Summary of Contents for 305 BROADCAST AKG/7N
- Page 1 Circular Polarization FM Antenna User Manual This manual provides important guidelines for installing. Review this information carefully for proper installation. Both unit specifications and manual contents are subject to change without notice.
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Page 2: Mounting Instructions
FM Antenna User Manual MOUNTING INSTRUCTIONS These wide band FM antennas, made of Stainless Steel are particularly recommended for medium Output Power Transmitters. BAYS ANTENNAS POWER WEIGHT ANTENNA n.rs Bays Gain Gain Aperture kgs. -1.5 -1.4 1,8 mt.s 4,3 mt.s 9,3 mt.s 14,3 mt.s 19,3 mt.s... - Page 3 FM Antenna User Manual SUGGESTED MAST SECTION Is suggested install this Antenna over poles or guyed mast because the section higher than 110mm. DISTANCE ESTIMATION BETWEEN FM ANTENNA BAYS Wave Length = = 300 : f(MHz) λ Distance between antenna bays (any antenna types) = d d (suggested) = x 0.85 λ...
- Page 4 FM Antenna User Manual MOUNTING INSTRUCTIONS AKG/7 The antenna must be assembled with the central insulator down. The elements without the hole must be mounted looking to the high while the elements with the hole must be mounting looking down. The elements with the hole have different length and for this reason have been marked with different letters , pay attention to follow the A- B - C - D letters.
- Page 5 FM Antenna User Manual Some Criteria For Evaluating Antennas Complaints about High Reflected Power, High VSWR, or Poor Match all mean the same thing. The antenna does not appear to be absorbing as much power from the transmitter as it should. It must be determined whether the installation or the product is the cause.
- Page 6 FM Antenna User Manual Some Criteria For Evaluating Antennas b. Network Analyzer/Spectrum Analyzer with Tracking Generator? (These devices do not rely upon the site’s transmitter as a signal source. They can produce more accurate and meaningful results but do not subject the antenna to full power where arcing or flashover would occur).
- Page 7 FM Antenna User Manual Some Criteria For Evaluating Antennas 5. Did you measure the antenna erect , free and clear of metal objects? Side mounting too close to the tower can detune an antenna. The required spacing distance between the antenna and any other metal object decreases as the operational frequency increases.
- Page 8 FM Antenna User Manual Some Criteria For Evaluating Antennas 9. Are the antenna drain holes open? They are placed at the bottom of the antenna for draining internal moisture. Periodic inspection of these openings is the responsibility of the owner. They must remain clear of debris to preclude corrosion from internal condensation.
- Page 9 FM Antenna User Manual Some Criteria For Evaluating Antennas Notes Match is only one indicator of antenna quality. VSWR tells us how well the product’s impedance matches to (absorbs) a transmitters signal, and is easy to measure in the field. Unfortunately, VSWR does not reveal an antenna’s efficiency (how well it radiates the signal).
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