Telstra CDMA towers

I saw some guys on a cherry picker yesterday replacing the CDMA antennas
on the Telstra tower near Cadbuy's in Ringwood (Vic). I think someone in
the newsgroup once said that they're doing this because the new antennas
are mid range antennas. Why can't they simply use the exisitng antennas
but crank it down a bit? What's the purpose of the new antennas?

Graham.

"Graham" <grahamc@fastmail.com.au> wrote in message
news:pan.2005.03.11.15.00.14.735961@fastmail.com.a u...

> Why can't they simply use the exisitng antennas
> but crank it down a bit? What's the purpose of the new antennas?

Changes the radiation pattern.

"Brendon" <no@way.man> wrote in message
news:42313fab$0$31169$61c65585@un-2park-reader-02.sydney.pipenetworks.com.au...
> "Graham" <grahamc@fastmail.com.au> wrote in message
> news:pan.2005.03.11.15.00.14.735961@fastmail.com.a u...
>
> > Why can't they simply use the exisitng antennas
> > but crank it down a bit? What's the purpose of the new antennas?

Probably replacing omnidirectional with directional

Michael wrote:
>
> Probably replacing omnidirectional with directional


Or reducing the gain on the directional cells, my local BTS started off
with CDMA omnis, went directional then not so long ago replaced those
antennas with newer ones. Needless to say quite a lot of the local CDMA
gaps have been plugged by co-locating on T-GSM Microcells.


Albinus.

"Albinus" <albinus@spam-this.com> wrote in message
news:423187a5$0$5190$afc38c87@news.optusnet.com.au ...
> Michael wrote:
> >
> > Probably replacing omnidirectional with directional
>
>
> Or reducing the gain on the directional cells, my local BTS started off
> with CDMA omnis, went directional then not so long ago replaced those
> antennas with newer ones. Needless to say quite a lot of the local CDMA
> gaps have been plugged by co-locating on T-GSM Microcells.

A lot which now have WiFi on them