305 BROADCAST AKG/7F User Manual Download | Manualshive

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305 Br

oad

cast AK

G/7

N,

M, F

User Manual

Circular Polarization

FM Antenna

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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Summary of Contents for AKG/7F

Page 1: ...nual Circular Polarization FM Antenna 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 ...

Page 2: ...OWER ANTENNA ANTENNAS DB WEIGHT BAYS n rs 1 1 1 1 1 1 1 5 1 5 4 5 6 7 5 1 4 1 4 3 4 6 1 8 mt s 4 3 mt s 9 3 mt s 14 3 mt s 19 3 mt s 9 18 36 54 72 2 4 6 8 Bays Gain Gain Aperture kgs These wide band FM antennas made of Stainless Steel are particularly recommended for medium Output Power Transmitters ...

Page 3: ... DISTANCE ESTIMATION BETWEEN FM ANTENNA BAYS Wave Length λ 300 f MHz Distance between antenna bays any antenna types d d suggested λ x 0 85 88MHz λ 300 88 3 41 mt d 3 41 x 0 85 2 9 mt 98MHz 300 98 3 06 mt d 3 06 x 0 85 2 6 mt 108MHz 300 108 2 78 mt d 2 78 x 0 85 2 36 mt Distance d suggested 2 5 2 6mt even if working frequency is 88MHz or 108MHz FM Antenna User Manual λ λ ...

Page 4: ...pay attention to follow the A B C D letters After inserting the elements lock nuts lightly Insert the central link and lock it to the inner brass conductor coming out from the central insulator Lock strongly all the nuts Lock the antenna to the mast at the distance indicated from the lines Protect the connector with appropriate tape Using an array of 2 or more dipoles it s necessary to calculate t...

Page 5: ...ter than 2 0 1 may be unsatisfactory Some technicians will refer to match as Return Loss in which case rates of 14 dB or 12 dB apply Performance at a R L of less than 9 dB may be unsatisfactory 1 What is the VSWR you have measured Check to see that it has been properly calibrated and that any connector adaptors are of good quality A poorly matched adaptor will invalidate the results 2 What test eq...

Page 6: ...chart This is a crude method If the antenna is of relatively new and the model number is known the factory may still have the production test data sheet which will identify its frequency by Serial Number 4 What is your operational frequency 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 t...

Page 7: ...fective If the second one yields the same bad result the problem is unlikely to be the antenna Perhaps the transmitter is not operating on the expected frequency Substitution of a dummy load is an option if a second antenna is not available but the test is less meaningful because it is actually testing only the cable 7 Did you have the opportunity to substitute an identical antenna It could either...

Page 8: ...e can drastically affect performance and is not covered by warranty 9 Are the antenna drain holes open It is a good idea to shake the antenna during the above tests to ensure there are no mechanical intermittence Poor connections may lead to RF intermodulation products Water entering the antenna may lead to electrical intermittence which subside when the antenna dries out 10 Is the antenna intermi...

Page 9: ...stitution with an identical unit of known quality is the method of choice when a defective product is suspected The typical VSWR for a good antenna is 1 5 1 Although some site engineers may specify a minimum acceptable value of 1 3 1 there is only a minuscule improvement For example at 1 5 1 ratio 4 0 of the power is reflected back creating a 0 18 dB loss At a1 3 1 ratio 1 7 is reflected resulting...

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