Sign in with
Sign up | Sign in
Your question

WRT54G - Power (transmit) output adjust.

Last response: in Wireless Networking
Share
Anonymous
a b F Wireless
June 18, 2004 12:11:40 AM

Archived from groups: alt.internet.wireless (More info?)

Is there a way to lower the AP's output signal?
I want to limit the wireless range.

I've read that the WRT54G puts out 19mW. I want
to know if 15 or even 10 mW would suffice.

I've also tried to use small home-made
antennas (www.freeantennas.com) but it tends to
do the opposite - increase directional power.

Any ideas?
Anonymous
a b F Wireless
June 18, 2004 12:11:41 AM

Archived from groups: alt.internet.wireless (More info?)

On Thu, 17 Jun 2004 20:11:40 GMT, MP wrote:

> Is there a way to lower the AP's output signal?
> I want to limit the wireless range.
>
> I've read that the WRT54G puts out 19mW. I want
> to know if 15 or even 10 mW would suffice.
>
> I've also tried to use small home-made
> antennas (www.freeantennas.com) but it tends to
> do the opposite - increase directional power.
>
> Any ideas?

I'd be curious as to other's reactions to it, but I'd try to put two soup
cans over the antennae, cut enough holes in it to get a connection, then
stop cutting. If heat build up is a problem, cut a hole in the top. You can
use a piece of styrofoam in each can to help keep them positioned well.

There were some hacks to lower the power output of the old Linksys WAP11,
but I prefer to leave the unit intact. If there are network problems down
the road, you don't have to worry about whether your hacks are part of the
cause.

--
Barry
Anonymous
a b F Wireless
June 18, 2004 12:11:41 AM

Archived from groups: alt.internet.wireless (More info?)

Sveasoft makes firmware which makes the (WRT54G) power output adjustable.

"MP" <marioparent@cogeco.ca> wrote in message
news:Xns950BA4BD997B8123abcorg@216.221.81.119...
> Is there a way to lower the AP's output signal?
> I want to limit the wireless range.
>
> I've read that the WRT54G puts out 19mW. I want
> to know if 15 or even 10 mW would suffice.
>
> I've also tried to use small home-made
> antennas (www.freeantennas.com) but it tends to
> do the opposite - increase directional power.
>
> Any ideas?


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.707 / Virus Database: 463 - Release Date: 6/15/2004
Related resources
Anonymous
a b F Wireless
June 18, 2004 2:37:55 AM

Archived from groups: alt.internet.wireless (More info?)

In article <Xns950BA4BD997B8123abcorg@216.221.81.119>,
marioparent@cogeco.ca says...
> Is there a way to lower the AP's output signal?
> I want to limit the wireless range.
>
> I've read that the WRT54G puts out 19mW. I want
> to know if 15 or even 10 mW would suffice.
>
> I've also tried to use small home-made
> antennas (www.freeantennas.com) but it tends to
> do the opposite - increase directional power.
>
> Any ideas?
>
The easiest (and best IMHO) is to flash the router with the code from
wifibox.net ( Firmware Version: v2.00.8
Wifi-box.net Release Version: 2.00.8.1i-pre6.wfb 22/01/2004 ) which
allows you to increase and decrease output power. Plus it give you some
very nice other features.
Jim
--
Jim Sanchez - Bellevue WA
JH_Sanchez AT hotmail.com
June 18, 2004 3:26:12 AM

Archived from groups: alt.internet.wireless (More info?)

MP <marioparent@cogeco.ca> wrote:

> I've read that the WRT54G puts out 19mW. I want
> to know if 15 or even 10 mW would suffice.

If that were the case you would not be able to get any signal anywhere!
You probably are mixing mw and dbm.

The output is somewhere between 64 and 84 mw.

Why would you want to limit output where everybody is trying yo
iincrease output?

--
Groeten,

Antonio (Voor email, verwijder X)
Anonymous
a b F Wireless
June 18, 2004 3:30:50 PM

Archived from groups: alt.internet.wireless (More info?)

AnToNio wrote:

> If that were the case you would not be able to get any signal anywhere!
> You probably are mixing mw and dbm.
>
> The output is somewhere between 64 and 84 mw.

This is not right, in my router (WRT54G DE) the default antenna power is
set to 18mW. After a firmware update with
http://www.f4.fhtw-berlin.de/~s0503018/Satori_v2_2.00.8...
you can increase or decrease the power.
June 18, 2004 6:29:18 PM

Archived from groups: alt.internet.wireless (More info?)

Vitali Esau <vitali.esau@sap.com> wrote:

> This is not right, in my router (WRT54G DE) the default antenna power is
> set to 18mW. After a firmware update with

Incorrect!!

Like I said, you are mixing dbm and mw, which are 2 totally different
thing. 100 mw is about same as 20 dbm.

Below, the email I got from Linksys when I needed to know exact numbers:

=======================================
Thank you for contacting Linksys Technical Support.

Model Number RF Output Power (dBm)

1. WRT54G v2 18dBm
2. WRT54G v1.1 15dBm
3. BEFW11S4 v4 15dBm

Should you have further clarification, don't hesitate to email me back.

If you have further questions, please contact us at (800) 326-7114 or
send us an email at support@linksys.com so that we may further assist
you. Please use this phone number given as reference for future support
calls.

Have a pleasant day!


Sincerely,

Aldrin S. Casas
Linksys – A Division of Cisco Systems, Inc.
Product Support Specialist
800-326-7114
support@linksys.com


--
Groeten,

Antonio (Voor email, verwijder X)
Anonymous
a b F Wireless
June 21, 2004 4:55:48 PM

Archived from groups: alt.internet.wireless (More info?)

AnToNio wrote:

> Vitali Esau <vitali.esau@sap.com> wrote:
>
>
>>This is not right, in my router (WRT54G DE) the default antenna power is
>>set to 18mW. After a firmware update with
>
>
> Incorrect!!
>
> Like I said, you are mixing dbm and mw, which are 2 totally different
> thing. 100 mw is about same as 20 dbm.

Hi,
I didn't formulate correctly. Here a second try:
There are two different output power values we talked about. There is an
internal transmitting power of the router (which I talked about) and a
total transmitting power (which you talked about). The total
transmitting power is calculated like this:
(Linsys approximate values)
internal transmitting power of the router (18,0 mW ~ 12,6 dBm)
-
cable and ports losses ( ~ 4 dBm )
+
antenna gain ( ~ 9 dBm)
_______________________________________________________
total transmitting power (63,1 mW ~ 18,0 dBm)

So I talked about the internal transmitting power, wich you can change
after the firmware update.

Best regards
Vitali
Anonymous
a b F Wireless
June 21, 2004 5:21:27 PM

Archived from groups: alt.internet.wireless (More info?)

Thanks for everyone's help!

I managed to download a firmware patch that allows me to
adjust the power output from the default of 28mW all the
way down to 2mW.

Using my Sony Clié with a built-in 802.11b interface, I
was able to quickly survey the range and got pretty
much the coverage I wanted without sacrificing in speed
over errors.

I'm doing more surveying today to tweek the AP.

Cheers everyone!


Vitali Esau <vitali.esau@sap.com> wrote in
news:cb6erk$skn$1@news1.wdf.sap-ag.de:

> AnToNio wrote:
>
>> Vitali Esau <vitali.esau@sap.com> wrote:
>>
>>
>>>This is not right, in my router (WRT54G DE) the default antenna power
>>>is set to 18mW. After a firmware update with
>>
>>
>> Incorrect!!
>>
>> Like I said, you are mixing dbm and mw, which are 2 totally different
>> thing. 100 mw is about same as 20 dbm.
>
> Hi,
> I didn't formulate correctly. Here a second try:
> There are two different output power values we talked about. There is
> an internal transmitting power of the router (which I talked about)
> and a total transmitting power (which you talked about). The total
> transmitting power is calculated like this:
> (Linsys approximate values)
> internal transmitting power of the router (18,0 mW ~ 12,6 dBm)
> -
> cable and ports losses ( ~ 4 dBm )
> +
> antenna gain ( ~ 9 dBm)
> _______________________________________________________
> total transmitting power (63,1 mW ~ 18,0 dBm)
>
> So I talked about the internal transmitting power, wich you can change
> after the firmware update.
>
> Best regards
> Vitali
>
Anonymous
a b F Wireless
June 21, 2004 6:21:15 PM

Archived from groups: alt.internet.wireless (More info?)

Vitali Esau wrote:

> So I talked about the internal transmitting power, wich you can change
> after the firmware update.
You can for example look at: http://www.zytrax.com/tech/wireless/calc.htm

>
> Best regards
> Vitali
>
June 21, 2004 7:45:38 PM

Archived from groups: alt.internet.wireless (More info?)

Vitali Esau <vitali.esau@sap.com> wrote:

> There is an
> internal transmitting power of the router (which I talked about) and a
> total transmitting power (which you talked about). The total
> transmitting power is calculated like this:

Untrue!

If you start internally with 18 mw then you will never be able to
transmit more than 18 mw. Worse even, it will always be less. The only
gain you can reach with the antenna is that of bundling all power into a
small direction instead of transmitting all around.

The 18 dbm (Linksys figure) is aproximately 84 mw and believe it or not
it is absolutely impossible to get an almost 5-fold increase by any(!)
antenna. The antenna is only able to limit the region it sends and
thereby limiting the spreading its power.


--
Groeten,

Antonio (Voor email, verwijder X)
Anonymous
a b F Wireless
June 22, 2004 12:35:13 AM

Archived from groups: alt.internet.wireless (More info?)

antoniongXXX@zonnet.nl (AnToNio) wrote:
>it is absolutely impossible to get an almost 5-fold increase by any(!)
>antenna.

A 20dB antenna will give you an ERP in the direction of interest of
100 times the input power. There are plenty of 24dB gain antennas...

--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com
June 22, 2004 3:07:15 PM

Archived from groups: alt.internet.wireless (More info?)

<William> wrote:

> A 20dB antenna will give you an ERP in the direction of interest of
> 100 times the input power. There are plenty of 24dB gain antennas...

And that increased power will ONLY exist in a small sirection where at
the same time other direction will have nil. All that these antennas do
is bundling the total power and send into a small direction.

Compare it with mobile TV transmitters, the parabole bundles the signal
into a rather small beam and a bit besides that beam there is no signal
at all.


--
Groeten,

Antonio (Voor email, verwijder X)
!