Atec 3121 User Manual
FEATURES
•
Broadband Baluns
•
Frequency Range of 28
MHz to 1 GHz
•
Ability to Receive or
Transmit
•
I
mprovement of FCC
Balun Design
•
Low VSWR
•
Low Balun Loss
•
Very Linear Antenna
Factors
•
Suitability for FCC or VDE
Site Attenuation
•
Carrying Case, Tripod
Mount and Tape
Measure
•
Individually Calibrated
•
Two Year Parts and Labor
Warranty
EMCO Model 3121 Adjustable Element Dipole Antenna Set
DESCRIPTION
The EMCO
Model 3121
dipole antenna with its set of
four compensated baluns offers an accurate standard
for precise EMI measurements. This model is an
i
mprovement of the FCC balun design and performs
close to the theoretically perfect lossless dipole.
With its close to ideal characteristics, the 3121 is well
suited for both EMI testing and site attenuation tests as
described in OST 55 and ANSI C 63.4.
Like all EMCO antennas, each 3121 dipole set is
individually calibrated and shipped with its own factors
as well as a signed Certificate of Conformance. The
result is an antenna with precisely
measured
factors.
Other commercially available antennas supply only
typical or theoretical factors. Accordingly, the EMCO
dipole user need not worry that an error in the antenna
factor will cause measurement errors during EMI testing.
EMCO dipoles are constructed of removable stainless steel
elements and machined and fabricated non-corrosive
metal baluns. A clamp block, delrin support rod and
aluminum mounting base are included in the set. The
aluminum mounting base accepts standard 1 /4 in. x 20
male threads from an EMCO tripod or most other
tripods. All components, including a tape measure, are
mounted in a shock resistant carrying case.
EMCO warrants its dipoles to be free from defects in
material or workmanship for two years. Annual
recalibration is suggested.
APPLICATIONS
RE = Radiated Emissions
PW = Plane Wave
ELECTRICAL SPECIFICATIONS
PHYSICAL SPECIFICATIONS
24
First in Quality.
STANDARD CONFIGURATION
Four element extension rods, 2 low frequency
adjustable elements, 2 medium frequency adjustable
elements, four baluns (DB 1-4), clamp block, support
rod, base drilled to accept EMCO or other tripod mount
with standard 1/4 in. x 20 male threads, one 5 meter
tape measure, one high frequency ruler for DB 4, 7.6 m
(25 ft.) of cable with N connectors (BNC available on
request), manual with Certificate of Conformance and
actual calibration factors, carrying case.
OPTIONS
None
WARRANTY
Two year parts and labor.
MODEL 3121
Typical Antenna Calibration at 3 Meter Spacing 20 Watts
Maximum Continuous Power
DB1
FIELD STRENGTHS
(E)
First in
Performance.
EMCO Model 3121 Adjustable Element Dipole
Antenna
Set with Case
2 5
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