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Using a cordless phone's omni antenna for wifi application & about cable impedance

 
 
Wiseman
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      04-28-2005, 06:10 AM
Hi,

I've got a few omni directional antennas that were used for 254/380 MHz
cordless phones and would like to know if they are frequency specific or if
it is possible to use them for wifi 2.4 GHz applications. They've got three
horizontal spokes spaced by 120 degrees at the base. I opened one of the
antennas and inside there is only one long copper wire.

As with my second question, I wanted to know if the cable that came with
these cordless phones can be used for wifi. The cable is thinner than the
LMR400 but when the gear was in service I could easy get signal up to 10
kilometres. Of course the base set had 15 watts and the handset had 4 watts,
very huge by wifi standards !

The main thing about the cable is to know if by putting two cable lengths in
parallel I can improve the signal for wifi. In my electronics classes I
learnt that by putting two resistances in series the total resulting
resistance is the sum of the two while if you install two of them in
parallel
the resulting resistance is smaller than the smaller of the resistance. I
don't know if the formula applies to cable impedance. If it does, then
putting two cables in parallel would have an impedance of less than 50 ohms
which may damage the wifi gear as they need a load of 50 ohm.

I know it's easier to buy new accessories, but if we can learn by
experimenting it could very interesting.

Any opinions will be appreciated.

Regards.

Wiseman



 
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ken reynolds
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      04-28-2005, 10:14 PM
Hi
All antennas are frequency specific,so your phone ones are no use for wifi .
Cables have a number of characteristics ,impedence is only one, and should
be matched to the equipment at each end of the cable for maximum signal
transfer.,running two cables in parallel wil not help with radio
signals.TANSTAFL
Ken Reynolds
..


 
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William P. N. Smith
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      04-29-2005, 11:19 AM
"Wiseman" <(E-Mail Removed)> wrote:
>I've got a few omni directional antennas that were used for 254/380 MHz
>cordless phones and would like to know if they are frequency specific or if
>it is possible to use them for wifi 2.4 GHz applications.


I'd be real surprised if they worked at all at 10X the frequency...

>As with my second question, I wanted to know if the cable that came with
>these cordless phones can be used for wifi.


Ditto.

>The main thing about the cable is to know if by putting two cable lengths in
>parallel I can improve the signal for wifi.


You'd have a 25 ohm impedance, which wouldn't ruin anything, but
wouldn't work very well either.

 
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