Com-Power Comb Generator model CGO-520

This Comb Generator is a broadband EMC signal source for quick EMC site testing. It radiate signals up to 4.5 GHz with a step size of 20 MHz. Monitoring a few frequencies regularly on it's broadband radiated output can verify the entire setup.
Article number:
In stock
Delivery time:
7 - 12 days
Excl. tax

The CGO-520 Comb Generator is a conducted and radiated signal reference source. The signal contains frequency harmonics at 20 MHz intervals. These reference signals are used for validating EMC test sites; therefore the reference signal source must have a stable and precise output. Com-Power’s Comb Generators line is designed to meet this requirement.

Due to the broad frequency range, two antennas are supplied with the CGO-520, a 12” antenna for low frequency up to 450 MHz, and 2” antenna for 450 MHz and above. The radiated signals are generated by connecting one of the two antennas to the BNC connector located at the center of the CGO-520. The circular chassis of Comb Generator helps radiate the signal more uniformly in all directions within the same plane. The conducted reference signals can be obtained by connecting a Coaxial Cable between the SMA connector mentioned above and a Spectrum Analyzer.

The CGO-520 is powered by an enclosed rechargeable battery pack to minimize disturbances of external cables that might interfere with the radiated signal. When the battery voltage reaches below the operating level, the output signal will shut off automatically to prevent further use and misleading data. When fully charged, the battery allows continuous use of the Comb Generator for up to 18 hours. Batteries, charger and antennas are included.

EMI measurements are usually collected in an Open Area Test site (OATS) or inside an Anechoic Chamber. OATS and chambers must be calibrated before put into service using published calibration procedures at regular intervals. These calibration methods are very elaborate and time consuming to be performed before each test to ensure that the data taken is consistent and accurate.

The CGO-520 is a quick Site Verification tool that the test engineer can use to detect potential problems with site. Maintaining a log of the Comb Generator radiated readings, prior to taking measurement from a product in the same setup, and comparing them will help in detecting possible faults. The same process can be utilized when emissions measurements that are taken from the same products varies on a repeated test.

It is difficult to determine if it is the test site or the product causing the variation. Using the same test setup, measurements can be taken with a Comb Generator in place of the product. This data can be compared with previous Comb Generator measurements to determine the problem. Other uses of the Comb Generator include testing cables and filters.

  • Frequency range: 20 MHz to 4.5 GHz
  • Step Size of 20 MHz
  • Stable Frequency Output
  • Automatic Low Voltage Signal Shutoff
  • Battery Operated
  • Three Year Warranty

Comb Generator CGO-520 Radiated data graph

Tested at 3 meters, vertical polarization, antenna height varied from 1 to 4 meters.

Comb Generator CGO-520 radiaded test data graph1

Manufacturer: Com-Power
Model: CGO-520
Intended Application: EMI Radiated Site Reference Source
Frequency Range: 20 MHz to 4.5 GHz
Frequency Step Size: 20 MHz
Frequency Stability: 50 ppm
Amplitude Stability: ± 0.1 dB
Time Stability: <1 dB over 12 months
Charger Input: 110VAC 60 Hz or 230 VAC 50 Hz
Charger Output: 6 VDC, 500 mA
Battery Type: 6V NiMH, 1 Ah
Operating Time: > 18 Hours (Typical with fully charged battery)
External Indicators: Battery Low & Power On
Antenna Size: 2 and 12 inch Monopole
Dimensions: 17.7 cm x 1.9 cm / 7" x 0.75"
Weight: 0.9 kg
Polarization: Vertical and Horizontal
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