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Test
Equipment, Individually Calibrated Antennas and Accessories
for EMC Testing
Magnetic
Field Antennas, 100 Hz to 100 MHz
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Our BBH series
broadband magnetic field antennas are designed to
provide maximum sensitivity for receiving magnetic
field signals in the VLF through VHF spectrum. These
antennas are responsive primarily to the magnetic
component of an electromagnetic field with practically
no sensitivity to the electric component. The electrical
balance with respect to ground and cables renders
them almost immune to common mode interference.
BBH antennas are ideally suited for use with automatic
noise measuring equipment requiring magnetic field
sensors, vehicular surveillance applications, elementary
direction finding on ground waves, location of obscure
noise sources and for accurate measurement of magnetic
field intensity at practically all radian distances
from the source. They exhibit remarkably clean reception
inside of buildings, at some depth below the earth's
surface, in badly cluttered areas, and in environments
of locally generated man-made noise. |
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The basis of the
antenna is a ferrite rod to which a low noise amplifier is
coupled by means of a balanced loop. The far field receiving
pattern is that of an elementary dipole with nulls of approximately
-20 dB occurring off the ends of the rod. When oriented horizontally,
these antennas have an almost hemispherical overhead receiving
pattern, allowing excellent skywave reception at all frequencies
in their respective operating bands. Integral active networks
ensure the highest possible sensitivity in BBH antennas.
BBH antennas yield much greater accuracy in measuring
the tangential field of a source at close range than the typical
air core loop because the response of the air core loop becomes
adulterated by the incident electric field. All BBH
antennas, except the BBH-500, cover the entire frequency
range of operation in a single band. A switch on the BBH-500
allows the low and high bands to be used either separately
or simultaneously depending on performance requirements. A
calibration loop/port is provided for verifying that the antenna
is functioning properly. BBH-500, 1100, and
3100 antennas are intended primarily for use indoors,
including shielded rooms, but can be used equally well out
of doors if properly protected. An internal power supply and
rechargeable batteries in these antennas permit operation
under practically any condition, with a minimum amount of
setup time. BBH series antennas are ideally suited
for TEMPEST and other EMC testing applications requiring broadband
H-field measurements.
Specifications:
- Polarization: Linear. Senses H-field
in direction of ferrite rod.
- Impedance: 50 ohms, nominal.
- Power Supply: Internal Rechargeable
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BBH-500/B |
BBH-1100/A |
BBH-3100/A |
| Frequency |
300 Hz - 100 MHz |
100 Hz - 100 MHz |
300 Hz - 100 MHz |
| Dynamic
Range (dB) |
103 |
115 |
115 |
| Connector |
BNC Female |
BNC Female |
BNC Female |
| Size |
25"W x 9"H |
25"W x 6.5"H |
25"W x 6.5"H |
| Weight
lbs. (kg) |
21 (9.5) |
15 (7) |
15 (7) |
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Options:
- 230 volt ac operation
- Tripod TP-5
Note:
115/230 volt ac operation is standard on the BBH-500/B
* Calibration port is standard in BBH
series antennas
BBH-500/B
and BBH-1100/A - Typical H-field Antenna Factor
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