The 903 series is designed as a building block for broadband high power FM arrays for broadcasting in the FM Band (87.5 - 108 MHz). The 903 series is designed for use on triangular cross section masts.
The 903CP panel comprises two crossed dipoles mounted off a reflective screen. This configuration allows circular polarization. The 903HP comprises two horizontal dipoles mounted off a reflective screen for horizontal polarization. Similarly the 903VP comprises two vertically mounted dipoles off a reflective screen for vertical polarization.
In some configurations the dipoles are angled towards the screen reducing backlobes and making the panel ideal as an array element on 3 sided towers or masts.
The design utilizes stainless steel radiators with galvanized screen and ensures a very long trouble free life, even when installed in remote hostile environments.
The 903 panels can be arranged to provide the required coverage for a particular service area. Array design can be carried out by RFS engineers. Both directional and omnidirectional patterns are available as well as beam tilt and null fill to customer specification. Panels are fed through a power divider network which is designed to meet the power handling requirements of the array. As each panel is rated at 2 x 5kW, higher power ratings are easily achievable. The system should be fully pressurized in a high power configuration. For low to medium power applications a power distribution and cable network utilizing foam feeders and un-pressurized power dividers is available.
FEATURES / BENEFITS
Full band (87.5 - 108MHz) operation
Low cost alternative to the 4 sided antenna
Suitable for multichannel use
Two inputs per panel
Available in pressurized or unpressurized versions
Solid galvanized steel screen construction
Dipole elements are stainless steel
Designed for minimum windload
Radomes and special 'O' rings available for icing conditions
Temperature range -40 to +60 degrees C available.
903HP Series Antenna
Band II (VHF) 903HP FM Panel Arrays
87.5 - 108
Nominal Gain (Mid-band)
2 x 7-16 DIN 2 x 7/8" EIA Flange
4 x U bolts
Recommended Spacing between Bays
Effective Area Front (full antenna) No Ice
Effective Area Front (full antenna) with 12.5mm(0.5") Radial Ice
Effective Area Side (full antenna) No Ice
Effective Area Side (full antenna) 12.5mm (0.5") Radial Ice
Design Wind Speed
10 - 25 (1.5 - 3.6) 7/8" EIA Version
100 (15) 7/8" EIA Version
Shipping Weight, Kg (lb)
Material - Insulators
Material - Radiators
Material - Reflecting Screen
External Document Links
Note 1 Power rating per input is limited by input connector. 4kW for 7-16 DIN, 5kW for 7/8" EIA