494

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Tektronix 494
21 GHz Spectrum Analyzer
Tektronix 494

Produced from 1985 to 1989

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 494 is a spectrum analyzer with a frequency range of 10 kHz to 21 GHz in coax, and up to 325 GHz with external waveguide mixers. The P suffix designation indicates GPIB Programmability.

In 1988, the 494A /494AP successor model was introduced.

Key Specifications

Frequency Range
  • 10 kHz to 1.8 GHz
  • 1.7 GHz to 5.5 GHz
  • 3 GHz to 7.1 GHz
  • 5.4 GHz to 18 GHz
  • 15 GHz to 21 GHz
  • External Waveguide mixers: 18 GHz to 325 GHz
Frequency Span 50 Hz/Div to 500 MHz/Div in 1–2–5 sequence, plus 0 Hz and MAX
Resolution Bandwidth 30 Hz, then 100 Hz to 1 MHz in decade steps (-6 dB)
RF Input 50 Ω, max. +30 dBm (1 W) CW or 75 W peak pulse (1 µs, 0.1% duty factor)
RF Attenuator 0 dB to 60 dB, 10 dB steps
Reference Level –117 dBm to +40 dBm
Sweep Speed 10 sec/div to 20 µs/div in 1, 2, 5 sequence
Video Bandwidth Filter Normal, Wide: 1/30, or Narrow: 1/300 of resolution bandwidth
Triggering Modes Free Run, Line, Video, Single, External
Display Dynamic Range 80 dB
Calibrator (Cal out) 50 Ω, –20 dBm ±0.3 dB at 100 MHz
Weight 24 kg (52 lbs) with standard accessories
Power 90 − 132 VAC, 48 to 440 Hz; 180 – 250 VAC, 48 to 440 Hz, 210 W max
Operating Environment –15 °C to +55 °C, Humidity: Five cycles (120 hours) MIL-STD-810; Altitude: Up to 4.6 km (15,000 ft)

Options

  • Opt. 08: Delete external Mixer capability
  • Opt. 12: Help mode text in English + German
  • Opt. 13: Help mode text in English + French
  • Opt. 14: Help mode text in English + Spanish
  • Opt. 20: General Purpose 12.4-40 GHz Waveguide Mixer Set
  • Opt. 21: High performance 18 to 40 GHz WM490 Series Waveguide Mixer Set
  • Opt. 22: Same as Opt. 21 plus WM490U (40-60 GHz) Waveguide Mixer
  • Opt. 30: Rackmount with front panel I/O
  • Opt. 31: Rackmount with rear panel I/O
  • Opt. 32: Benchmount
  • Opt. 41: Digital Microwave Radio Measurement Enhancement package: Provides wider bandwidth preselector, 30Hz video filter with 100 kHz resolution bandwidth and a 5 MHz/Div span.
  • Opt. 42: Replaces MARKER/VIDEO input port on the rear panel with a 110 MHz IF output port that provides a 6 dB signal bandwidth ≥ 5 MHz
  • Opt. 45: MATE/CIIL language interface

Links

Connections

Front panel inputs/outputs are: RF INPUT 50Ω (N connector), CAL OUT (BNC connector), LO OUTPUTS (SMA connectors), EXTERNAL MIXER RF INPUT (TNC connector), and Camera Power. The LO outputs can be used to connect an external waveguide mixer like the WM490 series, or to connect a TR503 tracking generator.

Rear panel inputs/outputs are: PROBE POWER (Provides operating voltages (+5V, -15 V, +15 V; 100 mA max each) for active probes); HORIZ|TRIG (EXT IN) BNC connector (A dual function connector: When in External Triggering mode the connector is an AC coupled input for trigger signals. When the TIME/DIV selection is EXT the connector is a DC coupled input for horizontal sweep voltages); MARKER/VIDEO (EXT IN) BNC connector (Available on instruments without Opt. 42 only. See 110 MHz IF for Opt. 42 instruments. This connector interfaces the spectrum analyzers with a Tektronix 1405 TV Adapter to display an externally-generated marker) 110 MHz IF (OUTPUT) BNC connector (Available on Opt. 42 utilizing the HORIZ (OUTPUT) connector. This connector provides 110 MHz IF output with a bandwidth greater than 5 MHz. Input external video signals into the PEN LIFT connector); HORIZ (OUTPUT) BNC connector (Supplies a 0.5 V/div horizontal signal); VERT (OUTPUT) BNC connector (Provides access to the video signal with 0.5 V for each division of displayed video above or below the center line.)

NOTE: Both HORIZ and VERT output signals are driven from digital storage if it is on. Both signals are driven from the analyzer sweep and video amplifier stage if digital storage is off;

PEN LIFT (OUTPUT) BNC connector (Provides access to a TTL compatible signal to lift the pen of a chart recorder during sweep retrace. This signal is always derived from the spectrum analyzer sweep. In Opt. 42 instruments, use this connector to input external video signals if pin 1 of the ACCESSORIES connector is grounded; 10 MHz IF (OUTPUT) BNC connector (Provides access to the output of the 10 MHz IF); EXT REF IN BNC connector (A 50Ω input for a 1, 2, 5, or 10 MHz external reference signals, within -15 dBm to +15 dBm level. Input signals must be a sinewave with a duty cycle symmetry of 40% to 60%, or ECL or TTL); J104 ACCESSORY female DB25 connector (Provides external video input selector on Pin 1 and external preselector out on Pins 2 and 3, Pin 5 is ground.); IEEE STD 488 PORT GPIB interface (Added to all "P" suffixed instruments)

Accessories originally included

Operator’s Manual; Programmer Manual; 6-ft 50Ω coaxial cable N-N; 18-inch 50Ω coaxial cable BNC-BNC; N male to BNC female adapter; Diplexer Assembly; Power Cord; spare fuses; CRT filter set consisting of amber and gray light filters plus mesh filter

Pictures

Components

Some Parts Used in the 494

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 AM502 CG5001 CG551AP FG501 FG502 FG503 OF150 OF151 OF152 OF235 OS261 RM502A R1140 R5030 R5031 R7912 067-0679-00 067-0807-00 1101 1140A 1141 1142 1350 145 1450 1480 1481 1482 1485 1501 1801 1900 1910 1980 213 26A1 26A2 2620 285 3A9 3A10 3S1 3S2 3S5 3S6 432 434 4501 454 4601 4602 4610 4612 4620 4632 4634 4701 475 492 492A 492AP 494 494P 496 496P 5A13N 5A20N 5A21N 5A22N 5A26 5L4N 502A 5030 5031 576 690SR 7A22 7A29 7B51 7B71 7J20 7L5 7S11 7S12 7912AD
155-0035-00 155-0035-00 155-0116-00 Monolithic integrated circuit quad op-amp 3110 3S7 3T7 492 492A 492AP 492P 494 494P 496 496P 4010 4011 4012 4013 7L5 7L12 7L13 7L14 7L18 7S11 7T11 7S12 S-6 1461 4602 P7001 613 653
155-0106-00 155-0106-00 Monolithic integrated circuit normalizer J20 492 492A 492AP 492P 494 494P
155-0157-00 155-0157-00 Monolithic integrated circuit digital storage vertical control 7L5 7L14 7L18 491 492 492A 492BP 492PGM 494 494A 495 496 497P
155-0158-00 155-0158-00 Monolithic integrated circuit digital storage horizontal control 7L5 7L14 7L18 491 492 492A 492BP 492PGM 494 494A 495 496 497P
155-0285-00 155-0285-00 Hybrid integrated circuit leveling circuit 494
155-0286-00 155-0286-00 Hybrid integrated circuit distribution amplifier 494
155-0287-00 155-0287-00 Hybrid integrated circuit mixer 494


Some Parts Used in the 494P

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 AM502 CG5001 CG551AP FG501 FG502 FG503 OF150 OF151 OF152 OF235 OS261 RM502A R1140 R5030 R5031 R7912 067-0679-00 067-0807-00 1101 1140A 1141 1142 1350 145 1450 1480 1481 1482 1485 1501 1801 1900 1910 1980 213 26A1 26A2 2620 285 3A9 3A10 3S1 3S2 3S5 3S6 432 434 4501 454 4601 4602 4610 4612 4620 4632 4634 4701 475 492 492A 492AP 494 494P 496 496P 5A13N 5A20N 5A21N 5A22N 5A26 5L4N 502A 5030 5031 576 690SR 7A22 7A29 7B51 7B71 7J20 7L5 7S11 7S12 7912AD
155-0035-00 155-0035-00 155-0116-00 Monolithic integrated circuit quad op-amp 3110 3S7 3T7 492 492A 492AP 492P 494 494P 496 496P 4010 4011 4012 4013 7L5 7L12 7L13 7L14 7L18 7S11 7T11 7S12 S-6 1461 4602 P7001 613 653
155-0106-00 155-0106-00 Monolithic integrated circuit normalizer J20 492 492A 492AP 492P 494 494P