F/B (Front to Back Ratio)
Posted: Thu Jul 15, 2004 1:24 pm
This ratio tells how good the antenna is at rejecting signals from the rear. It is seldom truly important because interference seldom comes from the rear, but it can happen. This ratio is the gain factor in the forward direction divided by the gain factor from the rearward direction. But since gains and F/B ratios are usually given in dB, you normally get the F/B figure by subtracting the rearward gain from the forward gain (both in dB).
The F/B ratio is mostly a marketing tool, and is not a very useful number. The true ratio often varies dramatically from channel to channel. Respectable antenna texts don
The F/B ratio is mostly a marketing tool, and is not a very useful number. The true ratio often varies dramatically from channel to channel. Respectable antenna texts don