DA 4504 is a four-dipole element array - wide band UHF antenna for professional radio systems. Dipole incorporates balun matching circuit optimized for wide bandwidth and accurate matching. Dipoles in array are coupled by precision phasing cable harness keeping low SWR and minimum insertion losses. All antenna parts are made of aluminium and covered with polymer powdered coating which resists water and ice buildup, and provides exceptional protection from corrosive gases, UV radiation, salt spray, acid rain and windblown abrasives.
All components of dipole elements are DC-grounded for better lighting and anti-static protection. Frequency range, MHz 400 470. It is a serially manufactured antennas, it has high quality and reliability. Important: each antenna produced for each specific order and personal.
Customer frequency range, so when you place the order, let me know your desired central. Also usually we need about 15 days to produce the antenna. Install the supplied hardware exactly as shown in the photo.Colored markers on each dipole indicate upward direction. Accordingly, the drainage holes at the end of the antennas should point downward. All vibrators must be installed strictly on the same line and in the same plane below each other at an appropriate distance. To calculate the vertical distance in meters, between the centers of the dipoles, it is necessary to multiply the wavelength of the transmission frequency by 5/8 or 0.625. The wavelength can be calculated by dividing 300 by the frequency in MHz. The horizontal distance between the mast and the center of the dipole is chosen equal from 1/4 to 1/2 of the wavelength of the transmission frequency, depending on the required diagram in the horizontal plane. The mast on which the antenna is installed must be no lower than the upper edge of the upper dipole. The antenna mast must be grounded. If you have any questions about the assembly and installation of the antenna, please contact me. The item "UHF Antenna, 4-element folded dipole array 400-470 MHz, 9 DBd 300W" is in sale since Tuesday, December 1, 2020. This item is in the category "Consumer Electronics\Radio Communication\Antennas\Ham, Amateur Radio Antennas". The seller is "odessadmitry" and is located in Odessa. This item can be shipped worldwide.