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DM NI7 Series L-Band
Flush Antennas
The DM NI7 series of L-Band annular slot antennas is the result of
20-years of continuous experience in the design and production of this
type of antenna.
Smaller Aperture—provides more signal at angles near the horizon;
regardless of aircraft attitude.
Moisture Proofing—ensures that DM NI7 antennas will not fail
because of the condensation which is inevitable with aircraft. Each
unit is sealed and plastic foam-filled. All materials have been carefully
selected and isolated to prevent galvanic corrosion.
Cabin Pressurization—is not jeopardized. The DM NI 7 antennas
will successfully withstand 25 psi when suitably gasketed. Their rugged
construction ensures that they will not be adversely affected by the most
severe vibrations encountered in flight.
P/N DM N17
TABLE 1. MOUNTING DATA
ANTENNA
TYPE
DM NI 7
DM NI 7-2
DM NI 7-8
DM NI 7-9
MATING
CONNECTOR
TYPE
C MALE
HN MALE
HN MALE
C MALE
RADIUS OF
BASE
71.50 R
20.00 R
71.50 R
71.50 R
Specifications
Electrical
Frequency Range
VSWR
Impedance
Polarization
Mechanical
960 to 1220 MHz
1.5:1 960 to 1220 MHz
1.4:1 1030 to 1090 MHz
50 OHMS
Vertical
Weight
21 oz.
Connector See table 1
Corrosion Resistance Impervious to Skydrol hydraulic fluid or
other normal corrosive aircraft fluids.
ARINC
532 D (ATC Transponder)
521 D (DME)
Military
MIL-E-5400
MIL-T-5422C
Immersion tested to MIL-E-5272A
AT-720/A only
MIL-A-256612
FAA TSO-C74 (ATC transponder )
TSO-C66 (DME)
Avionics & Accessories
EDO Corp./Dorne & Margollin
OUTLINE DIMENSIONS
Inches
MOUNTING HOLE
PATTERN
TYPE C
CONN
2.17
1.30
NOTE: FOR CONTOUR OF
BASE SEE TABLE 1
FORWARD
6.36
DIA
8.950 MAX
DIA
Specifications subject to change without notice.
0.189 DIA
12 HOLES EQUALLY SPACED
2 1 4 . 3 2 0 . 9 7 7 0 D a l l a s Av i o n i c s 8 0 0 . 5 2 7 . 2 5 8 1
171