Antenna's

Say you have two 13db panel antenna's. If I would couple them together would
the gain double.
Thanks Ed

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


"Ed Williams" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Say you have two 13db panel antenna's. If I would couple them together
would
> the gain double.
> Thanks Ed
>
>

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

"HubSwitch" <(E-Mail Removed)> wrote in message
news:cs6754$bov$(E-Mail Removed)...
> 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
>
>
> "Ed Williams" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Say you have two 13db panel antenna's. If I would couple them together
> would
>> the gain double.
>> Thanks Ed
>>
>>
>
>

"Ed Williams" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> 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.






>
> "HubSwitch" <(E-Mail Removed)> wrote in message
> news:cs6754$bov$(E-Mail Removed)...
> > 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
> >
> >
> > "Ed Williams" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> >> Say you have two 13db panel antenna's. If I would couple them
together
> > would
> >> the gain double.
> >> Thanks Ed
> >>
> >>
> >
> >
>
>

On Thu, 13 Jan 2005 09:54:16 -0500, "Ed Williams" <(E-Mail Removed)> wrote:

> Say you have two 13db panel antenna's. If I would couple them together would
> the gain double.

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