JeB <no@spam.org> wrote:
> On 22 May 2007 23:07:00 GMT, carleeniet@yazoo.com wrote:
>
> >My laptop seems to connect to my Linksys router much stronger when
> >I switch the router to channel 11 from 6. Does this make sense? TIA
>
> one possible explanation is that there is less interference on that
> channel.
I thought about that but I am new to this and you guys are the
the experts here. Thank you for the reply.
<carleeniet@yazoo.com> wrote in message
news:20070522212830.117$mS@newsreader.com...
> JeB <no@spam.org> wrote:
>> On 22 May 2007 23:07:00 GMT, carleeniet@yazoo.com wrote:
>>
>> >My laptop seems to connect to my Linksys router much stronger when
>> >I switch the router to channel 11 from 6. Does this make sense? TIA
>>
>> one possible explanation is that there is less interference on that
>> channel.
>
> I thought about that but I am new to this and you guys are the
> the experts here. Thank you for the reply.
>
Everyones circumstances are different.
Thank you for reporting your findings, it could definitely help someone
else.
>My laptop seems to connect to my Linksys router much stronger when
>I switch the router to channel 11 from 6. Does this make sense? TIA
Not really. How much stronger? What hardware? External aftermarket
antennas? Home made antennas?
Most very high gain (19-24dBi) antennas just barely have enough
bandwidth to cover the 83.5MHz width of the 2.4GHz band. Same with
some really tiny ceramic substrate 2.4GHz antennas. Typically, they
will have about a 3dB gain variation across the band. However, this
is not the case with typical 2dBi vertical coaxial and colinear
antennas which have more than adequate bandwidth. There are also
ceramic bandpass filters on the antenna connection of most access
points and some client adapters to reduce interference from adjacent
services. These are not all that flat across the band and do vary
with production lots. There is also usually a matching network
between the antenna and the PIN diode diversity switch, which can also
be frequency sensitive. In other words, there are plenty of
components that can cause differences in gain across the band.
For a good clue, search the FCC ID web site for your unspecified model
hardware and look at the test report. You'll see that the transmit
power varies somewhat across the band. The receiver sensitivity does
the same thing, but that's not in the report.
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> carleeniet@yazoo.com hath wroth:
>
> >My laptop seems to connect to my Linksys router much stronger when
> >I switch the router to channel 11 from 6. Does this make sense? TIA
>
> Not really. How much stronger? What hardware? External aftermarket
> antennas? Home made antennas?
>
> Most very high gain (19-24dBi) antennas just barely have enough
> bandwidth to cover the 83.5MHz width of the 2.4GHz band. Same with
> some really tiny ceramic substrate 2.4GHz antennas. Typically, they
> will have about a 3dB gain variation across the band. However, this
> is not the case with typical 2dBi vertical coaxial and colinear
> antennas which have more than adequate bandwidth. There are also
> ceramic bandpass filters on the antenna connection of most access
> points and some client adapters to reduce interference from adjacent
> services. These are not all that flat across the band and do vary
> with production lots. There is also usually a matching network
> between the antenna and the PIN diode diversity switch, which can also
> be frequency sensitive. In other words, there are plenty of
> components that can cause differences in gain across the band.
>
> For a good clue, search the FCC ID web site for your unspecified model
> hardware and look at the test report. You'll see that the transmit
> power varies somewhat across the band. The receiver sensitivity does
> the same thing, but that's not in the report.
I am using a Senoa PCMCIA card with the 2500 something chipset
and a 40 inch omni antenna purchased from Pasadena Wireless. It is
mounted on the roof with no structures in the way. The signal I am
speaking of is a Linksys router WRT54G and when it's on 6 windows
says the signal is low. On channel 11 it goes up to good but mostly
very good. I may not make sense but I am telling the truth.
Thanks for the input.
carleeniet@yazoo.com wrote:
> Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
>
>>carleeniet@yazoo.com hath wroth:
>>
>>
>>>My laptop seems to connect to my Linksys router much stronger when
>>>I switch the router to channel 11 from 6. Does this make sense? TIA
>>
>>Not really. How much stronger? What hardware? External aftermarket
>>antennas? Home made antennas?
>>
>>Most very high gain (19-24dBi) antennas just barely have enough
>>bandwidth to cover the 83.5MHz width of the 2.4GHz band. Same with
>>some really tiny ceramic substrate 2.4GHz antennas. Typically, they
>>will have about a 3dB gain variation across the band. However, this
>>is not the case with typical 2dBi vertical coaxial and colinear
>>antennas which have more than adequate bandwidth. There are also
>>ceramic bandpass filters on the antenna connection of most access
>>points and some client adapters to reduce interference from adjacent
>>services. These are not all that flat across the band and do vary
>>with production lots. There is also usually a matching network
>>between the antenna and the PIN diode diversity switch, which can also
>>be frequency sensitive. In other words, there are plenty of
>>components that can cause differences in gain across the band.
>>
>>For a good clue, search the FCC ID web site for your unspecified model
>>hardware and look at the test report. You'll see that the transmit
>>power varies somewhat across the band. The receiver sensitivity does
>>the same thing, but that's not in the report.
>
>
>
> I am using a Senoa PCMCIA card with the 2500 something chipset
> and a 40 inch omni antenna purchased from Pasadena Wireless. It is
> mounted on the roof with no structures in the way. The signal I am
> speaking of is a Linksys router WRT54G and when it's on 6 windows
> says the signal is low. On channel 11 it goes up to good but mostly
> very good. I may not make sense but I am telling the truth.
> Thanks for the input.
>
Hi,
Maybe the antenna is tuned to chnnel 11?
>I am using a Senoa PCMCIA card with the 2500 something chipset
>and a 40 inch omni antenna purchased from Pasadena Wireless.
A 40 inch long omni antenna is going to have a gain of about 10dBi.
That's fairly high gain for such an omni and will probably have a
correspondingly narrow bandwidth. I'm too lazy to search for all the
possible 40" long antennas carried by WlanParts. Is it one of these?
<http://www.wlanparts.com/category/antennas/>
Well, I got lucky. This one is 39" long:
<http://www.wlanparts.com/product/GP-24S>
Unfortunately, the data sheet does not include a gain vs frequency, or
VSWR vs frequency graph. Same problem on the Comet Antenna (NCG) web
pile.
Ok, so I have to do some guesswork. The VSWR of such an antenna is
probably fairly symmetrical across the band in free space. However,
when mounted improperly, such as too close to a tower, pipe, wall,
etc, the antenna changes resonance, usually going down in resonant
frequency. That's backwards for what you're seeing, so that's
probably not the problem.
That leaves the various filters, board traces, and matching systems in
your Senao wireless device. I can't tell how well those are working
without putting the radio on the bench. I have little experience with
Senao. However, I can assure you that other vendors products vary
substantially across the 83.5Mhz of the 2.4Ghz band. I can possibly
dig out some old test data if you're interested.
It also shows up in the test data. See the tx power data for the
Senao 2511 at:
<https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=229884&native_or_pdf=pd f>
in Page 13.
Channel Freq dBm Limit Pass/fail
1 2412 15.48 30 PASS
6 2437 15.00 30 PASS
11 2462 14.11 30 PASS
Note the 1.3dB difference in tx power output between channels 1 and
11. That's not very much, but that's under ideal conditions, without
the resonant effects of the antenna, bandpass filters, matching
networks, receiver, etc. This is also probably a hand tweaked unit.
>It is
>mounted on the roof with no structures in the way.
Ok, that eliminates any detuneing of the antenna by nearby metal.
Figure on staying about 10 wavelengths (125cm) away from the antenna.
>The signal I am
>speaking of is a Linksys router WRT54G and when it's on 6
Are you reading the signal strength on the WRT54G status page or on
the Senao wireless something or other?
Incidentally, some clients and AP's yield different signal strengths
when moving data than when at idle. That's because they like to
change data speed with and without data, which causes some differences
in indicated signal strength.
>windows
>says the signal is low.
Ok, so the mystery Senao device is plugged directly into a Windoze
computah. I don't suppose it would be particularly difficult for you
to identify what hardware you own?
>On channel 11 it goes up to good but mostly
>very good. I may not make sense but I am telling the truth.
>Thanks for the input.
There are too many variables to determine the culprit. I've seen
something similar with home made (or badly made) antennas and
equipment. It also happens with very badly built pigtails,
connectors, and adapters. Without a bench setup and a pile of test
equipment, it's difficult to isolate. The easiest way for you do
determine the culprit is to substitute parts and pieces of your
equipment and see if it also happens with other access points and
clients.
It seems to work pretty good compared to rubber duck type I
have used. Thanks for all of the input.
BTW, what is the best PCMCIA card? Is a 300mw better than my 200?
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> carleeniet@yazoo.com hath wroth:
>
> >I am using a Senoa PCMCIA card with the 2500 something chipset
> >and a 40 inch omni antenna purchased from Pasadena Wireless.
>
> A 40 inch long omni antenna is going to have a gain of about 10dBi.
> That's fairly high gain for such an omni and will probably have a
> correspondingly narrow bandwidth. I'm too lazy to search for all the
> possible 40" long antennas carried by WlanParts. Is it one of these?
> <http://www.wlanparts.com/category/antennas/>
> Well, I got lucky. This one is 39" long:
> <http://www.wlanparts.com/product/GP-24S>
> Unfortunately, the data sheet does not include a gain vs frequency, or
> VSWR vs frequency graph. Same problem on the Comet Antenna (NCG) web
> pile.
>
> Ok, so I have to do some guesswork. The VSWR of such an antenna is
> probably fairly symmetrical across the band in free space. However,
> when mounted improperly, such as too close to a tower, pipe, wall,
> etc, the antenna changes resonance, usually going down in resonant
> frequency. That's backwards for what you're seeing, so that's
> probably not the problem.
>
> That leaves the various filters, board traces, and matching systems in
> your Senao wireless device. I can't tell how well those are working
> without putting the radio on the bench. I have little experience with
> Senao. However, I can assure you that other vendors products vary
> substantially across the 83.5Mhz of the 2.4Ghz band. I can possibly
> dig out some old test data if you're interested.
>
> It also shows up in the test data. See the tx power data for the
> Senao 2511 at:
> <https://gullfoss2.fcc.gov/prod/oet/f...i?attachment_i
> d=229884&native_or_pdf=pdf> in Page 13.
> Channel Freq dBm Limit Pass/fail
> 1 2412 15.48 30 PASS
> 6 2437 15.00 30 PASS
> 11 2462 14.11 30 PASS
> Note the 1.3dB difference in tx power output between channels 1 and
> 11. That's not very much, but that's under ideal conditions, without
> the resonant effects of the antenna, bandpass filters, matching
> networks, receiver, etc. This is also probably a hand tweaked unit.
>
> >It is
> >mounted on the roof with no structures in the way.
>
> Ok, that eliminates any detuneing of the antenna by nearby metal.
> Figure on staying about 10 wavelengths (125cm) away from the antenna.
>
> >The signal I am
> >speaking of is a Linksys router WRT54G and when it's on 6
>
> Are you reading the signal strength on the WRT54G status page or on
> the Senao wireless something or other?
>
> Incidentally, some clients and AP's yield different signal strengths
> when moving data than when at idle. That's because they like to
> change data speed with and without data, which causes some differences
> in indicated signal strength.
>
> >windows
> >says the signal is low.
>
> Ok, so the mystery Senao device is plugged directly into a Windoze
> computah. I don't suppose it would be particularly difficult for you
> to identify what hardware you own?
>
> >On channel 11 it goes up to good but mostly
> >very good. I may not make sense but I am telling the truth.
> >Thanks for the input.
>
> There are too many variables to determine the culprit. I've seen
> something similar with home made (or badly made) antennas and
> equipment. It also happens with very badly built pigtails,
> connectors, and adapters. Without a bench setup and a pile of test
> equipment, it's difficult to isolate. The easiest way for you do
> determine the culprit is to substitute parts and pieces of your
> equipment and see if it also happens with other access points and
> clients.
Tony Hwang <dragon40@shaw.ca> wrote:
> carleeniet@yazoo.com wrote:
> > Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> >
> >>carleeniet@yazoo.com hath wroth:
> >>
> >>
> >>>My laptop seems to connect to my Linksys router much stronger when
> >>>I switch the router to channel 11 from 6. Does this make sense? TIA
> >>
> >>Not really. How much stronger? What hardware? External aftermarket
> >>antennas? Home made antennas?
> >>
> >>Most very high gain (19-24dBi) antennas just barely have enough
> >>bandwidth to cover the 83.5MHz width of the 2.4GHz band. Same with
> >>some really tiny ceramic substrate 2.4GHz antennas. Typically, they
> >>will have about a 3dB gain variation across the band. However, this
> >>is not the case with typical 2dBi vertical coaxial and colinear
> >>antennas which have more than adequate bandwidth. There are also
> >>ceramic bandpass filters on the antenna connection of most access
> >>points and some client adapters to reduce interference from adjacent
> >>services. These are not all that flat across the band and do vary
> >>with production lots. There is also usually a matching network
> >>between the antenna and the PIN diode diversity switch, which can also
> >>be frequency sensitive. In other words, there are plenty of
> >>components that can cause differences in gain across the band.
> >>
> >>For a good clue, search the FCC ID web site for your unspecified model
> >>hardware and look at the test report. You'll see that the transmit
> >>power varies somewhat across the band. The receiver sensitivity does
> >>the same thing, but that's not in the report.
> >
> >
> >
> > I am using a Senoa PCMCIA card with the 2500 something chipset
> > and a 40 inch omni antenna purchased from Pasadena Wireless. It is
> > mounted on the roof with no structures in the way. The signal I am
> > speaking of is a Linksys router WRT54G and when it's on 6 windows
> > says the signal is low. On channel 11 it goes up to good but mostly
> > very good. I may not make sense but I am telling the truth.
> > Thanks for the input.
> >
> Hi,
> Maybe the antenna is tuned to chnnel 11?
The specs didn't say that was the case. Here is the link:
Hmmm... made by "Pasadena Networks LLC" with no supporting data sheet,
patterns or test data. 15dBi in a 40" stick is rather impressive,
especially when the 15dBi Comet antenna needs to be 70" long. Most
40" antennas that I've found are only 10dBi gain. Let's just say I'm
rather suspicious of this antenna.
>It seems to work pretty good compared to rubber duck type I
>have used. Thanks for all of the input.
>
>BTW, what is the best PCMCIA card? Is a 300mw better than my 200?
300mw is only 1.4dB "better" than 200mw. You probably won't even
notice the difference. No comment which card is "best".
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> carleeniet@yazoo.com hath wroth:
>
> >The antenna was advertised as 15db for $66.00.
> >Here is the unit I bought:
> >
> >http://www.wlanparts.com/product/O2415
>
> Hmmm... made by "Pasadena Networks LLC" with no supporting data sheet,
> patterns or test data. 15dBi in a 40" stick is rather impressive,
> especially when the 15dBi Comet antenna needs to be 70" long. Most
> 40" antennas that I've found are only 10dBi gain. Let's just say I'm
> rather suspicious of this antenna.
>
> >It seems to work pretty good compared to rubber duck type I
> >have used. Thanks for all of the input.
> >
> >BTW, what is the best PCMCIA card? Is a 300mw better than my 200?
>
> 300mw is only 1.4dB "better" than 200mw. You probably won't even
> notice the difference. No comment which card is "best".
Do you think the Comet antenna would be better than what I have?
"Jeff Liebermann" <
|
| For a good clue, search the FCC ID web site for your unspecified model
| hardware and look at the test report. You'll see that the transmit
| power varies somewhat across the band. The receiver sensitivity does
| the same thing, but that's not in the report.
Is there a link to where this data can be soursed?
In article <as8753tpl9hh7lie3qkg0b3k4tnsv4ninh@4ax.com>,
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> carleeniet@yazoo.com hath wroth:
>
> >My laptop seems to connect to my Linksys router much stronger when
> >I switch the router to channel 11 from 6. Does this make sense? TIA
>
> Not really. How much stronger? What hardware? External aftermarket
> antennas? Home made antennas?
Don't forget neighbors. What if he's got a neighbor using channel 11?
>Do you think the Comet antenna would be better than what I have?
You might find this comment amusing:
<http://www.fab-corp.com/product.php?productid=489&cat=250&page=1>
Are you comparing this antenna to others online selling a 15dB
omni for considerably less? Note the length of our antenna.
It's 70" long. Collinear designed omni directional antennas
accumulate gain by stacking 13cm segments. There's no way an
antenna 30" less than ours can provide 15dB of gain. So buyer
beware, not all 15dB antennas sold online are equal, some are
actually only 11dB of gain.
I rest my case. You really have a 10dBi antenna with little clue as
to what it really does in the way of gain, vertical radiation angle,
and apparently bandwidth.
Better for what purpose? I'm not a big fan of very high gain omni
antennas. The problem is the vertical radiation angle. The Comet
12dBi omni has a vertical radiation angle of 5 degrees. See data
sheet at:
<http://www.cometantenna.com/products.php?CatID=2&famID=15&childID=24>
<http://www.cometantenna.com/pdfs/gp-24%20spec%20sheet.pdf>
5 degress is very narrow. The 15dBi antenna will probably have a 3
degree vertial beamwidth. If you're lucky, these antennas will also
have a 3-5 degree downtilt, so that you don't end up talking to the
sky (above the horizon). However, that adds length or reduces gain
depending on method used to obtain downtilt.
So, your rooftop 15dBi antenna will talk to anything that's within +
or - 1.5degrees of horizontal. To put that in perspective, if you
mount the antenna on a 20ft roof top, the closest you'll be able to
talk reliably is:
<http://www.terabeam.com/support/calculations/downtilt-cover.php>
0.36 miles or 1900 ft away of no downtilt. For 3 degress beamwidth
and 3 degrees downtilt, it's 0.12 miles. However, your maximum range
is only 0.36 miles which really sucks. Change the downtilt to 2
degress and you maximum range now goes to a not so fabulous 1 mile.
Yech. That's nice for the neighbors, but doesn't do much good for
your own use. It's incredibly sensitive to radiation angle and tilt.
Just draw a 3 degree angle on a piece of paper to see how small it is.
In addition, unless you have very flat terrain, it's going to be
difficult to find a location where you're inside the 3 degree
beamwidth. That's why I think very high gain omni's are a bad idea.
>
>"Jeff Liebermann" <
>|
>| For a good clue, search the FCC ID web site for your unspecified model
>| hardware and look at the test report. You'll see that the transmit
>| power varies somewhat across the band. The receiver sensitivity does
>| the same thing, but that's not in the report.
>
>Is there a link to where this data can be soursed?
Well, he didn't bother answering my questions as to what specific
equipment he was using so I'm not 100% sure I have the correct
hardware. All I know is that it's a WRT54G and a Senao PCMCIA card. I
posted a link to the Senao tx power variation elsewhere in this
thread. Quoting myself:
It also shows up in the test data. See the tx power data for the
Senao 2511 at:
<https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=229884&native_or_pdf=pd f>
in Page 13.
Channel Freq dBm Limit Pass/fail
1 2412 15.48 30 PASS
6 2437 15.00 30 PASS
11 2462 14.11 30 PASS
Note the 1.3dB difference in tx power output between channels 1 and
11. That's not very much, but that's under ideal conditions, without
the resonant effects of the antenna, bandpass filters, matching
networks, receiver, etc. This is also probably a hand tweaked unit.
I'm too lazy to lookup the WRT54G, but I suspect the variations in tx
power will be about the same 1-2 dB. That's not much, but remember
that these are hand tweaked units. Production numbers are
considerably worse.
However, in the OP's case, I don't think the problem is with the
radios (tx or rx). My guess(tm) is that he as a rather narrow band
antenna, which apparently is also lacking in any published
specifications. High gain antennas can just barely squeeze by while
covering the entire 83.5MHz of the 2.4GHz band. Most of the really
high gain units have a marginal 2:1 VSWR at the band edges. Any
variations in tuning caused by nearby metal or production variations,
will cause drastic VSWR changes. The mismatch will also mis-terminate
the ceramic filters inside the unit, which will add their own
variations in VSWR and loss.
Tim Smith <reply_in_group@mouse-potato.com> hath wroth:
>In article <as8753tpl9hh7lie3qkg0b3k4tnsv4ninh@4ax.com>,
> Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
>> carleeniet@yazoo.com hath wroth:
>>
>> >My laptop seems to connect to my Linksys router much stronger when
>> >I switch the router to channel 11 from 6. Does this make sense? TIA
>>
>> Not really. How much stronger? What hardware? External aftermarket
>> antennas? Home made antennas?
>Don't forget neighbors. What if he's got a neighbor using channel 11?
Sure. Someone else mentioned interference. Interference will affect
the noise level, but not the signal strength. However, the OP ignored
my request for numbers and instead supplied the "number of bars" which
could mean anything including signal to noise ratio and bit error
rate, which will certainly be affected by interference.
My experience with interference is that it doesn't stick around. If
the OP had mentioned that it *SOMETIMES* is "stronger" on ch 6 than ch
11, I would certainly suggest interference. He didn't, and my crystal
ball suggests that he's also done some tinkering, which implies that
it's probably a permanent condition. Interference is also position
sensitive. He's using a laptop which in the presence of interference,
will have variations in interference levels. Unless the interference
source is in the same room, methinks that's not the cause.
--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> Tim Smith <reply_in_group@mouse-potato.com> hath wroth:
>
> >In article <as8753tpl9hh7lie3qkg0b3k4tnsv4ninh@4ax.com>,
> > Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> >> carleeniet@yazoo.com hath wroth:
> >>
> >> >My laptop seems to connect to my Linksys router much stronger when
> >> >I switch the router to channel 11 from 6. Does this make sense? TIA
> >>
> >> Not really. How much stronger? What hardware? External aftermarket
> >> antennas? Home made antennas?
>
> >Don't forget neighbors. What if he's got a neighbor using channel 11?
>
> Sure. Someone else mentioned interference. Interference will affect
> the noise level, but not the signal strength. However, the OP ignored
> my request for numbers and instead supplied the "number of bars" which
> could mean anything including signal to noise ratio and bit error
> rate, which will certainly be affected by interference.
>
> My experience with interference is that it doesn't stick around. If
> the OP had mentioned that it *SOMETIMES* is "stronger" on ch 6 than ch
> 11, I would certainly suggest interference. He didn't, and my crystal
> ball suggests that he's also done some tinkering, which implies that
> it's probably a permanent condition. Interference is also position
> sensitive. He's using a laptop which in the presence of interference,
> will have variations in interference levels. Unless the interference
> source is in the same room, methinks that's not the cause.
I just thought of something. What fequency are Uniden 2.4 gig
phones on? I want to stay away from that channel, correct? TIA
>I just thought of something. What fequency are Uniden 2.4 gig
>phones on? I want to stay away from that channel, correct? TIA
Uniden uses 4 different chipsets in their various 2.4GHz phones. Each
one works slightly differently. Some select a specific 1Mhz channel
from among 80 available and use ordinary FM modulation. Some
frequency hop over the entire 2.4GHz band. One uses direct sequence
spread spectrum, but not exactly in the same way as 802.11. The
latest are OFDM. All of them will interfere with your 802.11b/g
wireless because they use exactly the same frequency band going from
2400 to 2483.5MHz. There are also some that use 2.4GHz in one
direction, and 5.8GHz in the other. I think there's also a
2.4GHz/900MHz version, but I haven't seen those lately.
If your Uniden cordless phone uses direct sequence modulation, it's
smart enough to sniff the band for traffic and look for an empty area.
Usually, the cordless phone starts at the bottom of the band.
Therefore, if you put you 802.11b/g wireless on the highest channel
11, you have a fair chance at avoiding the interference. Otherwise,
you lose.
I presume you have a Uniden phone. As with your other wireless
equipment, you seem to have an inability to disclose the exact model
numbers. Probably caused by too much RF exposure. If you want help
with this, you'll need to supply the Uniden model number. If you want
to make it easy for me to do the necessary chipset investigation, also
supply the FCC ID from the serial number tag.
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
> carleeniet@yazoo.com hath wroth:
>
> >I just thought of something. What fequency are Uniden 2.4 gig
> >phones on? I want to stay away from that channel, correct? TIA
>
> Uniden uses 4 different chipsets in their various 2.4GHz phones. Each
> one works slightly differently. Some select a specific 1Mhz channel
> from among 80 available and use ordinary FM modulation. Some
> frequency hop over the entire 2.4GHz band. One uses direct sequence
> spread spectrum, but not exactly in the same way as 802.11. The
> latest are OFDM. All of them will interfere with your 802.11b/g
> wireless because they use exactly the same frequency band going from
> 2400 to 2483.5MHz. There are also some that use 2.4GHz in one
> direction, and 5.8GHz in the other. I think there's also a
> 2.4GHz/900MHz version, but I haven't seen those lately.
>
> If your Uniden cordless phone uses direct sequence modulation, it's
> smart enough to sniff the band for traffic and look for an empty area.
> Usually, the cordless phone starts at the bottom of the band.
> Therefore, if you put you 802.11b/g wireless on the highest channel
> 11, you have a fair chance at avoiding the interference. Otherwise,
> you lose.
>
> I presume you have a Uniden phone. As with your other wireless
> equipment, you seem to have an inability to disclose the exact model
> numbers. Probably caused by too much RF exposure. If you want help
> with this, you'll need to supply the Uniden model number. If you want
> to make it easy for me to do the necessary chipset investigation, also
> supply the FCC ID from the serial number tag.
The reason I didn't mention the model is because I am not sure
because the sticker is old/faded but it looks like it could be
exi3246 and the phones are marked 2.4ghz. Thank you.
Strongest Wireless Channel 
Linear Mode
