Data sheet, full-wave-spaced

Data sheet, full-wave-spaced
Shively Labs
®
Model 6810 Circularly Polarized FM Antenna
Full-Wave-Spaced
True circular polarization
Power rating: 10 kW per Bay
Best sidemount in the industry for directionals
Will diplex over 2.2 MHz bandwidth
Shively standard features:
•
Ring stub design
•
Consistently predictable patterns
•
Digital-ready
•
Pattern studies available
•
No Factory personnel needed to install
•
Adjustable fine-matching transformer
•
Radomes and deicers available
•
Rugged corrosion-resistant mounts
•
Works with regular towers; no need for special frequency-sensitive tower sections
•
Pressure relief valve for easy purging of the system
•
Special spacing, H/V ratios, null fill and beam tilt available
Electrical specifications:
No. of
Bays
Gain
Power Rating
Power
dB
kW
1
0.45
-3.43
10
2
0.99
-0.04
3
1.56
1.92
4
2.14
5
2.73
6
3.33
No. of
Bays
Gain
Power Rating
Power
dB
kW
7
3.93
5.94
40
20
8
4.53
6.56
40
30
10
5.74
7.59
40
3.30
40
12
6.97
8.43
40
4.36
40
14
8.18
9.13
40
5.22
40
16
9.42
9.74
40
Performance specifications:
Notes:
Polarization:
1. Our gain figures are derived from the computed directivity
Right circular
and include the losses in the antenna feed system.
VSWR:
Single bay:
1.06 : 1 ± 100 kHz
1.1 : 1 ± 200 kHz
0.8 to 1.8 MHz spacing, each channel:
1.10 : 1 ± 100 kHz
1.20 : 1 ± 200 kHz
Greater than 1.8 MHz spacing: Contact the factory.
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,
special H/V ratio, or special wavelength spacing is provided.
Gain will increase in a directional array by the directivity of
the azimuth pattern.
Azimuth Pattern Circularity: Horizontal component ±1.5 dB on pole.
Input Connection: Female 3-1/8 in EIA
Document No. ds-6810-fw (170322)
A Division of Howell Laboratories, Inc., P. O. Box 389, Bridgton, Maine 04009 USA
(207) 647-3327
1-888-SHIVELY
Fax: (207)647-8273
An Employee-Owned Company
www.shively.com
sales@shively.com
Certified to ISO-9001
Model 6810 size and weight:
Vertical Tower Space
No. of
Bays
Antenna Radiation
Aperture
Pipe Length
Required
Weight
Total Tower Space
Recommended
Without radomes
With radomes
With radomes &
1/2” (1.2 cm)
radial ice
ft
m
ft
m
ft
m
lb
N
lb
N
lb
N
1
2
0.6
9
2.7
20
6.1
130
578
162
720
256
1138
2
10
3.0
19
5.8
30
9.1
200
889
264
1174
443
1970
3
20
6.1
29
8.8
40
12.2
270
1200
366
1627
630
2801
4
30
9.1
39
11.9
50
15.2
340
1512
468
2081
817
3632
5
40
12.2
49
14.9
60
18.3
410
1823
570
2534
1004
4464
6
50
15.2
59
18.0
70
21.3
480
2134
672
2988
1191
5295
7
60
18.3
69
21.0
80
24.4
550
2445
774
3441
1379
6131
8
70
21.3
73
22.2
90
27.4
636
2828
892
3966
1582
7033
10
90
27.4
93
28.3
110
33.5
776
3450
1096
4873
1956
8696
12
110
33.5
113
34.4
130
39.6
916
4072
1300
5780
2330
10359
14
130
39.6
133
40.5
150
45.7
1056
4695
1504
6687
2704
12022
16
150
45.7
153
46.6
170
51.8
1789
7954
1708
7594
3078
13684
Windload, TIA-222 Rev. G:
No. of
Bays
Without radomes
EPAN
ft
2
With radomes
EPAT
2
m
ft
2
EPAN
2
m
ft
2
With radomes & 1/2” (1.2 cm) radial ice
EPAT
2
m
ft
2
EPAN
2
m
ft
2
EPAT
2
m
ft
2
m2
1
5.2
0.5
5
0.5
7.2
0.7
6.6
0.6
8.3
0.8
7.5
0.7
2
9.5
0.9
9.7
0.9
13.5
1.3
13
1.2
16.5
1.5
13.0
1.2
3
13.9
1.3
14.5
1.3
19.9
1.8
19.3
1.8
24.6
2.3
23.6
2.2
4
18.2
1.7
19.2
1.8
26.2
2.4
25.7
2.4
32.8
3.0
31.7
2.9
5
22.6
2.1
23.9
2.2
32.6
3.0
32
3.0
41.0
3.8
39.7
3.7
6
26.9
2.5
28.6
2.7
38.9
3.6
38.4
3.6
49.2
4.6
47.8
4.4
7
31.3
2.9
33.4
3.1
45.3
4.2
44.7
4.2
57.4
5.3
55.9
5.2
8
35.6
3.3
38.1
3.5
51.6
4.8
51.1
4.7
65.6
6.1
63.9
5.9
10
44.3
4.1
47.5
4.4
64.3
6.0
63.8
5.9
81.9
7.6
80.1
7.4
12
53
4.9
57
5.3
77.0
7.2
76.5
7.1
98.3
9.1
96.2
8.9
14
61.7
5.7
66.4
6.2
89.7
8.3
89.2
8.3
114.7
10.7
112.3
10.4
16
70.4
6.5
75.9
7.1
102.4
9.5
101.9
9.5
131
12.2
128.4
11.9
Notes:
2. 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.
3. 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.
4. Seven bays or less are normally end-fed. All antennas supplied with beam tilt will be center-fed. Antennas with an odd number of
bays are normally not available with center feed.
5. Windload and weight tabulations are estimates and assume 98 MHz. They include the bay, interbay feedline, input connection,
and a fine-matching transformer. 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.
6. Antenna areas and weights calculated in accordance with TIA-222-G.
EPAN - Effective projected area associated with the windward face normal to the azimuth of the antenna: EPAN = (CaAA)N
EPAT - Effective projected area associated with the windward face at the side of the antenna: EPAT = (CaAA)T
Assumptions: Structure Class II; Exposure Category C; Topographic Category 1; Maximum basic windspeed 112 mph; with 1/2 inch
design ice, 50 mph; Height about ground 200 ft.
7. Deicers add approximately 1 lb (4.4 N) per bay in weight and a windload of EPAN = 0.7 ft2 and EPAT = 0.7 ft2 per bay.
8. 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.
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