Shively Labs FM Antennas and Accessories
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Typical Data for
Model 6832 FM Antenna

Circularly Polarized

Broadband

Up to 2.5 kW Rating per Bay

Features:

  • Broadband Without Retuning
  • Non-Pressurized Connectors
  • Easy to Install - Minimum Maintenance
  • Easily Disassembled for Shipment by Small-Package Carrier

Performance Specifications:

Band Width:
87.5 - 108 MHz
Polarization:
Right circular.
VSWR:
1.5 : 1 or better.
Azimuth Pattern Circularity:
Horizontal component ±1.5 dB on pole.
Input Connection:
2 to 6 bays: 1-5/8" EIA.
7+ bays: 3-1/8" EIA

Electrical Specifications:
No. of
Bays		 Gain
 Power
Rating
kW		 No. of
Bays		 Gain
 Power
Rating
kW
Power dB Power dB
2
0.85
-0.73
5.0
6
2.4
3.81
15
3
1.23
0.89
7.5
7
2.79
4.46
17.5
4
1.62
2.10
10
8
3.19
5.03
20
5
2.01
3.03
12.5
10
4.02
6.04
22.5

Notes:

Our gain figures are calculated by factoring the directivity to allow for losses in the radiating system. Due to this conservative approach, you are assured of radiating maximum ERP by using Shively's published gain figures. Gain is provided for one polarization and is equal in circularly polarized antennas for both horizontal and vertical components. Gain is computed for 98 MHz and will vary across the band.

Size and Weight:
No. of Bays Vertical Tower Space
 Weight
Antenna radiation aperture
 Physical
space used
 Total tower space recommended
 without
radomes
 with 1/2"
radial ice
ft m ft m ft m lb N lb N
2
6.4
2.0
16.4
5.0
36.4
11.1
106
472
162
720
3
12.8
3.9
22.8
7.0
42.8
13.0
150
667
245
1089
4
19.3
5.9
29.3
8.9
49.3
15.0
194
863
332
1476
5
25.7
7.8
35.7
10.9
55.7
17.0
242
1076
427
1899
6
32.1
9.8
42.1
12.8
62.1
18.9
289
1285
521
2317
7
38.5
11.7
48.5
14.8
68.5
20.9
348
1547
653
2904
8
44.9
13.7
54.9
16.7
74.9
22.8
420
1868
795
3536
10
57.8
17.6
67.8
20.7
87.8
26.8
544
2419
1076
4786

Windload:
No. of
Bays		 Revision "C"
 Revision "F"
without radomes
 with 1/2"
radial ice
without radomes
 with 1/2"
radial ice
lb N lb N ft² m² ft² m²
2
187
834
328
1463
6.7
0.6
12
1.1
3
258
1151
464
2069
11
1.0
20
1.8
4
332
1481
600
2676
16
1.5
28
2.6
5
405
1806
736
3283
21
1.9
38
3.5
6
478
2132
872
3889
27
2.5
48
4.4
7
551
2457
1008
4496
35
3.2
63
5.8
8
623
2779
1144
5102
43
3.9
76
7.0
10
769
3430
1416
6315
60
5.5
109
10.1

Notes:

  1. Antenna radiation aperture is the distance from the center of the top bay to the center of the bottom bay. Five feet (1.5 meters) of pipe is required above the top of the top bay and below the bottom of the bottom bay. Total tower space recommended allows ten feet (3 m) of clear tower space above and below the pipe to protect from pattern interference by other antennas.
  2. Windload and weight tabulations include the bay, interbay feedline, input connection, and power dividers.
  3. Antenna windloads are calculated for 112 mph (180 kph), using 50 psf (2400 N/m²) for flats and 33 psf (1600 N/m²) for rounds, per EIA standard RS-222-C and CSA standard S37-94. The surface area is calculated per EIA standard RS-222-F (CaAc).
  4. 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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Last updated: 01/09/08
Webmaster: Al Friend
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