Antenna's

Ok then if a two way amp says it has 17db of gain how does that come into the picture. Thanks Ed

It means it has a gain of 17db on receive side and a 17db gain on the transmit side. So a 10mw transmit signal before it goes into the amp will be about

450mw (guestimate) coming out. Same on the receive side except most likely a much much smaller signal level.

matching

AFAIK The gain wouldnt be 26db... as what you may think, the gain is logorithic, so ***guess*** an extra 3db gain would be achived over the

13db...= 1 signal point more gain over a single antenna.. as long as BELOW is true

it would need a proper feeder to the two antennas so that the matching (ohms) is kept to the correct ohmage: ie 50

HubSwitch

A 13dB antenna means that it receives in some direction 13dB "louder" than whatever standard antenna to which it is being compared. If you were to change the antennas at both ends of the path from those standard antennas to the 13dB antennas, then the improvement in the radio link will be 26dB.

Antenna gain is not magic, a 13 dB improvement over some standard antenna comes about only from a reduction in signals in other directions. The gain figure is simply a measure of its directivity, and if the signal got

13dB louder in some direction it also got weaker in other directions.

Tony