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#9
July 4th 07, 02:56 PM
posted to rec.radio.amateur.antenna,alt.tv.tech.hdtv
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Front-to-back ratio for UHF antenna
"Bishoop" wrote in message ... snip 10 or 12 db of forward gain means your recieved signal is about 10 to 16 times as strong as a dipole hanging in the air. If you interpret the negative number as the amount the signal is down from the forward gain, the numbers given (9 to 17db) would indicate reception off the back side would be somewhere near a dipole in open space (1 db net) to -5db (about 1/3 of the signal of a dipole) pickup from the back. I have used aluminum sheet (tested prior with aluminum foil) tied to the mesh to completely block reception from the back (a near infinite front to back ratio) in an extreme case where I had significant multipath reflections coming in from the back. It really cleaned things up. In your case you may not need to go to this rather severe step. snip Good luck! --Rick AH7H 10 or 12db of forward gain goes NOT equal 10 "times" the received signal strength. Then what do you think it is equal to ? |
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