Electro-Metrics EM-6912A User manual

INSTRUCTION MANUAL
BICONICAL ANTENNA
MODEL EM-6912A
30 MHz - 300 MHz

INSTRUCTION MANUAL
THIS INSTRUCTION MANUAL AND ITS
ASSOCIATED INFORMATION IS PRO-
PRIETARY. UNAUTHORIZED REPRO-
DUCTION IS FORBIDDEN.
 2017 ELECTRO-METRICS CORP.
BICONICAL ANTENNA
30 MHz - 300 MHz
ELECTRO-METRICS
MODEL EM-6912A
SERIAL NO: TYPICAL
ELECTRO-METRICS CORPORATION
231 Enterprise Road, Johnstown, New York 12095
Phone: [phone] Fax: [phone]
EMAIL: [email protected]m WEB: http://www.electro-metrics.com
MANUAL REV. NO: EM6912A-0317 ISSUE DATE: March 22, 2017

WARRANTY
This Model EM-6912A Biconical Antenna is warranted for a period
of 12 months (USA only) from date of shipment against defective
materials and workmanship. This warranty is limited to the repair
or replacement of defective parts and is void if unauthorized repair
or modification is attempted. Repairs for damage due to misuse or
abnormal operating conditions will be performed at the factory and
will be billed at our commercial hourly rates. Our estimate will be
provided before the work is started.

ELECTRO-METRICS EM-6912A BICONICAL ANTENNA
(EM6912A-1)
DESCRIPTION AND USE
ELECTRO-METRICS
MODEL EM-6912A BICONICAL ANTENNA
1.0 Description
The EM-6912A Biconical Antenna performs E-field measurement over the fre-
quency range of 30 MHz to 300 MHz in accordance with FCC Part 15 and 18, VDE 0871
and 0875, MIL-STD-461 Methods RE02, RE102, plus other commercial, military, and
government EMI specifications.
The fixed biconical elements are made from aluminum rod that are welded to the
end pieces. Each element cage has a cross piece connecting the center element to an outer
element to eliminate a common resonance. The elements screw into terminals located at
opposite sides of a circular PVC housing containing the balun network.
A Tripod Mounting Clamp included with the antenna, is used to mount the anten-
na to the EM-6136 Tripod.
Each antenna is calibrated at 1 meter, 3 meters and 10 meters during manufactur-
ing, with the data included in the manual as gain and antenna factors versus frequency.
Refer to Table 1.0 for the maximum power handling capability of the EM-6912A.
The balun, feedline, and element cage design contribute to producing a response
curve that is almost linear. This makes the antenna ideal for vertical and horizontal swept
site attenuation measurements per ANSI and FCC specifications.
To ensure consistency of data collection, the antenna should be orientated in the
same position in each measurement run. In order to maintain the same orientation, the
antenna name label on the antenna housing should:
a) Horizontal orientation: Name label facing downwards to ground.
b) Vertical orientation: Name label on the right side of the antenna
should be on the right side as observed from
the connector end of the antenna.
Note: The data on the calibration chart below 30 MHz
is for informational use only. Calibration toler-
ances are not specified below 30 MHz.
2.0 Specifications
2.1 Electrical
Frequency (calibrated): 30-300 MHz
(Antenna Factor Chart furnished with each antenna.)

ELECTRO-METRICS EM-6912A BICONICAL ANTENNA
(EM6912A-2)
Input Impedance: Matched to 50 NOMINAL.
VSWR: Average: 1.4:1 with 6 dB fixed
attenuator.
Maximum: 1.8:1 with 6 dB fixed
attenuator.
Maximum Continuous Power: 0.5 W
Peak Power: 1.0 W
Output Connector: BNC, female.
2.2 Mechanical
Length: 129.8 cm (51") tip-to-tip.
Diameter: 50.8 cm (20").
Depth: 54 cm (21.5”) including balun.
Weight including fixed elements: 2.7 kg (6 lb).
Table 1.0
Typical Power Handling Before Saturation
Electro-Metrics Model EM-6912A Biconical Antenna
Frequency
(MHz)
Power (Max.)
(mW)
Frequency
(MHz)
Power (Max.)
(mW)
30 82.4 110 4.72
35 108.8 115 6.32
40 66.9 120 4.93
45 107.4 125 4.89
50 82.8 130 3.40
55 85.8 135 3.79
60 93.3 140 1.02
65 42.0 145 0.7147
70 31.6 150 0.5071
75 26.5 155 0.4735
80 16.9 160 0.4286
85 7.63 200 0.4297
90 10.2 220 0.4282
95 8.92 270 0.4276
100 5.64 300 0.4297
105 7.89

ELECTRO-METRICS EM-6912A BICONICAL ANTENNA
(EM6912A-3)
3.0 Calibration Data
The Electro-Metrics Model EM-6912-A Biconical Antenna is calibrated at 1 Me-
ter, 3 Meter, and 10 Meter. The data is presented in tabulated form as Gain and Antenna
Factors versus Frequency, Figure 1-3.
Figure 1: 1 Meter: Page 3
Figure 2: 3 Meter: Page 4
Figure 3: 10 Meter: Page 5
Typical Gain and Antenna Factors
are shown in the following charts
The manual for each individual antenna will be shown as noted above.

ELECTRO-METRICS EM-6912A BICONICAL ANTENNA
(EM6912A-4)
0.00
5.00
10.00
15.00
20.00
25.00
30.00
0 50 100 150 200 250 300 350
Antenna Factor (dB/m)
Frequency (MHz)
EM-6912A Typical Antenna Factors
1m 3m 10m
-30.00
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
0 50 100 150 200 250 300 350
Gain (dBi)
Frequency (MHz)
EM-6912A Typical Gain Factors
1m 3m 10m