[MKT]

Hi all..

What will happen when….

CASE-1

You have a 900 band TRX but you put a 1800 band carrier on it.
Will there be any radiation from Antenna?

CASE-2

Vice versa ..1800 TRX and you put 900 carrier over it this time.

CASE-3

You have a 900 band signal. But you put it into the port(s) of 1800 at your TRI-band antenna.
will there be any radition ??

Some says that if you put a 900 signal into a 1800 antenna… it works fine but with a reduced coverage?? That is dangerous I think…

Regards…..
MKT

[Pix]

MKT,

case 1
Impossible in alcatel systems, the TRX band gives the list of frequencies you can choose, during frequency allocation.

case 2
same thing

case 3
there will be radiations, but weaker. The pattern might eventually be modified as well.

The dipoles of your antenna are the size of the wavelength / 2. So putting 900 into 1800 dipoles is possible : the dipoles are wavelength / 4 -> still proportional to the frequency.

But the pattern will be modified accordingly, and I suspect the gain will be lessen (probably divided by 2, as far as i recall).

And it is not dangerous. It is never dangerous 🙂 electomagnetic waves will always find a way to the air (“freedom !” i heard them say, sometimes), and they’re never going to blow up anything.

[Author]

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