Where to Get Full Power Access Point

In the UK max Power is 100mW. I am yet to find one that actually has an EIRP
of 100mW. Most are 16dBm (40mW) with 2dBi antennas.

Does anyone do one that actually transmits 100mW? I want to get a decent
range in a Bath Stone house

TheDragon wrote:
> In the UK max Power is 100mW. I am yet to find one that actually has an EIRP
> of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>
> Does anyone do one that actually transmits 100mW? I want to get a decent
> range in a Bath Stone house


Look at the link to Demarctech in my post in the thread
"Satellite to Outbuildings" from yesterday. They go that high and a lot
more.

TheDragon wrote:
> In the UK max Power is 100mW. I am yet to find one that actually has an EIRP
> of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>
> Does anyone do one that actually transmits 100mW? I want to get a decent
> range in a Bath Stone house
>
>
Linksys WRT54G can do it with the proper firmware.

Mads Bahrt wrote:

> TheDragon wrote:
>
>> In the UK max Power is 100mW. I am yet to find one that actually has
>> an EIRP of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>>
>> Does anyone do one that actually transmits 100mW? I want to get a
>> decent range in a Bath Stone house
>>
> Linksys WRT54G can do it with the proper firmware.
But you should be aware that you will need an equally powerfull access
point - the connection needs to be both ways.

Mads Bahrt wrote:

> Mads Bahrt wrote:
>
>> TheDragon wrote:
>>
>>> In the UK max Power is 100mW. I am yet to find one that actually has
>>> an EIRP of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>>>
>>> Does anyone do one that actually transmits 100mW? I want to get a
>>> decent range in a Bath Stone house
>>>
>> Linksys WRT54G can do it with the proper firmware.
> But you should be aware that you will need an equally powerfull access
> point - the connection needs to be both ways.
>

Not necessarily true. the connection needs to be both ways, but just as
some transmitters are more powerful than others so some receivers are
more sensitive. If the router has a more sensitive receiver than the
other device then it may be capable of receiving a much weaker signal
than the device at the other end of the connection. In that case
increasing the router power may increase range.

I don't know how the receiver sensitivities compare, but it would not
suprise me at all if the WRT54G had a much better receiver than a
typical laptop card. A Google search finds comments such as:

"Initial tests show a much higher RX sensitivity than most cards"

or:

"The little Linksys WRT54G box is a terrific generic Linux platform to
run just about any networking code on. I have found that the radio on it
when cranked up to its full 84mw is better than any of my pcmcia cards
including the 100mw Cisco-350 I normally use when I need to pick up some
distant signal. I have this 5dbi Maxrad antenna I normally use with the
Cisco card and even with that it doesn't match the sensitivity of the
WRT54G with the stock antennas."

"Duncan Booth" <(E-Mail Removed)> wrote in message
news:Xns96229F619B08duncanrcpcouk@127.0.0.1...
> Mads Bahrt wrote:
>
>> Mads Bahrt wrote:
>>
>>> TheDragon wrote:
>>>
>>>> In the UK max Power is 100mW. I am yet to find one that actually has
>>>> an EIRP of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>>>>
>>>> Does anyone do one that actually transmits 100mW? I want to get a
>>>> decent range in a Bath Stone house
>>>>
>>> Linksys WRT54G can do it with the proper firmware.
>> But you should be aware that you will need an equally powerfull access
>> point - the connection needs to be both ways.
>>
>
> Not necessarily true. the connection needs to be both ways, but just as
> some transmitters are more powerful than others so some receivers are
> more sensitive. If the router has a more sensitive receiver than the
> other device then it may be capable of receiving a much weaker signal
> than the device at the other end of the connection. In that case
> increasing the router power may increase range.
>
> I don't know how the receiver sensitivities compare, but it would not
> suprise me at all if the WRT54G had a much better receiver than a
> typical laptop card. A Google search finds comments such as:
>
> "Initial tests show a much higher RX sensitivity than most cards"
>
> or:
>
> "The little Linksys WRT54G box is a terrific generic Linux platform to
> run just about any networking code on. I have found that the radio on it
> when cranked up to its full 84mw is better than any of my pcmcia cards
> including the 100mw Cisco-350 I normally use when I need to pick up some
> distant signal. I have this 5dbi Maxrad antenna I normally use with the
> Cisco card and even with that it doesn't match the sensitivity of the
> WRT54G with the stock antennas."
>

Many thanks for these links, I did see your thread on the 500mW variant AP,
however at $799 its a bit pricy.

The Link SYS looks good, also looking at www.signal-seeker.com looks pretty
good, If its claims are correct

On 23 Mar 2005 15:42:50 GMT, Duncan Booth
<(E-Mail Removed)> wrote:

>Not necessarily true. the connection needs to be both ways, but just as
>some transmitters are more powerful than others so some receivers are
>more sensitive. If the router has a more sensitive receiver than the
>other device then it may be capable of receiving a much weaker signal
>than the device at the other end of the connection. In that case
>increasing the router power may increase range.
>
>I don't know how the receiver sensitivities compare, but it would not
>suprise me at all if the WRT54G had a much better receiver than a
>typical laptop card.

This might help:
http://freenetworks.org/moin/index.c...iveSensitivity


>A Google search finds comments such as:
>"Initial tests show a much higher RX sensitivity than most cards"

Sigh. I kinda like numbers. I especially like numbers that are
reproduceable. I *REALLY* like numbers that came from proper bench
tests, using standardized proceedures, and calibrated equipment.
I'll even tolerate wrong numbers as long as they're consistantly wrong
in the same reproduceable way.

>"The little Linksys WRT54G box is a terrific generic Linux platform to
>run just about any networking code on. I have found that the radio on it
>when cranked up to its full 84mw is better than any of my pcmcia cards
>including the 100mw Cisco-350 I normally use when I need to pick up some
>distant signal. I have this 5dbi Maxrad antenna I normally use with the
>Cisco card and even with that it doesn't match the sensitivity of the
>WRT54G with the stock antennas."

I've found that the measured sensitivity of most receivers using a
given chipset are about the same at a given speed and modulation.
What makes a difference is the obstacle course of circuit board
traces, connectors, adapters, test switches, pigtails, and coax. Such
losses vary between perhaps 1dB for receivers with very little between
the receiver and the antenna, and 5dB for some rats nests with lossy
circuit boards. To put it in perspective, 6dB loss cuts your range in
half.

However, the biggest effect is from board and chip layout noise. The
way sensitivity is measured is by sending random data and measuring
either the bit error rate (BER), or the packet error rate (PER). They
are related but not neatly. It's easiest to measure PER. For OFDM,
10% PER is commonly used. That's 10% of all packets sent (at the MAC
level) arrive with errors. All of these errors come from normal
receiver noise, but there are ways to make things worse. Rotten board
layout, excessive noise coupling across the chips, and locally
generated garbage all add noise which will affect the sensitivity.

Of course, field testing is the ultimate determination. However,
there's a problem. There's no easy way to do a one-way receiver field
test. One could put an overwhelmingly strong transmitter at the
receiver under test, and assume that the other end will always hear
the acks. However, most test are done with the 4 unknowns (2
xmitters, 2 receivers). One never knows which end craps out first, or
whether the transmitter or receiver is lacking. There are plenty of
other error sources in field tests limited by the test location. For
example, some receivers are more/less sensitive to reflections and
multipath. If the test were conducted "down the street", reflections
off the road will cause all manner of erratic results.


--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558

TheDragon wrote:
> Many thanks for these links, I did see your thread on the 500mW
variant AP,
> however at $799 its a bit pricy.
>
> The Link SYS looks good, also looking at www.signal-seeker.com looks pretty
> good, If its claims are correct

For clarity's sake, assuming you were referring to my post, I wasn't
talking about one of the $800 AP's, it was $179. And Ed Williams' Signal
Seeker may very well be a good or even the best solution, but he's
reluctant to describe the product in actual specifications instead of
advertising lingo. He has offered one to a senior "member" of the group
for testing, but I've not seen the offer go anywhere yet.

Note to Ed: all your picture links are broken except the main one on
your eBay ad. Might want to check on that.

Mads Bahrt <(E-Mail Removed)> wrote in
news:d1rvb6$15r$(E-Mail Removed):

> TheDragon wrote:
>> In the UK max Power is 100mW. I am yet to find one that actually has
>> an EIRP of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>>
>> Does anyone do one that actually transmits 100mW? I want to get a
>> decent range in a Bath Stone house
>>
>>
> Linksys WRT54G can do it with the proper firmware.
>

The WRT54GS is probably a better choice since it has more Flash Memory and
RAM.

You can raise the transmit power on both the WRT54G and GS model to 251mw!

--
Lucas Tam ((E-Mail Removed))
Please delete "REMOVE" from the e-mail address when replying.
http://members.ebay.com/aboutme/coolspot18/

"Lucas Tam" <(E-Mail Removed)> wrote in message
news:Xns962362FC1CE2nntprogerscom@127.0.0.1...
> Mads Bahrt <(E-Mail Removed)> wrote in
> news:d1rvb6$15r$(E-Mail Removed):
>
>> TheDragon wrote:
>>> In the UK max Power is 100mW. I am yet to find one that actually has
>>> an EIRP of 100mW. Most are 16dBm (40mW) with 2dBi antennas.
>>>
>>> Does anyone do one that actually transmits 100mW? I want to get a
>>> decent range in a Bath Stone house
>>>
>>>
>> Linksys WRT54G can do it with the proper firmware.
>>
>
> The WRT54GS is probably a better choice since it has more Flash Memory and
> RAM.
>
> You can raise the transmit power on both the WRT54G and GS model to 251mw!
>
> --
> Lucas Tam ((E-Mail Removed))
> Please delete "REMOVE" from the e-mail address when replying.
> http://members.ebay.com/aboutme/coolspot18/

WOW 251mW is a lot of power in the UK, Infact with a 3dBi antenna its a
whole 400mW too much. I like it.