NEAR-FIELD PROBES, HIGH-FIELD EMC SOURCES, CALIBRATION STANDARDS, MONITOR HORNS

Near-Field Probes Probes are available in the frequency range of 1 - 40 GHz and are used in near-field test ranges. They are simple, well-characterize, linear polarized open wavehuide antennas with internal impedance matching. They all have a standard mounting bracket. Nominal gain is 9 dBi. Gain calibrations at three test frequencies and swept VSWR data are supplied with each unit. Model Number Frequency GHz Waveguide Size RF Port 9223-820 1.12 - 1.70 WR-650 SMA Jack 9233-810 1.70 - 2.60 WR-430 SMA Jack 9233-830 2.60 - 3.95 WR-284 SMA Jack 9233-840 3.95 - 5.85 WR-187 SMA Jack 9233-860 5.85 - 8.20 WR-137 SMA Jack 9233-800 8.20 - 12.4 WR-90 SMA Jack 9233-805 10.0 - 15.0 WR-75 SMA Jack 9233-850 26.5 - 40.0 WR-28 WR-28 flange

Model 9223-820 WR-650 Probe

From 100 - 400 MHz, a truncated high-power log-periodic structure is used. In the frequency range above 400 MHz, the system is based upon the off-axis focussing properties of a parabolic reflector and consist of a 1.8-meter reflector and a set of six interchangeable linear-polarized feeds. The feeds are mounted in a predetermined off-focus position. the test artical is then placed in a high-field zone located on the opposite side of the reflector axis.

The standard working distance is 1 meter in front of the reflector. The axial depth of the high-field zone is approximately 0.5 meter. the lateral dimensions of the zone depend on the frequency and are typically 0.2 - 1.0 meter. The zone size is quite ample for testing many types of electronic equipment. This high-performance system is delivered with field strength calibrations at nine locations within the zone.

In addition, for use in narrow frequency bands, a smaller, 0.85-meter diameter axially-defocussed reflector is available with interchangeable vertex-mounted feeds.

Model Number Frequency GHz RF Power Watts, CW Field Strength Volts/Meter RF Port 9762-800 0.1 - 0.4 2,000 600 LC 9601-801 2.8 150 1,130 WR-284 9601-802 5.7 150 2,100 WR-187 9601-851 0.4 - 1.0 1,000 500(*) - 1,300 7/8 inch EIA 9601 - 856 1 - 2 400 1,000 - 1,250 N Jack 9601-855 2 - 4 200 1,000 - 1,800 SMA Jack 9601-857 4 - 8 200 2,000 - 2,200 N Jack 9601- 858 8 - 12 200 2,000 - 3,100 WR-90 9601-859 12 - 18 200 3,000 - 3,500 WR-62

Model 9601-850 and -856 1.8M EMC Antenna and 1-2 GHz Feed Model 9601-802 0.85M EMC Antenna

Calibration Standards

Calibration standard antennas are robust devices which are specially characterized for electrical performance. Each antenna is delivered with measured test data including swept VSWR, gain, cross-polarization or axial ratio at three test frequencies.Calibration antennas find applications as transfer standards in three-antenna measurement setups. They also replace gain standard horns where special performance is required. Both linear, circular and dual polarized designs are available.

Model 9451-860 0.2 - 2.0 GHz Grid Horn	Model 9451-870 0.5 - 4.0 GHz Grid Horn	Model 9308-800 0.9 - 2.0 GHz Dual Linear Quad-ridged Horn
Model 9401-823 Dual-ridged Horn 4.0 - 8.2 GHz	Model 8923 Dual Circular Conical Scalar Horns	Model 9401 Horn Family

Special Calibration Standard Antenna Systems

Model AS72-72C - 7.25 - 8.4 GHz. Parabolic Reflector, 40 dBic gain, Dual Circular polarization, Type N jacks (includes 1.8 meter diameter reflector, transit case, feed system and mount). Used as a secondary gain standard at NIST for characterizing DSCS satellite equipment.	Model 9531-870 - 1.525 - 1.661 GHz. 0.85 meter diameter 2-panel parabolic reflector, heavy-duty tripod mount, transit case, demountable circulaly polarized feed system, calibrated attenuators, filters, LNA with power supply and BIT test provisions in a weather-proof NEMA enclosure. Used as a transportable Earth Station for monitoring AMSC/TMI L-band satellites.
Model AS72S-72C 1.2M DSCS Calibration Standard	Model 9531-870 0.85M AMSC/TMI Monitoring Station
Model 9452-800 - 13.955 GHz. 0.6 meter offset reflector specially designed and defocussed to achieve a main beam flat within +/- 0.05 dB over 1 degree. Used to monitor the downlink signal of the ADEOS satellite during polar orbit passes. Dual linear polarization.	Model 9848-800 - 1.44 - 1.51 GHz. Similar to Model 9531-870. Also includes LHCP and RHCP omni antennas. Used as a monitor station for Worldspace satellites.
Model 9452-800 0.6M Antenna ADEOS Standard	Model 9848-800 33-inch Worldspace Monitor Stations

Monitor Horns
The following are low-cost pyramidal linear horns with an integral SMA Jack RF port and a flat rear mounting flange perpendicular to the boresight axis. They are available in commonly-used frequency bands and are very useful for general signal monitoring purposes. Nominal gain is 10 dBi.