900 Mhz phone?

21 Mar 2005 5:53 PM

DotCom

The place I plan to put my wireless router is on a high shelf about 4 feet
above a 900 MHz cordless phone/fax machine. I know that 2.4 GHz phones can
cause problems, but what about 900 MHz phones? Will it cause interference?
TIA
dot

21 Mar 2005 6:27 PM

Rôgêr

DotCom wrote:

> The place I plan to put my wireless router is on a high shelf about 4 feet
> above a 900 MHz cordless phone/fax machine. I know that 2.4 GHz phones can
> cause problems, but what about 900 MHz phones? Will it cause interference?
> TIA
> dot

Not if your router uses a frequency other than 900MHz (which it's 99.99%
probable it does not).

21 Mar 2005 7:06 PM

dold

DotCom <d**@pigtails.com> wrote:

> The place I plan to put my wireless router is on a high shelf about 4 feet
> above a 900 MHz cordless phone/fax machine. I know that 2.4 GHz phones can
> cause problems, but what about 900 MHz phones? Will it cause interference?

My 900 MHZ phone is often about three feet below my router, which was an
SMC 802.11b, and is now a Netgear 802.11b/g. The phone is very often
within a foot or tow of my laptop. No interference that I've noticed.

I do get some "blips" if the phone is too close to my PC external speakers.

--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5

22 Mar 2005 1:32 AM

Rôgêr

d***@XReXX900XM.usenet.us.com wrote:

> DotCom <d**@pigtails.com> wrote:
>
>>The place I plan to put my wireless router is on a high shelf about 4 feet
>>above a 900 MHz cordless phone/fax machine. I know that 2.4 GHz phones can
>>cause problems, but what about 900 MHz phones? Will it cause interference?
>
>
> My 900 MHZ phone is often about three feet below my router, which was an
> SMC 802.11b, and is now a Netgear 802.11b/g. The phone is very often
> within a foot or tow of my laptop. No interference that I've noticed.

Just curious, maybe you or someone else can elaborate. I've got a set of
5.8GHz phones that had 5.8GHz printed in big letters on the box, lost
somewhere in the fine print was something about "mixes the best of 5.8
and 2.4GHz". I've seen mentioned something about this type of phone
receiving on one frequency and sending on another, is that close to the
skinny? How likely would it be for one of these handsets to interfere
with a 2.4 AP? Also mentioned on the box was frequency hopping but did
not explain in any detail. If these really are FH then I suppose the
power levels aren't enough to worry about regarding the AP.

22 Mar 2005 7:12 AM

Jeff Liebermann

On Mon, 21 Mar 2005 20:32:49 -0500, Rôgêr <ab***@your.isp.com> wrote:

>Just curious, maybe you or someone else can elaborate. I've got a set of
>5.8GHz phones that had 5.8GHz printed in big letters on the box, lost
>somewhere in the fine print was something about "mixes the best of 5.8
>and 2.4GHz". I've seen mentioned something about this type of phone
>receiving on one frequency and sending on another, is that close to the
>skinny? How likely would it be for one of these handsets to interfere
>with a 2.4 AP? Also mentioned on the box was frequency hopping but did
>not explain in any detail. If these really are FH then I suppose the
>power levels aren't enough to worry about regarding the AP.

Just use the FCCID to lookup the technology used on the FCC web pile
at:
http://www.fcc.gov/oet/fccid/
It's so much cheaper to get full duplex from cross band operation than
to build a handset that does full duplex in a single band.

Frequency hoppers absolutly trash direct sequence spread spectrum
radios. I don't recall if the handset or the base transmits on
2.4Ghz. I think it's the base, but I'm not sure.

As for the power level, inverse square law claims that proximity of
the devices has more to do with interference than power output. As I
recall, the tx power out for the phone base runs about +10dBm but into
a truely horrible 1/4 wave antenna.

Drivel: I just notice that Google has a search by FCC ID under
"search by number".
http://www.google.com/help/features.html#number
Works nice. Hit the first link it finds near the top of the page.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# je***@comix.santa-cruz.ca.us
# je***@cruzio.com AE6KS