Data sheet - Shively Labs
Shively Labs
®
Model 6828 FM Antenna
True circular polarization
Handles up to 20 kW per bay 2
Multiplexes over 10 MHz bandwidth
Shively standard features:
•
•
•
•
•
•
•
Consistently predictable patterns
-ready
Pattern studies available
No factory personnel needed to install
Radomes and deicers available
Rugged corrosion-resistant mounts
Null fill, beam tilt, and special bay spacing available - contact the factory
Performance Specifications:
Polarization:
Right circular.
VSWR:
< 1.2 : 1 over 10 MHz;
< 1.1 : 1 over 7 MHz.
Azimuth pattern circularity: Horizontal component ± 1.5 dB
on pole.
Input connection:
Optional - contact the factory.
Electrical Specifications:
No. of
bays
Gain
Maximum power
rating
Typical power rating,
3-1/8" input 3
Typical power rating,
6-1/8" input 3
Power
dB
kW
kW @ 98 MHz
kW @ 98 MHz
1
0.46
-3.40
20
12
—
2
1.01
-0.044
40
24
—
3
1.58
1.995
60
36
—
4
2.16
3.335
80
45
—
5
2.72
4.349
100
45
—
6
3.28
5.163
100
45
—
8
4.40
6.433
100
—
90
10
5.52
7.416
100
—
90
12
6.64
8.221
100
—
90
Notes:
1. Our gain figures are derived from the computed directivity and include the losses in the antenna feed system. Gain is provided
for one polarization and is equal in circularly polarized antennas for both horizontal and vertical components. Gain will be
reduced if null fill, beam tilt is provided. Gain will increase in a directional array by the directivity of the azimuth pattern.
2. With specially-designed rigid feed systems.
3. With high-power flexible feed system and specified input connector size.
Document No. ds-6828 (170323)
A Division of Howell Laboratories, Inc., P. O. Box 389, Bridgton, Maine 04009 USA
(207) 647-3327
1-888-SHIVELY
An Employee-Owned Company
Fax: (207)647-8273
www.shively.com
sales@shively.com
Certified to ISO-9001
Size and weight:
Vertical Tower Space
No. of
Bays
Weight
Antenna
radiation
aperture
Physical
space
used
Total tower
space
recommended
Without
radomes
With
radomes
With radomes &
1/2” (1.2 cm)
radial ice
ft (m)
ft (m)
ft (m)
lb (kg)
lb (kg)
lb (kg)
2.0 (0.7)
7.5 (2.29)
27.5 (8.38)
120 (54.5)
225 (103)
346 (157)
2
9.0 (2.74)
16.5 (5.03)
36.5 (11.03)
240 (109)
450 (205)
692 (315)
3
18.0 (5.48)
25.5 (7.76)
45.5 (13.85)
360 164)
675 (307)
1038 (472)
4
27.0 (8.23)
34.5 (10.52)
54.5 (16.52)
480 (218)
900 (409)
1385 (630)
5
36.0 (10.96)
43.5 (13.24)
63.5 (19.33)
600 (273)
1125 (511)
1731 (787)
6
45.0 (13.72)
52.5 (16.00)
72.5 (22.00)
720 (327)
1350 (614)
2077 944)
1
8
63.0 (19.20)
70.5 (21.49)
90.5 (27.49)
960 (436)
1800 (818)
2769 (1259)
10
81.0 (24.69)
88.5 (26.97)
108.5 (32.97)
1200 (545)
2250 (1023)
3461 (1573)
12
99.0 (30.17)
106.5 (32.46)
126.5 (38.46)
1440 (655)
2700 (1227)
4154 (1888)
Revision 'G' effective projected area:
No. of
Bays
Without
radomes
With
radomes
With radomes
& 1/2” (1.2 cm)
radial ice
With radomes
& 1” (2.5 cm)
radial ice
With radomes
& 2” (5.1 cm)
radial ice
ft2
ft2
ft2
ft2
ft2
EPAN
EPAT
EPAN
EPAT
EPAN
EPAT
EPAN
EPAT
EPAN
EPAT
1
6.2
5.8
10.9
10.9
13.0
13.0
13.7
13.7
14.9
14.9
2
12.5
11.7
21.7
21.7
26.0
26.0
27.4
27.4
29.9
29.9
3
18.7
17.5
32.6
32.6
34.1
34.1
41.0
41.0
44.8
44.8
4
25.0
23.4
43.4
43.4
52.1
52.1
54.6
54.6
59.7
59.7
5
31.2
29.2
54.3
54.3
65.1
65.1
68.3
68.3
74.7
74.7
6
37.5
35.0
65.1
65.1
78.1
78.1
82.0
82.0
89.6
89.6
8
50.0
46.7
86.8
86.8
104.2
104.2
109.3
109.3
119.5
119.5
10
62.5
58.4
108.5
108.5
130.2
130.2
136.6
136.6
149.4
149.4
12
75.0
70.1
130.2
130.2
156.3
156.3
163.9
163.9
209.9
209.9
Notes:
4. The mounting structure must not flex more than ± 1/2 in (± 1.2 cm) in any 10-ft (3-meter) section. 5 feet (1.5 m) of mounting
structure is required above and below the antenna bays for proper pattern formation.
5. Antenna radiation aperture is the distance from the center of the top bay to the center of the bottom bay. Physical space used
is from the top of the top bay to the input flange at the bottom of the array, or the bottom of the bottom bay in a center-fed
array. Total tower space recommended allows ten feet (3 m) of clear tower space above and below the antenna to protect
from pattern interference by other antennas. At frequencies lower than 98 MHz, each of these dimensions will increase by up to
1 ft (0.3 m) per bay.
6. Windload and weight tabulations are estimates. They include the bay and input connection. No values have been included
in these tabulations for mounts. Actual values vary with the specific installation. Contact us with details of your installation if
more precise values are needed.
7. The effective projected area (EPA) is calculated per TIA standard ANSI/TIA-222-G.
EPAN - Effective projected area associated with the windward face normal to the azimuth of the antenna: EPAN = Σ(CaAc)N
EPAT - Effective projected area associated with the windward face at the side of the antenna: EPAT = Σ(CaAc)T
8. Deicers add approximately 1 lb (0.45 kg) per bay in weight and 2 lb (0.9 kg) or 0.05 ft2 per bay in windload.
9. Ask for technical assistance at Shively if you are planning to mount antennas on AM towers or install them at altitudes over
3,000 ft (915 m) above mean sea level.
2
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