Shively Labs FM Antennas and Accessories
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Typical Data for
Model 6602B FM Antenna (half-wave-spaced)

  • Horizontal Polarization
  • Perfect for Translators
  • Digital Ready
  • No Pressurization Needed
  • The Choice of Campus Broadcasters
  • All Stainless Steel Construction
  • Designed for Pipe Mounting
  • Economical
  • No Factory Personnel Needed to Install
  • Radomes and Deicers Available
  • Special Spacing, Null Fill, Beam Tilt Available

Performance Specifications:

Polarization:
Horizontal.
VSWR:
1.08 : 1 ± 100 kHz.
1.16 : 1 ± 200 kHz
Input Connection:
Type "N" female.
Mounting:
Must be mounted on a metal pipe, 2" IPS (2-3/8 in) to 3" IPS (3-1/2 in) (60 - 89 mm) outside diameter. Pipe not supplied by Shively; requires 5 ft (1.6 m) of pipe above and below antenna.

Electrical Specifications (half-wave-spaced):
No. of
Bays		 Gain
 Power
Rating
W		 No. of
Bays		 Gain
 Power
Rating
W
Power dB Power dB
2
1.26
1.02
1500
5
2.80
4.47
1500
3
1.78
2.50
1500
6
3.30
5.19
1500
4
2.29
3.59
1500

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 horizontal polarization only. Gain will be reduced if null fill, beam tilt, or special wavelength spacing is provided.

Size and Weight (half-wave-spaced):

]
No. of Bays Vertical Tower Space
 Weight
Antenna radiation aperture
 Physical
space used
 Total tower space recommended
 without
radomes
 with
radomes
 with radomes &
1/2"radial ice
ft m ft m ft m lb N lb N lb N
2
4.3
1.3
14.3
4.3
24.3
7.4
10
45
80
357
122
544
3
8.5
2.6
18.5
5.6
28.5
8.7
17
76
122
544
187
834
4
12.8
3.9
22.8
6.9
32.5
32.8
23
103
163
727
252
1124
5
17.0
5.2
27.0
8.2
37.0
11.3
30
134
205
914
317
1414
6
21.3
6.5
31.3
9.5
41.3
12.6
37
165
247
1102
382
1704

Windload (full-wave-spaced):
No. of
Bays		 Revision "C"
 Revision "F"
without radomes
 with radomes
 with radomes & 1/2" radial ice
 without radomes
 with radomes
 with radomes & 1/2" radial ice
lb N lb N lb N ft² m² ft² m² ft² m²
2
13
58
134
598
153
682
0.4
0.0
3.5
0.3
4
0.4
3
20
89
202
901
234
1044
0.6
0.1
5.4
0.5
6.3
0.6
4
28
125
270
1204
315
1405
0.9
0.1
7.2
0.7
8.5
0.8
5
35
156
339
1512
395
1762
1.1
0.1
9
0.8
10.7
1.0
6
42
187
407
1815
476
2123
1.3
0.1
10.8
1.0
12.9
1.2

Notes:

  1. Antenna radiation aperture is the distance from the center of the top bay to the center of the bottom bay. Five feet 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 ft of clear tower space above and below the pipe to protect from pattern interference by other antennas.
  2. Antennas with two bays or an odd number of bays are end-fed; antennas with even numbers of bays are center-fed.
  3. Windload and weight numbers given are typical. Actual values vary with the specific installation. Contact us with details of your installation if more precise values are needed.
  4. Weight, windload, and space tabulations assume 98 MHz and include the bay, interbay feedline, input connection, and standard mounting brackets. At lower frequencies, length will increase by approximately 1 ft (31 cm) per bay.
  5. 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).
  6. Deicers add approximately 1 lb (4.4 N) per bay in weight and 2 lb (8.9 N) or 0.3 ft² (0.028m²) per bay in windload.
  7. Ask for technical assistance at Shively when you are planning to mount antennas on AM towers or install them at altitudes over 3,000 ft (915 m) AMSL.
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Last updated: 02/28/2007
Webmaster: Al Friend
© Copyright 2007 Howell Laboratories, Inc.