessories | Instruction Manual; F-type Male Connector to BNC Female Connector Adapter; and Power Cord }}
{{Spec | Weight | Standard accessories: 3.8 kg (8.5 lbs) }}
{{Spec | Weight | Standard accessories: 3.8 kg (8.5 lbs) }}
{{Spec | Power | 90 − 250 V<sub>AC</sub>, 48 to 66 Hz, 35 W }}
{{Spec | Power | 90 − 250 V<sub>AC</sub>, 48 to 66 Hz, 35 W }}
{{Spec | Operating Atmospherics | Temperatures: 0 °C to +50 °C;  Humidity: 95% for five days; Altitude: Up to 4.8 km (15,000 ft) }}
{{EndSpecs}}
{{EndSpecs}}


==Options==
Rear panel:
* Opt. 74: White CRT Phosphor
* L-BAND INPUT, [[F connector]]: 900 – 2000 MHz down-converted from L-Band RF by a low-noise block converter (LNB)
* 1700F00: Plain Cabinet
* LNB POWER switch enables or disables an 18 V supply for the LNB at the L-band input
* 1700F02: Carrying Case
* 70 MHz INPUT [[BNC connector]] (for 45 MHz – 100 MHz RF)
* WFM7F05: Side-by-Side Rack Adapter
* 1700F06: Blank Panel
* 1700F07: Utility Drawer


==Pictures==
==Pictures==
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Tek_1705A_08.jpg
Tek_1705A_08.jpg
Tek_1705A_09.jpg
Tek_1705A_09.jpg
</gallery>
</gallery>


[[Category: Spectrum Analyzers]]
[[Category:Spectrum analyzers]]

Latest revision as of 23:03, 26 March 2024

Tektronix 1705A
Spectrum Monitor
Tektronix 1705A

Produced from 1988 to 2000+

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 1705A is a spectrum monitor designed primarily for locating Ku or C-Band satellites and monitoring their signals.

It operates by using LNB down converters to the L-Band (950 MHz to 1.8 GHz), and monitoring up link transmissions utilizing an upconverter to the 70 MHz IF (45 MHz to 100 MHz). The resolution bandwidths 10 kHz and 300 kHz provides measurement resolution proportional to the frequency accuracy or span.

The CRT graticule can be lit by setting an internal jumper. The front-panel switch settings can be saved to NVRAM. The user interface has on-screen frequency readout as well as setup menus. The L-Band readout may be reconfigured to display a satellite frequency in the range of 0.9 GHz to 20 GHz.

Key Specifications

Frequency L-Band: 950 MHz to 1.8 GHz; 70 MHz band: 45 MHz to 100 MHz
Frequency Span L-Band: Full, 10 MHz/div, 1 MHz/div, and 10 kHz/div; 70 MHz: Full, 1 MHz/div, and 100 kHz/div
Resolution Bandwidth –6 dB bandwidth selections 300 kHz / 10 kHz
RF Input 75 Ω
Maximum Safe Input Power L-Band: –30 dBm; 70 MHz: –20 dBm
Minimum Signal Input –80 dBm
Video Filter Reduces Video Bandwidth to ≈ 10 kHz
RF Attenuator Range No built-in internal attenuation. Apply an external attenuator to keep the maximum safe input power below the rating listed above
Sweep Speed 20 ms to 200 ms, variable
Display 80 mm × 100 mm (3" × 4") CRT, P31 (Opt. 74: White Phosphor)
Weight Standard accessories: 3.8 kg (8.5 lbs)
Power 90 − 250 VAC, 48 to 66 Hz, 35 W

Rear panel:

  • L-BAND INPUT, F connector: 900 – 2000 MHz down-converted from L-Band RF by a low-noise block converter (LNB)
  • LNB POWER switch enables or disables an 18 V supply for the LNB at the L-band input
  • 70 MHz INPUT BNC connector (for 45 MHz – 100 MHz RF)

Pictures

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