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GW Instek GSP-818 - 1.8GHz


GW Instek

Category : Spectrum Analyzers

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PC Software Datasheet User's Manual Programming Manual


GSP-818 is a new general spectrum analyzer, which supports a frequency range of 1.8 GHz and provides testing requirements for RF products during the development /production phases. GSP-818 has a built-in 20dB amplifier and provides an adjustable range of resolution bandwidth (RBW) from 10Hz to 3MHz. In addition, it has the AM/FM signal demodulation function and the ACPR/OCBW/CHPW test functions to meet the requirements of general RF signal measurement.

In addition, the built-in Time Spec function of GSP-818 can simultaneously view the correlation between display power, frequency and time. The Bandwidth Zoom function can be used to view the spectrum performance of signals under different Span. The Limit Line function provides two different Limit Line settings: Windows Measure and Limit Line Measure. Users can use these functions for a wider range of measurement applications.

To achieve clearer signal observation, GSP-818 utilizes a 10.4” large screen with SVGA (800 * 600) resolution. Pertaining to the communications interface, GSP-818 provides both USB and LAN interfaces. Via the USB Host, users can quickly retrieve the files saved after measurements. The USB Device and LAN interface allow users to control through the dedicated PC software or to use the required program designed by the corresponding commands.

GSP-818 also offers two options: TG and EMI Detector. It is different from the previous models. If customers require options, there is no need to send the equipment back. Customers only need to purchase the corresponding software license (Software Keycode) to activate the purchased option, which greatly improves the operational efficiency.

  1. Trace and Marker Functions: Five traces are provided, and the marker function can be assigned to different traces.
  2. 10Hz RBW: GSP-818 provides a minimum 10Hz RBW resolution and provides a 1-10 steps setting below the 500kHz RBW to allow a flexible signal detection.
  3. AM and FM Demodulation: GSP-818 provides AM and FM demodulation and supports demodulated audio output.
    1. The ACPR function can set up to three sets of adjacent channel tests.
    2. The power density of the signal can be measured through the OCBW function.
    3. CHPW is used to measure the power strength of the signal in a user-defined.
  5. Bandwidth Zoom: The Bandwidth Zoom function is used to view the spectral performance of the signal under different span.
  6. Time Spec: This function can simultaneously view the correlation between display power, frequency and time, and it can also track frequency and power with the variation of time.
  7. Limit Line: It can directly judge whether the test result of the DUT is qualified according to the preset test qualification conditions. GSP-818 offers two Limit Line measurements: windows measure and limit line measure.


General Specifications

Dimensions & Weight421mm(W) × 221mm(H) × 115mm(D)/Approx. 5.0 kg(without package)
Storage Temperature-20°C to 70°C
Operating Temperature0 °C to 40°C
Mass Memory
Internal Memory256M Bytes
Remote Control
LAN10/100Base, RJ-45
Type10.4 inches, TFT LCD, 800*600 (SVGA), 65536 colors


Inputs and Outputs

Resolution800*600, 60 Hz
Connector15-pins, D-SUB(female)
USB DeviceB Plug, 2.0 Version
USB HostA Plug, USB 2.0 (Host End)
Reference Input
10MHz Reference Amplitude0 dBm to +10 dBm
ConnectorBNC Female
Tracking Generator Output
ConnectorN Type Female
Impedance50 Ω, Typical
RF Input
ConnectorN Type Female
Impedance50 Ω, Typical


Frequency Counter

Accuracy±(frequency indication × frequency reference accuracy+ counter resolution
Counter Resolution1Hz, 10Hz, 100Hz, 1kHz



FM Measurement
Deviation Accuracy±4%, nominal
Deviation20 Hz to 200 kHz
Modulation Rate Accuracy1Hz, nominal(Modulation rate < 1 kHz); <0.1% modulation rate, nominal(Modulation rate≥1 kHz)
Modulation Rate20 Hz to 100 kHz
Frequency Range10 MHz to 1.8 GHz
AM Measurement
Depth Accuracy±4%, nominal
Depth5% to 95%
Modulation Rate Accuracy1Hz, nominal(Modulation rate < 1 kHz); <0.1% modulation rate, nominal(Modulation rate≥1 kHz)
Modulation Rate20Hz to 100kHz
Frequency Range10MHz to 1.8GHz
Audio Demodulation
Demodulation TypeFM/AM/USB/LSB
Frequency Range100 kHz to 1.8 GHz


Tracking Generator (Option 01)

Tracking Generator Output
Maximum Safe Reverse LevelAverage total power: 30 dBm, DC : ±50 VDC
Output Flatness± 3 dB
Output Power Level Resolution1 dB
Output Power Level Range-30 dBm to 0 dBm
Frequency Range100 kHz to 1.8GHz



Span ModeContinue, Single
Zero Span1 ms to 3000 s
None-zero Span10 ms to 3000 s



Input Related Spurious-30 dBm signal at input mixer, 20°C to 30°C; <-60 dBc
Residual Responseconnect 50 Ω load at input port, 0 dB input attenuation, 20°C to 30°C; <-85 dBm, from 100 kHz to 1.5 GHz; <-80 dBm, from 1.5 GHz to 1.8 GHz
1 dB Gain Compressionfc≥50 MHz, 0 dB RF attenuation, Preamp off , 20°C to 30°C ; >+2 dBm, Nominal
Third-order Intermodulationfc ≥ 50 MHz, Input double tone level -20 dBm, frequency interval 100 kHz, input attenuation 0 dB, preamplifier off, 20°C to 30°C; +10 dBm
Distortion and Spurious
Second Harmonic Distortionfc≥50 MHz, Preamp off, signal input -20 dBm, 0 dB RF attenuation, 20°C to 30°C; -65 dBc
Uncertainty and Accuracy
VSWRInput 10 dB RF attenuation, 1MHz to 1.8GHz; <1.5, Nominal
UncertaintyInput signal range 0 dBm to -50 dBm; ±1.5 dB
Preamp On±0.5 dB, input signal level -40 dBm
Preamp Off±0.4 dB, input signal level -20 dBm
Absolute Amplitude Uncertainty20°C to 30°C, fc=50 MHz, Span=200 kHz, RBW=10 kHz, VBW=10 kHz, peak detector, 10 dB RF attenuation, 95% confidence level
Input Attenuation Uncertainty20°C~30°C, fc=50 MHz, Preamplifier Off, 10 dB RF attenuation, input signal 0~40 dB ±0.5 dB
RBW Switch UncertaintyReference: 10 kHz RBW at 50 MHZ; Log resolution=±0.2 dB, Lin resolution=±0.01 Nominal
Frequency Response
Preamp On(fc≥100 MHz)±0.9 dB:±0.5 dB, Typical
Preamp Off(fc≥100 kHz)±0.8 dB:±0.4 dB, Typical
Display Average Noise Level
Preamp On
1 GHz ~ 1.8 GHz-148 dBm (Typical)
10 MHz ~ 1 GHz-150 dBm (Typical)
1 MHz ~ 10 MHz-150 dBm (Typical)
100 kHz ~ 1 MHz-140 dBm (Typical)
Preamp Off
1 GHz ~ 1.8 GHz-128 dBm (Typical)
10 MHz ~ 1 GHz-130 dBm (Typical)
1 MHz ~ 10 MHz-130 dBm (Typical)
100 kHz ~ 1 MHz-117 dBm (Typical)
Max Continuous Power+30dBm, average continuous power
Amplitude and Level
Max Input DC Current50 VDC
Input Attenuation0 to 40 dB, in 1 dB step
Preamp20 dB, nominal, 100 kHz to 1.8 GHz
Reference Level-80 dBm to +30 dBm, 0.01dB by step
Amplitude Measurement RangeDANL to +10 dBm, 100 kHz to 1 MHz, Preamp Off; DANL to +20 dBm, 1 MHz to1.8 GHz, Preamp Off



Video Bandwidth(VBW)10 Hz to 3 MHz
Resolution Filter Shape Factor(60dB:3dB)< 5:1 typical (digital and close to Gaussian shape)
RBW Uncertainty< 5%, typical (RBW≤1 MHz); Dedicated Remote Control PC Software
Resolution Bandwidth10Hz to 500kHz (1-10 steps by sequence), 1MHz, 3MHz (Option) 200 Hz, 9 kHz, 120 kHz, 1 MHz for EMI(-6dB)
SSB Phase Noise
1 MHz< -110 dBc/Hz(Typical)
100 kHz< -98 dBc/Hz(Typical)
10 kHz< -82 dBc/Hz
Internal Frequency Reference
Aging rate< 1ppm/year
Temperature Stability< 2.5ppm (15°C to 35°C)
Reference Frequency Accuracy± [(days from last calibrate × freq aging rate) + temperature stability + initial accuracy ]
Span Range10.000000 MHz
Frequency Span
Span Uncertainty± span/(sweep points-1)
Span Range0 Hz, 100 Hz to max. frequency of instrument
Range9kHz to 1.8 GHz

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