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Tektronix 2784
Spectrum Analyzer 100 Hz to 40 GHz
Tektronix 2784

Produced from 1993 to 1997

Manuals – Specifications – Links – Pictures

The Tektronix 2784 is a spectrum analyzer with a frequency range of 100 Hz to 40 GHz in coax, to 325 GHz with external waveguide mixers. The minimum resolution bandwidth is 3 Hz, with a minimum span of 10 Hz, and provides measurement resolution proportional to the frequency accuracy or span. In addition to conventional digital storage features, non-volatile memory (NVRAM) stores up to 20 separate waveforms with their readouts and markers, for later recall for additional analysis and comparison. Also, store up to 20 different front-panel control setups for future recall. The instrument can selectively count one particular signal out of several that may be present at its input.

The single and delta markers provide direct readout of frequency and amplitude information of any point along any displayed trace. Or, get the relative (delta) frequency and amplitude information between any two points along any displayed trace or between traces.

The additional major performance features of this instrument include: low phase noise, two user-assignable knobs, synthesizer frequency accuracy, remote operation over GPIB, precision signal counting, single and delta marker modes, precise amplitude measurement, digital storage and real time display, user-defined key sequences and macros, multiband sweep, front-panel keypad for data entry, three-color display, on-screen text entry, strong front end, full screen plot, menu-driven user interface, and dedicated function keys for commonly-performed tasks.

Front panel inputs/outputs are: RF INPUT 50Ω Planar Crown connector (Compatible with K or type N connectors); EXTERNAL MIXER SMA connector (50Ω) , LO OUTPUT SMA connector (Provides access to the output of the 1st local oscillator at >+4 dBm. Must be terminated in 50Ω at all times); REF SIGNAL OUT SMA connector (100 MHz -20dBm phase locked to reference oscillator); and ACCESSORY IN (general purpose serial data port); PROBE POWER (Provides operating voltages for active probes).

Rear panel inputs are: FREQ REF (IN/OUT) BNC connector (50Ω; Input signal freq. allowed: 10 MHz ±5 Hz, Input signal amplitude range: 0 dBm to +15 dBm max; Output signal: Nominally 0 dBm at 10 MHz (TTL-compatible), Phase noise allowed: ≤-100 dBc/Hz at 1 Hz offset); TRIG/HORIZ IN BNC connector (Nom 1 kΩ, or 8.25 kΩ (sweep mode), Input voltage change for triggering: 0.5V P-P, Input voltage for sweep: selectable between 0 V left side to +10 V right side of screen, between -5 V left side to +5 V right side of screen)); ACCESSORY female DB15 connector (External inputs and outputs); and INSTRUMENT BUS female DB9 connector (Serial communications bus that processors use to communicate with each other and rest of instrument modules).

Rear panel outputs are: V OUT BNC connector (50Ω; External display vertical signal output); H OUT BNC connector (50Ω; External display horizontal signal output); Z OUT BNC connector (50Ω; External display blanking signal output); IF OUT BNC connector (50Ω; Amplitude); and PORT 1 GPIB interface and PORT 2 GPIB interface.


Frequency Range
  • Coaxial Input Bands: 100 kHz to 40 GHz;
  • External Waveguide mixer: Extended to 325 GHz
Center Frequency Range
  • Coaxial Input Band: 100 Hz to 40 GHz;
  • External Mixer Input: 8 GHz to 1200 GHz
Resolution Bandwidth Range 6 dB bandwidths from 3 Hz to 10 MHz in 1, 3, 10 sequence
RF Input impedance 50 Ω
Maximum Safe Input Power
  • AC Average Power: +30 dBm continuous with ≥10 dB attenuation;
  • Pulse Power: +47 dBm (50W) peak, 1 µS and <0.005 duty factor with ≥50 dB attenuation;
  • DC: 0 volts, <100 mA continuous with 0 dB attenuation
External Mixer Input
  • Impedance: 50Ω with VSWR <1.9:1 at 525 MHz, and <2.2:1 at 3.525 GHz
  • Amplitude: Approx -40 dBm for full screen signal, with -20 dBm Reference Level and 20 dB mixer conversion loss
RF Attenuator Range 0 dB to 70 dB, 10 dB steps
Frequency Span Range
  • Internal Coaxial Bands: 100 kHz to 40 GHz
  • External Mixer Bands: 10 Hz to 600 Hz
Reference Level Range -140 dBm to +30 dBm; range extends to +60 dBm in overdrive mode
Marker Frequency Counter Range 100 Hz to 1.2 THz
LO Output Power ≥15 dBm at 8.105 Ghz to 17.9 GHz
Sweep Speed Range 200 s to 2 µs in 1, 2, 5 sequence
Video Bandwidth Range 0.03 Hz to 300 kHz in 1, 3, 10 sequence, and 10 MHz, ±25%
  • Internal: AC coupled; 10 Hz to 1 MHz;
  • External: DC coupled; 0 Hz to 5 MHz, or 0 Hz to 1.5 kHz;
  • Line: Copy of AC line
Displayed Average Noise −85 dBm to −135 dBm; w/WM782 Waveguide Mixer Series: -75 dBm to -115 dBm
Phase Noise Performance Low as -105 dBc/Hz at 10 kHz offset up to 21 GHz
Display Dynamic Range 100 dB
Included Accessories N-male to BNC-female adapter; N to Planar Crown Adapter; 50 ohm SMA Cable; Line Fuses: 4 A, 125 VAC and 4 A, 250 VAC; Power Cord; Operator’s Manual; Operator’s Reference Guide; Programmer’s Manual; Programmer’s Reference Guide; Installation and Performance Verification Manual
Weight 20 kg (44 lbs) with std accessories, cover, and no manuals
Power 90 − 132 VAC, 47 to 440 Hz, 180 – 250 VAC, 47 to 63 Hz. At 115 VAC, 60 Hz, 250 W max, 2.8 A. Standby power: 25 W max


  • Opt. 16: 49X/275X/279X Series GPIB Language
  • Opt. 18: WM782 Bands Q, U, V, E, and W (freq coverage from 33-110 GHz)
  • Opt. 19: WM782 Bands A, U, E, F, G, and J (freq coverage from 26-325 GHz)
  • Opt. 20: Utility software for PC, includes GPIB card
  • Opt. 30: Rackmount adapter (19 in.)
  • Opt. B1: Service Manual prepared to module level
  • Opt. B2: Complete set of manuals, including Service Manual