Model: 6828
This high power system is rated at 20 kW per bay and can multiplex over 10 MHz.
-Pressurization Needed
-Consistently predictable patterns
-Allows multiplexing up to 10 MHz.
-.9 Wavelength Spacing
Performance Specifications:
Polarization: Right Circular
VSWR: Single Bay <1.2 :1 over 10 Mhz
<1.1 : 1 over 7 Mhz
Azimuth Pattern Circularity: Horizontal component + 1.5 dB on Pole
Input Connection: Sized for your needs, please contact factory
Model: 6828
This high power system is rated at 20 kW per bay and can multiplex over 10 MHz.
-Pressurization Needed
-Consistently predictable patterns
-Allows multiplexing up to 10 MHz.
-.9 Wavelength Spacing
Performance Specifications:
Polarization: Right Circular
VSWR: Single Bay <1.2 :1 over 10 Mhz
<1.1 : 1 over 7 Mhz
Azimuth Pattern Circularity: Horizontal component + 1.5 dB on Pole
Input Connection: Sized for your needs, please contact factory
High Power – Circulary Polarized
High Power – Vertical Polarized
High Power – Circulary Polarized
High Power – Elliptically Polarized
Model 6828 Full-wave Spaced
| No. of Bay | Gain | Maximum Power Rating | Typical power rating 3 1/8" input3<\sup> | Typical power rating 6 1/8" input3<\sup> | |
| 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 |
***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 will be reduced if special H/V ratio, or special wavelength spacing is provided.
Options:
-Radomes
-Null Full
-Beam Tilt
-Custom Mounts
Replacement Parts:
Radome
Bay
Feedline
Standard Mount
No Factory personal needed for installation. Please read the installation manual in full before assembly on site.
Installation & Mounting Layout
Model 6828 Antenna Weight & Wind Load
PLEASE CONTACT THE FACTORY FOR SITE SPECIFIC WEIGHT AND WIND LOADING FOR YOUR 6828 ANTENNA CONFIGURATION.
Weight Full-wave Spaced
| No. of Bays | Vertical Tower Space | |||||
| Antenna Radiation Aperture | Physical space used | Total tower space recommended |
||||
| ft | m | ft | m | ft | m | |
| 1 | 2.0 | 0.7 | 7.5 | 2.29 | 27.5 | 8.38 |
| 2 | 9.0 | 2.74 | 16.5 | 5.03 | 36.5 | 11.03 |
| 3 | 18.0 | 5.48 | 25.5 | 7.76 | 45.5 | 13.85 |
| 4 | 27.0 | 8.23 | 34.5 | 10.52 | 54.5 | 16.52 |
| 5 | 36.0 | 10.96 | 43.5 | 13.24 | 63.5 | 19.33 |
| 6 | 45.0 | 13.72 | 52.5 | 16.00 | 72.5 | 22.00 |
| 8 | 63.0 | 19.20 | 70.5 | 21.49 | 90.5 | 27.49 |
| 10 | 81.0 | 24.69 | 88.5 | 26.97 | 108.5 | 32.97 |
| 12 | 99.0 | 30.17 | 106.5 | 32.46 | 126.5 | 38.46 |
Windload Full-wave Spaced
| No. of Bays |
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 8 |
| 10 |
| 12 |
Notes:
WINDLOAD TABLE(S)
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 m) of the pipe is required above the top of the top bay and below the bottom bay. Total tower space recommended allows ten feet (3 m) of clear tower space above the center line of the top bay and below the center line of the bottom bay, to protect from pattern interference by other antennas. At frequencies lower than 98 MHz, each of these dimensions will increase by up to 1 foot (0.3 m) per bay.
2. Windload and weight tabulations assume full-wave bay spacing and include the bay, mounts and interbay feedline.
3. Antenna areas and weights calculated in accordance with TIA-222-G. EPA(N) – Effective projected area associated with the windward face normal to the azimuth of the antenna: EPA(N) = (Ca AA )N EPA(T) – Effective projected area associated with the windward face at the side of the antenna: EPA(T) = (Ca AA )T Assumptions: Structure Class II; Exposure category C; Topographic category 1; Maximum basic windspeed 90 mph; with 1/2 inch design ice, 40 mph; Maximum height above ground 200 ft.
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.
Typical Elevation Patterns
These patterns are based on 98.1 MHz, no beam tilt, no null fill. Contact factory for your customized elevation pattern
6828 Elevation Patterns Full-wave Spaced
6828-1
6828-2
6828-3
6828-4
6828-5
6828-6
6828-7
6828-8
Special Angle/Elliptical Polarization: Contact factory for elevation patterns
Sample Azimuth Patterns for Shively 6828 FM Antenna
NOTE: Model 6828 is not a directional antenna.
6828 Sample Azimuth Patterns
*Mounted on a 8″ Pole
*Mounted on a Pick-Up-Two Leg on a 36″ Face Tower
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